Reaction Moment at the L5/S1 Joint During Simulated Forward Slipping With a Handheld Load

The purpose of the study was to investigate the effects of load on the net moment response at the L5/S1 joint during simulated slip events. Six young individuals were instructed to take one step with a handheld load. Sudden floor movement was randomly introduced to simulate unexpected slips. Differe...

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Bibliographic Details
Published in:International journal of occupational safety and ergonomics 2014-01, Vol.20 (3), p.429-436
Main Authors: Liu, Jian, Lockhart, Thurmon, Kim, Sukwon
Format: Article
Language:English
Subjects:
Adult
back injury
Biological and medical sciences
Biomechanical Phenomena
Ergonomics. Workplace layout
Ergonomics. Workplace layout. Occupational psychology
Female
Hand
Humans
load carrying
Lumbar Vertebrae - physiology
Lumbosacral Region - physiology
Male
Medical sciences
Occupational Health
Occupational medicine
Public health. Hygiene-occupational medicine
reactive recovery
Sacrum - physiology
slips and falls
Walking - physiology
Weight-Bearing - physiology
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Summary:The purpose of the study was to investigate the effects of load on the net moment response at the L5/S1 joint during simulated slip events. Six young individuals were instructed to take one step with a handheld load. Sudden floor movement was randomly introduced to simulate unexpected slips. Different loads conditions (0%, 10%, 20%, 30% of body weight) were introduced at random. Three-dimensional net moments at the L5/S1 joint were computed via downward inverse dynamic model. Peak joint moment generated at 30% load level was found to be significantly higher compared to no-load condition. No peak moment differences were found among no-load, 10% or 20% load levels. Additionally, the findings from this study indicated a flexiondominant net L5/S1 joint moment pattern during motion phase associated with slip-induced falls.
ISSN:1080-3548
2376-9130
DOI:10.1080/10803548.2014.11077067