Table 4.
Cardiorespiratory parameters before and after long-duration spaceflight with standard of care exercise or Sprint exercise prescription.
| CON | SPRINT | |||||
|---|---|---|---|---|---|---|
| Preflight | R + 3 | R + 30 | Preflight | R + 1 | R + 30 | |
| VO2peak (L min−1) | 3.36 ± 0.19 | 3.12 ± 0.19* | 3.32 ± 0.19 | 3.22 ± 0.23 | 2.91 ± 0.23* | 3.23 ± 0.23 |
| VO2peak (mL kg−1 min−1) | 41.8 ± 1.6 | 39.7 ± 1.6* | 41.8 ± 1.6 | 41.6 ± 1.9 | 38.2 ± 1.9* | 42.0 ± 1.9 |
| Ventilatory threshold (L min−1) | 2.22 ± 0.15 | 1.97 ± 0.15* | 2.25 ± 0.15 | 2.08 ± 0.16 | 1.79 ± 0.18* | 2.00 ± 0.18 |
| Peak workload (W) | 302 ± 14 | 281 ± 14* | 304 ± 14 | 269 ± 17 | 256 ± 17* | 288 ± 17 |
| Peak heart rate (beats min−1) | 173 ± 3 | 174 ± 3 | 174 ± 3 | 178 ± 4 | 176 ± 4 | 176 ± 4 |
Data are mean ± SE and were collected approximately 50 days preflight (L-50) and 1 (Sprint) or 3 (CON) days and 30 days postflight (R + 1/R + 3 and R + 30). No group × time interaction effects were detected (P > 0.05). CON control group that performed the ISS standard of care exercise prescription, SPRINT experimental group that performed a high intensity/lower volume exercise prescription.
*Simple main effect for time relative to preflight (P < 0.05).