How Accurate Is Oura Ring Calorie Burn? What 3 Studies Show

Your Oura Ring says you burned 2,900 calories today. Should you believe it? Roughly: it tracks effort well but averaged a 21% error in the only lab test, and no study has tested Ring 4 or Ring 5 for calories.

Only three peer-reviewed studies have checked Oura’s calorie numbers against a reference, and none of them used a ring you can buy today. Together they say the ring gets the shape of your day right and the size of it only roughly. This guide goes through what those studies found, how Oura actually calculates Total Burn and active calories, and what to do with the number.

We make SensAI, an AI coaching app for iPhone that can read your Oura workouts through Apple Health. We don’t sell rings and we have no relationship with Oura. Every Oura feature below was checked against Oura’s own help pages on October 22, 2026, hardware and prices against Oura’s store and press coverage, and every study against PubMed.

How accurate is Oura Ring calorie burn?

Oura Ring calorie burn is roughly accurate, not precise. In the only lab test against indirect calorimetry, Oura tracked changes in effort closely (r = 0.93) but missed by 21.1% on average, and read low at running speeds. Free-living total burn landed from 54 kcal below to 817 kcal above the reference monitors, depending on which one was used.¹²

That spread is the honest headline. Here is what each study measured:

Study	Ring tested	Reference	What Oura got	Error
Kristiansson 2023, lab, n = 2812	Gen 2	Indirect calorimetry	Activity intensity, sitting to 15 km/h running	r = 0.93; 21.1% average error; −0.4 MET bias
Kristiansson 2023, 14 days free-living, n = 3012	Gen 2	Accelerometers on hip, thigh and wrist	Total burn 2,883 kcal/day	+796 (hip), +817 (thigh), −54 (wrist) kcal/day
Henriksen 2022, up to 7 days, n = 213	Gen 2	ActiGraph hip monitor	Total burn	+148 kcal/day; 13% average error
Miwa 2026, 3 weeks, 5 Oura users4	Ring 3	ActiGraph GT9X	Active calories	−16.9% (298.9 vs 359.6 kcal/day)

Two cautions sit under that table. The free-living references were research accelerometers, not a gold standard, and they disagreed with each other: hip and wrist differed by about 845 kcal/day on the same people. And no study has tested Oura Ring 4, Ring 4 Ceramic or Ring 5 for calories.

For how Oura compares with wrist wearables as a class, our wearable calorie accuracy review covers the broader evidence.

How does Oura calculate calories burned?

Oura calculates calories from movement measured by a 3D accelerometer, converted to METs (multiples of your resting energy use), plus an estimated resting burn that Oura doesn’t disclose but researchers believe uses your age, height, weight and sex. Active calories count only movement above 1.5 METs, and heart rate sets workout intensity.¹⁵⁶⁷

Here is how the pieces fit, in Oura’s own words.

• Total Burn is “the total number of calories you burn over the course of a full 24 hours, resting or otherwise.” Oura begins it “at 4 AM” from your Basal Metabolic Rate (BMR), then adds calories as you move.⁵
• Active calorie burn is “an estimate of your net calorie burn,” counting only “the portion that exceeds 1.5 MET level.”⁶ Oura says the threshold “prevents you from logging large amounts of calories from low-intensity activities.”⁵
• Most of the number is resting burn. Oura’s glossary says it plainly: “most of your total burn comes from your BMR.”⁶
• Workouts use heart rate. A detected or recorded workout’s calories come “from the selected activity type, duration, and intensity (based on heart rate).” Without heart rate, intensity “defaults to ‘moderate’.”⁵

That last rule is new. In May 2025 Oura said active calories would now reflect heart rate, so a HIIT class may show more calories than before and yoga or casual walking may show fewer.⁷

Why does this matter for accuracy? Because the biggest part of Total Burn, the BMR estimate, is the part nobody outside Oura can check. The Gothenburg researchers noted that Oura’s resting calculation is “likely … based on sex, age, body mass, and height, but not disclosed by the manufacturer.”¹

What do the Oura calorie accuracy studies show?

