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 journalArticlepeer-review

5 Scopus citations


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
Issue number6
StatePublished - 2014
Externally publishedYes


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

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

Fingerprint Dive into the research topics of 'The metabolic cost of an integrated exercise program performed during 14 days of bed rest'. Together they form a unique fingerprint.

Cite this