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Playing politics with an ally
Daniel R. Suhr | A Democratic tactic for the midterm elections puts Israeli security at risk
SEC Football Power Rankings Week 4
With a crazy week three for college football, here is how the power rankings look for the SEC.
Jalen Carter injury scare in Eagles-Titans Week 2 game
The Eagles DT went down after trying to block a field goal late in the game, but thankfully, it was just some cramping.
Ben Arbuckle coaching for his job moving forward, other developments from OU-New Mexico
OU scraped by against New Mexico at home in a 14-6 win at Gaylord Family-Oklahoma Memorial Stadium on Saturday.
North Bay firms urge Newsom to sign website privacy lawsuit reform bill
Contractors in Sonoma, Marin and Solano counties are among thousands of California small businesses who say website privacy lawsuits are costing them dearly as CIPA litigation reform bill SB 690 awaits Governor Newsom’s action.
David Jolly declines election debates against Byron Donalds
MIAMI, Fla. (WINK) — Former U.S. Rep. David Jolly, the Democratic nominee for Florida Governor, announced he will not debate Republican nominee Byron Donalds in the general election.Jolly released a
David Jolly declines to debate Byron Donalds in Fort Myers race
MIAMI, Fla. (WINK) — Former U.S. Rep. David Jolly, the Democratic nominee for Florida Governor, announced he will not debate Republican nominee Byron Donalds in the general election.Jolly released a
When Ebola Strikes, HIV Care Cannot Stop
As the Democratic Republic of the Congo (DRC) confronts its 17th and fastest-growing Ebola outbreak, a troubling warning is emerging from community networks
Incumbent, political newcomer to face off in race for Texas House District 91
Republican David Lowe and Democrat Yisak Worku are running to represent the northeast Tarrant district.
Ebola outbreak update: Cases and deaths; Dungu health zone, Haut-Uélé province now affected
A total of 73 new confirmed cases of Ebola Virus Disease (EVD) were reported on September 18, 2026, including 25 community deaths. Of these confirmed cases, 46 were from Ituri province, 18 from North Kivu, 6 from Haut-Uélé, and 3 from Tshopo. A new health zone, Dungu, in Haut-Uélé province, was affected during the day. As this zone borders South Sudan, strengthening cross-border surveillance is necessary. During the day on September 18, 2026, 12 deaths within Ebola Treatment Centers (ETCs)—10 in Ituri and 2 in North Kivu—were unfortunately recorded, bringing the total number of deaths for the day to 37. However, 41 patients were declared recovered (30 in Ituri, 6 in Haut-Uélé, 3 in North Kivu, and 2 in Tshopo) after testing negative for EVD twice. Since the start of the epidemic in the Democratic Republic of the Congo (DRC), a cumulative total of 7,614 confirmed cases, including 3,676 deaths, has been recorded, representing a case fatality rate of 48.3%. The epicenter remains Ituri province, which accounts for 77.2% of the confirmed cases reported across the seven affected provinces and also accounts for 63.0% of the new confirmed cases. A new health zone was affected on September 18, 2026. Consequently, 63 out of 167 health zones (37.7%) across 7 provinces are affected. Subscribe to Outbreak News TV on YouTube Response measures feature 97% traveler screening at entry points, surveillance expansion to new area Dungu, and community outreach sensitizing over 110,000 people in one day. The Democratic Republic of the Congo’s health system faces deep, structural constraints that predate the current Ebola outbreak and make epidemic response far harder. These problems are most acute in rural areas and the conflict-affected east. Outbreak News Today is a reader-supported publication. To receive new posts and support my work, consider becoming a free or paid subscriber. Subscribe Eastern provinces have seen health facilities damaged, looted, or abandoned. Insecurity delays patients, blocks supply deliveries, and exposes staff to attacks. Millions of displaced people live in camps with poor water, sanitation, and health services, increasing outbreak risk. Vast distances and poor roads mean many people walk hours or days to reach care. These same weaknesses explain why Ebola has continued to spread into new, under-prepared health zones even as some original hotspots show improvement: surveillance, laboratory turnaround, contact tracing, and infection control remain thin outside the best-supported sites. The Ministry of Health and partners have scaled up treatment centres, laboratories, and vaccination in the current outbreak, and some digital surveillance systems (DHIS2) provide a useful backbone. However, the underlying gaps in staffing, basic infrastructure, reliable funding, and logistics have not been closed. Without sustained investment in those foundations, the system will remain vulnerable to both routine disease burden and the next large outbreak. If you like the reporting on Outbreak News Today, please consider a paid subscription for $5/month or $30 a year. Help support the cause of this niche journalism. It is appreciated.
Mario Craver asked for more touches and delivered against Kentucky
Craver caught a career-high 11 passes for 119 yards as injuries depleted the Aggies' offensive backfield and receiving corps.
