Table 1.
Changes (mean±SD) in Hct and Hb, and serum concentration of sodium, potassium, magnesium and chloride before (pre), and immediately (0) and 80 min following DHR for the spring water (water) and electrolyte water (OS-1®) intake at 10 min after DHR
| Pre | 0 | 80 | ANOVA | ||
|
Hct
(%) |
Water | 47.3±2.7 | 48.2±2.1 | 47.6±1.8 | F=2.37 |
| OS-1 | 46.3±1.6 | 47.8±2.0* | 45.6±1.1 | p=0.12 | |
|
Hb
(g/dl) |
Water | 15.3±1.1 | 15.9±0.9* | 15.4±0.7 | F=2.91 |
| OS-1 | 15.5±0.8 | 16.1±0.7* | 15.1±1.2 | p=0.08 | |
|
Osmolarity
(mOsm/kg H2O) |
Water | 290.9±5.4 | 296.2±3.5* | 285.0±3.4* | F=7.73 |
| OS-1 | 292.3±5.4 | 296.2±3.5* | 294.0±2.8 | P=0.004† | |
|
Sodium
(mmol/L) |
Water | 141.7±1.5 | 142.3±1.9 | 138.4±1.7* | F=33.85 |
| OS-1 | 141.8±0.9 | 142.6±1.4 | 141.8±1.0 | P=0.001† | |
|
Potassium
(mmol/L) |
Water | 4.5±0.4 | 4.4±0.3 | 4.0±0.4* | F=1.51 |
| OS-1 | 4.5±0.4 | 4.4±0.4 | 4.2±0.4 | p=0.24 | |
|
Magnesium
(mmol/L) |
Water | 0.88±0.02 | 0.87±0.02 | 0.84±0.02* | F=1.35 |
| OS-1 | 0.88±0.04 | 0.86±0.04 | 0.85±0.05* | p=0.28 | |
|
Chloride
(mmol/L) |
Water | 101.0±1.1 | 102.6±2.3* | 99.5±2.1* | F=19.51 |
| OS-1 | 101.9±1.3 | 103.7±1.5* | 103.3±1.5* | P=0.001† |
*significant (p<0.05) difference from the prevalue.
†significant (p<0.05) difference between conditions.
DHR, downhill running; Hb, haemoglobin; Hct, haematocrit.