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The Energy Expenditure of Boys and Girls 9 to 11 Years of Age (1) Sitting Listening to the Radio (Phonograph), (2) Sitting Singing, and (3) Standing Singing

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Nutrition Laboratory, Teachers College, Columbia University, New York City, in cooperation with the Bureau of Human Nutrition and Home Economics, U. S. Department of Agriculture, Washington, D. C.

The energy expenditure of 22 children (12 boys and 10 girls), 9 to 11 years of age, was measured while they were sitting in a respiration chamber listening to the phonograph. The average energy expenditure of the boys was 2.07 ± 0.06 Cal. per kilogram of body weight per hour (coefficient of variation, 13.0%) and 0.54 ± 0.01 Cal. per centimeter of height per hour (coefficient of variation, 11.9%); and of the girls 1.80 ± 0.04 Cal. per kilogram of body weight per hour (coefficient of variation, 10.5%) and 0.45 ± 0.01 Cal. per centimeter of height per hour (coefficient of variation, 12.8%).

The energy expenditure of 15 children (6 boys and 9 girls) was measured while they were sitting singing. The average energy expenditure of the boys was 2.23 ± 0.06 Cal. per kilogram of body weight per hour (coefficient of variation, 13.2%) and 0.57 ± 0.02 Cal. per centimeter of height per hour (coefficient of variation, 14.0%); and of the girls 2.06 ± 0.07 Cal. per kilogram of body weight per hour (coefficient of variation, 17.5%) and 0.52 ± 0.02 Cal. per centimeter of height per hour (coefficient of variation, 15.9%).

The energy expenditure of 17 children (8 boys and 9 girls) was measured while they were standing singing. The average energy expenditure of the boys was 2.35 ± 0.05 Cal. per kilogram of body weight per hour (coefficient of variation, 10.7%) and 0.60 ± 0.01 Cal. per centimeter of height per hour (coefficient of variation, 11.6%); and of the girls 2.13 ± 0.06 Cal. per kilogram of body weight per hour (coefficient of variation, 14.2%) and 0.54 ± 0.01 Cal. per centimeter of height per hour (coefficient of variation, 11.2%).