Age-related changes in motor unit firing pattern of vastus lateralis muscle during low-moderate contraction

Age-related changes in motor unit activation properties remain unclear for locomotor muscles such as quadriceps muscles, although these muscles are preferentially atrophied with aging and play important roles in daily living movements. The present study investigated and compared detailed motor unit...

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Bibliographic Details
Published in:AGE 2016-06, Vol.38 (3), p.48-48, Article 48
Main Authors: Watanabe, Kohei, Holobar, Aleš, Kouzaki, Motoki, Ogawa, Madoka, Akima, Hiroshi, Moritani, Toshio
Format: Article
Language:English
Subjects:
Adult
Age
Aged
Aged, 80 and over
Aging
Aging - physiology
Anatomy & physiology
Biomedical and Life Sciences
Cell Biology
Comparative analysis
Electrodes
Electromyography
Environmental studies
Experiments
Geriatrics/Gerontology
Human body
Humans
Isometric Contraction - physiology
Laboratories
Life Sciences
Male
Men
Middle Aged
Molecular Medicine
Muscle Fatigue - physiology
Muscle strength
Muscle Strength - physiology
Muscular system
Older people
Physical fitness
Quadriceps Muscle - physiology
Recruitment
Recruitment, Neurophysiological - physiology
Statistical analysis
Young adults
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Summary:Age-related changes in motor unit activation properties remain unclear for locomotor muscles such as quadriceps muscles, although these muscles are preferentially atrophied with aging and play important roles in daily living movements. The present study investigated and compared detailed motor unit firing characteristics for the vastus lateralis muscle during isometric contraction at low to moderate force levels in the elderly and young. Fourteen healthy elderly men and 15 healthy young men performed isometric ramp-up contraction to 70 % of the maximal voluntary contractions (MVC) during knee extension. Multichannel surface electromyograms were recorded from the vastus lateralis muscle using a two-dimensional grid of 64 electrodes and decomposed with the convolution kernel compensation technique to extract individual motor units. Motor unit firing rates in the young were significantly higher (~+29.7 %) than in the elderly ( p  
ISSN:0161-9152
2509-2715
1574-4647
2509-2723
DOI:10.1007/s11357-016-9915-0