Abstract
Purpose
This study examined heart rate recovery (HRR) and heart rate variability (HRV) following submaximal and maximal exercise in boys (n = 13; 10.1 ± 0.8 years) and girls (n = 12; 10.1 ± 0.7 years).
Methods
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, 1-min 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 recovery.
Results
There 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 = 4.61 ± 0.28 vs. girls = 4.28 ± 0.52 ms) or during recovery (lnSDNN: boys 3.78 ± 0.46 vs. girls 3.87 ± 0.64 ms and lnTP: boys 7.33 ± 1.09 vs. girls; 7.44 ± 1.24 ms2). Post hoc pairwise comparisons showed a significant difference between boys and girls for lnTP at rest (boys = 9.14 ± 0.42 vs. girls = 8.30 ± 1.05 ms2).
Conclusion
Parasympathetic modulation was similar between boys and girls at rest and during recovery from exercise, which could explain similarities observed in HRR.
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Abbreviations
- HF:
-
High-frequency power
- HFnu:
-
High-frequency power normalized units
- HR:
-
Heart rate
- HRR:
-
Heart rate recovery
- HRV:
-
Heart rate variability
- ln:
-
Natural log
- pNN50:
-
Percentage of consecutive NN intervals differing by more than 50 ms
- PNS:
-
Parasympathetic nervous system
- RER:
-
Respiratory exchange ratio
- RMSSD:
-
Root mean square of successive RR intervals
- RPE:
-
Ratings of perceived exertion
- SDNN:
-
Standard deviation of NN intervals
- TP:
-
Total power
- VE :
-
Pulmonary ventilation
- VO2 :
-
Oxygen consumption
- VO2max :
-
Maximal oxygen consumption
- VT:
-
Ventilatory threshold
- W:
-
Watts
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Acknowledgments
The investigators would like to acknowledge Brittany Wilkerson, M.S. for her help in placing electrodes on the female participants and James Jones, Ph.D. for his advice on the statistical methods used in the study.
Conflict of interest
The authors report no conflicts of interest. No funding was received for this study.
Ethical standards
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
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Communicated by Massimo Pagani.
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Guilkey, J.P., Overstreet, M. & Mahon, A.D. Heart rate recovery and parasympathetic modulation in boys and girls following maximal and submaximal exercise. Eur J Appl Physiol 115, 2125–2133 (2015). https://doi.org/10.1007/s00421-015-3192-y
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DOI: https://doi.org/10.1007/s00421-015-3192-y