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Characterization of changes in eccentric work in vivo during a chronic exposure of stretch-shortening cycles: age effects.

Cutlip-RG; Geronilla-KB; Wu-JZ; Baker-BA; Kashon-ML; Alway-SA
ISB XXth Congress - ASB 29th Annual Meeting, July 31- August 5, 2005, Cleveland, Ohio. Cleveland, OH: International Society of Biomechanics, 2005 Jul; :143
Musculo-skeletal injury in aged workers has been identified as an important research focus by The National Occupational Research Agenda [1]. However, the effect of age on skeletal muscle adaptation from repetitive mechanical loading has not been studied extensively. It is clear that susceptibility to contraction-induced injury increases with age [2]. The purpose of this research was to investigate if aging affects the ability of skeletal muscle to adapt to repetitive exposures of stretchshortening cycles (SSCs). Skeletal muscle adaptation was assessed by characterizing changes in dynamic performance longitudinally during the chronic exposure period. We tested the specific hypothesis that young animals can adapt to repetitive mechanical loading of potentially injurious SSCs while older animals will not be able to adapt. Adaptation was defined by a maintenance or increase in eccentric (negative) work as a result of the repetitive exposures, while maladaptation was defined as a decrease in negative work as a result of the exposures.
In-vivo-study; In-vivo-studies; Age-factors; Injuries; Musculoskeletal-system-disorders; Repetitive-work; Workers; Worker-health; Chronic-exposure; Exposure-assessment
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ISB XXth Congress - ASB 29th Annual Meeting, July 31- August 5, 2005, Cleveland, Ohio
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division