Table 4 Exercise performed and physiological parameters during 2-hour walk.
| Â | Â | Without Mask | With Mask |
|---|---|---|---|
Activity | Energy expenditure, kcals | 340 (314 – 367) | 364 (304 – 426) |
|  | Energy expenditure, METS | 3.33 (3.09 – 3.57) | 3.61 (3.12 – 4.10) |
Ambulatory blood pressure | Systolic blood pressure, mmHg | 121 (115 – 127) | 114* (108 – 120) |
|  | Diastolic blood pressure, mmHg | 81 (75 – 87) | 79 (74 – 83) |
|  | Mean arterial pressure, mmHg | 94 (89 – 99) | 90 (86 – 94) |
|  | Heart rate, bpm | 88 (82 – 94) | 91 (85 – 97) |
Heart rate variability | Data validity, % | 99.1 | 97.8 |
|  | Average NN interval, ms | 594 (562 – 627) | 613 (571 – 655) |
|  | pNN50, % | 3.3 (0.8 – 5.7) | 2.1 (-0.1 – 4.4) |
|  | RMSSD, ms | 17.2 (13.4 – 21.0) | 20.0 (15.5 – 24.6) |
|  | SDNN, ms | 45.8 (36.8 – 54.8) | 54.8 (42.5 – 67.0) |
|  | Triangular Index | 10.7 (9.1 – 12.4) | 11.4 (9.4 – 13.3) |
|  | LF-power, ms2 | 313 (170 – 455) | 414 (233 – 595) |
|  | HF-power, ms2 | 76.5 (33.6 – 120.0) | 116.8 (52.6 – 181.0) |
|  | LFn, ms | 68.2 (60.9 – 75.5) | 67.9 (61.9 – 73.9) |
|  | HFn, ms | 16.1 (11.9 – 20.3) | 16.0 (12.5 – 19.4) |
|  | HF/LF ratio | 0.259 (0.173 – 0.344) | 0.247 (0.180 – 0.314) |