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Trunk muscle coactivation in preparation for sudden load.

Authors
Granata-KP; Orishimo-KF; Sanford-AH
Source
J Electromyogr Kinesiol 2001 Aug; 11(4):247-254
NIOSHTIC No.
20029679
Abstract
Biomechanical stability of the lumbar spine is an important factor in the etiology and control of low-back disorders. A principle component of biomechanical stability is the musculoskeletal stiffening generated by preparatory muscle coactivation. The goal of this investigation was to quantify preparatory behavior, evaluating trunk muscle activity immediately prior to sudden trunk flexion loading during static extension tasks compared to activity observed when subjects were informed no sudden load would occur. Coactive excitation was also examined as a function of fatigue and gender. Results demonstrated increased extensor muscle and flexor muscle coactivation following static fatiguing exertions, potentially compensating for reduced trunk stiffness. Female subjects produced greater flexor antagonism than in the males. No difference in the preparatory coactive muscle recruitment patterns were observed when subjects were expecting a sudden flexion load compared to recruitment patterns observed in similar static postures when subjects were informed no sudden load would be applied. This indicates the neuromuscular system relies greatly on response characteristics for the maintenance of stability in dynamic loading conditions.
Keywords
Back-injuries; Musculoskeletal-system; Musculoskeletal-system-disorders; Posture; Spine; Spinal-disorders; Spinal-stability; Muscular-disorders; Neuromuscular-system; Neuromuscular-system-disorders; Manual-lifting; Manual-materials-handling; Biomechanics
Contact
Kevin P Granata, PhD, Motion Analysis and Motor Performance Laboratory, Kluge Children's Rehabilitation Center, University of Virginia, 2270 Ivy Road, Charlottesville, VA 22903
CODEN
JEKIE3
Publication Date
20010801
Document Type
Journal Article
Email Address
kpg8n@virginia.edu
Funding Amount
160768
Funding Type
Grant
Fiscal Year
2001
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-000158
Issue of Publication
4
ISSN
1050-6411
Priority Area
Disease and Injury: Low Back Disorders
Source Name
Journal of Electromyography and Kinesiology
State
VA
Performing Organization
Motion Analysis and Motor Performance Laboratory, Kluge Children's Rehabilitation Center, University of Virginia, Charlottesville VA
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