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      Skeletal muscle mass and distribution in 468 men and women aged 18–88 yr

      1 , 2 , 2 , 1
      Journal of Applied Physiology
      American Physiological Society

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          Abstract

          We employed a whole body magnetic resonance imaging protocol to examine the influence of age, gender, body weight, and height on skeletal muscle (SM) mass and distribution in a large and heterogeneous sample of 468 men and women. Men had significantly ( P < 0.001) more SM in comparison to women in both absolute terms (33.0 vs. 21.0 kg) and relative to body mass (38.4 vs. 30.6%). The gender differences were greater in the upper (40%) than lower (33%) body ( P < 0.01). We observed a reduction in relative SM mass starting in the third decade; however, a noticeable decrease in absolute SM mass was not observed until the end of the fifth decade. This decrease was primarily attributed to a decrease in lower body SM. Weight and height explained ∼50% of the variance in SM mass in men and women. Although a linear relationship existed between SM and height, the relationship between SM and body weight was curvilinear because the contribution of SM to weight gain decreased with increasing body weight. These findings indicate that men have more SM than women and that these gender differences are greater in the upper body. Independent of gender, aging is associated with a decrease in SM mass that is explained, in large measure, by a decrease in lower body SM occurring after the fifth decade.

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          Author and article information

          Journal
          Journal of Applied Physiology
          Journal of Applied Physiology
          American Physiological Society
          8750-7587
          1522-1601
          July 01 2000
          July 01 2000
          : 89
          : 1
          : 81-88
          Affiliations
          [1 ]School of Physical and Health Education, Queen's University, Kingston, Ontario, Canada K7L 3N6; and
          [2 ]Obesity Research Center, St. Luke's/Roosevelt Hospital, Columbia University, College of Physicians and Surgeons, New York, New York 10025
          Article
          10.1152/jappl.2000.89.1.81
          10904038
          261819e9-8d66-41e0-ae67-61b71978500a
          © 2000
          History

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