Document Detail

LBNP treadmill exercise maintains spine function and muscle strength in identical twins during 28-day simulated microgravity.
MedLine Citation:
PMID:  17395762     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to determine whether lower body negative pressure (LBNP) treadmill exercise maintains lumbar spinal compressive properties, curvature, and back muscle strength after 28 days of 6 degrees head-down tilt (HDT) bed rest (BR). We hypothesize that LBNP treadmill exercise will maintain lumbar spine compressibility, lumbar lordosis and back muscle strength after 28 days of 6 degrees HDT bed rest. Fifteen healthy identical twin pairs (14 women and 16 men) participated in this study. One identical twin was randomly assigned to the nonexercise control (Con) group, and their sibling was assigned to the exercise (Ex) group. The lumbar spine was significantly more compressible Post-BR compared with Pre-BR in the Con (P=0.01). Lumbar spine compressibility Post-BR was not significantly different compared with Pre-BR in the Ex group (P=0.89). In both the Con and Ex groups, there were no significant changes Post-BR in lumbar lordosis compared with Pre-BR. Back muscle strength significantly decreased in the Con group Post-BR (P=0.002), whereas in the Ex group back muscle strength was not significantly different from Pre-BR values. A significant increase in lumbar spine compressibility in the Con group suggests that spinal deconditioning to gravity occurs during 28-day bed rest. Changes in the mechanical properties of the lumbar spine may be an early indicator of lumbar intervertebral disk degeneration. Supine LBNP treadmill exercise provides axial loads to the lumbar spine and may prevent lumbar spine deconditioning associated with HDT bed rest.
Brandon R Macias; Peihong Cao; Donald E Watenpaugh; Alan R Hargens
Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.; Twin Study     Date:  2007-03-29
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  102     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  2007 Jun 
Date Detail:
Created Date:  2007-06-06     Completed Date:  2007-11-05     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2274-8     Citation Subset:  IM    
University of California, San Diego, Department of Orthopaedic Surgery, 350 Dickinson St., Suite 121, San Diego, CA 92103-8894, USA.
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MeSH Terms
Compressive Strength
Lower Body Negative Pressure / methods*
Lumbar Vertebrae / physiology*
Muscle Contraction / physiology*
Muscle, Skeletal / physiology*
Physical Exertion / physiology
Twins, Monozygotic / physiology*
Weight-Bearing / physiology*
Grant Support

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

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