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What’s a Classic Car? Younger Collectors Prize Less Heralded Models.
Baby boomers embraced brawny cars from the 1950s and ’60s, but as new collectors take up the hobby, Mazdas and Nissans from the 1980s and ’90s are hot, and still don’t break the bank.
What’s a Classic Car? Younger Collectors Prize Less Heralded Models.
Baby boomers embraced brawny cars from the 1950s and ’60s, but as new collectors take up the hobby, Mazdas and Nissans from the 1980s and ’90s are hot, and still don’t break the bank.
Alabama Democrats facing tough political gravity
Even a little uncertainty in some of the Alabama races should give Democrats some hope.
Can RFK Jr. help GOP win the midterms? Iowa is a test
How one state's governor's race is a test of whether Robert F. Kennedy Jr.'s MAHA movement has an enduring political draw.
Whether you like it or not, celebrities have an impact on politics
The global groundswell of support for Macklemore’s pro-Palestinian advocacy serves to remind us that maybe celebrity activism really is that deep after all, writes Cheek’s Varsha Yajman. Subscribe In the last week, publications, podcasts, and influencers that have either rarely or never spoken about Israel’s genocide in Palestine have flooded my social feed. And it was all because singer Ed Sheeran and his team dropped Macklemore as his opener for saying “Free Palestine” on stage. Millions raised, millions speaking up in support of Palestine - all of this confirming my view that, whether I like it or not, celebrities do have an impact on political outcomes. And this is interesting when much of the time celebrity activism can induce an eye roll - I love to see Charli XCX pointing out a Palestinian flag in the crowd, but it’s hardly the bold symbol of allyship that some fans would make it out to be. But there’s a line between healthy scepticism and outright dismissal - and I’d argue that the latter lets the rich and powerful off far too easily. For instance, actress Jennifer Lawrence, once outspoken about her political views, last year told The Times she no longer believes celebrities have a role to play: “Celebrities do not make a difference whatsoever on who people vote for. So then what am I doing? I’m just sharing my opinion on something that’s going to add fuel to a fire that’s ripping the country apart.” While it’s a narrative she might find comfort in, it simply is not true. Grassroots movements often garner worldwide attention when celebrities and other high-profile spokespeople bring a mainstream platform to their causes. And this frustrates me. We have had three years of a live-streamed genocide. Macklemore himself has been calling for a Free Palestine long before he booked the Sheeran concert. Yet it’s the high-profile fallout of the last week that finally seems to have made saying “Free Palestine” socially acceptable in the mainstream. It feels like the collective mood has shifted, where calling out censorship is now the obvious response - not just the business of ‘radical’ activists. To recap, Sheeran’s decision followed an ultimatum from billionaire Robert Kraft, owner of Gillette Stadium, one of the venues Sheeran was scheduled to perform at: either drop Macklemore as your opener after only two of the eight scheduled shows, or you do not play at any stadiums. Sheeran’s disappointing decision to stand on the side of billionaire-led censorship has ultimately seen a surge in support for Free Palestine. It began when all his openers and his backing band pulled out of Sheeran’s tour, in solidarity with Macklemore and with the Palestinian cause. It was met with an uproar of support from those who had never or barely touched politics before: influencers lip-syncing to Macklemore’s music, singers like Jack Antonoff singing “Free Palestine,” and publications and podcasts standing with Macklemore. And finally, we saw material support: Macklemore donated $1 million in profits from his two nights opening for Sheeran’s tour to several Palestinian aid groups and called for Sheeran and Kraft to match it, which they have since promised to do. We’ve also seen children’s entertainer Ms Rachel follow suit with a $1 million donation to Palestinian aid, and publication PopBase has donated $10,000. Anera, a humanitarian aid group working in Palestine, Lebanon, and Jordan, said donations since Macklemore’s announcement were more than triple this month’s daily average. The group’s Instagram page has also gained 8,000 followers. Macklemore far from the first celebrity to speak and participate in politics in the Western World. In 1924, singer Al Jolson supported Republican candidate Warren G. Harding for president, and decades later, celebrities such as Harry Belafonte, Lena Horne, and Aretha Franklin voiced their public support for the Civil Rights movement. More recently, in the lead-up to the 2024 US election, ‘The Daily Show with Trevor Noah partnered with the organisation Power the Polls to recruit poll workers to address shortages- a problem disproportionately affecting voters of colour. The campaign saw 170,000 new sign-ups - 35,000 of which came directly through the TV show’s