SCROLL NEWS / DISCOVERY
Search headlines
Find the stories shaping the conversation.
Results for " NIA " 10,026 found 🔀 AI-powered Shuffle
California High-Speed Rail watchdog says cash crisis could mean even shorter Central Valley segment
The California High-Speed Rail project is expected to run out of funding by December 2027, and it could mean an even shorter first segment through the Central Valley than what lawmakers and project officials had been planning, according to the project's government watchdog.
How will California's new law restricting social media for kids work?
California will implement a new law in January that bans social media platforms from offering addictive features, such as infinite scroll, autoplay, and algorithm-driven "For You" feeds, to kids under the age of 16.
California Politics 360 full episode | Financial troubles ahead for CA high-speed rail
The project’s watchdog is sounding the alarm that the high-speed rail project could be out of money by December 2027.
Steve Hilton talks tax cuts, DMV overhaul, $3 gas and his other plans for California
Republican candidate for governor, Steve Hilton, was pressed more about his plan to make major tax changes, restructure the DMV, and lower gas prices during a detailed interview on California Politics 360.
'I'm so, so sorry': Ed Sheeran speaks out at his first show after Macklemore controversy
Before performing in Philadelphia on Sept. 19, Ed Sheeran addressed the controversy surrounding Macklemore’s removal from the U.S. dates of his Loop Tour following pro-Palestinian remarks made onstage.
Conectando Dreamers: The Three Cities of Ross Mintzer
A bright red full moon hung low over Nahuel Huapi Lake one night in 2026, as hundreds gathered beneath Patagonia’s stars for the second Conectando Dreamers festival in San Carlos de Bariloche, Argenti...
Dealroom.co | Terra Behavioral Health makes first acquisition, buying California's Latitude Recovery
What's the deal? Temecula, California-based Terra Behavioral Hea…
Asm. Lowenthal explains his bill reducing addictiveness of social media to teens
(Inside California Politics) — This week on Inside California Politics, fill-in host Eytan Wallace speaks with two political strategists to discuss the California gubernatorial race and recent comments by Gov. Gavin Newsom about his potential run for the presidency of the United States. Then Asm. Josh Lowenthal joins the show to discuss his bipartisan youth […]
German state elections on track for high turnout with Merz's future on the line
Seven percentage-points higher turnout in Mecklenburg-Western Pomerania, four points in Berlin
Hundreds line up for free caffeinated drinks at 7 Brew stand in South Charleston
A crew of about 30 gave away free sweet, colorful caffeinated iced drinks on Sunday, Sept. 20, 2026, at the not-yet-opened 7 Brew location in the Park Place retail center in South Charleston, West Virginia. The Arkansas-based chain expects to open at 5:30 a.m. on Oct. 5, 2026.
Roman telescope captures its first test image
NASA's Roman telescope captured its first test image with its 300-megapixel infrared camera. Full scientific images are expected in early 2027.
Open Thread, September 20, 2026: Two Truths and a Lie
Your daily source for off topic chatter with the MMA Mania faithful.
Play'n Go partners with Ember Entertainment to expand portfolio
The renowned online casino game provider announced a new partnership to power titles in West Virginia, with two other states planned in the near future.
Business Briefcase: Symposium lined up to build PA workforce
ORWIGSBURG — A Workforce Leadership Symposium — Building Pennsylvania’s Workforce … Strategies for Turning Shortage into Opportunity — is planned for 9-11:30 a.m. Oct. 22 by the Schuylkill Chamber of Commerce at Orwigsburg Veterans Memorial…
Patients who fight health insurance denials often win
New data show how often insurers deny prior authorizations that can stall patients’ care — and how frequently those decisions get reversed.
Double-digit increases await Pennsylvania Obamacare enrollees
For the second year in a row, Pennsylvanians with individual health insurance through the Affordable Care Act will see an average double-digit increase...
Tennessee Titans scouted Virginia Tech vs. Maryland
The Tennessee Titans scouting department has been less visible than other NFL teams during early college games.
ACC football power rankings after Week 3
Week 3 was a chaotic one in the ACC, with the Virginia Cavaliers and Louisville Cardinals both losing. Here are the updated power rankings
Takeaways from Maryland football’s 35-26 disappointment against Virginia Tech
The Terps couldn’t get a ground game going and got gashed on the other side of the ball.
Billionaires abound in California. Why not tax their wealth?
No state may be a more natural fit for a tax on billionaires than California. It leans left and its 250 billionaires are worth nearly $2 trillion. But a ballot initiative to impose a one-time 5% tax might not pass.
