Table 3.
Vastus medialis electromyographic variables in response to sprint exercise performed at the end of an incremental exercise to exhaustion in normoxia and severe hypoxia (PIO2 ≈ 73 mmHg), after 10 or 60 s of occlusion of the circulation.
| Control sprint | Nx10s | Nx60s | Hyp10s | Hyp60s | Main Oxy (P) | Main Occ (P) | Interaction Oxy × Occ (P) | |
|---|---|---|---|---|---|---|---|---|
| RMSraw (μV) | 263.5±115.7b,c,e | 177.4±95.0d | 193.9±121.3 | 204.2±103.1 | 183.9±81.1 | 0.333 | 0.943 | 0.038 |
| RMSNz (A.U.) | 410.4±163.3a | 284.0±97.1d | 276.4±126.1 | 333.0±143.1 | 279.7±104.8d | 0.078 | 0.137 | 0.098 |
| Burst (ms) | 342.2±27.7b | 309.4±42.5c | 355.2±49.4d | 322.0±53.1 | 347.8±37.9b | 0.743 | 0.017 | 0.154 |
| TAINz (A.U.) | 1152.1±463.3a | 701.1±359.9d | 809.0±498.6 | 829.7±397.9 | 820.7±335.6 | 0.118 | 0.638 | 0.119 |
| MPF (Hz) | 94.3±9.9b,c,d | 81.9±14.0 | 79.8±15.8 | 85.8±19.2 | 89.4±17.4 | 0.008 | 0.703 | 0.241 |
| MdPF (Hz) | 80.8±6.7a | 66.2±9.2 | 67.1±13.4 | 71.3±16.6 | 74.6±14.1b,c | 0.011 | 0.218 | 0.587 |
P < 0.05 compared with the other conditions.
P < 0.05 compared with Nx10s.
P < 0.05 compared with Nx60s.
P < 0.05 compared with Hyp10s.
P < 0.05 compared with Hyp60s.
RM ANOVA (2 × 2) Main Oxy, main oxygenation effect due to the conditions in which was performed the incremental exercise test (Nx, Normoxia; Hyp, hypoxia); RM ANOVA (2 × 2) Main Occ, Main Occlusion effect due to the duration of the occlusion (10 vs. 60 s); RMSraw, raw root mean square; RMSNz, Normalized root mean square; Burst, burst duration; TAINz, Normalized total activation index (arbitrary units, A.U.); MPF, mean power frequency; MdPF, median power frequency.