Tennessee Democrat to propose bill to ban corporations from political spending
A Tennessee Democrat is set to push for new restrictions on corporate campaign spending, following the seminal steps of a movement to limit dark money in politics.
Abdul-El Sayed, a Democrat, Has an Unlikely Defender: Tucker Carlson
Mr. Carlson, the far-right podcaster, has promoted Dr. El-Sayed’s comments and sharply criticized his Republican rival in a key Senate race. Strategists are scratching their heads.
Late Cunha equaliser denies Fulham first win of the season
Matheus Cunha’s late deflected equaliser rescued a point for Manchester United and denied Fulham a first Premier League victory of the season at Craven Cottage.The first half produced 26 shots but n...
Why politicians should pay more attention to the polls (reprise)
Welcome to the 231st edition of The Week in Polls (TWIP), a polling newsletter that always welcomes new readers. So please don’t keep TWIP a secret; share it with your friends and colleagues: Share The Week in Polls With all the stories swirling around Reform, JL Partners and political polling, I am finally tearing myself away from talking about the regulation of polling this week - and instead re-running a previous piece reminding us why the solution to problems with polls isn’t simply to ban or ignore them. Rather, we need them to play a vital role in making our politics - and politicians - better. This is followed by summaries of the latest national voting intention polls, seat projections from MRPs and the most recent party leader ratings. Subscribers who pay for the full edition can also read ten insights from the latest polls and analyses, including: A trio of organisations and a pair of professors have been casting their eyes over the Liberal Democrats ahead of the party’s autumn conference; What impact did the summer heatwave have on views on climate change? and Which wins out between chocolate and cheese? If you are not yet a paid subscriber, you can read all ten by starting a free trial now: Get FREE 7-day trial For more polling news as it comes in ahead of next week’s edition, you can also follow The Week in Polls on Bluesky. Picking up on my doubt last week about whether or not 35% of British train travellers have tried to order a takeaway for delivery to a railway station or carriage, thank you to reader Iain, who has been in touch to say he has done just that… in India. Another quick pair of updates, this time on the controversies around Reform and polling. Politico has a further scoop - “Farage aide caught in donor sting attended Egypt retreat with JL Partners” - and Ian Dunt has written about the problems with polling too: “Seeing the response of many polling experts in the last few weeks suggests that they are nervous about what is happening and keen to mitigate against it. Seeing the response of journalists, which has been basically non-existent, suggests the precise opposite.” My usual reminder as well: please do hit reply if you’ve spotted a poll, focus group or new piece of poll-based research that you think should be in contention for coverage in a future edition. Thank you! And with that, on with the show. How politicians get public opinion wrong I have written before about the benefits that come from widespread availability of high-quality political polling. We need more polls and more good coverage of polls. However, what I’ve not dug into before is the research into how accurately politicians estimate public opinion on issues. Thankfully we have academic research to tell us. First, the bad news: We present results from a study of 866 politicians in four countries.1 Politicians were asked to estimate the percentage of public support for various policy proposals. Comparing more than 10,000 estimations with actual levels of public support, we conclude that politicians are quite inaccurate estimators of people’s preferences. They make large errors and even regularly misperceive what a majority of the voters wants. Politicians are hardly better at estimating public preferences than ordinary citizens. Walgrave, S., Jansen, A., Sevenans, J., Soontjens, K., Pilet, J.B., Brack, N., Varone, F., Helfer, L., Vliegenthart, R., van der Meer, T., Breunig, C., Bailer, S., Sheffer, L. & Loewen, P.J. (2023a), “Inaccurate Politicians: Elected Representatives’ Estimations of Public Opinion in Four Countries”, The Journal of Politics, 85(1): 209-222. The bad news is not quite as bad as that makes it sound because, when asked whether the majority of public opinion was for or against various policies, politicians picked the wrong option ‘only’ 29% of the time. However, this included getting it wrong even when public opinion is far from evenly split on an issue: They do not only get it wrong when the public is divided and hard to read (e.g., when there is a 51%:49% distribution). Seventy percent of the misplacements occur for policies with a relatively clear distribution of at least 60% (dis)agreeing citizens. Moreover, the public scored only slightly worse than politicians, picking the wrong option 2.7 out of 8 times on average, compared with 2.3 times for politicians. Turning to the other measure of accuracy (not which side is in the lead but what the percentage support is for each side), politicians on average were 18 percentage points out in their guesses. Again, this was only slightly better than the public, whose error came in at 21 percentage points.2 Further research, using the same mix of countries, gives a little more comfort about how (in)accurate perceptions are: We show that politicians have a better understanding of public opinion when they think the issue matters to voters. Further, when an issue is personally important to politicians they more accurately estimate their party supporters’ opinions. The results confirm that politicians hold more accurate perceptions of voters’ preferences when