Quadriceps muscle electromyography activity during physical activities and resistance exercise modes in younger and older adults

Understanding the root cause of the age-related impairment in muscle adaptive remodelling with resistance exercise training (RET) and developing pragmatic and accessible resistance exercise for older adults, are essential research directives. We sought to determine whether indices of quadriceps musc...

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Bibliographic Details
Published in:Experimental gerontology 2020-07, Vol.136, p.110965-110965, Article 110965
Main Authors: Marshall, Ryan N., Morgan, Paul T., Martinez-Valdes, Eduardo, Breen, Leigh
Format: Article
Language:English
Subjects:
Activities of Daily Living
Aged
Ageing
Electromyography
Exercise
Humans
Muscle
Muscle Contraction
Muscle, Skeletal
Quadriceps Muscle
Resistance exercise training
Resistance Training
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Summary:Understanding the root cause of the age-related impairment in muscle adaptive remodelling with resistance exercise training (RET) and developing pragmatic and accessible resistance exercise for older adults, are essential research directives. We sought to determine whether indices of quadriceps muscle EMG activity in response to different modes of RET and activities of daily living (ADL), differed between 15 healthy younger (25 ± 3 years) and 15 older (70 ± 5 years) adults. On four separate days, participants completed a maximal voluntary contraction (MVC) of the knee extensors, followed by a 15 m walking task, stair climbing task (i.e. ADL) and lower-limb RET through body-weight squats (BW-RET) and seated knee extensions on a machine (MN-RET) or via elastic bands (EB-RET). Surface quadriceps electromyography (EMG) was measured throughout all tasks to provide indirect estimates of changes in muscle activity. MVC was significantly greater in young vs. older adults (Young: 256 ± 72 vs. Old: 137 ± 48 N·m, P 
ISSN:0531-5565
1873-6815
DOI:10.1016/j.exger.2020.110965