High-intensity training increases spontaneous physical activity in children: a randomized controlled study.
OBJECTIVE
To test the hypothesis that resistance training may increase spontaneous physical activity in children.


METHODS
Two junior ice hockey teams were randomly assigned to unchanged training schedules (team ZSC, 21 boys; mean age, 13.2 years) or to participate twice weekly in guided resistance training for 4 months (team GCK, 25 boys; mean age, 13.4 years). Spontaneous physical activity energy expenditure (SpAEE; 3-axial accelerometry for 7 days), muscle strength, and body composition (dual energy x-ray absorptiometry) were measured at 0, 4, and 12 months.


RESULTS
Baseline measures did not differ in the groups, except for higher leg and trunk strength in team ZSC. In the intervention group compared with the control group, SpAEE significantly (P < or = .02) increased at 4 months (+25.5% versus 0%) and 12 months (+13.5% versus -9.5%). Leg and arm strength increased because of training intervention; all other variables were unchanged. None of these variables correlated with changes in SpAEE.


CONCLUSIONS
In boys who play ice hockey, spontaneous physical activity is inducible with resistance training; this effect seems to be independent of changes in body composition and strength. If this was confirmed in unselected children, resistance training might be a new strategy for childhood obesity prevention programs.
Center for Pediatric Endocrinology Zurich, Mohrlistrasse 69, CH-8006 Zurich, Switzerland. urs.eiholzer@pezz.ch
Urs
U
Eiholzer
Udo
U
Meinhardt
Renato
R
Petrò
Fabienne
F
Witassek
Felix
F
Gutzwiller
Theo
T
Gasser
D000293:Adolescent; D001823:Body Composition; D002648:Child; D004734:Energy Metabolism; D015444:Exercise; D015438:Health Behavior; D006688:Hockey; D006801:Humans; D008297:Male; D053580:Muscle Strength; D009765:Obesity / Q000517:prevention & control*; D011446:Prospective Studies; D055070:Resistance Training / Q000379:methods*; D018709:Statistics, Nonparametric; D013557:Switzerland