they think it is important to do so but not necessarily when the issues actually are important to voters. Butler, C., Walgrave, S., Soontjens, K. & Loewen, P.J. (2024), “Politicians are better at estimating public opinion when they think it is more salient”, Party Politics: 1–13. Even so, it’s not a good picture. The remedy for this? Politicians should spend more time reading the polls. So forward this newsletter to someone you know… Share For a more general argument against banning polls, see my 2024 piece. Is “Let Bartlet Be Bartlet” good advice or not? The latest episode of my Political Fictions podcast heads across the Atlantic for a dip into one of the political TV classics: Mark and Cory talk about a giant of American political drama for the first time this week, as they tackle The West Wing. They talk about Let Bartlet Be Bartlet, the nineteenth episode of series one. In it, Mark wonders if The West Wing is actually the epitome of the “Boris Johnson school of politics”, Cory outmanoeuvres Mark into confirming we will record a Christmas Special about Love, Actually and they debate whether the central message of this episode has been misunderstood. Cory’s email newsletter is Paperback Rioter and Mark has a family of email newsletters. Subscribe to our newsletter for some additional bonus content and to get alerted whenever a new episode comes out. Our theme tune is “Monkeys Spinning Monkeys” by Kevin MacLeod/incompetech.com and licensed under the Creative Commons: By Attribution 4.0 License. You can also listen to our episode on Apple Podcasts, Spotify, the web or YouTube. Elsewhere from me… [ A Lord's Eye View How to fix the problem of money in our politics Welcome to my latest update on work in the House of Lords. This time I am taking a look at how our political system is regulated, and the protections we need to keep democracy safe from becoming simply a contest to see who has the biggest bank account… Read more 5 days ago · 3 likes · 2 comments · Mark Pack ](https://lordseyeview.substack.com/p/how-to-fix-the-problem-of-money-in?utm_source=substack&utm_campaign=post_embed&utm_medium=web&embedding_publication_id=1269283) If you spot a factual error… Borrowing an idea from Stuart Ritchie and others, if you spot a factual error in an edition of this newsletter, I will give you a free 12-month subscription to the paid-for version (or an extra 12 months on your existing one). Factual errors qualify, but grammatical errors or disagreements over interpretation do not, and my decision is final. Messages about both of those are always welcome, though. Voting intention and leadership ratings Here are the latest voting intention polls from different pollsters. It is all pretty static at the moment, with a small and consistent Labour lead in nearly all the polls. The table is also online here, along with explanations about what is included. It is updated regularly throughout the week as new polls are released. Next are the seat projections from MRPs, also sorted by fieldwork dates, listing those which are based on dedicated fieldwork (rather than models based on averages of other polls). Because such MRPs are published infrequently, some of the entries below are quite old. Finally, here is a summary of leadership ratings, with a graph from PollCheck: Detailed numbers from the latest polls are online here, and both that and the graph are updated regularly throughout the week as new data comes out. For historical figures on both voting intention and leader approval stretching back to the 1930s, including Parliamentary by-election polls, see PollBase. Catch up on the previous two editions [ ](https://theweekinpolls.substack.com/p/a-crisis-point-for-political-polling) [ A crisis point for political polling Sep 13 ](https://theweekinpolls.substack.com/p/a-crisis-point-for-political-polling) [ Read full story ](https://theweekinpolls.substack.com/p/a-crisis-point-for-political-polling) [ ](https://theweekinpolls.substack.com/p/extra-questions-about-the-polls-in) [ Extra questions about the polls in Reform’s funding scandal Sep 6 ](https://theweekinpolls.substack.com/p/extra-questions-about-the-polls-in) [ Read full story ](https://theweekinpolls.substack.com/p/extra-questions-about-the-polls-in) My privacy policy and other legal information are available here. Links to purchase books or other items are usually affiliate links which pay a commission for each sale. Quotes from social media messages are occasionally lightly edited for punctuation and clarity. If you are subscribed to other email lists of mine, please note that unsubscribing from this one will not automatically remove you from the others. If you wish to be removed from all my lists, simply reply to this email to let me know. A quintet of Lib Dem polling analyses, and 9 other polling insights you shouldn’t miss The following ten findings from the most recent polls and analyses are only for subscribers who pay for the full edition, but you can sign up for a free trial to read them straight away. Ahead of the start of Liberal Democrat conference, we have a trio of organisations and a pair of professors with pieces out about Ed Davey’s party:
Minecraft Takes Science to a New Level: A Fly’s Brain Was Transplanted Into the Video Game
The experiment demonstrated the potential of gaming as a tool for testing consciousness in a virtual environment.
Political Beat Preview: House District 98
Incumbent Democrat Beth Helfrich is seeking re-election and facing a challenge from former Republican representative John Rhodes in North Carolina’s 98th House district that covers the northern part of Mecklenburg County.
Capitol View: Political roundtable, economist Mervin Jebaraj
LITTLE ROCK, Ark. – How are the races in the state legislature shaping up? Capitol View host Roby Brock met with Democratic strategist Michael Cook and Republican strategist Grant Hodges to talk about...
