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Skeletal muscle mitochondrial function and lean body mass in healthy exercising elderly
Debra L Waters1, William M Brooks, Clifford R Qualls
1Department of Internal Medicine, University of New Mexico School of Medicine, 2701 Frontier Pl NE Surge Bldg. Rm 215, Albuquerque, NM 87131, USA. dwaters@salud.umn.edu
Mechanisms of Ageing and Development
|March 29, 2003
Summary
Aging reduces mitochondrial function, impacting muscle mass. Physical activity may help preserve mitochondrial function in older adults, though more research is needed.
Area of Science:
- Gerontology
- Exercise Physiology
- Mitochondrial Biology
Background:
- Sarcopenia, or age-related muscle mass decline, may be linked to reduced mitochondrial function.
- The impact of physical activity on age-related mitochondrial decline is not fully understood.
Purpose of the Study:
- To investigate age-related changes in mitochondrial function.
- To determine if physical activity levels influence mitochondrial function in older adults.
Main Methods:
- Dynamic 31PMRS was used to assess mitochondrial function in 45 older and 20 younger adults.
- Measurements included Phosphocreatine (PCr), inorganic phosphate (Pi), phosphodiester (PDE), [ADP], pH, and recovery times (t(1/2)) post-exercise.
- Participants were matched for body mass and grouped by age (older vs. younger) and activity level (high vs. low).
Main Results:
- Older adults exhibited lower PCr and Pi, and higher PDE compared to younger adults.
- Recovery times for PCr and [ADP] were longer in older adults, particularly in the low activity group.
- Higher PDE levels correlated with longer PCr recovery times in older, low-activity females.
Conclusions:
- Mitochondrial function declines with age in healthy, exercising older adults.
- Physical activity level appears to influence the extent of age-related mitochondrial decline.