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Full-Text Articles in Exercise Science
Age Differences In Dynamic Fatigability And Variability Of Arm And Leg Muscles: Associations With Physical Function, Jonathon Senefeld, Tejin Yoon, Sandra K. Hunter
Age Differences In Dynamic Fatigability And Variability Of Arm And Leg Muscles: Associations With Physical Function, Jonathon Senefeld, Tejin Yoon, Sandra K. Hunter
Exercise Science Faculty Research and Publications
Introduction
It is not known whether the age-related increase in fatigability of fast dynamic contractions in lower limb muscles also occurs in upper limb muscles. We compared age-related fatigability and variability of maximal-effort repeated dynamic contractions in the knee extensor and elbow flexor muscles; and determined associations between fatigability, variability of velocity between contractions and functional performance.
Methods
35 young (16 males; 21.0 ± 2.6 years) and 32 old (18 males; 71.3 ± 6.2 years) adults performed a dynamic fatiguing task involving 90 maximal-effort, fast, concentric, isotonic contractions (1 contraction/3 s) with a load equivalent to 20% maximal voluntary isometric …