Mark Ruffalo urges California AG Rob Bonta not to 'cave' in Paramount-Warner Bros. merger fight
Mark Ruffalo urged California Attorney General Rob Bonta not to cave on settlement talks over the $110 billion Paramount-Warner Bros. Discovery merger.
‘Who wants to sign up to deal with the political pressure?’: Smithsonian faces Trump’s culture war as search for leader is on
By René Marsh, CNN (CNN) — As the Smithsonian Institution prepares to launch a nationwide search for a new leader, an unexpected question mark hangs over the position that’s long been considered a plum one in the worlds of art, science and history. “Who wants to sign up to deal with the political pressure?” one
‘Who wants to sign up to deal with the political pressure?’: Smithsonian faces Trump’s culture war as search for leader is on
As the Smithsonian Institution prepares to launch a nationwide search for a new leader, an unexpected question mark hangs over the position that’s long been considered a plum one in the worlds of art, science and history.
From Watts to L.A. wildfires: The rise of California's troubled FAIR Plan
As leading insurers have retreated from California, one carrier has stepped in to fill the gap.
'Trespasses' review: Come for the romance, stay for the historical drama
This adaptation of Louise Kennedy's 2022 debut novel on PBS follows a clandestine affair between a young Catholic schoolteacher and a Protestant barrister during the Troubles in Ireland.
Texas candidate's racist post shows what's wrong with politics
The bigoted Bo French is running for railroad commissioner. His racist social media post drew scathing condemnation, though not from Gov. Greg Abbott or the ethically bankrupt Senate nominee Ken Paxton.
California Republicans walk tightrope as Trump jumps into campaigning
California Republicans running in the state's most competitive House races are appearing to keep some measure of public distance from Trump ahead of the Nov. 3 election.
Meet Kianoosh Nawai, the West Virginia eighth-grader who built a low-cost 3D-printed bionic hand and became his state’s only finalist in a national STEM contest
Kianoosh Nawai, an eighth-grader at West Virginia Virtual Academy, wanted to explore how technology could help people with disabilities. His project led him to design and build a 3D-printed prosthetic hand that aims to offer a lower-cost option for people who have lost a limb.
Wolverine developer Insomniac denies using generative AI after fans spot strange restroom sign
Insomniac denies using generative AI on Marvel's Wolverine after fans spotted a strange bathroom sign, blaming a "UV map bug" instead.
Iranian Academic Outlines Strategic Impacts of Confrontation with US, Israeli Regime
TEHRAN (Tasnim) – University professor Hamid Reza Moqaddamfar outlined 10 strategic consequences of Iran’s confrontation with the US and Israel, arguing that the conflict went beyond the failure of Washington and Tel Aviv to achieve their military objectives and challenged key pillars of US power.
UFC 331 Bonuses Revealed After Violent Event
Following Saturday’s UFC 331 event, the promotion revealed who won the post-fight bonuses following a violent card. UFC 331 took place on Saturday, September 19, at Crypto.com Arena in Los Angeles, California. Below are all the bonus winners for the latest UFC event. Fight of the Night ($100,000 to each fighter): Joshua Van vs. Alexandre […] The post UFC 331 Bonuses Revealed After Violent Event appeared first on HEAVY.
Hormuz Strait Remains Under Iran’s Control: Military Spokesman
TEHRAN (Tasnim) – The initiative in the Strait of Hormuz remains in the hands of Iran's powerful Armed Forces, a senior spokesperson for the Iranian Armed Forces said.
Sooo ... About Last Night
Last night (Sat., Sept. 19, 2026), Ultimate Fighting Championship (UFC) ventured forth to Crypto.com Arena in Los Angeles, California for UFC 331. In the main event, Alexandre Pantoja returned from nearly a year on the sidelines to challenge Joshua Van, the man who broke his arm in their controversial UFC 323 bout. In addition to […]
President Expounds on BRICS Summit Achievements
TEHRAN (Tasnim) – Iranian President Masoud Pezeshkian outlined the achievements of his recent visit to India and participation in the 18th BRICS Summit, emphasizing the need to strengthen multilateralism, expand economic and trade cooperation, and counter unilateralism.
Alameda County health authorities alert of possible measles exposure
State and Bay Area health officials warned of a possible measles exposure Friday after a person infected with the disease traveled by train from the Midwest through California.
Congo begins Ebola vaccinations for health workers
Congo has begun vaccinating healthcare workers against Ebola in Bunia, the epicenter of the fastest-growing outbreak of the disease in history.
