| Biochemical measures | Pre-race | Post-race | At 1 week |
| Heart rate (bpm) | 51 (8) | 72 (11)‡ | 53 (8) |
| Weight (kg) | 72.6 (8.5) | 71.4 (8.6)† | |
| Hb (g/l) | 141 (10.4) | 146.8 (12.2) | 141.5 (9.1) |
| Cr (mmol/l) | 0.09 (0.01) | 0.12 (0.03)‡ | 0.08 (0.01) |
| CK (U/l) | 196 (110) | 1734 (1352)‡ | 527 (1005) |
| CKMB (U/l) | 16.6 (7.7) | 80.4 (59.1)‡ | 24.5 (19.7) |
| Log10 cTnI | −0.79 (0.12) | −0.54 (0.37)‡ | −0.82 (0) |
| cTnI (subjects with >0.15 μg/l/total subjects) | 3/26 | 15/26† | 0/26 |
| Log10 BNP (ng/l) | 0.99 (0.26) | 1.49 (0.30)‡ | 1.07 (0.32) |
Results are shown as mean (SD).
†p<0.01; ‡p<0.001.
BNP, B type natriuretic peptide; CK, creatine kinase; CKMB, creatine kinase MB isoform; Cr, serum creatinine; cTnI, cardiac troponin I; Hb, haemoglobin.