TABLE 2.
Z‐score resting heart rate comparisons.
| Statistic | Oura Gen 3 | Oura Gen 4 | Polar Grit X Pro | WHOOP 4.0 |
|---|---|---|---|---|
| Mean absolute error | 0.15 ± 0.17 c , d | 0.16 ± 0.24 d | 0.23 ± 0.30 a , d | 0.29 ± 0.37 a , b |
| CCC | 0.97 | 0.98 | 0.92 | 0.88 |
a
Significantly different from Oura Gen 3.
b
Significantly different from Oura Gen 4.
c
Significantly different from Polar Grit X Pro.
d
Significantly different from WHOOP 4.0. Garmin Fenix 6 omitted due to reporting timestamp of RHR calculation, preventing alignment with Polar H10 data.