Crash-and-grab burglars target NW Side business, Chicago police say
Chicago police are investigating after burglars crashed into a Northwest Side business on Sunday morning.
Live updates: Manchester United vs Fulham at Craven Cottage
Manchester United need to return to winning ways when they take on Fulham at Craven Cottage on Sunday.Michael Carrick is under pressure and only a win will do before heading into the international bre...
Barbara Crampton Will Face THE KENTUCKY GOBLINS In New Festive Found-Footage Creature Feature
She's taken on zombies, killer robots, cursed puppets, and a whole lot more, but now genre icon and Fango fave Barbara Crampton will face her trickiest foe yet with a starring role in The Kentucky Gob...
Here's why Apple scrapped its shorter Apple Pencil designed for iPhone Duo: report
Leading into the iPhone Duo launch, we heard from Bloomberg’s Mark Gurman that Apple was considering a new Apple Pencil...
Shaheen says funding healthcare is not 'an issue of resources'
Answering a voter’s question, Democratic 1st District congressional candidate Stefany Shaheen said she believes Medicare for All is the best way to make health care affordable. She said the federal government should focus its efforts on making the policy a reality.
Optimism and tight polls: Can Florida Democrats flip Sunshine State blue in 2026?
Florida Democrats gathered in Miami with renewed hope as tight polls signal potential turnarounds in key 2026 midterm races.
Power & Politics: Suffolk Democrats gear up for convention, local elections
Democratic Party Chairman Rich Schaffer and Southold Town Democratic Committee Chair Katherine Casey Quigley join the show.
Blizzard developer says World of Warcraft: Forever's beta numbers are the "craziest" he's seen in 17 years
World of Warcraft: Forever's beta was overwhelmed by players this week, with a Blizzard developer calling the numbers the biggest he's seen in 17 years.
Poll: Most voters say Trump has hurt the economy as competitive midterm election looms
Trump’s approval and economic ratings point to a gloomy environment for the GOP, but the race for Congress is closer than in his first midterm, with the Democratic Party still unpopular.
Startup JetZero is building a sleek new kind of plane with bigger-than-Boeing dreams
A startup is building a new type of passenger plane to rival Boeing and Airbus' tube-and-wing models. The blended wing body aircraft could take flight next year.
A bitter battle is brewing in one of Washington state’s last swing districts
Democrats are looking to scoop up more legislative seats this November in Battle Ground and other chunks of Southwestern Washington as they edge toward a supermajority in Olympia — a shift that would give them broad power to pass legislation or redraw the state’s voting maps.
Yankees’ ace just crashed the Cy Young race
The Yankees got walked off in Phoenix on Friday. Cam Schlittler was not the reason why. He gave them six […]
KCCI's full one-on-one interview with Democratic governor candidate Rob Sand
How would Rob Sand govern Iowa? Democratic nominee gets specific on key proposals
As states crack down on sweepstakes casinos, VGW makes $351,000 play into Alabama politics
An Australian sweepstakes casino has contributed $351,000 to Alabama politicians and political groups as other states move to ban or restrict the industry.
Russia-Ukraine war creates new voting bloc in Israel as immigrants find their political voice
More than 102,000 immigrants from Russia and Ukraine since the 2022 invasion are eligible to vote in the October 27 election; several tell ynet that democratic institutions, minority rights, regional investment and immigrant integration are shaping their priorities
Leftists make waves and Trump flexes muscles: US primary season takeaways
Candidates have been selected for November’s midterms – have Republicans and Democrats made the right choices?
Can Democrats flip House seat in SC? Navy official fired by Hegseth faces Charleston councilwoman.
Democrats think they have a shot at picking up South Carolina’s 1st Congressional District in the Lowcountry after two straight thumpings from retiring U.S. Rep. Nancy Mace.
Lib Democrats fight for a breakthrough in Britain’s fractured politics
Britain’s Liberal Democratic Party is holding its annual conference in Brighton this weekend.
One game later, Bills' new stadium finally feels like home
Thousands filled the new Highmark Stadium for the Buffalo Bills' home opener on Thursday, Sept. 17.
‘Skyrocketing’ diesel prices impacting area businesses
The average price of diesel fuel in the Scranton/Wilkes-Barre/Hazleton market rose to $6.52 as of Thursday — up about $2.50 from last year and nearing the record high of $6.62 set in May 2022.
Mitchell’s Kings Tenure Prepared Him for Starting PG Role
Mitchell reflects on his time in Sacramento and how it turned him into the point guard he is now.
Republicans find transgender issues a powerful political weapon in midterm campaigning
He's unpopular, his war is going badly and the US economy is strained.Axios reported that Elon Musk's "America PAC" has begun an ad blitz attacking Democrats over their unpopular transgender positions...
