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Ultrahuman Science

Stay ahead with updates on our latest research and publications.

Accuracy studies

Every measurement the ring makes, and the instrument or record it was checked against. Grouped by what is measured, with the reference standard and the cohort on every study.

All areas

All 9 shown

Research publications

Sleep05 AUG 2026

The World Cup Sleep Report: What 30 match nights cost 33,513 members' sleep

Read white paper
Heart Health17 JUL 2026

Accuracy of a Smart-Ring VO2max Estimate and Five Published Prediction Equations Against Cardiopulmonary Exercise Testing: Development and Validation Study With Population-Scale Analysis

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Heart Health07 JUL 2026

Wearable-derived cardiovascular fitness age and its lifestyle correlates in 442 adults

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Sleep01 JUL 2026

Time course of perceptual, cognitive, physical and physiological responses to a single non-sleep deep rest session in physically active young adults

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Sleep22 JUN 2026

Across 211 Ring wearers, five biometric signals drift from personal baseline around a self-reported illness

Read white paper
Sleep12 MAY 2026

Pre-bed and nighttime screen use, beyond daily total, is inversely associated with sleep quality: a longitudinal study of 350,600 nights

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Ask Our Data

Every question here is one people actually ask. The answers are observational: associations, not causes. The cohort size and the reference are on every card.

Is your cholesterol test missing a number?Heart health

Is your cholesterol test missing a number?

There's a second cholesterol number, and standard panels skip it. Nearly a third of members with normal LDL had it raised.

4,841 membersa laboratory blood panel

Do hot flushes wake you up at night?Women's health

Do hot flushes wake you up at night?

A flush night is no shorter than her others, but it trades 3.79 minutes of REM and 3.01 of deep sleep for time lying awake.

809 membersthe Ultrahuman Ring

What does sleeping in at the weekend do to your heart?Sleep

What does sleeping in at the weekend do to your heart?

It's Members whose sleep drifted 24 to 34 minutes later at the weekend ran up to 0.66 bpm higher overnight the next morning.

187,796 membersthe Ultrahuman Ring

Is your resting heart rate normal for your age?Heart health

Is your resting heart rate normal for your age?

65.2% of 231,506 members sleep below the clinic’s 60 bpm line. See where yours sits for your age and sex, and when a high one deserves a look.

231,506 membersthe Ultrahuman Ring

What does a hot sauna do to your sleep?Sleep

What does a hot sauna do to your sleep?

Sleep scores rose 1.48 points on sauna nights, and deep sleep fell 3.58 minutes.

180 membersthe Ultrahuman Ring

Is your normal blood-sugar test hiding something?Metabolic health

Is your normal blood-sugar test hiding something?

Four in ten members with a normal result still spike past 140 mg/dL on an average day.

1,596 membersa laboratory blood panel and a continuous glucose monitor

Why does your recovery dip before your period?Women's health

Why does your recovery dip before your period?

Around a logged cramps day, overnight HRV climbs 3 ms and resting heart rate falls 2.7 bpm — and the cramp itself is worth less than 1 bpm of it.

19,910 membersthe Ultrahuman Ring

Is your bedroom air changing how you sleep?Environment

Is your bedroom air changing how you sleep?

On the stuffiest and most humid nights, deep sleep’s share ran about a third of a point lower — and ordinary noise hardly mattered.

1,242 membersthe Ultrahuman Home and the Ultrahuman Ring

Does an irregular bedtime raise your heart rate?Sleep

Does an irregular bedtime raise your heart rate?

It shows up, a little. The bigger deal is sleep that keeps changing length: those members ran 5.6 to 7.1 bpm higher, in every age band.

103,217 membersthe Ultrahuman Ring

Is a hidden heart risk running in your family?Heart health

Is a hidden heart risk running in your family?

It's called Lp(a), and nearly one in five members have it raised. Most of them had a clean cholesterol test.

2,473 membersa laboratory blood panel

Does magnesium actually improve your sleep?Sleep

Does magnesium actually improve your sleep?

On magnesium nights the poorest sleepers spent 4.39 fewer minutes in light sleep and 3.42 fewer awake, on a night no longer than usual. The worse your nights, the bigger the difference.

343 membersthe Ultrahuman Ring

Does your blood sugar follow you to bed?Metabolic health

Does your blood sugar follow you to bed?

The quarter of members with the most time in a tight glucose band slept with heart rates 8.3 bpm lower than the quarter with the least.

1,456 membersthe Ultrahuman Ring and a continuous glucose monitor

Does inflammation show up in your sleeping pulse?Heart health

Does inflammation show up in your sleeping pulse?

Members with the highest inflammation ran 4.3 bpm faster in their sleep.

2,788 membersa laboratory blood panel and the Ultrahuman Ring