Table 1. Impact of muscle fatigue on physiological and clinical parameters (N = 11).
| Mean blood pressure (mmHg) | Respiratory quotient | %integrated electromyogram (%) |
Median power frequency (Hz) |
Deoxy-Hb in the muscle blood flow (%) |
Blood lacate concentration (mmol/L) |
Oxy-Hb in the brain blood flow (mmol*mm) |
||
| 10% MVC | Rest | 83.0 ± 7.14 | 0.88 ± 0.111 | - | 86.6 ± 21.85 | - | 1.5 ± 0.27 | - |
| Exercise | 95.0 ± 12.14* | 0.92 ± 0.165 | 19.1 ± 7.12 | 77.6 ± 23.96 | 11.6 ± 9.54 | 1.5 ± 0.35 | 0.004 ± 0.1000 | |
| 30% MVC | Rest | 82.4 ± 5.88 | 0.84 ± 0.100 | - | 93.5 ± 28.47 | - | 1.3 ± 0.29 | - |
| Exercise | 109.7 ± 11.59* | 1.06 ± 0.207* | 42.7 ± 16.15# | 59.4 ± 19.29* | 20.5 ± 14.55 | 1.5 ± 0.30* | 0.284 ± 0.3527 | |
| 50% MVC | Rest | 85.2 ± 9.64 | 0.84 ± 0.121 | - | 83.0 ± 24.44 | - | 1.2 ± 0.19 | - |
| Exercise | 120.5 ± 19.07*# | 1.39 ± 0.503*# | 72.4 ± 14.90§# | 52.2 ± 22.25*# | 31.2 ± 36.26# | 1.8 ± 0.24* | 0.872 ± 0.5731#§ | |
Values are expressed as the mean ± SD. The median power frequency values at rest were obtained at initiation of movement. The values of the oxy-Hb in the brain blood flow, %integrated electromyogram, and deoxy-Hb in the muscle blood flow are presented relative to the rest values. MVC, maximal voluntary contraction. *p < 0.05 compared with rest. #p < 0.05 compared with 10% MVC. §p < 0.05 compared with 30% MVC.