California Cracks Down on Influencers’ Undisclosed Political Ads
Under a new law, creators could face fines of $5,000 per post if they don’t disclose that they were paid to make political content.
WATCH LIVE: Pete Buttigieg keynotes Texas Democrats Johnson-Jordan Dinner
Former Transportation Secretary Pete Buttigieg delivers the keynote address at the Texas Democratic Party’s 12th Annual Johnson-Jordan Dinner as Democrats rally ahead of midterms.
Trump Faced Loss After Loss. He Then Turned to a Familiar Target: The Press.
The president’s ban of three media outlets from the White House fits a pattern of using the apparatus of government to crack down on his perceived enemies.
News Outlets Express Solidarity After Trump Bars Some Reporters
Some Democrats said President Trump’s ban was an attempt to control the press and distract voters as Republicans face deep challenges in the midterm elections.
Georgia Tech Cracked The Code At Southern Showcase
Georgia Tech's cross country squads dominated the Southern Showcase with a historic men's finish and multiple personal bests. See the full breakdown.
Michigan’s two major party candidates for U.S. Senate offer differing ideas for health care
Republican Mike Rogers rolls out plan heavy on transparency; Democrat Abdul El-Sayed advocates for Medicare for All
Recap: Boston College scrapes by Maine, 22-16
On Saturday afternoon, the Boston College football team faced off against the Maine Black Bears at Alumni Stadium for Week 3 of the 2026 regular season. The first possession already showed some fireworks when Boston College recovered a Maine fumble on the opening kickoff. But BC failed on their 4th down conversion in the first […]
Kings G LaVine Setting 'Extremely High' Standards
The Sacramento Kings' injury bug was major last season, with multiple key contributors suffering severe injuries. After returning to full health, Zach LaVine is one player looking to bounce back.
Scientists Discover New Crater on the Moon, Bigger Than the Roman Colosseum, That Was Created in a ‘Once-in-a-Lifetime’ Impact
Scientists have discovered a new moon crater bigger than the Roman Colosseum, formed in 2024 by a rare impact that also changed nearby lunar surface conditions.
Michael Carrick Must Not Make Same Mistake vs Fulham
Manchester United travel to Craven Cottage needing all three points to avoid an awful start to the season.
Serie A: Roma and Inter Milan in a crazy draw!
A crazy top-of-the-table clash!On Saturday night, the showdown between AS Roma and Inter Milan gave us a completely wild 2-2 draw.Perfectly set on their way by a goal from Manu Koné in the sixth minu...
Democrats call for investigation into faulty AI-generated intel report
A group of top Democratic senators is calling on government watchdogs to investigate a series of mistakes in US military targeting plans caused by artificial intelligence, after a CNN report detailed how one such error, according to a source familiar with the incident, “almost started a war.”
Sacramento Kings Position Primer: Shooting Guard
Taking a look at the shooting guard position for the Sacramento Kings ahead of the 2026 NBA season.
Fulham vs Manchester United predictions: Premier League tips and odds
Both Fulham and Manchester United are already under pressure this season ahead of their meeting at Craven Cottage on Sunday (kick-off, 4.30pm), in the final Premier League fixture before the international break.
Sacramento Kings Position Primer: Point Guard
Taking a look at the point guard position for the Sacramento Kings heading into the 2026 NBA season.
‘It will never be the same’: How Trump turned on the Kennedy Center and brought it to its knees
Nine months from the day when cranes first placed Trump’s name on the marble façade, the institution has been brought to the brink
Scientists Discover New Crater on the Moon, Bigger Than the Roman Colosseum, That Was Created in a ‘Once-in-a-Lifetime’ Impact
Scientists believe the crater was caused by a space fragment the size of a three- to six-story building
Democratic Gov. Katie Hobbs leans into a GOP-friendly message in battleground Arizona
Even as the political environment favors her party, Hobbs is focused on the middle as she seeks a second term in a state Trump won in 2024.
