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| Variable | Pre-HD | Peak Stress | t | p value |
|---|---|---|---|---|
| Heart rate (bpm) | 77.45±11.92 | 80.38±14.65 | -3.413 | 0.001 |
| P wave (ms) | 112.3±11.68 | 113.59±11.11 | -1.259 | 0.210 |
| PR (ms) | 173.55±30.26 | 169.11±31.30 | 4.449 | <0.001 |
| QRS wave (ms) | 99.20±15.11 | 100.55±15.25 | -2.745 | 0.007 |
| QTmax (ms) | 407.91±31.53 | 411.12±35.19 | -1.777 | 0.078 |
| QTcmax (ms) | 460.05±24.53 | 470.93±24.92 | -6.290 | <0.001 |
