Table 2.
Effects of endurance training and intermittent hypoxia on hemodynamic, respiratory, and neural parameters
| Pretraining (n = 11) |
Posttraining (n = 11) |
|||
|---|---|---|---|---|
| Pre-IH | Post-IH | Pre-IH | Post-IH | |
| Mean BP, mmHg | 85 ± 2 | 86 ± 2* | 83 ± 2† | 84 ± 2 |
| HR, beats/min | 67 ± 3 | 63 ± 3* | 61 ± 2† | 60 ± 2 |
| Minute ventilation, l/min | 7.66 ± 0.36 | 7.59 ± 0.41 | 7.28 ± 0.39 | 7.98 ± 0.55 |
| Respiratory frequency, breaths/min | 11 ± 1 | 13 ± 1 | 12 ± 1 | 14 ± 1 |
| Tidal volume, liters | 0.69 ± 0.06 | 0.61 ± 0.06 | 0.70 ± 0.12 | 0.60 ± 0.05 |
| End-tidal CO2, mmHg | 40.7 ± 0.8 | 37.9 ± 0.6* | 40.1 ± 0.5 | 37.5 ± 0.7* |
| SpO2, % | 98 ± 0.2 | 97 ± 0.3* | 97 ± 0.2 | 97 ± 0.2 |
| Chemoreflex slope, l·min−1·% O2 desaturation−1 | 0.261 ± 0.032 | 0.305 ± 0.032* | 0.290 ± 0.044 | 0.262 ± 0.036 |
| MSNA burst rate, bursts/min (n = 6) | 16 ± 3 | 23 ± 5* | 15 ± 3 | 20 ± 2 |
Data are expressed as means ± SE; n, number of subjects. IH, intermittent hypoxia; SpO2, arterial O2 saturation; MSNA, muscle sympathetic nerve activity.
*
P < 0.05 pre-IH vs. post-IH.
†
P < 0.05 Pretraining vs. Posttraining.