WISE-2005: Countermeasures to prevent muscle deconditioning during bed rest in women - PubMed (original) (raw)
Comparative Study
. 2014 Mar 15;116(6):654-67.
doi: 10.1152/japplphysiol.00590.2013. Epub 2014 Jan 23.
Affiliations
- PMID: 24458754
- DOI: 10.1152/japplphysiol.00590.2013
Free article
Comparative Study
WISE-2005: Countermeasures to prevent muscle deconditioning during bed rest in women
Stuart M C Lee et al. J Appl Physiol (1985). 2014.
Free article
Abstract
The objectives of this study were to evaluate the efficacy of two separate countermeasures, exercise and protein supplementation, to prevent muscle strength and lean tissue mass losses during 60 days of bed rest (BR) in women and whether countermeasure efficacy was influenced by pre-BR muscular fitness (strength, endurance, tissue mass). Twenty-four women were assigned to an exercise (EX, n = 8), a no-exercise control (CON, n = 8), or a no-exercise protein supplementation group (PROT, n = 8). EX performed supine treadmill exercise within lower body negative pressure 3-4 days/wk and maximal concentric and eccentric supine leg- and calf-press exercises 2-4 days/wk. PROT consumed a diet with elevated protein content compared with CON and EX (1.6 vs. 1.0 g·kg(-1)·day(-1)). Knee and calf isokinetic strength and endurance, isotonic leg-press strength, and leg lean mass were measured before and after BR. Post-BR knee extensor strength and endurance, ankle strength, and leg lean mass were significantly greater and leg-press strength tended to be higher in EX than in CON and PROT. Post-BR measures in PROT were not different than those in CON. Exercise countermeasure efficacy was less, and strength, endurance, and leg lean mass losses in CON and PROT were greater, in subjects who were more fit pre-BR. An exercise protocol combining resistive and aerobic exercise training protects against losses in strength, endurance, and leg lean mass in women during BR, while a nutritional countermeasure without exercise was not effective. Exercise countermeasures may require individualization to protect higher levels of strength and endurance.
Keywords: flywheel exercise; muscle endurance; muscle strength; nutrition; spaceflight; treadmill exercise within LBNP.
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