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Isokinetic Strength and Endurance During 30-day 6 deg Head-Down Bed Rest with Isotonic and Isokinetic Exercise TrainingThe purpose of our study was to determine if an intensive, intermittent, isokinetic, lower extremity exercise training program would attenuate or eliminate the decrease of muscular strength and endurance during prolonged bed rest (BR). The 19 male subjects (36 +/- 1 yr, 178 +/- 2 cm, 76.5 +/- 1.7 kg) were allocated into a no exercise (NOE) training group (N = 5), an isotonic (lower extremity cycle orgometer) exercise (ITE) training group (N = 7), and an isokinetic (isokinetic knee flexion-extension) exercise (IKE) training group (N = 7). Peak knee (flexion and extension) and shoulder (abduction-adduction) functions were measured weekly in all groups with one 5-repetition set. After BR, average knee extension total work decreased by 16% with NOE, increased by 27% with IKE, and was unchanged with ITE. Average knee flexion total work and peak torque (strength) responses were unchanged in all groups. Force production increased by 20% with IKE and was unchanged with NOE and ITE. Shoulder total work was unchanged in all groups, while gross average peak torque increased by 27% with ITE and by 22% with IKE, and was unchanged with NOE. Thus, while ITE training can maintain some isokinetic functions during BR, maximal intermittent IKE training can increase other functions above pre-BR control levels.
Document ID
19970022763
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Greenleaf, J. E.
(NASA Ames Research Center Moffett Field, CA United States)
Bernauer, E. M.
(NASA Ames Research Center Moffett Field, CA United States)
Ertl, A. C.
(California Univ. Davis, CA United States)
Bond, M.
(Loredan Biomedical, Inc. Davis, CA United States)
Bulbulian, R.
(California Univ. Davis, CA United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1994
Publication Information
Publication: Aviation, Space, and Environmental Medicine
Publisher: Aerospace Medical Association
Volume: 65
Subject Category
Aerospace Medicine
Report/Patent Number
NAS 1.15:112332
NASA-TM-112332
Accession Number
97N72143
Funding Number(s)
PROJECT: RTOP 199-22-44
CONTRACT_GRANT: NAG2-410
PROJECT: RTOP 199-21-12
PROJECT: DA Proj. 3A1-61101-A-91C
PROJECT: RTOP 199-22-32
PROJECT: RTOP 199-22-22
PROJECT: RTOP 199-22-12
Distribution Limits
Public
Copyright
Public Use Permitted.
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