The studies agree that Oura follows effort well and estimates absolute calories loosely. The lab study found a 0.93 correlation with measured oxygen use but a 21.1% average error. Two free-living studies found Oura’s total burn above hip- and thigh-worn monitors by 148 to 817 kcal/day, while a third found its active calories 17% below one.¹²³⁴

Kristiansson 2023: the only lab test

A University of Gothenburg team recruited 32 adults. Twenty-eight wore the ring through sitting, standing, walking and running at speeds up to 15 km/h while a metabolic cart measured their oxygen use (indirect calorimetry), and 30 then wore the ring and three reference accelerometers at home for 14 days.¹

One detail matters if you’ve read about this study elsewhere. The journal published a correction in September 2023 that updated the error figures, but the PubMed abstract still shows the older “<10%” claims.² The corrected numbers are the ones used here.

Activity (lab)	Oura (MET)	Calorimetry (MET)	Difference
Sitting	1.13	1.25	−0.12
Standing	1.06	1.34	−0.27
Walking, 4 km/h	4.38	4.20	+0.18
Walking, 6 km/h	5.41	6.23	−0.82
Running, 9 km/h	10.48	10.65	−0.17
Running, 12 km/h (10 people)	12.49	13.60	−1.11
Running, 15 km/h (9 people)	13.70	17.19	−3.49

Kristiansson and colleagues summarized: “In the laboratory, Oura tended to underestimate EE with increasing discrepancy as intensity increased.”¹ They concluded that the ring “cannot unambiguously be recommended to be used interchangeably with the reference monitors,” but “can detect differences at group-level for active and total energy expenditure.”¹

They also excluded people whose training was mainly cycling, swimming or strength training. No published study has tested Oura’s calorie estimates during those activities.

Henriksen 2022: ring and watch on the same people

A University of Tromsø team had 21 adults wear an Oura Gen 2 ring and a Polar Vantage watch together for up to seven days. Oura’s total burn ran 148 kcal/day above an ActiGraph-based estimate, with a 13% average error. The Polar watch ran 430 kcal/day above it.³

“Both activity trackers overreported TEE, but the Polar Vantage watch overreported TEE at a higher rate,” Henriksen and colleagues wrote.³

Miwa 2026: Ring 3 next to an Apple Watch

The newest data comes from 36 Japanese office workers tracked for three weeks. Oura Ring 3’s active calories came in 16.9% below an ActiGraph research monitor, while an Apple Watch Series 6 came in 25.9% above it.⁴

The catch is size: only five people wore the Oura Ring, and the authors say its results “should be interpreted with caution due to the small sample size.”⁴

Does Oura overestimate or underestimate calories burned?

Whether Oura overestimates calories depends on which number you look at. During hard exercise it tends to underestimate: in the lab it read 20% low at a 15 km/h run. For Total Burn across a whole day, it read higher than hip-worn monitors in both free-living studies, plausibly because its resting estimate runs high.¹³

Put the evidence side by side and a pattern appears:

• Hard efforts: under. The faster participants ran, the further Oura fell below calorimetry, from −0.17 MET at 9 km/h to −3.49 MET at 15 km/h.¹
• Easy movement: close on average. Slow walking and light tasks averaged within about 0.3 MET of calorimetry (−0.27 to +0.18), though the average error per activity still ran 7% to 24%.¹
• Total Burn: often over. It came in +148 kcal/day (Henriksen) and +796 to +817 kcal/day (Kristiansson) against hip and thigh monitors, but only −54 kcal/day against a wrist monitor.¹³
• Active calories: mixed. Above hip and thigh monitors in the Gen 2 study, below a wrist monitor there, and 17% below an ActiGraph in the Ring 3 study.¹⁴

The researchers’ explanation for the high totals is the resting estimate. Their participants’ measured resting metabolism averaged 1,485 kcal a day, and they judged it “plausible” that Oura’s calculated resting rate was higher.¹ Since resting burn is most of Total Burn, a small error there moves the whole day.

There’s also a reason Oura numbers can look different in other apps that has nothing to do with accuracy. Oura sends Apple Health only “activity burn calories, excluding your Basal Metabolic Rate (BMR).”⁸ An app that adds its own resting estimate will show a different total than the Oura app does.

Is Oura’s Total Burn accurate?

Oura’s Total Burn is the least verifiable number in the app. Most of it is an estimated resting burn from a formula Oura doesn’t publish. In the Gothenburg study it came within 54 kcal/day of a wrist monitor but ran 796 to 817 kcal/day above hip and thigh monitors on the same people.¹⁶

Read that range carefully. It doesn’t mean Oura is 800 calories wrong. It means the references disagree with each other as much as they disagree with the ring, so no free-living study can pin Oura’s true error to a single number.

