Relationship Between Exercise Capacity And Heart Rate Variability In Trained And Untrained Individuals
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PURPOSETo examine the relationship between exercise capacity and measures of heart rate variability (HRV) in trained and untrained males and to determine whether different types of training affect (HRV) in a different manner.METHODSThirtynine male athletes and nonathletes (21.23 yr.) performed a graded maximal exercise test using the Bruce treadmill protocol. Ambulatory Holter monitor was used to record (HRV). The relationship between time to exhaustion and measures of (HRV) were determined using correlation analysis. Additionally, (HRV) for endurance trained, anaerobictrained, or nontrained subjects were compared using oneway analysis of variance.RESULTSSignificant correlations were observed between time to exhaustion and the mean of the RR intervals (r = 0.51, p = 0.001) and standard deviations of RR intervals during 24h (r = 0.38, p = 0.017). Additionally, exercise capacity tended to correlate with the square root of the mean for the sum of squares of differences between adjacent RR intervals (52.924, r = 0.31, p =0.053) and in the proportion adjacent RR intervals having differences of 750 milliseconds (22.714, r =0.29, p = 0.07). No significant differences were observed between types of training or measures of HRV.CONCLUSIONExercise training positively affects selected measures of (HRV) and may help decrease risk of arrhythmia or sudden death.
