Authors: J P Guilkey M Overstreet A D Mahon
Publish Date: 2015/05/28
Volume: 115, Issue: 10, Pages: 2125-2133
Abstract
Participants completed 10 min of supine rest followed by a graded exercise test to maximal effort On a separate day participants performed submaximal exercise at ventilatory threshold Immediately following both exercise bouts 1min HRR was assessed in the supine position HRV variables were analyzed under controlled breathing in the time and frequency domains over the final 5 min of rest and recoveryThere were no significant differences in HRR following maximal and submaximal exercise between boys 58 ± 8 and 59 ± 8 beats min−1 respectively and girls 54 ± 6 and 52 ± 19 beats min−1 respectively There also were no significant interactions between groups from rest to recovery from maximal exercise for any HRV variables However there was a difference in the response between sexes from rest to recovery from submaximal exercise for log transformed standard deviation of NN intervals lnSDNN and log transformed total power lnTP No differences were observed for lnSDNN at rest boys = 461 ± 028 vs girls = 428 ± 052 ms or during recovery lnSDNN boys 378 ± 046 vs girls 387 ± 064 ms and lnTP boys 733 ± 109 vs girls 744 ± 124 ms2 Post hoc pairwise comparisons showed a significant difference between boys and girls for lnTP at rest boys = 914 ± 042 vs girls = 830 ± 105 ms2
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