What you can trust is the day-to-day direction. If your Total Burn is 300 calories higher on your long-run day than on your rest day, something real happened. Whether the true gap was 250 or 350 is beyond what the ring can tell you.

Is Oura Ring 4 or Ring 5 calorie burn more accurate?

No published study has measured calorie burn on Oura Ring 4, Ring 4 Ceramic or Ring 5, so nobody knows yet. Every calorie validation on PubMed used Gen 2 or Ring 3. Ring 5, which began shipping in June 2026, will “still have the same level of sensing, tracking and accuracy as the previous generation,” Oura told CNBC.⁹

Here is where each model stands as of October 2026:

Model	Released	Launch price (US)	Calorie validation
Gen 2	Earlier generation	—	Kristiansson 2023, Henriksen 202213
Ring 3 (Gen 3)	Earlier generation	—	Miwa 2026, 5 users4
Ring 4	October 2024	$349	None published10
Ring 4 Ceramic	October 2025	$499	None published11
Ring 5	June 2026	$399 (premium finishes $499)	None published9

Membership runs $5.99 a month or $69.99 a year in the US.¹²

Two things changed after the studies were run, and they pull in different directions. Workout calories now depend on heart rate, which should help on intense sessions.⁷ But ring heart rate is a weak spot: in a 2026 test of ten wearables across rest, a stress task and treadmill walking, the Oura (Gen 3) had a median heart-rate error of 15.0% and read 7.1 bpm low on average against a chest-strap ECG, among the weakest of the ten.¹³ No study has tested Oura heart rate during hard exercise. If heart rate reads low during a workout, the calories built on it may too. That link is our inference; no study has tested it.

Is Oura, Apple Watch or Garmin more accurate for calories?

No study has compared Oura’s calorie estimates with Apple Watch’s or Garmin’s in a lab on the same people, so there’s no clean winner. In one free-living comparison, Oura Ring 3 read 16.9% below a research monitor and Apple Watch 25.9% above it. Apple Watch’s calorie error exceeded 10% in every subgroup of a 56-study review.⁴¹⁴

Garmin has the same problem. A review of 12 Garmin studies found calorie accuracy “exceeded acceptable limits.”¹⁵ In a 2026 cycling test, a Garmin Forerunner 955 overestimated a 20-minute recumbent-cycling session (10 minutes of intervals plus rest and recovery) by about 69 kcal, against about 22 kcal for an Apple Watch Series 8.¹⁶

Device	Best evidence on calories	Direction	How well studied
Oura Ring (Gen 2, Ring 3)	21.1% lab error; −16.9% active calories free-living14	Under on hard efforts; Total Burn often over	3 studies
Apple Watch	Every subgroup above 10% error across 56 studies14	Usually over	Dozens of studies
Garmin	Variable, “exceeded acceptable limits” across 12 studies15	Over in a 2026 cycling test16	About a dozen studies

The device isn’t really the problem. A wrist or a finger can measure your heart rate and your movement; neither can measure your oxygen use. Stanford’s 2017 benchmark found no device with a calorie error under 20%.¹⁷ “The heart rate measurements performed far better than we expected,” said senior author Euan Ashley, a professor of cardiovascular medicine at Stanford, “but the energy expenditure measures were way off the mark.”¹⁸

Is Oura accurate for strength training and cycling calories?

Oura’s strength training and cycling calories are the least certain numbers it gives you, because no Oura calorie study has tested either activity, and watches fail at both. In one lab study, no wrist device produced valid calorie estimates during cycling or resistance exercise.¹⁹¹

Oura itself says manually adding activities that are hard to measure “can improve the accuracy of your Activity Score.”⁵ For a lifting session, that means confirming the detected workout or adding it yourself, and accepting that its calorie figure is an estimate built from activity type, duration and intensity (heart rate for a detected workout, your own easy/moderate/hard choice for one you add), not a measurement of the work you did.

How can you make Oura’s calorie numbers more accurate?

