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Effects of lumbar extensor fatigue and fatigue rate on postural sway.

Authors
Davidson-BS; Madigan-ML; Nussbaum-MA
Source
Eur J Appl Physiol 2004 Oct; 93(1-2):183-189
NIOSHTIC No.
20040950
Abstract
Falls from heights resulting from a loss of balance are a major concern in the occupational setting. Previous studies have documented a deleterious effect of lower extremity fatigue on balance. The purpose of this study was to investigate the effect of lumbar extensor fatigue on balance during quiet standing. Additionally, the effects of fatigue rate on balance and balance recovery rate were assessed. Eight center-of-pressure-based measures of postural sway were collected from 13 participants, both before and after a protocol that fatigued the lumbar extensors to 60% of their unfatigued maximum voluntary exertion force. In addition, postural sway was measured for 30 min after the fatiguing protocol, at 5-min intervals, to quantify balance recovery rate during recovery from fatigue. Two different fatigue rates were achieved by fatiguing participants over either 10 min or 90 min. Results show an increase up to 58% in time-domain postural sway measures with lumbar extensor fatigue, but no change in frequency-domain measures. Fatigue rate did not affect the magnitude of these postural sway increases, nor did it affect the rate of balance recovery following fatigue. Statistical power for the latter result, however, was low. These results show that lumbar extensor fatigue increases postural sway and may contribute to fall-from-height accidents.
Keywords
Humans; Men; Women; Physiology; Back-injuries; Muscles; Musculoskeletal-system; Musculoskeletal-system-disorders; Fatigue; Posture; Physiological-effects; Physiological-fatigue; Physiology; Physiological-function; Statistical-analysis; Author Keywords: Balance; Falls; Fatigue; Postural sway; Spine
Contact
M. L. Madigan, Department of Engineering Science and Mechanics, Virginia Polytechnic Institute and State University, Mail Code 0219, Blacksburg, VA 24061
CODEN
EJAPFN
Publication Date
20041001
Document Type
Journal Article
Email Address
mlmadigan@vt.edu
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007882
Issue of Publication
1-2
ISSN
1439-6319
Source Name
European Journal of Applied Physiology
State
VA
Performing Organization
Virginia Polytechnic Institute and State University
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