Body mass, per cent change in body mass, haematocrit, blood volume change, serum osmolality and serum sodium measured at various phases of the experiment
| Variable | Treatment | Pre-DHY | Post-DHY | Pre-TT | Post-TT |
|---|---|---|---|---|---|
| Body mass (kg) | EUH | 81.64±5.87 | 78.83±5.73 | 81.63±5.88*† | 81.65±5.86*† |
| −2% | 81.28±5.86 | 78.49±5.73 | 79.60±5.79‡ | 79.58±5.73‡ | |
| −3% | 81.42±6.49 | 78.63±6.34 | 78.97±6.29 | 79.03±6.32 | |
| Change in body mass (%) | EUH | – | −3.45±0.31 | 0.02±0.08*† | 0.01±0.15*† |
| −2% | – | −3.43±0.29 | −2.07±0.11‡ | −2.08±0.20‡ | |
| −3% | – | −3.43±0.38 | −3.00±0.02 | −2.93±0.28 | |
| Haematocrit (%) | EUH | 43.6±1.3 | 46.5±1.4 | 39.7±1.1† | 39.9±1.9† |
| 2% | 43.2±2.0 | 46.8±1.7 | 42.5±2.3 | 42.4±1.8 | |
| 3% | 43.4±1.9 | 46.0±2.2 | 43.5±2.2 | 42.6±2.0 | |
| Δ Blood volume (%) | EUH | – | −6.9±2.9 | 16.9±3.7*† | −0.3±4.6 |
| 2% | – | −7.6±2.9 | 10.4±4.2‡ | 0.1±4.2 | |
| 3% | – | −5.5±4.8 | 5.6±2.8 | 2.1±2.5 | |
| Serum osmolality (mOsmol/kg) | EUH | 289±3 | 298±4 | 299±3 | 307±5 |
| 2% | 290±4 | 298±7 | 300±5 | 310±7 | |
| 3% | 290±3 | 299±4 | 300±4 | 308±4 | |
| Serum sodium (mEq/L) | EUH | 141±2 | 145±2 | 145±1 | 147±2 |
| 2% | 141±2 | 145±2 | 145±1 | 149±2 | |
| 3% | 141±2 | 144±2 | 145±1 | 148±2 |
*Significant difference between EUH and −2% trials.
†Significant difference between EUH and −3% trials.
‡Significant difference (p<0.05) between −2% and −3% trials.
DHY, dehydration; EUH, euhydration; TT, time trial.