To make Oura’s calorie numbers more accurate, keep your profile current, wear the ring correctly, confirm every detected workout, and keep Activity Heart Rate on. Your age, height, weight and sex likely drive Oura’s resting estimate, and heart rate sets workout intensity. If Oura is linked to Apple Health, update your weight there.¹⁸²⁰²¹

1. Update your weight where Oura reads it. If you link Apple Health, “your height, weight, age, and sex will be imported from those apps into Oura, and you will not be able to edit them unless you unlink the apps.”⁸
2. Turn the ring so its sensors face your palm. For rings with sensor bumps, Oura recommends putting them on the palm side “for more accurate activity tracking.”⁵
3. Confirm or edit each detected workout. Automatic detection needs at least 10 minutes of activity, and Oura says that “as you confirm more activities over time, your detected workouts and their details will become more precise.”²¹
4. Leave Activity Heart Rate on and set your max heart rate. With the toggle off, detected activities lose heart rate and default to moderate intensity. You can also set your max heart rate in Settings, Activity, which Oura says makes your heart rate zones more accurate; it doesn’t say whether this changes calories.²⁰⁷⁵
5. Add what the ring missed. Oura recommends adding activities manually if you didn’t wear it, choosing easy, moderate or hard yourself.⁵
6. Compare your days, not your devices. Oura recommends “analyzing your data through one device instead of making comparisons between different devices.”⁵

If calorie numbers stress you more than they help, Oura lets you switch the activity goal to steps or hide calories with “Calorie opt out.”²²

Should you eat back the calories Oura says you burned?

You shouldn’t eat back all the calories Oura says you burned. Even a perfect calorie reading overstates what extra exercise adds to your day, because the body compensates. A study of 1,754 adults found only about 72% of extra activity calories showed up in total daily burn. Add Oura’s own estimation error, and eating back every calorie risks overshooting.²³²⁴

Herman Pontzer, an evolutionary anthropologist at Duke University who studies human energy expenditure, put it bluntly: “You’re never going to run off your Krispy Kremes.”²⁵ His 2026 review found that in aerobic exercise programs, total daily energy expenditure rose by only about 30% of what a simple add-it-up model predicts.²⁴

A better approach is to set intake from your bodyweight and goal, then adjust by what the scale does over two to three weeks. SensAI’s guide to how many calories you should eat walks through that. Use Oura’s number for trends: was this week more active than last?

How does Oura’s calorie data reach SensAI?

SensAI doesn’t connect to Oura directly. It reads Apple Health, which the Oura app writes to. Oura shares sleep with stages, heart rate at one-minute intervals, active energy, steps, respiratory rate and workouts, including detected ones. It does not share HRV or resting heart rate.²⁶

That shapes what SensAI can see. Your Oura workouts appear next to your planned sessions, so the Coach builds next week around a hard ride or a missed run instead of guessing. Sleep and overnight heart rate from your ring shape how hard the Coach asks you to push on a given day. HRV reaches SensAI only from an Apple Watch, and Oura’s Readiness score never crosses into Apple Health.²⁶

To check that your ring’s data is flowing, follow our Help Center guide to connecting a wearable to SensAI through Apple Health. For what each brand shares, see what syncs from Oura, WHOOP and Garmin.

SensAI won’t make your ring’s calorie estimate more accurate, and we’d rather say so. What it does is read your Oura workouts, sleep and overnight heart rate through Apple Health and plan your week around them.

Frequently asked questions

How accurate is the Oura Ring for calories burned?

In the only lab test, Oura tracked changes in effort closely (r = 0.93) but missed by 21.1% on average, reading low at running speeds. In everyday life its Total Burn came out 148 to 817 kcal/day above hip- and thigh-worn reference monitors and 54 kcal/day below a wrist monitor.¹²³

Does the Oura Ring overestimate calories?

Oura’s Total Burn tended to read higher than hip-worn research monitors in both free-living studies (and a thigh monitor in one), plausibly because its undisclosed resting estimate runs high. During hard exercise it does the opposite and underestimates: about 20% low at a 15 km/h run.¹³

Is Oura Total Burn accurate?

Total Burn is mostly an estimated resting burn, from a formula Oura doesn’t publish, plus activity. It can’t be verified closely: against a wrist monitor it was within 54 kcal/day, against hip and thigh monitors 796 to 817 kcal/day higher. Use it to compare your own days, not as an exact figure.¹⁶

Is Oura Ring 5 calorie burn accurate?

No study has measured calories on Oura Ring 5, Ring 4 or Ring 4 Ceramic. Oura says Ring 5 keeps the previous generation’s sensing and accuracy. All published calorie data comes from Gen 2 and Ring 3.⁹¹⁴

Is Oura or Apple Watch more accurate for calories?

There’s no head-to-head lab test of their calorie estimates. In one free-living study Oura Ring 3 read 16.9% low and Apple Watch Series 6 25.9% high against the same type of research monitor, but only five people wore the ring. Neither is accurate enough to count calories precisely.⁴¹⁴

Is Oura or Garmin more accurate for calories?

