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Comparison of biomechanical and anatomical effects following eccentric and concentric exertions.

Authors
Chourasia-AO; Sesto-ME; Jung-Y; Howery-RS; Radwin-RG
Source
Proceedings of the Human Factors and Ergonomics Society 49th Annual Meeting, Sep 26-30, 2005, Orlando, Florida, Santa Monica, CA: Human Factors and Ergonomics Society, 2005 Sep; 49(14):1287-1291
NIOSHTIC No.
20043838
Abstract
Work place exertions may include muscle shortening (concentric) or muscle lengthening (eccentric) contractions. This study investigates the upper limb mechanical properties and magnetic resonance images (MRI) of the involved muscles following submaximal eccentric and concentric exertions. Twelve participants were randomly assigned to perform at 30 per second eccentric or concentric forearm supination exertions at 50% isometric maximum voluntary contraction (MVC) for 30 minutes. Measurement of mechanical stiffness, isometric MVC, localized discomfort and MRI supinator: extensor signal intensity ratio was done before, immediately after, 1 hour after and 24 hours after the bout of exercise. A 53% average decrease in mechanical stiffness after 1 hour was observed for the eccentric group (p< 0.05) compared to a 1% average decrease for the concentric group (p> 0.05). Edema, indicative of swelling, was observed 24 hrs after exercise, with an average increase in the MRI supinator: extensor signal intensity ratio of 36% for the eccentric group and less than 10% for the concentric group (p<0.05).
Keywords
Humans; Men; Women; Etiology; Muscle-function; Muscle-stress; Muscles; Musculoskeletal-system; Musculoskeletal-system-disorders; Diseases; Power-tools; Hand-tools; Physiology; Physiological-function; Posture
CODEN
PHFSDQ
Publication Date
20050901
Document Type
Conference/Symposia Proceedings
Funding Type
Grant
Fiscal Year
2005
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007793
Issue of Publication
14
ISSN
1071-1813
Source Name
Proceedings of the Human Factors and Ergonomics Society 49th Annual Meeting
State
WI
Performing Organization
University of Wisconsin, Madison
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