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Characteristics and preliminary observations of the influence of electromyostimulation on the size and function of human skeletal muscle during 30 days of simulated microgravityThe effect of transcutaneous electromyostimulation (EMS) on the development of atrophy and the loss of strength in lower limb musculature in humans exposed to microgravity was determined in three subjects who received EMS twice daily in a 3-d on/1-d off cycle on their dominant leg during 30 days of bedrest. The output waveform from the stimulator was sequenced to the knee extensors, knee flexors, ankle extensors, and ankle flexors, and caused three isometric contractions of each muscle group per minute. It was found that, in the dominant leg, EMS acted to attenuate the changes caused by bedrest, such as reductions in the leg volume, muscle compartment size, cross-sectional area of slow- and fast-twitch fibers, strength, and aerobic enzyme activities, and an increase in leg compliance.
Document ID
19890058137
Document Type
Reprint (Version printed in journal)
Authors
Duvoisin, Marc R. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Convertino, Victor A. (NASA John F. Kennedy Space Center Cocoa Beach, FL, United States)
Buchanan, Paul (NASA Kennedy Space Center Cocoa Beach, FL, United States)
Gollnick, Philip A. (Washington State University Pullman, United States)
Dudley, Gary A. (NASA Kennedy Space Center; Bionetics Corp. Cocoa Beach, FL, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1989
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 60
ISSN: 0095-6562
Subject Category
AEROSPACE MEDICINE
Funding Number(s)
CONTRACT_GRANT: NAS10-10285
Distribution Limits
Public
Copyright
Other