No study has compared their calorie estimates directly. Garmin’s calorie estimates “exceeded acceptable limits” across 12 studies and overestimated cycling in a 2026 test; Oura’s only lab test found a 21.1% average error. Both are estimates.¹⁵¹⁶¹

Why are my Oura calories different in Apple Health?

Oura sends Apple Health only its active calories, “excluding your Basal Metabolic Rate (BMR),” while the Oura app’s Total Burn includes resting burn. Apps that add their own resting estimate will show a different total.⁸

Does Oura count strength training calories?

Yes, if the workout is detected or added, from activity type, duration and intensity (heart-rate-based for detected or recorded workouts, your own easy/moderate/hard choice for manually added ones). But no study has validated Oura during strength training, and wrist devices fail at it too, so treat lifting calories as a rough estimate.⁵¹⁹

The bottom line

Oura’s calorie numbers are good at one thing: telling you whether today was more or less active than yesterday. They are not good at telling you exactly how many calories you burned, and nothing on your finger or wrist is yet.

• Trust the trend, not the total. Oura tracked effort with r = 0.93 in the lab but missed by 21% on average.¹²
• Expect hard runs to read low and Total Burn to read high against hip-worn monitors.¹³
• Ring 4 and Ring 5 are untested for calories. Anyone quoting an accuracy figure for them is quoting an older ring.
• Don’t eat back every calorie. The body compensates for part of what you burn.²³
• Use calories as one signal, not the scoreboard. Your workouts, heart rate and sleep say more about how your training is going.

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References

Footnotes

1. Kristiansson E, Fridolfsson J, Arvidsson D, Holmäng A, Börjesson M, Andersson-Hall U. “Validation of Oura ring energy expenditure and steps in laboratory and free-living.” BMC Medical Research Methodology, 2023; 23(1): 50. https://pubmed.ncbi.nlm.nih.gov/36829120/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷

2. Kristiansson E, Fridolfsson J, Arvidsson D, Holmäng A, Börjesson M, Andersson-Hall U. “Correction: Validation of Oura ring energy expenditure and steps in laboratory and free-living.” BMC Medical Research Methodology, 2023; 23(1): 203. https://pubmed.ncbi.nlm.nih.gov/37689635/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷

3. Henriksen A, Svartdal F, Grimsgaard S, Hartvigsen G, Hopstock LA. “Polar Vantage and Oura Physical Activity and Sleep Trackers: Validation and Comparison Study.” JMIR Formative Research, 2022; 6(5): e27248. https://pubmed.ncbi.nlm.nih.gov/35622397/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

4. Miwa T, Mii K, Chatani R, Sugitani Y. “Comparison of consumer-grade wearable devices with a research-grade instrument for measuring physical activity in a free-living setting.” PLoS One, 2026; 21(2): e0342543. https://pubmed.ncbi.nlm.nih.gov/41729926/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

5. Oura. “How Oura Measures Steps & Activity.” Oura Help, last updated October 14, 2026. https://support.ouraring.com/hc/en-us/articles/360025576833-How-Oura-Measures-Steps-Activity ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰

6. Oura. “Glossary.” Oura Help, last updated October 1, 2026. https://support.ouraring.com/hc/en-us/articles/5949130374547-Glossary ↩ ↩² ↩³ ↩⁴ ↩⁵

7. Oura. “All-New Updates to Oura’s Activity Features.” The Pulse Blog, May 21, 2025. https://ouraring.com/blog/activity-improvements/ ↩ ↩² ↩³ ↩⁴

8. Oura. “Apple Health Integration.” Oura Help, last updated October 14, 2026. https://support.ouraring.com/hc/en-us/articles/360025438734-Apple-Health-Integration ↩ ↩² ↩³ ↩⁴

9. CNBC. “Oura is launching its smallest smart ring yet, shrinking wearable design by 40%.” May 28, 2026. https://www.cnbc.com/2026/05/28/oura-ring-smallest-wearable-health-fitness.html ↩ ↩² ↩³

10. CNBC. “Oura Ring 4 smart ring announced for $349, releases Oct. 15.” October 3, 2024. https://www.cnbc.com/2024/10/03/oura-ring-4-price-release-date.html ↩

