Table 4.
Results of trend tests between heart rate variability items and occupational physical activity according to combined category of age and exercise
| SDNN | rMSSD | LF | HF | LF:HF | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Age (year) | Exercise (frequency / week) |
OPA | low | normal | low | normal | low | normal | low | normal | low | normal | ||||||||||
| n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | n | % | |||
| < 45 | ≥3 | Low | 4 | 23.5 | 13 | 76.5 | 0 | 0.0 | 17 | 100.0 | 5 | 29.4 | 12 | 70.6 | 1 | 5.9 | 16 | 94.1 | 6 | 35.3 | 11 | 64.7 |
| High | 1 | 10.0 | 9 | 90.0 | 0 | 0.0 | 10 | 100.0 | 2 | 20.0 | 8 | 80.0 | 0 | 0.0 | 10 | 100.0 | 5 | 50.0 | 5 | 50.0 | ||
| p-value | 0.1911 | na | 0.2950 | 0.2172 | 0.2263 | |||||||||||||||||
| 1–2 | Low | 7 | 18.0 | 32 | 82.1 | 3 | 7.7 | 36 | 92.3 | 9 | 23.1 | 30 | 76.9 | 5 | 12.8 | 34 | 87.2 | 11 | 28.2 | 28 | 71.8 | |
| High | 3 | 21.4 | 11 | 78.6 | 0 | 0.0 | 14 | 100.0 | 3 | 21.4 | 11 | 78.6 | 0 | 0.0 | 14 | 100.0 | 6 | 42.9 | 8 | 57.1 | ||
| p-value | 0.3876 | 0.1427 | 0.4497 | 0.0796 | 0.1568 | |||||||||||||||||
| 0 | Low | 4 | 26.7 | 11 | 73.3 | 2 | 13.3 | 13 | 86.7 | 4 | 26.7 | 11 | 73.3 | 1 | 6.7 | 14 | 93.3 | 5 | 33.3 | 10 | 66.7 | |
| High | 2 | 33.3 | 4 | 66.7 | 2 | 33.3 | 4 | 66.7 | 4 | 66.7 | 2 | 33.3 | 3 | 50.0 | 3 | 50.0 | 0 | 0.0 | 6 | 100.0 | ||
| p-value | 0.3800 | 0.1458 | 0.0441 | 0.0112 | 0.0526 | |||||||||||||||||
| ≥45 | ≥3 | Low | 2 | 25.0 | 6 | 75.0 | 0 | 0.0 | 8 | 100.0 | 3 | 37.5 | 5 | 62.5 | 1 | 12.5 | 7 | 87.5 | 4 | 50.0 | 4 | 50.0 |
| High | 2 | 100.0 | 0 | 0.0 | 2 | 100.0 | 0 | 0.0 | 2 | 100.0 | 0 | 0.0 | 2 | 100.0 | 0 | 0.0 | 1 | 50.0 | 1 | 50.0 | ||
| p-value | 0.0264 | 0.0008 | 0.0569 | 0.0079 | 0.5000 | |||||||||||||||||
| 1–2 | Low | 2 | 50.0 | 2 | 50.0 | 0 | 0.0 | 4 | 100.0 | 2 | 50.0 | 2 | 50.0 | 0 | 0.0 | 4 | 100.0 | 4 | 100.0 | 0 | 0.0 | |
| High | 2 | 66.7 | 1 | 33.3 | 1 | 33.3 | 2 | 66.7 | 2 | 66.7 | 1 | 33.3 | 1 | 33.3 | 2 | 66.7 | 0 | 0.0 | 3 | 100.0 | ||
| p-value | 0.3296 | 0.1062 | 0.3296 | 0.1062 | 0.0041 | |||||||||||||||||
| 0 | Low | 0 | 0.0 | 1 | 100.0 | 0 | 0.0 | 1 | 100.0 | 0 | 0.0 | 1 | 100.0 | 0 | 0.0 | 1 | 100.0 | 1 | 100.0 | 0 | 0.0 | |
| High | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | 0 | 0.0 | ||
| p-value | na | na | na | na | na | |||||||||||||||||
SDNN the standard deviation of normal-to-normal intervals, rMSSD the root-mean square of the difference of successive normal R-R intervals, LF low frequency band power, HF high frequency band power; LF:HF ratio of low-frequency power to high-frequency power, OPA occupational physical activity; na: not applicable