Background
Sixty minutes of daily moderate‐to‐vigorous physical activity (PA) are recommended for children. This study investigated the additional impact of high‐volume sports club participation on the autonomic nervous system in active children, while controlling for acute effects of short‐term PA.

Materials and methods
Forty‐nine children (29 females) aged 10–13 years were investigated. Sports club participation was assessed with a validated questionnaire. Short‐term PA and night‐time autonomic tone (spectral power and nonlinear analysis of heart rate variability) were measured with an ambulatory device (Actiheart®). Children were dichotomized into two groups, based on their individual weekly time spent in a sports club: low‐volume group < 180 min/week (N = 26) and high‐volume group ≥ 180 min/week (N = 23).

Results
Children in the high‐volume group exhibited higher indices of vagal tone compared with the children in the low‐volume group. Short‐term moderate PA had a significant impact on the night course of autonomic activity. Boys showed a linear increase in vagal activity over the night course in relation to volumes of short‐term moderate PA of the previous day. A similar but nonsignificant trend was observed for girls.

Conclusions
In active children, higher volumes of sports club participation have an additional benefit on indices of autonomic tone.

Direct Link: https://doi.org/10.1111/eci.12112

Journal: European journal of clinical investigation. 2013 Aug;43(8):821-8

Keywords: autonomic nervous system, children, heart rate variability, MVPA, Physical Activity, school,

Applications: HRV,

CamNtech Reference: AH13017

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