[Age-related changes in the weight of the body and of the extremity muscles in boys 7 to 17 years old].
Mass-inertial characteristics of upper and lower limbs determined in boys aged from 7 to 17 by anthropometric method. It was shown that body weight and weight of muscles of upper and lower limbs continuously increased. Dynamics of muscle groups studied changed unevenly in ontogenesis. Phases of slow (from 7 to 11 years) and fast (from 12 to 17) growth can be distinguished. Muscles of upper and lower limbs synchronously increase between 8 and 9 years of age, the parameters of the growth speed being twice as higher for arms than for legs. At 10 years growth processes reduce. In puberty musculature growth speed begins to increase between 11 and 12 years. Only speed of arm muscles growth increased at that time, while growth processes of lower extremities start to accelerate at 12-13 years. It was demonstrated that muscles growth in puberty occurs in two stages. Periods of arm muscles growth are 12 and 15 years and that is 13 and 15 years for leg muscles. Most significant growth speed for both groups falls on the age of 15. By 16 years growth speed reduces both for body and limb muscles weight. However, by 17 years growth speed increase for body weight and leg muscles only.
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D000293:Adolescent; D000375:Aging; D000886:Anthropometry; D001132:Arm; D001835:Body Weight; D002648:Child; D006801:Humans; D007866:Leg; D008297:Male; D024510:Muscle Development; D018482:Muscle, Skeletal / Q000254:growth & development*; D012016:Reference Values