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Aging of the human neuromuscular system
1School of Physical Therapy, University of Western Ontario, Room 1400, Elborn College, 1201 Western Road, London, Ontario N6G 1H1, Canada. vandervo@uwo.ca
Muscle & Nerve
|December 26, 2001
Summary
Aging naturally reduces motor neurons and muscle mass, leading to sarcopenia. Exercise can help maintain motor function and prevent impairments in older adults.
Area of Science:
- Neurology
- Gerontology
- Exercise Physiology
Background:
- Normal aging involves motor neuron and muscle fiber loss, contributing to sarcopenia.
- Sedentary lifestyles exacerbate age-related neuromuscular decline in older adults.
- Neuromuscular system reserve capacity significantly decreases with age.
Purpose of the Study:
- To review the aging effects on the neuromuscular system.
- To discuss the decline in muscle strength across the adult lifespan.
- To explore age-related differences in muscle contraction types.
Main Methods:
- Comparison of voluntary and stimulated muscle strength across adult lifespan.
- Analysis of aging effects on isometric, concentric, and eccentric muscle contractions.
- Review of physiological adaptations in motor pathways in aged individuals.
Main Results:
- Muscle strength declines by approximately 1-2% annually after the sixth decade.
- Aging impacts concentric movements more than eccentric movements.
- Stiffer muscle structures and prolonged myosin crossbridge cycles contribute to aging effects.
Conclusions:
- Physiological adaptations in motor pathways are possible even in very old age with exercise.
- Long-term prevention strategies are crucial for older adults.
- Exercise can mitigate physical impairments and activity restrictions in the elderly.