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Table 1 Selected ECG and echocardiogram parameters recorded prior to race and within 30–60 min after the race start time are listed
| Pre-race (T0) | RI (pre-race) | Post-race (T1) | RI (post-race) | P value | |
|---|---|---|---|---|---|
| ECG | |||||
| PR interval (sec) | 0.279 (+/−0.049) | 0.211–0.381 | 0.193 (+/−0.035) | 0.146–0.259 | <0.0001 |
| QRS duration (sec) | 0.098 (+/−0.013) | 0.075–0.118 | 0.093 (+/−0.012) | 0.073–0.113 | .0789 |
| QT interval (sec) | 0.445 (+/− 0.053) | 0.355–0.567 | 0.353 (+/− 0.047) | 0.271–0.436 | <0.0001 |
| QTc interval (sec) | 0.507 (+/− 0.051) | 0.438–0.591 | 0.417 (+/− 0.024) | 0.371–0.454 | <0.0001 |
| ST segment (mV) | 1.3 (0.6,2.3) | 0.2–2.9 | 1.8 (+/−1.0) | 0.4–3.6 | 0.1115 |
| HR (bpm) | 39 (32,45) | 26–63 | 86 (69,100) | 58–126 | <0.0001 |
| Echocardiogram | |||||
| LAD Sax (cm) | 10.9 (+/−0.7) | 9.8–12.2 | 10.1 (+/−0.9) | 8.4–11.4 | <0.0001 |
| LAD Lax (cm) | 13.0 (+/−0.7) | 11.8–14.7 | 11.8 (+/− 1.1) | 10.1–13.5 | <0.0001 |
| Ao (cm) | 7.5 (+/−0.6) | 6.6–8.6 | 7.3 (+/−0.5) | 7.4–8.4 | 0.1547 |
| IVSd (cm) | 3.3 (+/−0.4) | 2.7–4.0 | 3.5 (+/−0.4) | 2.8–4.2 | 0.0117 |
| LVIDd (cm) | 12.1 (+/−1.0) | 10.5–13.7 | 10.9 (+/−1.2) | 8.5–13.0 | <0.0001 |
| LVIDs (cm) | 6.9 (+/− 1.1) | 5.0–8.7 | 5.5 (+/−1.2) | 3.3–7.4 | <0.0001 |
| LVFWd (cm) | 2.8 (+/−0.3) | 2.2–3.4 | 2.8 (+/−0.5) | 2.2–3.7 | 0.7321 |
| FS (%) | 42.2 (+/−7.6) | 30.8–58.0 | 50.0 (+/−8.2) | 38.4–67.1 | <0.0001 |