link - resulting in the recruitment of 713,000 total poll workers that year, an almost three-fold increase on the organisation’s goal. Alongside recruiting workers, celebrities in the US (where voting in elections is not compulsory) have made a huge difference by calling for people to register to vote. Taylor Swift’s endorsement of Kamala Harris in 2024 saw over 400,000 visitors on the voter registration site within 24 hours of her Instagram post. In 2023, Swift had urged her fans to register, resulting in 35,000 new voter registrations. Similarly, Ariana Grande promoted voter registration in 2019 by setting up booths at concerts on the American leg of her tour, resulting in over 33,000 voters registering. And the same thing is happening closer to home. This year, musician Jack River successfully called for government action to ensure creatives in Australia do not have their work scraped by generative AI companies. Celebrity as the mediator between the punter and the politician Celebrity activism isn’t just a feel-good news story - research tells us it actually makes a difference. By directing attention to issues affecting the average person, like voting inaccessibility or a lack of action on a genocide, researchers Alfred Archer and Amanda Cawston state that “celebrities can play a useful bridging role between political elites and the people they represent”. Alternatively, in a world where talking about politics is “not cool,” or where people lack exposure or knowledge to engage with politics, celebrities can act as an educational resource or an entry point into the political world - when they speak up about an issue, their audience gets exposed to it. Olivia Rodrigo’s Daisy Chain Fields festival is a perfect example. Rodrigo partnered with twelve organisations focused on women’s issues, such as reproductive rights. These organisations had stalls at the festival for people to meet them and were also featured heavily on social media, giving their issues global attention and raising $20 million for the organisations. We have also seen celebrities at award shows such as the Emmys wearing F*CK ICE pins, referring to the U.S. Immigration and Customs Enforcement’s treatment and detainment of people - generally people of colour. When celebrities speak up about political issues in public forums, they put the issue at the forefront of mainstream media, rally their supporters, and make it clear that, however much they disagree, the government cannot simply ignore it. Our over-reliance on celebrities versus our politicians As much as I love seeing my favourite celebrity use their platform for a good cause, there is an important question to ask: not whether celebrity activism is good or bad, but whether we should have to rely on celebrities. And the answer would, in an ideal world, be no. In an ideal world, or merely a just world, action on Palestine would’ve happened decades ago, climate change would be taken seriously, and most importantly, people would understand their democratic rights. However, that is not our reality. Only around 28 per cent of Australian Year 10 students reach proficiency in civics and citizenship. In the US, almost two-thirds of people under 30 say high school civics education didn’t prepare them to understand voting deadlines, how to research candidates, or how to vote by mail. When civics education is weak, our trust in these institutions and our understanding of change-making processes also decline. This is where celebrity steps in and becomes our main source of reliance. As Mary R. Connelly notes in _The Tartan, “_Celebrities will always be involved in campaigns in one form or another, but their presence is not what causes people to vote blindly. The lack of political engagement and literacy is what allows celebrities to wield their influence on the political sphere so impactfully.” About the author Varsha Yajman is the Digital Content Producer at Cheek Media. She is a youth advocate and lawyer with a background in climate litigation and is passionate about looking at the intersection between race, climate justice, and mental health. Thanks for reading Cheek Media Co. ! This post is public so feel free to share it. Share
These races will decide whether Democrats or Republicans win House control
A handful of swing districts will determine which party wins control of the House of Representatives in 2026.
These races will decide whether Democrats or Republicans win House control
A handful of swing districts will determine which party wins control of the House of Representatives in 2026.
Republic of Ireland braced for testing Nations League
BBC Sport NI looks at how Republic of Ireland and their opponents - Kosovo, Israel and Austria are shaping up for the Nations League.
African players in Europe: Semenyo brace helps City top table
Ghana star Antoine Semenyo scored twice for Manchester City, whose 5-3 victory over Sunderland took them to the top of the Premier League table at the weekend.AFP Sport highlights African headline-makers in the major European leagues: ENGLAND ANTOINE SEMENYO (Manchester City) Semenyo scored his first goals this season in the win over Sunderland.
