Comparison of biomechanical and anatomical effects following eccentric and concentric exertions

Amrish O. Chourasia, Mary E. Sesto, Youngkyoo Jung, Robert S. Howery, Robert G. Radwin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

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).

Original languageEnglish (US)
Title of host publicationProceedings of the Human Factors and Ergonomics Society 49th Annual Meeting, HFES 2005
Pages1287-1291
Number of pages5
StatePublished - Dec 1 2005
Externally publishedYes
Event49th Annual Meeting of the Human Factors and Ergonomics Society, HFES 2005 - Orlando, FL, United States
Duration: Sep 26 2005Sep 30 2005

Publication series

NameProceedings of the Human Factors and Ergonomics Society
ISSN (Print)1071-1813

Conference

Conference49th Annual Meeting of the Human Factors and Ergonomics Society, HFES 2005
CountryUnited States
CityOrlando, FL
Period9/26/059/30/05

ASJC Scopus subject areas

  • Human Factors and Ergonomics

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  • Cite this

    Chourasia, A. O., Sesto, M. E., Jung, Y., Howery, R. S., & Radwin, R. G. (2005). Comparison of biomechanical and anatomical effects following eccentric and concentric exertions. In Proceedings of the Human Factors and Ergonomics Society 49th Annual Meeting, HFES 2005 (pp. 1287-1291). (Proceedings of the Human Factors and Ergonomics Society).