11. Malik A. “Oura launches Ring 4 Ceramic collection, new charging case, and a ‘health panel’ feature.” TechCrunch, October 1, 2025. https://techcrunch.com/2025/10/01/oura-launches-ring-4-ceramic-collection-new-charging-case/ ↩

12. Oura. “Oura Ring Membership.” Accessed October 22, 2026. https://ouraring.com/membership ↩

13. Gielen J, Van Oost CN, Debard G, Sels R, De Witte NAJ, Colman T, Bonroy B, Aerts JM. “Accuracy of Optical Heart Rate Measurements for 10 Commercial Wearables in Different Climate Conditions and Activities: Instrument Validation Study.” JMIR Formative Research, 2026; 10: e85186. https://pubmed.ncbi.nlm.nih.gov/41701929/ ↩

14. Choe JP, Kang M. “Apple watch accuracy in monitoring health metrics: a systematic review and meta-analysis.” Physiological Measurement, 2025; 46(4). https://pubmed.ncbi.nlm.nih.gov/40199339/ ↩ ↩² ↩³

15. Evenson KR, Spade CL. “Review of Validity and Reliability of Garmin Activity Trackers.” Journal for the Measurement of Physical Behaviour, 2020; 3(2): 170-185. https://pubmed.ncbi.nlm.nih.gov/32601613/ ↩ ↩² ↩³

16. Kostrna J, Oparina E, Palacios C, Rodriguez AJ, Pei J, Ajmal A, Ramella-Roman JC. “Body fat, skin tone, and the accuracy of smartwatch caloric expenditure estimates.” PLoS One, 2026; 21(7): e0353261. https://pubmed.ncbi.nlm.nih.gov/42525581/ ↩ ↩² ↩³

17. Shcherbina A, Mattsson CM, Waggott D, Salisbury H, Christle JW, Hastie T, Wheeler MT, Ashley EA. “Accuracy in Wrist-Worn, Sensor-Based Measurements of Heart Rate and Energy Expenditure in a Diverse Cohort.” Journal of Personalized Medicine, 2017; 7(2): 3. https://pubmed.ncbi.nlm.nih.gov/28538708/ ↩

18. Dusheck J. “Fitness trackers accurately measure heart rate but not calories burned.” Stanford Medicine News Center, May 24, 2017. https://med.stanford.edu/news/all-news/2017/05/fitness-trackers-accurately-measure-heart-rate-but-not-calories-burned.html ↩

19. Boudreaux BD, Hebert EP, Hollander DB, Williams BM, Cormier CL, Naquin MR, Gillan WW, Gusew EE, Kraemer RR. “Validity of Wearable Activity Monitors during Cycling and Resistance Exercise.” Medicine and Science in Sports and Exercise, 2018; 50(3): 624-633. https://pubmed.ncbi.nlm.nih.gov/29189666/ ↩ ↩²

20. Oura. “Activity Heart Rate.” Oura Help, last updated October 14, 2026. https://support.ouraring.com/hc/en-us/articles/6321008135699-Activity-Heart-Rate ↩ ↩²

21. Oura. “Automatic Activity Detection.” Oura Help, last updated October 14, 2026. https://support.ouraring.com/hc/en-us/articles/360063022993-Automatic-Activity-Detection ↩ ↩²

22. Oura. “Edit Activity Goal.” Oura Help, last updated October 14, 2026. https://support.ouraring.com/hc/en-us/articles/8945980160659-Edit-Activity-Goal ↩

23. Careau V, Halsey LG, Pontzer H, et al. “Energy compensation and adiposity in humans.” Current Biology, 2021; 31(20): 4659-4666.e2. https://pubmed.ncbi.nlm.nih.gov/34453886/ ↩ ↩²

24. Pontzer H, Trexler ET. “The evidence for constrained total energy expenditure in humans and other animals.” Current Biology, 2026; 36(4): 1013-1025.e4. https://pubmed.ncbi.nlm.nih.gov/41653928/ ↩ ↩²

25. Duke Today. “Living Like a Caveman Won’t Make You Thin. But it Might Make You Healthy.” January 17, 2019. https://today.duke.edu/2019/01/living-caveman-won%E2%80%99t-make-you-thin-it-might-make-you-healthy ↩

26. SensAI Help Center. “How to Connect Garmin, Oura, WHOOP, Strava, or Any Wearable to SensAI Through Apple Health.” Last updated September 25, 2026. https://www.sensai.fit/help/connect-wearable-to-sensai-apple-health ↩ ↩²