title: Heart rate response and parasympathetic modulation during recovery from exercise in boys and men.
abstract: The purpose of this study was to examine the influence of postexercise parasympathetic modulation, measured by heart rate variability (HRV), on heart rate recovery (HRR) in boys (n = 13, 10.1 ± 0.8 years) and men (n = 13, 23.9 ± 1.5 years) following maximal and submaximal exercise. Subjects completed 10 min of supine rest, followed by graded exercise on a cycle ergometer to maximal effort. On a separate day, subjects exercised at an intensity equivalent to ventilatory threshold. Immediately following both exercise bouts, 1-min HRR was assessed in the supine position. HRV was analyzed under controlled breathing during the final 5 min of rest and recovery in the time and frequency domains and transformed to natural log (ln) values. Boys had a greater 1-min HRR than men following maximal (58 ± 8 vs. 47 ± 11 beats·min(-1)) and submaximal (59 ± 8 vs. 47 ± 15 beats·min(-1)) exercise (p < 0.05). Following maximal exercise, boys had greater ln root mean square successive differences in R-R intervals (2.52 ± 0.95 ms), ln standard deviation of NN intervals (3.34 ± 0.57 ms), ln high-frequency power (4.32 ± 2.00 ms(2)), and ln low-frequency power (4.98 ± 1.17 ms(2)) than men (1.33 ± 0.37 ms, 2.52 ± 0.24 ms, 1.32 ± 1.06 ms(2) and 2.80 ± 0.74 ms(2), respectively) (p < 0.05). There were no differences in any HRV variables between groups following submaximal exercise (p > 0.05). In conclusion, it appears that greater parasympathetic modulation accounts for greater HRR following maximal exercise in boys versus men. Although submaximal HRR was greater in boys, parasympathetic responses were similar between groups.
authors.affiliation: a Human Performance Laboratory, Ball State University, Muncie, IN 47303, USA.
authors.forename: Justin P
authors.initials: JP
authors.lastname: Guilkey
authors.forename: Matthew
authors.initials: M
authors.lastname: Overstreet
authors.forename: Bo
authors.initials: B
authors.lastname: Fernhall
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Mahon
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D010275:Parasympathetic Nervous System / Q000502:physiology*; D012146:Rest; D055815:Young Adult
keywords: cardiovascular regulation; exercice maximal; exercice sous-maximal; heart rate recovery; heart rate variability; maturation; maximal exercise; pediatrics; pédiatrie; récupération du rythme cardiaque; régulation cardiovasculaire; submaximal exercise; variabilité du rythme cardiaque