Early voting begins in US midterm elections that could flip control of Congress
In Fairfax, Virginia, 18-year-old Sanya Singhal said she voted early to “try to be the first early voter.” In Henrico County, Laura Bland said she cast a ballot to send “a signal that we’re still here.”
California health officials warn of possible measles exposure on Amtrak trains
Possible measles exposure reported at Philadelphia International Airport not related to CHOP case
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.
Congo begins Ebola vaccinations for health workers in the epicenter of the outbreak
Congo has begun vaccinating healthcare staff against Ebola in Bunia, the epicenter of the fastest-growing outbreak of the disease in history.
Pro-Palestinian protesters target Ed Sheeran’s Philadelphia concert after Macklemore removed from tour
Pro-Palestinian protesters waved flags and chanted outside Ed Sheeran's Philadelphia concert, one week after Macklemore was dropped from the tour.
Voting groups say funding shortfall could affect midterm turnout
Several of the nation’s largest voter engagement and racial justice organizations are facing steep funding shortfalls and staffing cutbacks
Health officials warning people about measles exposure across 6 counties in CA: Here's what we know
Health officials are warning about a possible measles exposure across California including in the Bay Area. A person with measles who was unvaccinated traveled around the state in trains and buses, ac...
Health officials warning people about measles exposure across 6 counties in CA: Here's what we know
Health officials are warning about a possible measles exposure across California including in the Bay Area. A person with measles who was unvaccinated traveled around the state in trains and buses, according to health officials.
LANL: Four Los Alamos Researchers Receive Laboratory Fellows’ Prizes
Virginia Manner, Dru Renner, Dan Hooks and Earl Lawrence. Photo Courtesy LANL LANL NEWS RELEASE Four Los Alamos National Laboratory researchers have been awarded Laboratory Fellows’ Prizes: Virgini…
Rabies Cases Prompt Nationwide Health Advisory: What VA Residents Should Know
Reports of people exposed to rabid or possibly rabid animals are rising across the country. Here's where Virginia cases stand.
California warns of measles exposure in six counties from unvaccinated train passenger
Health authorities work to notify people who were exposed to person who traveled through at least six counties
Newsom signs California's first standalone post-production tax credit
Gov. Gavin Newsom signed AB 2319, California's first standalone post-production tax credit, offering 35% to 50% back to lure editing, sound and VFX work home.
Insomniac Says Marvel's Wolverine Uses No Generative AI After Fans Spot Strange Signs in-Game
Insomniac Games has stepped in to confirm Marvel's Wolverine contains no generative AI after a few bizarre in-game signs raised eyebrows on social media.
Congo begins Ebola vaccinations for health workers in the epicenter of the outbreak
Congo has begun vaccinating healthcare staff against Ebola in Bunia, the epicenter of the fastest-growing outbreak of the disease in history.
Congo begins Ebola vaccinations for health workers in the epicenter of the outbreak
BUNIA, Congo (AP) — Congo on Saturday began vaccinating healthcare staff against Ebola in Bunia, the epicenter of the fastest-growing outbreak of the disease in history as they are “particularly
Congo begins Ebola vaccinations for health workers in the epicenter of the outbreak
Congo has begun vaccinating healthcare staff against Ebola in Bunia, the epicenter of the fastest-growing outbreak of the disease in history.
Congo begins Ebola vaccinations for health workers in outbreak epicenter
Congo has begun vaccinating healthcare staff against Ebola in Bunia, the epicenter of the fastest-growing outbreak of the disease in history
President Trump on why he’s banning media outlets from the White House
President Trump said he would block MS NOW, CNN and Politico from White House grounds.
Hibernian 1-1 Aberdeen: What the manager said
From a club point of view they'll make the decision when it's ready to bring a new head coach in, or new coaching team. The players have got a few days off, and I'm sure I'll hear from the club at the start of the week what's happening.
DNA Has a Four-Letter Alphabet. Scientists Just Expanded It to Eight
Researchers showed how a natural bacterial enzyme can accurately transcribe DNA containing four extra genetic letters. Life uses a four-letter DNA alphabet, but could its genetic machinery read a larger one? Researchers at the University of California San Diego have shown that RNA polymerase, the enzyme that copies DNA instructions into RNA, can accurately transcribe
SMPD Commander Totorica graduates from FBI National Academy
Santa Maria Police Comm. Nathan Totorica has graduated from the 299th session of the FBI National Academy in Quantico, Virginia.
