期刊
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
卷 64, 期 9, 页码 968-974出版社
GERONTOLOGICAL SOC AMER
DOI: 10.1093/gerona/glp044
关键词
(31)P spectroscopy; Oxidative capacity; Exercise; Aging
资金
- Tobacco-Related Disease Research Program [15RT-0100]
- National Institute of Health [P01 HL091830]
- Association Francaise contre les Myopathies
- Francis Family Foundation
- American Heart Association [0835209N]
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [P01HL091830] Funding Source: NIH RePORTER
Background. Aging is associated with a decline in exercise capacity that may be attributable to maladaptations in both skeletal muscle perfusion and metabolisms yet very little is known regarding the real-time. within-muscle interplay between these parameters during physical activity. Therefore, we utilized an unique nuclear magnetic resonance sequence to concomitantly examine changes in lower leg skeletal muscle perfusion and metabolism. Methods. In young (26 5 years. n = 6) and older (70 +/- years, n = 6) healthy volunteers, arterial spin labeling measurements of muscle perfusion were combined with 31 Phosphorous ((31)P) nuclear magnetic resonance spectroscopy to monitor high-energy phosphate metabolites during and after 5 minutes of moderate-intensity (approximate to 5W) plantar flexion exercise. Results. Compared with young, end-exercise perfusion was diminished in older participants (43 +/- 10 mL/100 g/minute. olds; 60 +/- 7 mL/100 g.minute, young), accompanied by greater phosphocreatine (PCr) depletion (-28% +/- 12%, old; -19% +/- 7%,young) and elevated inorganic phosphate/PCr (0.41 +/- 0.2, old; 0.24 +/- 0.09, young); yet the time Constant for PCr recovery (tau, an index of muscle oxidative capacity) was similar between groups (51 +/- 17 seconds. old: 48 +/- 7 seconds. young). Conclusions. Together, these preliminary data provide evidence of an age-related decline in tissue perfusion and increased metabolic stress during exercise but demonstrate that overall oxidative capacity in the elderly does not appear negatively affected by this relatively hypoperfused state.
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