The decline in skeletal muscle mass with aging is mainly attributed to a reduction in type II muscle fiber size.

@article{Nilwik2013TheDI,
  title={The decline in skeletal muscle mass with aging is mainly attributed to a reduction in type II muscle fiber size.},
  author={Rach{\'e}l Nilwik and Tim Snijders and Marika Leenders and Bart B. L. Groen and Janneau M X van Kranenburg and Lex B Verdijk and Luc Jc van Loon},
  journal={Experimental gerontology},
  year={2013},
  volume={48 5},
  pages={492-8}
}
BACKGROUND The loss of skeletal muscle mass with aging has been attributed to a decline in muscle fiber number and muscle fiber size. OBJECTIVE To define to what extent differences in leg muscle cross-sectional area (CSA) between young and elderly men are attributed to differences in muscle fiber size. METHODS Quadriceps muscle CSA and type I and type II muscle fiber size were measured in healthy young (n=25; 23 ± 1 y) and older (n=26; 71 ± 1 y) men. Subsequently, the older subjects… CONTINUE READING
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