Values for pre-race, immediate post-race, and 60 minute post-race serum sodium, potassium, total calcium, and total magnesium concentrations, serum osmolality, plasma glucose concentration, plasma proteins, packed cell volume, and haemoglobin results for the cramp and control groups, expressed as mean (SD) and median (1st and 3rd quartiles)
| Variable | Pre-race | Immediate post-race | 60 min post-race | |||
|---|---|---|---|---|---|---|
| Cramp (n = 21) | Control (n = 22) | Cramp (n = 21) | Control (n = 21) | Cramp (n = 13) | Control (n = 16) | |
| *Significant difference in the immediate post-race values between the cramp and control groups (p<0.05). | ||||||
| PCV, packed cell volume. | ||||||
| Mean (SD) | ||||||
| Sodium (mmol/l) | 139.2 (2.1) | 139.3 (2.0) | 139.8 (3.1)* | 142.3 (2.1)* | 140.3 (1.9) | 141.7 (1.7) |
| Potassium (mmol/l) | 4.5 (0.4) | 4.4 (0.4) | 4.9 (0.6) | 4.7 (0.5) | 4.7 (0.5) | 4.6 (0.5) |
| Calcium (mmol/l) | 2.2 (0.1) | 2.2 (0.1) | 2.3 (0.2) | 2.3 (0.1) | 2.2 (0.3) | 2.2 (0.2) |
| Magnesium (mmol/l) | 0.81 (0.1) | 0.83 (0.1) | 0.73 (0.1)* | 0.67 (0.1)* | 0.75 (0.1) | 0.73 (0.1) |
| Osmolality (mmol/kg) | 284 (5) | 282 (4) | 280 (6) | 284 (10) | 284 (7) | 283 (8) |
| Glucose (mmol/l) | 6.3 (3.1) | 6.1 (1.1) | 6.8 (1.9) | 6.5 (2.0) | 6.3 (1.0) | 6.5 (1.1) |
| Plasma proteins (g/l) | 73.3 (5.3) | 72.7 (3.9) | 76.4 (5.2) | 73.7 (15.5) | ||
| PCV (%) | 40.0 (4.0) | 42.0 (4.0) | 40.0 (3.0) | 40.0 (3.0) | ||
| Haemoglobin (g/dl) | 15.5 (1.1) | 15.5 (0.8) | 15.7 (1.0) | 15.5 (3.2) | ||
| Median (1st and 3rd quartiles) | ||||||
| Sodium (mmol/l) | 139 (138, 140) | 139 (138, 141) | 140 (139, 142)* | 143 (141, 144)* | 141 (138, 141) | 142 (141, 143) |
| Potassium (mmol/l) | 4.5 (4.2, 4.6) | 4.3 (4.2, 4.5) | 4.9 (4.5, 5.4) | 4.7 (4.5, 5.0) | 4.8 (4.2, 5.0) | 4.6 (4.3, 4.9) |
| Calcium (mmol/l) | 2.2 (2.1, 2.2) | 2.2 (2.1, 2.2) | 2.3 (2.2, 2.4) | 2.3 (2.2, 2.4) | 2.3 (2.0, 2.4) | 2.2 (2.1, 2.3) |
| Magnesium (mmol/l) | 0.8 (0.8, 0.9) | 0.8 (0.8, 0.9) | 0.8 (0.7, 0.8)* | 0.7 (0.6, 0.7)* | 0.8 (0.7, 0.8) | 0.7 (0.7, 0.8) |
| Osmolality (mmol/kg) | 284 (280, 285) | 282 (280, 286) | 280 (277, 286) | 283 (279, 291) | 284 (279, 286) | 285 (282, 287) |
| Glucose (mmol/l) | 5.3 (4.7, 6.7) | 5.8 (5.6, 7.1) | 6.5 (5.6, 7.6) | 6.7 (5.8, 8.1) | 6.3 (5.9, 7.0) | 6.6 (5.5, 7.4) |
| Plasma proteins (g/l) | 71.9 (69.6, 74.3) | 72.7 (71.1, 75.4) | 75.0 (73.3, 78.8) | 76.2 (75.0, 80.6) | ||
| PCV (%) | 40 (40, 40) | 40 (40, 40) | 40 (40, 40) | 40 (40, 40) | ||
| Haemoglobin (g/dl) | 15.4 (14.6, 16.1) | 15.7 (14.9, 16.1) | 15.6 (15.2, 16.2) | 16.2 (15.6, 16.9) | ||