The energy Expenditure for Quiet Play and Cycling of Boys Seven to Fourteen Years of Age

Abstract
Seventy determinations of energy expenditure for quiet play and 61 for cycling by 22 subjects, 7 to 14 years of age, are reported. A respiration chamber equipped with a bicycle ergometer of electric brake type was used. The results are stated as the total expenditure, i.e., inclusive of the basal metabolism. Nineteen determinations were made on boys 7 and 8 years of age. Sitting quietly at play the average energy expenditure of these boys was 3.1 Cal. per kg per hr., or 0.59 Cal. per cm of ht. per hr. For cycling, the average was 6.6 Cal. per kg per hr., or 1.23 Cal. per cm of ht. per hr. Twenty-nine determinations of the energy expenditure in quiet play and 20 determinations for cycling were made on boys 9 to 11 years of age. For quiet play the average expenditure was 2.6 Cal. per kg per hr., or 0.58 Cal. per cm of ht. per hr.; for cycling, 5.1 Cal. per kg per hr., or 1.15 Cal. per cm of ht. per hr. Twenty-two determinations were made on boys 12 to 14 years of age. For quiet play the average was 2.1 Cal. per kg per hr., or 0.58 Cal. per cm of ht. per hr.; for cycling, 4.5 Cal. per kg per hr., or 1.24 Cal. per cm of ht. per hr.

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