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American Journal of Clinical Nutrition, Vol 59, 28-31, Copyright © 1994 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Resting metabolic rate before exercise vs a control day

TR Thomas, BR Londeree, DA Lawson and FW Kolkhorst
Department of Health and Physical Education, University of Missouri, Columbia 65211.

Investigations on resting and recovery metabolism have used both preexercise and separate control-day measurements as a baseline for comparisons. The purpose of this study was to compare preexercise resting data with nonexercise control-day resting data. Seven active men aged 25 +/- 5 y and weighing 83.2 +/- 15.4 kg followed prescribed dietary (12-h fast) and activity (48-h abstinence) preparatory protocols and were scheduled to exercise for 60 min on three separate occasions. A fourth session involved no exercise (control) and included an extended rest period. Resting metabolic rate (RMR) and heart rate measured in a semirecumbent position were not significantly different among preexercise and control conditions. Respiratory exchange ratio (RER) increased as the control rest was extended to 120 min. Reliabilities for both RMR and RER were initially high but were decreased at the end of the extended rest. These results suggest that preexercise RMR data can be used as a baseline for comparison purposes. In addition, prolonging the rest period does not appear to improve the RMR or RER values.




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Copyright © 1994 by The American Society for Nutrition