Heart rate recovery after exercise and cardiac autonomic nervous activity in children

Citation
H. Ohuchi et al., Heart rate recovery after exercise and cardiac autonomic nervous activity in children, PEDIAT RES, 47(3), 2000, pp. 329-335
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Pediatrics,"Medical Research General Topics
Journal title
PEDIATRIC RESEARCH
ISSN journal
0031-3998 → ACNP
Volume
47
Issue
3
Year of publication
2000
Pages
329 - 335
Database
ISI
SICI code
0031-3998(200003)47:3<329:HRRAEA>2.0.ZU;2-F
Abstract
To investigate the difference in heart rate (HR) recovery after exercise be tween children and young adults, we administered a constant load of light e xercise intensity and progressive treadmill exercise tests to nine children (aged 9 to 12 y, group A) and eight young adults (six male and two female, aged 17 to 21 y, group B) who had a history of Kawasaki disease without si gnificant coronary arterial lesions. HR after both exercise protocols was a nalyzed. The low-frequency (LF) and high-frequency (HF) components of HR va riability were measured, and LF/HF was calculated (log LF, log HF, log L/H) . Arterial baroreflex sensitivity was assessed by the phenylephrine method. There were no differences between groups A and B in resting HR, peak HR, p eak oxygen uptake, and decreases in systolic blood pressure during the reco very period. HR 1 and 2 min after peak exercise and 1 min after constant-lo ad exercise was significantly lower in group A than in group B (p < 0.05), and the changes in HR from peak values after both exercise tests were also greater in group A than in group B (p < 0.05-0.01). Although no difference in arterial baroreflex sensitivity was observed, log HF was significantly h igher in group A than in group B (p < 0.01), and log L/H was significantly lower in group A than in group B (p < 0.05). The value of log HF correlated inversely with the decrease in HR immediately after both exercise protocol s (p < 0.05-0.01). Although log L/H correlated with the decrease in HR afte r peak exercise (p < 0.05-0.0005), the early decline in HR after constant-l oad exercise did not correlate with log L/H. Arterial baroreflex sensitivit y did not correlate with the decrease in HR at any recovery time. These dat a suggest that the early phase of HR recovery after light to severe exercis e is influenced by the cardiac parasympathetic nervous activity at rest and that the greater central cholinergic modulation of HR in children than in young adults may be responsible in part for children's faster HR recovery a fter exercise.