The Big Holes in Wearable Heart Rate Variability And Readiness Scores
On September 9th, Apple announced it was revamping its Apple Watch Health Sensing System, rolling out a Readiness score (0 to 10), and increasing the frequency of heart rate variability (HRV) outputs 24-fold. This can be viewed as upping its competition with various other consumer wearable sensors. These “readiness scores” as a composite of multiple metrics, with heart rate variability (HRV) being front and center for most. The majority of Americans are now using wearable sensors, which equates to well over 100 million adults. HRV and Readiness scores are increasingly being marketed as a measurement of autonomic nervous system health, a digital marker for future disease, a clock for biological age, and a holistic metric to promote healthspan and even longevity. (Apple also introduced a new longevity tab and “Health Age”.) None of this has been proven. In this edition of Ground Truths I am going to review what we know about heart rate variability and readiness scores. Heart Rate Variability HRV is the variation in normal heart cycle timing. The variability of the heart rate, the barely perceptible millisecond changes in time between consecutive heart beats (see R-R intervals in the Figure below, left panel), is due to interplay between the sympathetic and parasympathetic (vagal nerve) inputs. Distinct from heart rate, individuals with the same heart rate can have very different HRVs. It is a rough reflection of the autonomic nervous system (ANS) activity, inadequate to say whether a person’s ANS function is abnormal. For more than three decades, heart rate variability (HRV) has been measured and several studies have found an association of low HRV and clinical outcomes, particularly a link with higher all-cause and cardiovascular mortality. There have also been less well established links of low HRV to risk of early cognitive impairment, dementia, mental illness, Type 2 diabetes and substance abuse. An important reminder is that HRV is a surrogate marker without any established cause-and-effect relationship. If you increase your HRV, that doesn’t mean it will improve health outcomes. In fact, there is no hard evidence for that. All that work linking to health outcomes was done with electrocardiogram (ECG) derived HRV. Now, in the era of consumer wearables, this is getting assessed differently, by optical pulse (yes, the lights you see) plethysmography (PPG) or what is called pulse rate variability (PRV). They are not the same, as shown below (right panel) and only concordant when the delay between the ECG and pulse is kept constant, which basically means at rest. I should mention there’s also what I will call MPV, a mattress mechanical movement sensor, a derived heart rate variability, that companies like Eight Sleep use, even further away from directly measuring HRV. HRV has not one uniform measurement but many different types of quantification, such as RMSSD, the magnitude of difference between successive R-R intervals of normal sinus beats (N-N) or SDNN, the standard deviation of NN intervals, both in milliseconds. SDNN is one of the so-called frequency domain HRVs (others are LF, HF, LF/HF). Different wearable sensors use different metics; Apple has relied on SDNN and nearly all of the others use RMSSD, which is generally considered the more accurate metric. There’s also the different length of time measured, such as for a matter of minutes, all day, or an overnight’s sleep. Short measurements are especially problematic since they don’t capture enough of respiratory modulation and other factors that influence HRV. Share Ground Truths How well does HRV correlate with PRV? There are very limited studies, especially independently done. One that is commonly cited was conducted by Air Force researchers in only 13 healthy adults assessing Oura ring 3 and 4, Whoop 4.0, and Garmin Fenix 6 and showed a correlation coefficient of 0.88 to 0.97 and a mean absolute percentage error from 6 to 10%. The correlation is not a perfect 1.0, but there’s at least a fairly high level of correlation. HRV is supposed to increase during the night due to takeover of the parasympathetic nervous system, and higher during deep sleep. A recent example of my 1 week, all day “HRV,” and one during sleep is shown below. As you can see, the N of 1 data are inconsistent for the same days from different sensors (Oura, AppleWatch, Fitbit Air, and Eight Sleep) by patterns, absolute numbers, and comparison with prior days and weeks. The largest study in over 8 million Fitbit users (the old version, not Google Fitbit Air, introduced in May 2026) gives you a sense of the effect of age, sex, and the 2 different main HRV (here PRV) metrics, with RMSSD on the left and SDRR (=SDNN) on the right below. That study, from data collected in 2018, is a major outlier, since all the more recent ones are tiny with respect to sample size. Many of the companies have not had independent evaluation of their HRV, such as Eight Sleep, but have published a low standard error on their website. There are some other published studies on the correlation between HRV and PRV, but they are all small and only in healthy adults. A scoping review emphasized the lack of study in underrepresented individuals, including the aged, people of color (which affects the PPG signal), and individuals who are underweight or obese. Add the typical adult age 60 plus with one or more chronic diseases. For example, one study in over 900 adults found poor correlation of HRV and PRV, non-uniformly underestimated across many chronic diseases (cardiovascular, endocrine, neurological, respiratory, and others), concluding PRV is “an invalid surrogate for HRV.” A recent systematic review of 43 studies comparing HRV and PRV found reasonable pooled absolute standardized error (HRV as gold standard) but only 10 of the studies provided quantitative synthesis in ideal conditions. Their main conclusion was similarly cautious: “PPG-derived HRV [PRV] should not be regarded as universally interchangeable with ECG-derived HRV across all devices, populations, and recording contexts.” Factors Affecting HRV and PRV That gets me to the long list of factors that affect HRV (and PRV) besides the device, the type of measurement (RMSSD, SDNN or others), the person’s signal, the sensor site, the duration of data capture, if weighting by sleep stage is used, how artifact is processed and corrected. And this list is not complete!: