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AbstractIn brief: Sixty-four third-grade children participated in a ten-month (September to June), four-day-a-week fitness program (ten minutes of stretching and strength development exercises followed by 12 minutes of running). A control group of 45 children was allowed free play during this time. In June the experimental group completed a 1,600-meter run significantly faster than the control group. In the experimental group, boys had significantly greater improvements than girls. Exercise heart rates expressed as a percentage of predicted maximal heart rate showed no significant changes in control subjects, but in the experimental group, girls had increases from 73.7% to 80.5% and boys from 73.1% to 87.7% of maximal heart rate.
Siegel et al. (Tue,) studied this question.