Table 3. Determinants of achieving more than 90% of the age predicted maximal heart rate during exercise stress test: univariate logistic regression analysis.
| Variable | Odd ratio (95% CI) | P value |
|---|---|---|
| Age, 1SD = 12.40 year | 0.573 (0.431–0.762) | <0.001 |
| Baseline heart rate, 1SD = 14.38 bpm | 1.512 (1.150–1.987) | 0.003 |
| Baseline SBP, 1SD = 18.99 mmHg | 0.756 (0.580–0.984) | 0.037 |
| Baseline PP, 1SD = 14.60 mmHg | 0.673 (0.513–0.883) | 0.004 |
| Heart rate variability indices | ||
| lnVLF, 1SD = 0.87 ms2 | 1.722 (1.192–2.486) | 0.004 |
| lnLF, 1SD = 1.00 ms2 | 1.499 (1.125–1.996) | 0.006 |
| lnHF, 1SD = 1.22 ms2 | 1.295 (0.996–1.683) | 0.053 |
| lnTP, 1SD = 0.82 ms2 | 1.554 (1.144–2.110) | 0.005 |
| LF/HF, 1SD = 1.23 | 1.068 (0.828–1.379) | 0.611 |
CI = confidence interval; HF = high frequency component of heart rate variability power spectrum; LF = very low frequency component of heart rate variability power spectrum; PP = pulse pressure; SBP = systolic blood pressure; SD = standard deviation; TP = total power of heart rate variability power spectrum; VLF = very low frequency component of heart rate variability power spectrum.