From: Validation of Oura ring energy expenditure and steps in laboratory and free-living
MET output | Correlation r | Bias | Error | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Activity | Sensor | n | Mean | ±SD | Mean | ±SD | Mean | ±SD | p | 95% Limits of Agreement | MAPE | |
Upper | Lower | |||||||||||
Laboratory | ||||||||||||
Combined activities | Oura | 183 | 5.0 | 4.4 | 0.93 | 0.14 | −0.4 | 2.25 | 0.02 | 4.03 | −4.79 | 21.1% |
IC | 183 | 5.4 | 4.8 | |||||||||
1.Sitting | Oura | 28 | 1.13 | 0.13 | −0.12 | 0.28 | 0.04 | 0.44 | −0.67 | 6.6% | ||
IC | 28 | 1.25 | 0.26 | |||||||||
2.Standing | Oura | 28 | 1.06 | 0.35 | −0.27 | 0.33 | < 0.001 | 0.374 | −0.921 | 16.3% | ||
IC | 28 | 1.34 | 0.20 | |||||||||
3.Books | Oura | 28 | 2.30 | 0.88 | 0.11 | 0.85 | 0.48 | 1.78 | −1.56 | 24.1% | ||
IC | 28 | 2.18 | 0.41 | |||||||||
4.Walk – slow | Oura | 28 | 4.38 | 0.73 | 0.18 | 0.97 | 0.35 | 2.07 | −1.72 | 18.8% | ||
IC | 28 | 4.20 | 0.82 | |||||||||
4.Walk – fast | Oura | 28 | 5.41 | 1.38 | −0.82 | 1.92 | 0.03 | 2.93 | −4.57 | 19.3% | ||
IC | 28 | 6.23 | 1.46 | |||||||||
5.Run – slow | Oura | 26 | 10.48 | 3.49 | −0.17 | 3.81 | 0.83 | 7.29 | −7.62 | 29.9% | ||
IC | 26 | 10.65 | 1.83 | |||||||||
5.Run – fast | Oura | 10 | 12.49 | 3.19 | −1.11 | 4.35 | 0.44 | 7.42 | −9.65 | 25.7% | ||
IC | 10 | 13.60 | 2.76 | |||||||||
5.Run – very fast | Oura | 9 | 13.70 | 2.69 | −3.49 | 3.94 | 0.03 | 4.23 | −11.21 | 20.7% | ||
IC | 9 | 17.19 | 3.27 | |||||||||
Free-Living | ||||||||||||
MET | Oura | 389 | 1.66 | 0.35 | ||||||||
Hip | 389 | 1.42 | 0.32 | 0.79 | 0.29 | 0.24 | 0.16 | < 0.001 | 0.55 | −0.07 | 18.2% | |
Thigh | 393 | 1.40 | 0.33 | 0.81 | 0.19 | 0.26 | 0.16 | < 0.001 | 0.57 | −0.06 | 20.2% | |
Wrist | 388 | 1.99 | 0.39 | 0.80 | 0.24 | −0.34 | 0.19 | < 0.001 | 0.03 | −0.71 | 17.2% | |
TEE (Kcal) | Oura | 389 | 2883 | 637 | ||||||||
Hip | 389 | 2087 | 595 | 0.79 | 0.25 | 796 | 362 | < 0.001 | 1506 | 85 | 42.2% | |
Thigh | 393 | 2066 | 621 | 0.78 | 0.23 | 817 | 375 | < 0.001 | 1551 | 82 | 44.7% | |
Wrist | 388 | 2932 | 794 | 0.76 | 0.26 | − 54 | 494 | 0.03 | 913 | − 1022 | 13.0% | |
AEE (Kcal) | Oura | 389 | 760 | 554 | ||||||||
Hip | 389 | 523 | 422 | 0.81 | 0.26 | 238 | 262 | < 0.001 | 751 | − 276 | 68.1% | |
Thigh | 393 | 500 | 451 | 0.81 | 0.20 | 259 | 263 | < 0.001 | 774 | − 255 | 89.5% | |
Wrist | 388 | 1241 | 562 | 0.79 | 0.24 | −487 | 346 | < 0.001 | 192 | − 1166 | 46.2% | |
Steps | Oura | 389 | 13,446 | 7374 | ||||||||
Pedometer | 389 | 11,322 | 7779 | 0.77 | 0.29 | 2124 | 4256 | < 0.001 | 10,466 | − 6217 | 50.3% |