Kennedy tells antivaccine activists they have a friend in White House
Health and Human Services Secretary Robert F. Kennedy Jr. tells antivaccine activists from an organization he once chaired that they have a friend in the White House.
PA Health Department prepares to withdraw request for CDC aid amid rise measles cases
Pennsylvania Secretary of Health calls on the CDC to publicly recognize four measles-associated deaths
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!
Scientists discover a new tiger cat hiding in plain sight
A newly identified South American tiger cat is the first cat species discovered in a century. revealing more diversity among tiger cats than previously known.
For Palestinian aid groups, Macklemore’s $1M pledge brings relief and attention to ongoing suffering
Macklemore's $1 million donation pledge is coming at a critical time for Palestinian relief nonprofits.
For Palestinian aid groups, Macklemore's $1M pledge brings relief and attention to ongoing suffering
Macklemore's $1 million donation pledge is coming at a critical time for Palestinian relief nonprofits | WWL
The escalating standoff between the CDC and Pennsylvania over measles deaths
Pennsylvania has reported fourth deaths associated with measles, but the CDC has not included them in its national total — a conflict rarely seen in public health.
Ukraine's companies, soldiers want drones that need less human control
Ukrainian drone makers are building more autonomy into their systems so one operator can manage multiple drones.
New laws trigger a fresh legal fight over Nazi-looted art in Los Angeles and Auschwitz museums
Jewish heirs of Holocaust victims have filed lawsuits in California to reclaim Nazi-looted paintings from museums in Los Angeles and Poland.
Mahjong mania: What’s behind the rise of a centuries-old Chinese game in the US
Mahjong, a four-person game similar to rummy, skyrocketed in popularity in the past year. And it’s turned into a pricey consumer ecosystem.
Endorsement: Prop 44 uses vulnerable patients as cannon fodder
OPINION: On its surface, everything about Prop 44 on California’s November ballot looks appealing. But you don’t have to dig deep to spot the farce, the Chronicle’s editorial board writes.
Rebecca Gillispie named interim president, CEO of Clay Center
The Board of Directors for the Clay Center for the Arts and Sciences in Charleston, West Virginia, elected Rebecca Gillispie as interim president and CEO, they announced in a news release Sept. 17, 2026. They will continue to search for a permanent replacement for Al Najjar, who died in August.
Efforts to silence 'NAZA' filmmakers, Macklemore only amplifies them
“NAZA” may not need a robust marketing plan if the Israeli government continue to condemn the film. Censorship, and worse, are the surest way to elevate an artist and their work. Just ask Macklemore.
Leif-Erik Holm leads latest AfD charge in eastern Germany
A founding member of Germany's right-wing populist AfD, Holm is hoping to take the anti-immigration party into power in Mecklenburg-Western Pomerania's state elections.
2. Bundesliga preview: Arminia Bielefeld vs. 1. FC Heidenheim
In a meeting between two sides at opposite ends of the table after five games, Sunday’s clash presents Bielefeld with an opportunity to end their recent run without a win, while Heidenheim will be l...
California entrepreneur warns billionaire wealth tax could trigger 'giant sucking sound' of business exits
Eric Schiffer warns California's Proposition 40 wealth tax could trigger a mass exodus of billionaire entrepreneurs, draining jobs and tax revenue.
Commentary: Raise taxes on billionaires federally, not state by state
I favor higher taxes on the ultra-wealthy. But I worry that California’s proposed tax on billionaires will inflict lasting damage on the economy and undermine the state’s status as a
EU urges US to reconsider visa denial to Palestinian delegation for UN meeting
'We urge the United States to reconsider this decision'
Lucas: Gavin Newsom playing a losing political hand
Did California Gov. Gavin Newsom peak too soon?
Fragomen - A World of Difference in Immigration - Immigration attorneys, solicitors, and consultants worldwide
The California Minority Counsel Program's annual business conference brings together law firm partners, corporate counsel and public sector leaders for discussions on leadership, business development…
UFC 331 Rivals Separated After Tense Ceremonial Weigh-In
All 24 fighters made weight in Los Angeles. The full UFC 331 card with every official weight, start times and Saturday's stakes.
‘Summer of truth’: will political leaders act as climate chaos comes knocking?
Amid record-shattering heatwaves and popular demand for climate action, why are politicians often timid or in denial?
California health department notifies of measles exposure from unvaccinated Amtrak passenger
The California Department of Public Health (CDPH) is urging residents to get their measles vaccination after notifying the public of an exposure from an Amtrak passenger who traveled on the rail syste...
