Abstract
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 O2 consumption rate of 50±9 and 34±13 ml min−1 kg−1 (mean±SD), respectively. Thirteen different activities were assayed. α-Glycerophosphate oxidation was lower in the 70+ group (38%, P~0.001), as was the respiratory capacity for fatty acids (19%, P~0.03). The remaining eleven activities, including those of the central bioenergetic reactions, were not lower in the 70+ group. Pyruvate and α-ketoglutarate dehydrogenase activities (i.e. the tricarboxylic acid cycle turnover) and the respiratory chain activity could all account for ~14 mmol O2 min−1 kg−1 muscle (37 °C). The capacity for aerobic ATP synthesis was ~35 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.
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Acknowledgements
We wish to express our gratitude to all of the enthusiastic volunteers, without whom this study would not have been possible. It was a most positive experience to collaborate with both the 20+ and 70+ age groups. The expert technical assistance of Ms. I-L. Føhns, H. Lauritzen, I. Kring and Mr. B. Larson is gratefully acknowledged. The study was supported by grant 504-14 from The Danish Research Foundation.
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Rasmussen, U.F., Krustrup, P., Kjaer, M. et al. Human skeletal muscle mitochondrial metabolism in youth and senescence: no signs of functional changes in ATP formation and mitochondrial oxidative capacity. Pflugers Arch - Eur J Physiol 446, 270–278 (2003). https://doi.org/10.1007/s00424-003-1022-2
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DOI: https://doi.org/10.1007/s00424-003-1022-2