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This study investigated the relationship between the level of maximal oxygen uptake (VO2max) and the function of autonomic nervous system (ANS) in 30 young male adults. The function of ANS was measured by heart rate variability (HRV) and the post-exercise heart rate recovery (HRR). The results showed that there was a significant relationship between VO2max and HRV, but not between VO2max and HRR. Furthermore, the group of higher VO2max showed higher SDNN, RMSSD, TPlog, VLFlog, LFlog, HFlog level and lower physical stress index than those of the group of lower VO2max. In conclusion, there is a significant relationship between VO2max and the function of ANS measured by HRV in young male adults and it seems that the aerobic capacity measued by VO2max might affect HRV positively.