Med Center Health 10K runners pounded the pavement Saturday
The Med Center Health 10K Classic, in its 47th year, was run Saturday , Sept. 19, 2026, at the Bowling Green Ballpark. The event featured a 10K wheelchair race, 10K race, 5K race and the Children’s Classic Run. Titus Winders won the men’s overall title with Corbin Harris coming in second and Wayne Blas third. Purity Sanga won the women’s overall title with Daisy Jepkosgei second and Rachel Tinius third. Matthew Porterfield won the wheelchair race with Matt Davis coming in second. Aerelle Jones won with 10K female wheelchair race. The top three male 5K winners were, in order, Lucas Page, Jay Beckner and Logan Rose. The top three female 5K winners were, in order, Sarah-Emily Woodward, Anna Cline and Autumn Tandy. (Joe Imel/Daily News)
Young people in Morocco split over whether politics can deliver change as election draws near
In Morocco’s election race, a rural funeral has become an unexpected campaign stop for candidates aiming to engage disenchanted young voters
Trail Blazers Face Tough Reality in Loaded Western Conference Race
Despite adding Ja Morant, Portland faces a ruthless playoff hunt as twelve Western Conference rivals battle for postseason positioning in an era where tanking has lost its luster.
Annual Belt Sander Drag Race raises funds for New Bern High art students
Power tools hit the racetrack Sunday afternoon as local woodworking business Shop Class hosted its sixth annual Belt Sander Drag Race to raise money for high school art students.
Robert Kraft set a ‘powerful example’ with Macklemore ban, political analyst says
‘Fox News Sunday’ panelists discuss the Michigan U.S. Senate race, the controversy involving Ed Sheeran and Macklemore and the future of the Kennedy Center in Washington, D.C.
Women's health: what physicians say, in their own words
What obstetricians, gynecologists, and the women they treat have written on KevinMD about pregnancy, maternal mortality, postpartum care, fertility, contraception and abortion, menopause, and the conditions dismissed for years. Every claim named, dated, and linked.
Devin Booker Reaffirms Long-Term Commitment to Phoenix Suns
Amid rising league-wide volatility, the four-time All-Star embraces a dual role as franchise lifer and veteran mentor, intent on recruiting elite talent to spark a championship resurgence.
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
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.
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.
TEXAS TOSS UP: Real Clear Politics Shifts Governor’s Race to “Toss Up” as Hinojosa’s Momentum Surges | Gina Hinojosa for Texas Governor
Austin, TX – Following new polling from ReconMR/Siena showing Gina Hinojosa leading the Texas Governor’s race by 4 points, Real Clear Politics moved the race for Texas Governor to a “Toss Up.” “This is a watershed …
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...
Most Automakers Race What They Sell. With the GR GT3, Toyota Is Selling What It Races
Instead of designing a road car and then modifying it for the track, Toyota prioritized the needs of racing in the GR GT's design.
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.
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 […]
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.
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 […]
A new documentary traces the changing role of women in Texas Republican politics
New documentary, "Life of the Party," examines how women's roles in Texas Republican politics have changed over three decades through the experiences of Geanie Morrison, Sarah Davis and Mayra Flores.
Eichenbaum Acorns: A passion for retina science with Andrea Gibson, PhD, and Erin C. Henry, PhD | Eye Care Network
Andrea Gibson, PhD, and Erin C. Henry, PhD, trace 20 years in retina drug development—and the pathway gap still facing young scientists.
'We are on our way to groundbreaking science': NASA shares first test image from Roman telescope's 300-megapixel camera
This week, NASA turned on the Nancy Grace Roman Space Telescope's powerful 300-megapixel camera for the first time. The debut test image promises "groundbreaking science" to come with NASA already talking about doubling the mission's lifespan.
'We are on our way to groundbreaking science': Stars turn neon-green in first test image from NASA's Roman telescope — Space photo of the week
This week, NASA turned on the Nancy Grace Roman Space Telescope's powerful 300-megapixel camera for the first time. The debut test image promises "groundbreaking science" to come with NASA already talking about doubling the mission's lifespan.
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.
AI agents can finally run your errands
Tech firms like Meta are betting users will embrace AI agents, even though they have shown they aren't always aligned with our interests.
Aurora, Woodridge XC capture team titles at Spartan Invitational
In eight varsity races, the Greater Akron and Portage County areas combined for two team titles and two individual titles.
Complete NASCAR Cup points standings after 2026 Bristol Night Race
We have a new points leader, as Larson edges ahead of Hamlin in the championship fight
Opinion: Division and innuendo have no place in New Mexico politics
A Community Council member reflects on race, representation and the harm of division in New Mexico politics.
