Pre-race and post-race as well as absolute and relative changes in the serum sodium concentrations [Na+] and weight in the non-cramping (NC) and cramping (CR) triathletes during the Ironman triathlon
| NC group (n=166) | CR group (n=43) | p Value | |
|---|---|---|---|
| Pre-race [Na+] (mmol/l) | 139.8±1.8 (155) | 139.8±1.5 (38) | 0.982 |
| Post-race [Na+] (mmol/l) | 140.2±3.4 (124) | 139.6±2.5 (33) | 0.287 |
| Absolute change [Na+] (mmol/l) | 0.5±3.7 (124) | −0. 2±2.5 (33) | 0.298 |
| Relative change [Na+] (%) | 0.4±2.6 (124) | −0.1±1.9 (33) | 0.836 |
| Pre-race weight (kg) | 76.7±11.1 (151) | 78.1±12.1 (41) | 0.470 |
| Post-race weight (kg) | 73.9±10.6 (154) | 74.9±10.3 (40) | 0.610 |
| Absolute weight change (kg) | −2.4±1.5 (139) | −2.2±1.5 (38) | 0.362 |
| Relative weight change (%) | −3.1±1.9 (139) | −2.8±1.8 (38) | 0.252 |
Values are expressed as average±SD, with the number of subjects (n) with non-missing data in parentheses.