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    • 宇田川 晃一 UDAGAWA Akikazu
    • 昭和大学医学部形成外科学教室|昭和大学医学部第二解剖学教室 Department of Plastic Surgery School of Medicine, Showa University|Anatomy, School of Medicine, Showa University


健康な成人104名 (男性: 49, 女性: 55) の右前腕近位1/3部及び遠位1/3部におけるX線CT写真について・皮下脂肪, 結合組織筋, 骨の断面積を測定し, 総断面積に対する比率を算出するとともに, 皮下脂肪厚を測定して, 性別, 年齢別, 体型 (Rohrer指数) 別の消長を検討した.結果: 1) 前腕の組織構成比は近遠両部位とも筋比が最も大で, 皮下脂肪比がこれに次ぎ, 結合組織比と骨比はほぼ相等しくて最も小であった.また, 両部位とも筋比は男性が, 皮下脂肪比は女性がそれぞれ他よりも優っていた.2) 筋の構成については, 両部とも屈筋群, 背側伸筋群, 横側伸筋群の順に大であったが, 遠位部では橈側伸筋群が著しく小となり, 他の構成分の比率が上昇した.3) 組織構成と年齢との関係については, 近遠両部位とも50歳代と60歳代で脂肪結合組織比は増加, 筋比は減少する傾向が認められ, この傾向は男性は60歳代で, 女性は50歳代でそれぞれ著明であり, 筋の退縮は大腿部よりも遅れることが明らかであった.4) 組織構成と体型との関係を見ると, 両部ともA, C, D体型の順に脂肪結合組織比は大となり, 筋比は小となり, 女性のD体型では前者が後者に近くなる傾向が認められた.5) 断面の皮下脂肪厚はすべての計測部位で女性が男性よりも優り, 近位部と遠位部では後者が前者よりも優る傾向が見られた.6) 皮下脂肪厚の年齢別, 体型別観察において, 橈側は一般に厚くて, Rohrer指数と最もよく平行し, 特に遠位1/3部橈側の皮下脂肪厚は肥満判定の指標として有効であると考えられた.

Using X-ray CT (computed tomography) images, the body composition of the right forearm in the proximal 1/3 and the distal 1/3 sections was studied in 104 humans (49 males, 55 females) . The total cross-sectional area, the each area of the subcutaneous fat, the connective tissue, the muscle and the bone were measured, then the percentage of the each area per the total area was calculated. Also the thickness of the subcutaneous fat was measured. And the changes due to sex, age and body type were investigated. The following results were obtained ; 1) Among the body compositions of the forearm in both sections, the muscle ratio was the largest, and the connective tissue ratio and the bone ratio which were almost equal to each other, and were the lowest. And the muscle ratio was higher in males than in females but the fat ratio was lower in males than in females. 2) Among the muscle composition in both sections, the flexor group was the largest, the dorsal extensor group was the second most and the radial extensor group was the smallest. But the radial extensor group was much decreased in the distal section. 3) The fat and connective tissue ratio increased and the muscle ratio decreased in fifties (remarkable in females) and sixties (remarkable in males) in both sections. 4) The fat and connective tissue ratio was the lowest in A type, the second most in C type and the higest in D type. The muscle ratio was the highest in A type, the second most in C type and the lowest in D type. 5) The subcutaneous fat was always thicker in females than in males, and thicker in the distal section than in the proximal section in most cases. 6) The subcutaneous fat at the radial site was generally thicker than the other sites and showed parallel relation with Rohrer Index. The thickness of the subcutaneous fat at the radial site in the distal 1/3 section was thought to be usefull as the index of the obesity.


  • Journal of The Showa Medical Association

    Journal of The Showa Medical Association 46(5), 687-695, 1986

    The Showa University Society


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