California health department notifies of measles exposure from unvaccinated Amtrak passenger
The California Department of Public Health (CDPH) is urging residents to get their measles vaccination after notifying the public of an exposure from an Amtrak passenger who traveled on the rail system's train and Thruway bus service in six different counties earlier this month.
Converse apologizes after ad is slammed for imagery likened to KKK
The popular sneaker brand Converse has apologized and pulled a controversial ad condemned by social media users who said it evoked Ku Klux Klan imagery.
Person with measles rode Amtrak trains and buses across CA, health officials say
The California Department of Public Health said the unvaccinated passenger stopped at six California stations, including downtown Sacramento.
Frankie Muniz says he's living a 'nightmare' in wake of divorce
Frankie Muniz says he's living a nightmare he wants to wake up from following the announcement of his split from wife Paige Price. In July, the two announced they were ending their marriage after seven years.
California entrepreneur warns billionaire wealth tax could drive business leaders out of state
Entrepreneur Eric Schiffer discusses the potential economic consequences of California’s Proposition 40, including concerns that the proposed one-time 5% wealth tax could push wealthy residents and entrepreneurs to leave the state.
$1 Million Fellowship in Coffee Science Established at UC Davis
The Specialty Coffee Association, or SCA, and the University of California, Davis, announced the establishment of the Specialty Coffee Association Endowed Fellowship in Coffee Science, made possible by a $1 million gift from the SCA to support graduate coffee research at the UC Davis Coffee Center, a center of excellence in the College of Engineering.
OHSAA football scores | Hudson vs. Nordonia live updates, highlights
Nordonia High School plays Hudson in a pivotal Suburban League National Conference football game. Follow here for live updates and scores.
Paramount and California AG Bonta Reportedly Closing in on a Settlement
Per the Wall Street Journal, the two sides are in "advanced talks" to resolve the case.
New public charge rule takes effect amid lawsuits
The new rule gives immigration officials significantly broader discretion in determining whether someone is likely to become primarily reliant on public assistance.
Kim Kardashian's scary diagnosis. What is esophagitis?
Kim Kardashian reveals she has been diagnosed with esophagitis in a new trailer for "The Kardashians." The condition, left untreated, can lead to the same cancer that killed her dad.
Insomniac Confirms Wolverine Doesn't Contain AI-Generated Assets After A Weird-Looking Sign Goes Viral
A funky-looking bathroom sign is the result of an in-game glitch and is not AI slop
What are we watching for against Vanderbilt?
Welcome to Week 3, everyone. 1.) You get one mulligan. CJ Bailey looked like a freshman in the Virginia game, and the team overall was so bad that I have to think that it’s front of mind as they get ready for Vanderbilt—that performance was not just bad, it was embarrassing. State was DOA at […]
DHS may have violated state election law, Virginia's AG says after whistleblower report
Virginia's attorney general said Thursday that the Department of Homeland Security may have violated several state laws after a whistleblower accused its employees of misrepresenting themselves on voter lookup tools to hunt for noncitizen voters.
Fresno unemployment rises to 7.8% in August
Fresno County unemployment rose to 7.8% in August as Valley rates remained above California’s average. See how local counties and jobs compare.
'The Ford/Hill Project' review: Anita Hill, Christine Blasey Ford testify
In 'The Ford/Hill Project,' a new docudrama created by Elizabeth Marvel and director Lee Sunday Evans now at REDCAT, the Senate testimonies of Anita Hill and Christine Blasey Ford are entwined to throw into relief enduring political patterns.
Pennsylvania health officials urge early measles vaccinations as outbreak grows
Pediatricians are urging families to vaccinate their children against measles earlier than usual as Pennsylvania continues to see rising case counts.
Judge isn't swayed by government's claims that plans for an 'anti-weaponization fund' are dead
U.S. District Judge Leonie Brinkema in Virginia rejected the notion that the case's claims are moot because the Trump administration says the fund is dead and won't go forward.
Wall St ends mixed as oil takes a pause
Wall Street closed mixed as US Treasury yields topped 5% and oil prices paused above $100 per barrel, keeping inflation concerns in focus.
Virginia Tech’s Season Begins Saturday Night Against Maryland
Virginia Tech enters Saturday night's game against the Maryland Terrapins, sitting at 2-0 on the season for the first time in five years. For the Hokies, it's been a solid start to the James Franklin era. Tech has thoroughly beaten two overmatched opponents at home in Blacksburg, and will now head on the road for …