Katch F I, Hortobagyi T
Department of Exercise Science, University of Massachusetts, Amherst 01003.
Am J Clin Nutr. 1990 Oct;52(4):591-5. doi: 10.1093/ajcn/52.4.591.
The differences among fatfold thicknesses, girths, and muscle plus bone cross-sectional area (M+B CSA) were examined at three sites along the upper arm (distal, mid, and proximal) by using surface anthropometry (study 1, n = 40) and x ray (study 2, n = 53). Changes in anthropometry and x ray were also evaluated in nine obese patients who reduced body mass by less than or equal to 20.5 kg over 32 wk. Weight reduction resulted in nonproportional changes at the three sites, including significant differences in M+B CSA. Thus, it would not be valid to consider the arm as a geometric cylinder. Although a one-time assessment of upper arm M+B CSA with surface anthropometry may be valid at any of the three sites, changes in M+B CSA measured at any site may result in an under- or overestimation of actual changes in M+B CSA.
通过使用体表测量法（研究1，n = 40）和X线检查（研究2，n = 53），在沿上臂的三个部位（远端、中部和近端）检测了皮褶厚度、周长以及肌肉加骨骼横截面积（M+B CSA）之间的差异。还对9名肥胖患者进行了评估，这些患者在32周内体重减轻了20.5 kg及以下，观察其体表测量和X线检查的变化情况。体重减轻导致这三个部位出现非比例性变化，包括M+B CSA的显著差异。因此，将手臂视为几何圆柱体是无效的。尽管使用体表测量法一次性评估上臂M+B CSA在这三个部位中的任何一个部位可能是有效的，但在任何部位测量的M+B CSA变化可能会导致对M+B CSA实际变化的低估或高估。
