Age affects eccentric muscle performance in vivo during a chronic exposure of stretch-shortening cycles.
Geronilla-KB; Baker-BA; Wu-JZ; Kashon-ML; Alway-SA; Cutlip-RG
ISB XXth Congress - ASB 29th Annual Meeting, July 31- August 5, 2005, Cleveland, Ohio. Cleveland, OH: International Society of Biomechanics, 2005 Jul; :142
The 55-64 year old demographic comprises the fastest growing sector of the labor force in the United States. However, the effects of age on muscle response and injury resulting from repetitive exposures to mechanical loading have not been studied extensively. It is clear that susceptibility to contraction-induced injury increases with age in both humans [I], and animals . The purpose of this research was to investigate if aging affects the ability of skeletal muscle to adapt to repetitive exposures of stretch-shortening cycles (SSCs). Skeletal muscle adaptation was assessed by characterizing changes in eccentric 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 muscle performance as a result of the repetitive exposures, while mal-adaptation was defined as a decrease in eccentric muscle performance as a result of the exposures.
Age-factors; In-vivo-studies; Muscles; Demographic-characteristics; Age-groups; Injuries; Exposure-assessment; Repetitive-work; Animals; Animal-studies
ISB XXth Congress - ASB 29th Annual Meeting, July 31- August 5, 2005, Cleveland, Ohio