Age-related fatigability in knee extensors and knee flexors during dynamic fatiguing contractions

Age-related fatigability in knee extensors and knee flexors during dynamic fatiguing contractions

This study investigated the effects of dynamic knee extension and flexion fatiguing task on torque and neuromuscular responses in young and older individuals. Eighteen young (8 males; 25.1 ± 3.2 years) and 17 older (8 males; 69.7 ± 3.7 years) volunteered. Following a maximal voluntary isometric cont...

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Bibliographic Details
Published in:Journal of electromyography and kinesiology 2022-02, Vol.62, p.102626-102626, Article 102626
Main Authors: Wu, Rui, De Vito, Giuseppe, Lowery, Madeleine M., O'Callaghan, Ben, Ditroilo, Massimiliano
Format: Article
Language:eng
Subjects:
Aged
Ageing
Dynamic contraction
Humans
Isometric Contraction
Knee
Knee extensors
Knee flexors
Knee Joint
Male
Muscle Fatigue
Muscle, Skeletal
Torque
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Summary:This study investigated the effects of dynamic knee extension and flexion fatiguing task on torque and neuromuscular responses in young and older individuals. Eighteen young (8 males; 25.1 ± 3.2 years) and 17 older (8 males; 69.7 ± 3.7 years) volunteered. Following a maximal voluntary isometric contraction test, participants performed a fatiguing task involving 22 maximal isokinetic (concentric) knee extension and flexion contractions at 60°/s, while surface EMG was recorded simultaneously from the knee extensors (KE) and flexors (KF). Fatigue-induced relative torque reductions were similar between age groups for KE (peak torque decrease: 25.15% vs 26.81%); however, KF torque was less affected in older individuals (young vs older peak torque decrease: 27.6% vs 11.5%; p 
ISSN:1050-6411
1873-5711