Document Detail


Effects of exercise during head-down bed rest on postural control.
MedLine Citation:
PMID:  9143748     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: The effects of exercise on postural control during walking were evaluated following exposure to head-down bed rest (BR). METHODS: Two groups of male subjects (N = 18, mean age = 21.4 yr +/- SE 1.0) were exposed to 5 d of 6 degrees head-down bed rest. The experimental group (E) exercised 90 min.d-1 (n = 12 subjects) during the BR while the control group received no intervention (n = 6). The exercise treatment consisted of a combination of isotonic and isokinetic lower extremity exercise training. Electromyographic (EMG) activity in the tibialis anterior, gastrocnemius, vastus lateralis, and biceps femoris was measured during walking before and after BR. RESULTS: Following BR, EMG activity increased in both test subject groups for all muscles (p < 0.05). However, there were no significant differences in EMG activity between the C and E groups either before or after BR. CONCLUSIONS: These data suggest that the ability of the postural control system to adjust to the gravitational environment was compromised as a result of BR. In addition, we conclude that the exercise protocol used was not an effective countermeasure to the alterations in the postural control system.
Authors:
J E Davis; K E Horwood; G K DeJong
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  68     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  1997 May 
Date Detail:
Created Date:  1997-08-05     Completed Date:  1997-08-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  392-5     Citation Subset:  IM; S    
Affiliation:
Department of Exercise and Health Science, Alma College, MI 48801, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Analysis of Variance
Bed Rest* / adverse effects
Electromyography
Exercise / physiology*
Head-Down Tilt* / adverse effects
Humans
Hypogravity / adverse effects
Leg / physiopathology*
Male
Muscle Contraction / physiology*
Muscle, Skeletal / physiopathology*
Posture / physiology
Reflex, Abnormal / physiology*
Space Simulation / adverse effects

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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