Borkan G A, Hults D E, Gerzof S G, Robbins A H
Am J Phys Anthropol. 1985 Mar;66(3):289-95. doi: 10.1002/ajpa.1330660306.
Computed tomography (CT) scans were taken of 21 middle-aged men (mean age 46.3 years) and 20 older men (mean age 69.4 years) to measure differences in body composition with age. Overall, the older men weighed 8.2 kg less than the middle-aged men, and this difference was primarily the result of their having less lean tissue. Although fat mass (by whole body potassium counting) was only slightly less in older men, there were distributional differences in fat between the age groups. Total abdomen adipose tissue area (from CT) was similar in both groups, although the subcutaneous portion of the abdomen adipose tissue was less in the older men, and they had correspondingly more adipose tissue within the abdominal cavity. Muscle areas of the leg and arm were significantly less in the older men, as were all lean tissues of the abdomen and chest. When these data were corrected for differences in body weight with age, the results were still significant, suggesting a centripetalization and internalization of fat with age. Causes of this apparent fat redistribution and decrease of lean tissue with age were not revealed by this study and are presently unknown.
对21名中年男性（平均年龄46.3岁）和20名老年男性（平均年龄69.4岁）进行了计算机断层扫描（CT），以测量身体成分随年龄的差异。总体而言，老年男性比中年男性轻8.2千克，这种差异主要是由于他们的瘦组织较少。尽管通过全身钾计数得出老年男性的脂肪量仅略少，但两个年龄组之间的脂肪分布存在差异。两组的腹部总脂肪组织面积（通过CT测量）相似，尽管老年男性腹部脂肪组织的皮下部分较少，且他们腹腔内的脂肪组织相应较多。老年男性腿部和手臂的肌肉面积明显较小，腹部和胸部的所有瘦组织也是如此。当对这些数据进行年龄相关的体重差异校正后，结果仍然显著，表明随着年龄增长，脂肪向心性分布和向内转移。本研究未揭示这种明显的脂肪重新分布和随年龄增长瘦组织减少的原因，目前尚不清楚。
