Oura Ring Series
Which activity metrics actually matter? 28,000+ days analysed
Smart rings track five different activity metrics, but they don't always align. Drawing on nearly 28,000 days of user da...
October 9, 2025
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All research articles
Here you can find all articles published by the Terra Research team. All articles consist of original findings.
Oura Ring Series
Burn More Calories, Sleep Like a Log?
An analysis of 1,000+ Oura ring users examined the relationship between daily calorie expenditure and sleep metrics. Act...
October 2, 2025
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Oura Ring Series
GAMM analysis – can complexity tell us anything we don’t already know?
Based on an analysis of nearly 90,000 nights, the connection between sleep duration and next-morning HRV is minimal for...
September 25, 2025
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Oura Ring Series
Think a good HRV score follows a good night’s sleep? Think again!
Despite their perceived link, sleep and HRV are only weakly correlated. The analysis of nearly 90,000 nights showed that...
September 20, 2025
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Oura Ring Series
Descriptive HRV using Z scores
Based on an analysis of nearly 100,000 HRV records, this report reveals that most daily HRV changes are small, but large...
September 19, 2025
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Oura Ring Series
Why Mondays Might Be Your Healthiest Day: What 1,000+ Sleepers Taught Us About Recovery
At Terra, we recently ran an analysis on wearable data from over a thousand (Oura) users, focusing on two key metrics: s...
September 18, 2025
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