Effects of carried weight on random motion and traditional measures of postural sway

The purpose of the study was to investigate the effects of load weight carried by soldiers upon postural sway. Fourteen US Army enlisted men participated. Postural sway and muscle activity were measured while participants stood on a force plate. The load weight conditions, comprised of Army clothing...

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Bibliographic Details
Published in:Applied ergonomics 2006-09, Vol.37 (5), p.607-614
Main Authors: Schiffman, Jeffrey M., Bensel, Carolyn K., Hasselquist, Leif, Gregorczyk, Karen N., Piscitelle, Louis
Format: Article
Language:English
Subjects:
Adolescent
Adult
Applied physiology
Armed forces
Biological and medical sciences
Ergonomics
Ergonomics. Work place. Occupational physiology
Fundamental and applied biological sciences. Psychology
Human physiology applied to population studies and life conditions. Human ecophysiology
Humans
Male
Medical sciences
Military load carriage
Military Personnel
Motion
Postural Balance - physiology
Posture
Posture - physiology
Reliability
Stabilogram-diffusion analysis
United States
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
Weight-Bearing - physiology
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Summary:The purpose of the study was to investigate the effects of load weight carried by soldiers upon postural sway. Fourteen US Army enlisted men participated. Postural sway and muscle activity were measured while participants stood on a force plate. The load weight conditions, comprised of Army clothing and load-carriage equipment were 6, 16, and 40 kg. With an increase in load weight, stabilogram-diffusion analysis revealed that random movement of postural sway decreased. Also, with an increase in load weight, center of pressure excursions increased linearly but muscle activity changed minimally. In short, increasing load weight challenged the load carriers’ stability, reduced the randomness of postural sway and required the load carriers to exert greater control of the load in order to maintain balance.
ISSN:0003-6870
1872-9126
DOI:10.1016/j.apergo.2005.10.002