力士の骨密度に関する検討 Effects of Special Physical Characteristics and Exercise on Bone Mineral Density in Sumo Wrestlers

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Abstract

日本の国技である相撲の世界は,特殊な食生活形態および身体的特徴を有し,さらに稽古量も多いことから,これらが骨に与える影響は大きいと考えられる.そこで本研究では相撲界における,体格,日常の食生活および身体活動状況等が骨密度に及ぼす影響について経時的観察(1年間)を実施し,さらに,同年代の一般男子学生の骨密度との比較検討も併せて行った.その結果,力士の骨密度は,一般男子学生に比べ,いずれの部位においても有意な高値(p<0.001)を示した.また,力士の番付けと体格の間に関係が認められたことからも,力士にとって体格を増進し,骨格筋等の筋力アップとそれに伴う骨の強化は,最も重要な課題であると考えられる.また,入門1~2年の力士で,1年間で上腕骨および大腿骨の骨幹部の骨密度の増加が認められたことから,骨幹部は体重や稽古(荷重やメカニカルストレス)の影響を受けやすい部位である可能性が考えられる.さらに,入門歴6~8年の力士において大腿骨近位部骨密度の増加が認められたことからも,しこを踏むという相撲独特の運動(稽古)が各部位の骨密度を高めるものと思われる.

Sumo is the national sport of Japan, and Sumo wrestlers have a specific diet, special physical characterisitics and do a great deal of practice for their sport. These factors may markedly affect the bones. We observed for 1 year the effects of the physical characteristics, daily diet, and physical activities of sumo wrestlers on bone mineral density (BMD) and compared their BMD with that of age-matched male students as controls. BMD values for the lumber spine, humerus, and femur of sumo wrestlers were higher than those of the controls (p<0.001) and were markedly correlated with the physical characteristics of the sumo wrestlers. Accordingly, the most important factors for sumo wrestlers to increase BMD may be improvement of their physique and enhancement of skeletal muscle strength. Sumo wrestlers 1-2 years after entering a stable showed increased BMD of the diaphysis of the humerus and femur, suggesting that the diaphysis is affected by weight and practice (load and mechanical stress). In sumo wrestlers with 6-8 years of experience, BMD of the femur proximal metaphysis was increased. This finding suggests that stamping in the ring, an exercise specific to sumo, increases BMD in each bone part. (Received August 12, 1998; Accepted form March 19, 1999)

Journal

  • Journal of home economics of Japan

    Journal of home economics of Japan 50(7), 673-682, 1999-07-15

    日本家政学会

References:  18

Cited by:  1

Codes

  • NII Article ID (NAID)
    110003168796
  • NII NACSIS-CAT ID (NCID)
    AN10040097
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    09135227
  • NDL Article ID
    4802248
  • NDL Source Classification
    ZE16(社会・労働--家事・家政--学術誌)
  • NDL Call No.
    Z6-113
  • Data Source
    CJP  CJPref  NDL  NII-ELS  NDL-Digital 
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