Oura puts out data from their community of users (who input data) on what affects their overnight HRV. The factors currently provided are: no alcohol (increase 8%), melatonin (increase 2%, float tank (increase 2%), wine (decrease 4%), and party (decrease 14%) in overnight HRV. Must be some big parties! Subscribe What is a PRV measurement good for? It has been falsely characterized as an index of “autonomic balance” and a specific indicator of stress. A 2018 review of the studies available for HRV and its relationship to stress, not using any of the current wearables, found that stress can lower HRV. But so can many other factors. The non-specificity of the signal, indexed to the table above, is striking. Evidence from a UK Biobank study of over 46,000 participants with actual HRV looked at genetically predicted HRV, a genetic risk score, that failed to show the expected HRV-mortality link, indicating that _HRV is likely not causa_l, but rather a reflection of person’s physiologic state. A review of consumer wearable HRV data from 5 longitudinal studies showed that nighttime PRV was not associated with perceived stress, and surprisingly higher HRV, in the largest cohort (N=717 participants), was correlated with higher stress. An Oura ring cohort of 525 first-year college students found a link between overnight PRV and perceived stress, but that was also seen with resting heart rate, sleep, and respiratory rate. Several very small studies have examined the relationship of HRV and athletic injuries or guiding training with mixed, and predominantly negative results. HRV biofeedback training with paced breathing had no significant effect on reducing stress or raising HRV, as demonstrated with sham controlled trials. When HRV for multiple days showed a decline in conjunction with body temperature, the Oura ring published data for prediction of Covid. The WHOOP company sponsored an observational study, published in 2026, of 30,000 users for 72 weeks, without a control group, that reported reduced alcohol intake (5.8 % points) by self-report. That doesn’t tell us much, and particularly about the merits of HRV for behavioral change. If you use the same device and conditions as longitudinal trends for multiple (at least 2-3) weeks that may be the one way to get something useful from the measurements. Data for overnight sleep with minimal motion and using RMSSD is the best proxy for real HRV. The reason to look at trends rather than any given night is that it more likely represents something, even though you won’t know with certainty what the “it” is. Keep in mind there are no data, no peer-reviewed evidence, to show that HRV fluctuation in-person has any correlation with health outcomes. Share Readiness Scores These are proprietary scores that integrate different metrics for each of the wearables: no algorithms have been disclosed. They are unvalidated against health outcomes. In a review of 14 composite health scores of readiness and recovery, HRV contributed 86% to the scores, followed by reading heart rate (79%), physical activity and sleep duration (both at 71%). That review noted the substantial variability in measurement protools and lack of standardization. Sleep staging is notoriously inconsistent and inaccurate by these sensors, which adds further to the HRV uncertainties for what the scores, which use sleep stage data, mean. Only resting heart rate has been shown consistently across devices to be extremely accurate. I’ve made a Table to summarize what we know about which metrics are included, the scores, any peer-reviewed studies that compared the readiness score with health outcomes, and the corresponding (if any, NA-not available) citation. You will note that some companies do not use the term “readiness," such as WHOOP for recovery, and Garmin, which has 2 different scores, one of which is Body Battery. Eight Sleep uses the term “Fitness Score.” They all include HRV; Apple includes a new metric they call “Recovery HRV” which among other components uses 7-days of sleep, but it is unclear what this means or how it is differentiated from other scores (there are clearly no data for outcomes). We have no knowledge of how the different components are weighted or whether any of these scores are better than resting heart rate, HRV alone, physical activity, or any other single metric. Since none of these are standardized, they are not interchangeable, so if you get a 90 for Oura that has no relationship to a 90 on a Google Fitbit Air. Notably, the company can update its algorithm for readiness score at any point without notification to device users. Without any useful evidence of actionability for these scores or established relationship with health outcomes, it is hard to make a case for their value. At the Apple recent announcement they showed their Readiness score (0-10) on the watch (Figure below) but there are no published data on this score, not even on their website. It’s available only on their new Watch Series 12 or Ultra 4 [of course, ;-)]. That exemplifies the problems with these scores, lack of data and evidence for being meaningful to promote health. Perhaps the best study (which isn’t saying much) is the WHOOP Recovery for golfer performance, because it did correlate with an objective outcome, even though there was no control group and the authors were all from the company. Among the 389 pro golfers, an absolute 10-per cent point increase in Recovery score was associated with about 0.5 fewer strokes per round. But that’s hardly a health outcome! WHOOP is also conducting a study in over 2,700 runners to see if their recovery score will be linked to less injuries and improved performance, but that is not yet published and has no control group or randomization. Putting This in Context For two decades I’ve been enthusiastic about the potential for digital health and particularly wearable biosensors. Over the years, we’ve seen some great progress for their ability to promote physical activity and accurately detect atrial fibrillation (the first FDA cleared deep learning AI for consumers). That work was the subject of rigorous research. But there are holes in the data and evidence for other metrics. One notable one is the “VO2 max” story that I wrote about earlier this year. At that time many subscribers asked me to cover heart rate variability, which I finally got to here. When I dived into the research and publication for HRV and readiness scores, I expected to find at least some