Table 1.
Summary statistics of heart rate variability (HRV) parameters (mean ± SD) and validity statistics (correlation) measured via Polar watch V800 and smartphone IoTool application.
| Smartphone IoTool Mean ± SD |
Polar V800 Mean ± SD |
Spearman Correlation (p Value) |
|
|---|---|---|---|
| Dairy Cow I | |||
| RR interval (ms) | 819.08 ± 21.96 | 818.08 ± 22.91 | 0.98 * (<0.001) |
| SDNN (ms) | 15.36 ± 8.31 | 14.67 ± 8.54 | 0.89 † (<0.001) |
| rMSSD (ms) | 7.82 ± 1.86 | 7.41 ± 1.77 | 0.82 † (<0.001) |
| Dairy Cow II | |||
| RR interval (ms) | 899.84 ± 42.03 | 897.41 ± 44.91 | 0.98 * (<0.001) |
| SDNN (ms) | 26.86 ± 15.15 | 26.33 ± 15.30 | 0.97 * (<0.001) |
| rMSSD (ms) | 10.15 ± 2.22 | 9.34 ± 1.96 | 0.88 † (<0.001) |
| Human control data | |||
| RR interval (ms) | 1326.13 ± 123.08 | 1324.68 ± 125.86 | 0.99 * (<0.001) |
| SDNN (ms) | 88.07 ± 43.73 | 88.50 ± 44.48 | 1.00 * (<0.001) |
| rMSSD (ms) | 73.63 ± 12.73 | 73.59 ± 12.63 | 1.00 * (<0.001) |
RR interval: distance between successive R waves; SDNN: standard deviation of all RR intervals; rMSSD: Square root of the mean of the sum of all differences between adjacent RR intervals; * good validity; † moderate validity.