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Association between heart rate variability and training response in sedentary middle-aged men

Authors:	Stephen H Boutcher and Phyllis Stein

Abstract:	The effect of exercise training on heart rate variability (HRV) and improvements in peak oxygen consumption ( $\dot V{\text{O}}_{\text{2}}$ _peak) was examined in sedentary middle-aged men. The HRV and absolute and relative $\dot V{\text{O}}_{\text{2}}$ _peak of training (n = 19) and control (n = 15) subjects were assessed before and after a 24-session moderate intensity exercise training programme. Results indicated that with exercise training there was a significantly increased absolute and relative $\dot V{\text{O}}_{\text{2}}$ _peak (P < 0.005) for the training group (12% and 11% respectively) with no increase for the control group. The training group also displayed a significant reduction in resting heart rate; however, HRV remained unchanged. The trained subjects were further categorized into high (n = 5) and low (n = 5) HRV groups and changes in $\dot V{\text{O}}_{\text{2}}$ _peak were compared. Improvements in both absolute and relative $\dot V{\text{O}}_{\text{2}}$ _peak were significantly greater (P > 0.005) in the high HRV group (17% and 20% respectively) compared to the low HRV group (6% and 1% respectively). The groups did not differ in mean age, pretraining oxygen consumption, or resting heart rate. These results would seem to suggest that a short aerobic training programme does not alter HRV in middle-aged men. Individual differences in HRV, however, may be associated with $\dot V{\text{O}}_{\text{2}}$ _peak response to aerobic training.

Keywords:	Heart rate variability Aerobic training Peak oxygen consumption
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