Franciscan Health, Lake Co. Health Department partner for Path to Hope Suicide Awareness & Prevention 5K
CROWN POINT, Ind. – Franciscan Health is partnering with the Lake County Health Department to host the Path to Hope Suicide Awareness & Prevention 5K. The event is scheduled to take place starting with registration at 9 a.m. and the race starting at 10 a.m. on Saturday, Oct. 3 at the Lake County Fairgrounds, Shelter 6, 889 S. Court St. in Crown Point. The event is intended to bring the community together to raise awareness for suicide prevention and mental health, reduce stigma and honor those lost to suicide. Scheduled organizations planning to attend include National Alliance on Mental Illness
Cam Schlittler Gets Great Sign For Entering AL MVP Race
Second year pitcher Cam Schlittler is the strong American League Cy Young candidate, but he may have a chance at another award. The New York Yankees ace continues to add to the great body of work and saw his ERA dropping below 2.00 in recent weeks. Schlittler has an outside chance at the AL MVP […] The post Cam Schlittler Gets Great Sign For Entering AL MVP Race appeared first on HEAVY.
Saracens take command to overrun Tigers
By BEN JAYCOCK LAST season’s double winners Saracens made a devastating opening statement of intent in the PWR Cup with a 66-0 demolition of Leicester Tigers yesterday, running in 10 unanswered tries. Charlotte Wright-Haley opened the scoring for the holders after three minutes before Joia Bennett, Daisy Fitzgerald and Emma Hardy crossed to establish a […] The post Saracens take command to overrun Tigers appeared first on The Rugby Paper .
Inside NASCAR Bristol Bass Pro Shops Night Race best photos
Here are our best photo from the Bass Pro Shops Night Race at Bristol in the NASCAR Chase.
New nanoparticles make hidden chemical differences light up
Scientists have developed ultra-bright nanoparticles that can detect tiny amounts of chemicals and distinguish between molecules that look almost identical. The technology could one day provide a cheaper way to catch dangerous drug impurities or trace pollutants using simple low-cost lasers.
Eritrea's G-15 political prisoners: 'I don't even know if my parents are alive'
The children of key politicians jailed 25 years ago without a trace in Eritrea want answers.
MLT’s new family-focused indoor entertainment complex open for business
Just in time for the rainy season, Monster Mini Golf opens its doors in Mountlake Terrace, across the street from the Grocery Outlet and Cinebarre. The 18-hole, glow-in-the-dark, mini golf […]
MLT’s new family-focused indoor entertainment complex open for business
Just in time for the rainy season, Monster Mini Golf opens its doors in Mountlake Terrace, across the street from the Grocery Outlet and Cinebarre. The 18-hole, glow-in-the-dark, mini golf […]
Chile's Bachelet quits race to be next UN chief
Michelle Bachelet, the former president of Chile, withdrew her candidacy for the position of United Nations secretary-general on Saturday, weeks after a straw poll showed her in second to last
Massachusetts labor union endorses nearly all incumbents as businesses, workers flee
The Massachusetts AFL-CIO is endorsing 14 of 15 incumbents in major state and federal races in the general election as a massive outmigration of businesses and working-aged residents continues.
2. Bundesliga: Former Fulham youngster Thorsteinsson extends Hertha’s perfect record
Hertha BSC returned to 2. Bundesliga summit with a comeback win in Dresden. Former Fulham youth team player Jón Dagur Thorsteinsson was the star of the show with his first brace in German football.Bo...
Trump announces new 'AI Force,' vows to protect industry as AI czar announcement nears
Trump's new AI Force mirrors his first-term Space Force creation, with a high-IQ "czar" appointment coming soon to oversee the booming industry.
Beyond the Headlines: Don Davis discusses health care, rural needs and District 1 race
U.S. Rep. Don Davis sat down with News 12 for a wide-ranging Beyond the Headlines interview about issues affecting North Carolina's 1st Congressional District a
The race to build a pandemic-proof world
Six years after COVID-19 killed millions, battered health systems, disrupted lives and brought the global economy to a virtual standstill, the world is still grappling with how we can prepare better for the next pandemic.
Belmont Park back in business with first races after $550M renovation
They're off and running at the new Belmont Park.
China is winning the science race while Washington freezes American innovation
Politically delayed federal research grants freeze medical trials and risk ceding American scientific leadership to China.
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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