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Muscle blood flow and mitochondrial function: influence of aging
Ronald L Terjung1, Ryszard Zarzeczny, H T Yang
1Department of Biomedical Sciences in the College of Veterinary Medicine, University of Missouri, Columbia, MO 65211, USA.
International Journal of Sport Nutrition and Exercise Metabolism
|November 15, 2002
Summary
Aging reduces skeletal muscle aerobic capacity, but exercise training can improve it by increasing mitochondria and capillarity. Inactivity is a key factor limiting aged muscle function.
Area of Science:
- Exercise Physiology
- Skeletal Muscle Biology
- Aging Research
Background:
- Skeletal muscle's aerobic capacity (VO2max) depends on mitochondrial capacity, blood flow, and oxygen exchange.
- Aging and inactivity lead to reduced aerobic capacity, while exercise training can improve it.
- The interplay between these factors in aged muscle is not fully understood.
Purpose of the Study:
- To investigate the coordinated alterations in skeletal muscle mitochondrial capacity, blood flow, and oxygen exchange in aging and exercise.
- To determine the impact of exercise training on these parameters in the elderly.
- To identify the primary limitations to aerobic function in aged muscle.
Main Methods:
- The study reviews existing literature on skeletal muscle aerobic capacity, blood flow, and oxygen exchange in relation to aging and exercise.
- It analyzes the effects of inactivity and exercise training on mitochondrial concentration, capillarity, and blood flow capacity.
- It discusses the central cardiovascular limitations versus peripheral muscle adaptations.
Main Results:
- Aerobic capacity reduction in the elderly is linked to inactivity, with exercise training improving mitochondrial concentration and capillarity.
- Exercise-induced angiogenesis increases oxygen exchange capacity, and higher mitochondrial content is crucial for enhanced VO2max.
- While central cardiovascular function limits whole-body performance, peripheral vascular remodeling can improve flow capacity in aged muscle.
Conclusions:
- Skeletal muscle aerobic function in the elderly is primarily limited by inactivity, not solely by intrinsic cellular changes.
- Exercise training effectively induces beneficial biochemical adaptations and angiogenesis in aged muscle.
- Addressing inactivity is key to improving aerobic function in older adults.