that were of high quality and demonstrated their utility by linkage to health outcomes. To my surprise, I found none. The wearable sensor measurements for HRV (PRV) are, for the most part, accurate, but that validation work has only been done in small studies of healthy adults and does not take into account the long list of factors, from the device, software side, and the user side, that affect HRV measurements. Moreover, this metric chiefly relies on optical sensing and, as we have learned for heart rate PPG sensing, may be less accurate in people of color. Keep in mind that all of the health outcome association evidence comes from ECG-derived HRV; none are from wearable sensor data. I will repeat the key point: there's no peer-reviewed evidence to show that in-person HRV fluctuation—or efforts to raise your HRV— has any correlation with health outcomes. For those of you who look at your HRV on awakening, or even 2+ week trends of it being low, I hope this context helps to relieve any anxiety. Yes, low HRV (not PRV) has been shown to increase risk of some diseases as summarized above. But efforts to raise your HRV—a surrogate metric— has not been established for improving any health outcomes. HRV does not have any evidence of causality (the genetic evidence actually goes against this possibility). In this summary, I have not included data for other wearable sensors such as Polar, Samsung, Withings, Suunto, Amazfit, Coros, Ultrahuman, or additional mattress sensors. These are beyond my first-hand experience, and as far as I know from my in-depth review none have any peer-reviewed published data that differ from the 6 sensors I’ve reviewed here. From the points I’ve gone over above, we’re not ready for readiness scores. Besides being proprietary, they are predominantly based on metrics that have their own issues. It’s compounding the problem, like building a house without a solid foundation that has never undergone a rigorous inspection, and then selling it. Like I mentioned for PRV, you can look at trends over weeks rather than any single day, to get a handle, but even that may not be helpful. There’s simply no evidence that these scores meaningfully relate to health outcomes. I’d emphasize they might, but that requires doing prospective or randomized studies to prove it. None exist. There’s great promise for HRV/PRV utility_. For example**,**_ Prof Maiken Nedergaard, who discovered the brain glymphatics that are essential in eliminating metabolic waste products from the brain during sleep, has posited that HRV could be a non-invasive marker for neuromodulator oscillations, brain-body regulatory circuits, and brain clearance. That would be extremely useful, but like everything else on HRV and readiness scores it requires solid research and validation. The lay media isn’t helping much to get the story straight. Earlier this year The Economist published a piece entitled “The most useful indicator of your overall health” which ordained HRV as an “accumulated stress score.” That’s akin to the false assertion about VO2max: “V02 max is the singular most powerful marker for longevity.” As I’ve summarized here, that is not established. The fact is that so many things can lower HRV, including physical exercise (especially an intense workout), reduced sleep quality, stress, the list above, no less the device, signal, and software. Whatever fluctuations observed have not been correlated with any health outcome. Sadly, “datamaxxers” are widely using HRV and readiness scores that have never been validated to mean anything. We already know that for some people using the sensors for sleep metrics, it can induce “orthosomnia,” an obsession to get high sleep quality, with associated high levels of anxiety. In an experiment done by a company to promote sleep quality for its employees, “For those employees who did use the trackers, many reported feeling perfectly rested until their tracker told them they had had a terrible night. Others were told that they had slept like a baby when they had actually been lying awake worrying about the quality of their sleep. “ The same problem can result from preoccupation with HRV or readiness scores, with anxiety that would lead to further reduction in both. It you are using a wearable like >100 million American adults, it’s OK to look at these data, but contextualized with the major caveats reviewed here. If you are one to require evidence that HRV or readiness scores are linked to health outcomes, you may not even want to look. The companies make it hard to turn them off! Let me end with the companies that make and sell wearables. Apple’s doubling down on HRV (24-fold more reporting and heart rate very 5 seconds) and introduction of a Readiness score tells us that consumers have bought into these metrics and they are joining the club. However, all of this is occurring with a backdrop of tens millions of users, claims about the data that are not backed up by adequate evidence, marketing way out in front of whatever limited data exists, and not being transparent about their readiness score algorithms. The companies can well afford to do the research that is needed to connect these metrics with health outcomes show, once and for all, that increasing HRV or using readiness scores promotes our health. If they believed and invested in the products they are selling, we’d not be in this position of not knowing. That’s essentially where we are with HRV and readiness scores. Perhaps someday this will change and we’ll have good reason to embrace them. NB: I wrote this post. No AI. I have no conflicts of interest with any of its content. Loading... Ground Truths has 215,000 subscribers from every US state and 214 countries. There are over 300,000 followers of Ground Truths so more than 90,000 folks who can easily convert to be free subscribers. Your subscription to these free essays and podcasts makes my work in putting them together worthwhile. If you’re not a subscriber, please join! If you found this interesting PLEASE share it! Share Ground Truths The proceeds from all voluntary paid subscriptions go to support our summer internship program. It enabled us to accept and support a record number of 62 summer interns that joined us in 2026! These are high school, college and medical students selected from thousands of applicants. We couldn’t do this expanded program without the funds coming in through Ground Truths. Thank you!
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