We concluded that cardiorespiratory fitness can be improved effectively by using HRV for daily training prescription.ĪCSM (1998) American College of Sports Medicine Position Stand. No significant differences were observed in the changes of VO 2peak between the groups. The change in Load max was significantly greater in HRV group compared to TRA group (0.5 ± 0.4 vs. Peak oxygen consumption ( VO 2peak) and maximal running velocity (Load max) were measured in maximal treadmill test before and after the training. If there was significant decrease in HRV (below reference value or decreasing trend for 2 days), low-intensity training or rest was prescribed. Increase or no change in HRV resulted in high-intensity training on that day. Individual training program for HRV group was based on individual changes in high-frequency R–R interval oscillations measured every morning. TRA group trained on 6 days a week, with two sessions at low and four at high intensity. Four-week training period consisted of running sessions lasting 40 min each at either low- or high-intensity level. Twenty-six healthy, moderately fit males were randomized into predefined training group (TRA, n = 8), HRV-guided training group (HRV, n = 9), and control group ( n = 9). Purpose of this study was to test utility of heart rate variability (HRV) in daily endurance exercise prescriptions.
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