title: A longitudinal study of energy expenditure in males during steady-state exercise.
abstract: Our purpose was to investigate longitudinal changes in gross energy expenditure (GEE) of 20 middle-aged and older men during submaximal exercise in 1969 and in 1985. GEE (kcal/min) was estimated using the caloric equivalent for each liter of oxygen consumed at the measured respiratory exchange ratio during submaximal exercise. The men performed a 10-min submaximal cycle ergometer exercise test at a power output (PO) of 100 W. Pedalling frequency was 50 rpm. Results showed a significant 5.9% decrease in GEE (p less than .01) from 8.5 +/- 0.8 (M +/- SD) kcal/min in 1969 to 8.0 +/- 0.4 (M +/- SD) Kcal/min in 1985. In addition, the effects of chronological age and leisure time physical activity on GEE were assessed and found to be nonsignificant, although a significant decrease in GEE over time (p less than .02) was observed in both groups. The present results support a decrease in GEE in middle-aged and older men over the 16-year time period. Furthermore, this decrease in GEE persisted regardless of chronological age or leisure time physical activity status.
authors.affiliation: Exercise Physiology Laboratory, Purdue University.
authors.forename: A W
authors.initials: AW
authors.lastname: Gardner
authors.forename: E T
authors.initials: ET
authors.lastname: Poehlman
authors.forename: D A
authors.initials: DA
authors.lastname: Sedlock
authors.forename: D L
authors.initials: DL
authors.lastname: Corrigan
authors.forename: S
authors.initials: S
authors.lastname: Siconolfi
mesh_terms: D000328:Adult; D000375:Aging / Q000502:physiology*; D004734:Energy Metabolism; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D010101:Oxygen Consumption; D005082:Physical Exertion