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Table 2 Multiple regression analyses for predictors of heart rate variability

From: Vigorous physical activity predicts higher heart rate variability among younger adults

  lnRMSSDa (ms) lnLFP (ms squared) lnHFP (ms squared)
Model 1 Model 2b Model 1 Model 2b Model 1 Model 2b
  R 2 (0.10)c R 2 (0.18) R 2 (0.07) R 2 (0.15) R 2 (0.08) R 2 (0.14)
Vigorous activity (minutes) 0.34 (.002)d 0.24 (0.04) 0.27 (0.02) .19 (0.10) 0.30 (0.01) 0.20 (0.08)
Moderate activity (minutes) 0.04 (0.74) 0.11 (0.31) −0.22 (0.05) −.19 (0.10) 0.06 (0.61) 0.13 (0.25)
  1. aRoot mean square of successive differences
  2. bAge, gender, diastolic blood pressure as covariates
  3. cAdjusted R 2
  4. dStandardized beta (p value)