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High-intensity training increases spontaneous physical activity in children: a randomized controlled study.

Urs Eiholzer¹, Udo Meinhardt, Renato Petrò

¹Center for Pediatric Endocrinology Zurich, Mohrlistrasse 69, CH-8006 Zurich, Switzerland. urs.eiholzer@pezz.ch

The Journal of Pediatrics

|October 23, 2009

Summary

Resistance training significantly increased spontaneous physical activity energy expenditure (SpAEE) in young ice hockey players. This finding suggests resistance training may be a novel strategy for childhood obesity prevention.

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Area of Science:

Pediatric Exercise Science
Sports Medicine
Childhood Obesity Research

Background:

Childhood obesity is a growing public health concern.
Understanding factors that influence children's physical activity levels is crucial for prevention strategies.
Resistance training's impact on spontaneous physical activity in youth is not well-established.

Purpose of the Study:

To investigate whether resistance training can increase spontaneous physical activity in children.
To examine the effects of a 4-month resistance training program on spontaneous physical activity energy expenditure (SpAEE) in adolescent boys.

Main Methods:

Two junior ice hockey teams were randomized: one to a resistance training group (n=25) and one to a control group (n=21).
The intervention group participated in guided resistance training twice weekly for 4 months.
Spontaneous physical activity energy expenditure (SpAEE), muscle strength, and body composition were measured at baseline, 4 months, and 12 months.

Main Results:

The resistance training group showed a significant increase in SpAEE at 4 months (+25.5%) and 12 months (+13.5%) compared to the control group.
Leg and arm strength increased in the intervention group, but body composition and other variables remained unchanged.
Changes in SpAEE did not correlate with changes in strength or body composition.

Conclusions:

Resistance training can effectively increase spontaneous physical activity in adolescent boys.
The positive effects on physical activity appear independent of changes in body composition and strength.
Resistance training may represent a viable new strategy for childhood obesity prevention programs if confirmed in broader populations.