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FIGURE 12-1 Anatomic skeletal muscle components at the first four body composition levels. The fifth level, whole body, is not shown.

TABLE 12-1 Proportional Contribution of Skeletal Muscle to the Body Weight of a Man at Different Stages of Development

Developmental Stage

Skeletal Muscle (% of Body Weight)

Birth

21

Weaning

18

Adolescent

36

Adult

45

Elderly

27

 

SOURCE: Adapted from Heymsfield et al., 1995.

TABLE 12-2 Distribution of Total Body Protein in the 70 kg Reference Man

Organ or Tissue

Protein Mass (kg)

% of Total Body Protein

Skeletal muscle

4.8

45.3

Brain

0.11

0.10

Liver

0.32

3.0

Kidney

0.053

0.50

Heart

0.008

0.50

Blood

0.99

9.3

Skin

0.75

7.1

Skeleton

1.9

7.9

Total body

10.5

100

 

SOURCE: Adapted from Snyder et al., 1975.



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