Kanehisa H, Ikegawa S, Tsunoda N, Fukunaga T
Faculty of Education, Toyama University, Japan.
Int J Sports Med. 1994 Oct;15(7):420-5. doi: 10.1055/s-2007-1021081.
Age changes in the cross-sectional areas (CSAs) of fat and muscle tissues of limbs were investigated by using a B-mode ultrasonic technique for 245 males and 275 females aged 6 to 60 years. Four measurement sites were selected in the right limbs: the forearm, upper arm, lower leg and thigh. In an age span from 13 to 15 years, fat CSA for males decreased, while that for females increased at every site. Fat CSAs for both sexes increased in their thirties, but from then there was no more increase with aging. During early childhood, females had similar growth curves in muscle CSAs to those of males. An apparent sex separation in muscle CSAs took place at 13 years of age and after, the relative gender differences in muscle CSAs became larger with growth in the upper extremity than in the lower one. For both sexes, muscle CSA in every site remained almost constant during middle age. This age change in fat and muscle CSAs of limbs during the period of growth generally resembles that reported previously for total fat and fat free mass, respectively. However, age trend in fat CSAs during middle age, a lack of increase on reaching and after the forties differs from that described by prior studies for fat mass.
采用B超技术，对245名6至60岁男性和275名6至60岁女性四肢脂肪和肌肉组织的横截面积（CSA）随年龄的变化进行了研究。在右肢选取了四个测量部位：前臂、上臂、小腿和大腿。在13至15岁年龄段，男性各部位的脂肪CSA下降，而女性各部位的脂肪CSA增加。两性的脂肪CSA在三十多岁时均有所增加，但此后不再随年龄增长。幼儿期，女性肌肉CSA的生长曲线与男性相似。13岁及以后，肌肉CSA出现明显的性别差异，上肢肌肉CSA的相对性别差异随生长比下肢更大。对两性而言，各部位的肌肉CSA在中年期几乎保持不变。生长期间四肢脂肪和肌肉CSA的这种年龄变化总体上分别类似于先前报道的总脂肪和去脂体重的变化。然而，中年期脂肪CSA的年龄趋势，即在四十岁及以后不再增加，与先前研究中描述的脂肪量不同。
