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Handgrip and general muscular strength and endurance during prolonged bedrest with isometric and isotonic leg exercise trainingMeasurements of maximal grip strength and endurance at 40 percent max strength were obtained for 7 men 19-21 years of age, 1-2 days before and on the first recovery day during three 2-week bedrest (BR) periods, each separated by a 3-week ambulatory recovery period. The subjects performed isometric exercise (IME) for 1 hr/day, isotonic exercise (ITE) for 1 hr/day, and no exercise (NOE) in the three BR periods. It was found that the mean maximal grip strength was unchanged after all three BR periods. Mean grip endurance was found to be unchanged after IME and ITE training, but was significantly reduced after NOE. These results indicate that IME and ITE training during BR do not increase or decrease maximal grip strength, alghough they prevent loss of grip endurance, while the maximal strength of all other major muscle groups decreases in proportion to the length of BR to 70 days. The maximal strength reduction of the large muscle groups was found to be about twice that of the small muscle groups during BR. In addition, it is shown that changes in maximal strength after spaceflight, BR, or water immersion deconditioning cannot be predicted from changes in submaximal or maximal oxygen uptake values.
Document ID
19830062772
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA, United States)
Starr, J. C.
(NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field, CA, United States)
Van Beaumont, W.
(NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field, CA; St. Louis University, St. Louis, MO, United States)
Convertino, V. A.
(NASA Ames Research Center Laboratory of Human Environmental Physiology, Moffett Field, CA; Arizona, University, Tucson, AZ, United States)
Date Acquired
August 11, 2013
Publication Date
August 1, 1983
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Volume: 54
ISSN: 0095-0562
Subject Category
Aerospace Medicine
Accession Number
83A43990
Distribution Limits
Public
Copyright
Other

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