The metabolic cost of an integrated exercise program performed during 14 days of bed rest

Jessica M. Scott, Kyle Hackney, Meghan Downs, Jamie Guined, Robert Ploutz-Snyder, James Fiedler, David Cunningham, Lori Ploutz-Snyder

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Background: Exercise countermeasures designed to mitigate muscle atrophy during long-duration spacefl ight may not be as effective if crewmembers are in negative energy balance (energy output > energy input). This study determined the energy cost of supine exercise (resistance, interval, aerobic) during the spacefl ight analogue of bed rest. Methods: Nine subjects (eight men and one woman; 34.5 ±8.2 yr) completed 14 d of bed rest and concomitant exercise countermeasures. Body mass and basal metabolic rate (BMR) were assessed before and during bed rest. Exercise energy expenditure was measured during and immediately after [excess post-exercise oxygen consumption (EPOC)] each of fi ve different exercise protocols (30-s, 2-min, and 4-min intervals, continuous aerobic, and a variety of resistance exercises) during bed rest. Results: On days when resistance and continuous aerobic exercise were performed daily, energy expenditure was signifi cantly greater (2879 ±280 kcal) than 2-min (2390 ±237 kcal), 30-s (2501 ±264 kcal), or 4-min (2546 ±264 kcal) exercise. There were no signifi cant differences in BMR (prebed rest: 1649 ±216 kcal; week 1: 1632 ±174 kcal; week 2: 1657 ±176 kcal) or body mass (pre-bed rest: 75.2 ±10.1 kg; post-bed rest: 75.2 ±9.6 kg). Discussion: These fi ndings highlight the importance of energy balance for long-duration crewmembers completing a high-intensity exercise program with multiple exercise sessions daily.

Original languageEnglish (US)
Pages (from-to)612-617
Number of pages6
JournalAviation Space and Environmental Medicine
Volume85
Issue number6
DOIs
StatePublished - 2014

Fingerprint

Bed Rest
Exercise
Costs and Cost Analysis
Basal Metabolism
Energy Metabolism
Muscular Atrophy
Oxygen Consumption

Keywords

  • Disuse
  • Energy expenditure
  • Post-exercise oxygen consumption
  • Spaceflight

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

Cite this

The metabolic cost of an integrated exercise program performed during 14 days of bed rest. / Scott, Jessica M.; Hackney, Kyle; Downs, Meghan; Guined, Jamie; Ploutz-Snyder, Robert; Fiedler, James; Cunningham, David; Ploutz-Snyder, Lori.

In: Aviation Space and Environmental Medicine, Vol. 85, No. 6, 2014, p. 612-617.

Research output: Contribution to journalArticle

Scott, JM, Hackney, K, Downs, M, Guined, J, Ploutz-Snyder, R, Fiedler, J, Cunningham, D & Ploutz-Snyder, L 2014, 'The metabolic cost of an integrated exercise program performed during 14 days of bed rest', Aviation Space and Environmental Medicine, vol. 85, no. 6, pp. 612-617. https://doi.org/10.3357/ASEM.3772.2014
Scott, Jessica M. ; Hackney, Kyle ; Downs, Meghan ; Guined, Jamie ; Ploutz-Snyder, Robert ; Fiedler, James ; Cunningham, David ; Ploutz-Snyder, Lori. / The metabolic cost of an integrated exercise program performed during 14 days of bed rest. In: Aviation Space and Environmental Medicine. 2014 ; Vol. 85, No. 6. pp. 612-617.
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abstract = "Background: Exercise countermeasures designed to mitigate muscle atrophy during long-duration spacefl ight may not be as effective if crewmembers are in negative energy balance (energy output > energy input). This study determined the energy cost of supine exercise (resistance, interval, aerobic) during the spacefl ight analogue of bed rest. Methods: Nine subjects (eight men and one woman; 34.5 ±8.2 yr) completed 14 d of bed rest and concomitant exercise countermeasures. Body mass and basal metabolic rate (BMR) were assessed before and during bed rest. Exercise energy expenditure was measured during and immediately after [excess post-exercise oxygen consumption (EPOC)] each of fi ve different exercise protocols (30-s, 2-min, and 4-min intervals, continuous aerobic, and a variety of resistance exercises) during bed rest. Results: On days when resistance and continuous aerobic exercise were performed daily, energy expenditure was signifi cantly greater (2879 ±280 kcal) than 2-min (2390 ±237 kcal), 30-s (2501 ±264 kcal), or 4-min (2546 ±264 kcal) exercise. There were no signifi cant differences in BMR (prebed rest: 1649 ±216 kcal; week 1: 1632 ±174 kcal; week 2: 1657 ±176 kcal) or body mass (pre-bed rest: 75.2 ±10.1 kg; post-bed rest: 75.2 ±9.6 kg). Discussion: These fi ndings highlight the importance of energy balance for long-duration crewmembers completing a high-intensity exercise program with multiple exercise sessions daily.",
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