Energy Expenditure during Antiorthostatic Bed Rest (Simulated Microgravity)
Document Type
Article
Publication Date
6-1995
Publisher
American Physiological Society
Source Publication
Journal of Applied Physiology
Source ISSN
8750-7587
Abstract
Few studies have addressed the interaction between energy balance and lean body mass in healthy subjects during spaceflight or its simulations. We used doubly labeled water to measure total energy expenditure (TEE) in nine healthy adult men during two 7-day periods, once before and once during a 10-day head-down bed-rest period. Mean TEE was 21% less during than before bed rest; however, neither basal (BEE) nor resting (REE) energy expenditures changed, implying that the lesser TEE resulted from a reduction in physical activity. During the bed-rest period, energy intake was 563 +/- 280 kcal/day higher than TEE (P < 0.05) but body weight, fluid balance, BEE, and REE did not change relative to before bed rest. However, the small but statistically significant increase in body fat (0.44 +/- 0.67 kg, P < 0.05) during the bed-rest period suggests that body weight alone does not accurately reflect changes in energy balance during antiorthostatic bed rest.
Recommended Citation
Gretebeck, Randall J.; Schoeller, Dale A.; Gibson, Everett K.; and Lane, Helen W., "Energy Expenditure during Antiorthostatic Bed Rest (Simulated Microgravity)" (1995). College of Nursing Faculty Research and Publications. 916.
https://epublications.marquette.edu/nursing_fac/916
Comments
Journal of Applied Physiology, Vol. 34, No. 5 (June 1995): 2207-2211. DOI.
R.J. Gretebeck was affiliated with Johnson Space Center, at the time of publication.