期刊
PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY
卷 446, 期 2, 页码 270-278出版社
SPRINGER-VERLAG
DOI: 10.1007/s00424-003-1022-2
关键词
age effects; ageing; human skeletal muscle; isolated mitochondria; oxidative phosphorylation; oxygen uptake; quadriceps muscle; respiration
类别
The mitochondrial theory of ageing was tested. Isolated mitochondria from the quadriceps muscle from normal, healthy, young (age 20+ years, n = 12) and elderly (70+ years, n = 11) humans were studied in respiratory experiments and the data expressed as activities of the muscle. In each group, the subjects exhibited a variation of physical activity but, on average, the groups were representative for their age with maximum O-2 consumption rate of 50 +/- 9 and 34 +/- 13 ml min(-1) kg(-1) (mean+/-SD), respectively. Thirteen different activities were assayed. alpha-Glycerophosphate oxidation was lower in the 70+ group (38%, P similar to 0.001), as was the respiratory capacity for fatty acids (19%, P similar to 0.03). The remaining eleven activities, including those of the central bioenergetic reactions, were not lower in the 70+ group. Pyruvate and a-ketoglutarate dehydrogenase activities (i.e. the tricarboxylic acid cycle turnover) and the respiratory chain activity could all account for similar to14 mmol O-2 min(-1) kg(-1) muscle (37degreesC). The capacity for aerobic ATP synthesis was similar to35 mmol ATP min(-1) kg(-1). The mitochondrial capacities were far in excess of whole-body performance. They were related to physical activity, but not to age. The mitochondrial theory of ageing, which attributes the age-related decline of muscle performance to decreased mitochondrial function, is incompatible with these results.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据