Changes in physiological and metabolic variables during a 180 minute ride at ∼60% of maximal oxygen uptake with (F) and without (NF) fluid ingestion
| Variable | F | NF |
|---|---|---|
| Values are mean (SD). | ||
| *Significantly different from values obtained before exercise: p<0.05. | ||
| †Significantly different from values obtained with fluid ingestion: p<0.05. | ||
| ‡Interaction effect : p<0.05. | ||
| Body mass (kg) | ||
| Before | 73.7 (10.0) | 73.8 (10.2) |
| After | 72.1 (10.1)* | 70.8 (10.4)‡ |
| Rectal temperature (°C) | ||
| Before | 37.1 (0.1) | 37.3 (0.2) |
| After | 37.6 (0.3)* | 37.9 (0.3)* |
| Urine osmolarity (mosmol/l) | ||
| Before | 584 (225) | 702 (213) |
| After | 399 (175) | 779 (117)† |
| Oxygen uptake (l/min) | ||
| Beginning | 2.63 (0.52) | 2.66 (0.38) |
| End | 2.76 (0.45) | 2.86 (0.43)* |
| Respiratory exchange ratio | ||
| Beginning | 0.89 (0.04) | 0.90 (0.07) |
| End | 0.79 (0.06)* | 0.80 (0.05)* |
| Heart rate (beats/min) | ||
| Beginning | 127 (13) | 127 (10) |
| End | 135 (15) | 149 (17)* |
| Physiological strain index | 4.2 (0.8) | 5.2 (1.1)† |