Seasonal Variation of Bone Metabolism and Bone Mineral Density in Male Alpine Skiers

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  • 男子アルペンスキー選手における身体組成及び骨代謝・骨密度のシーズン変化についての縦断的研究
  • ダンシ アルペンスキー センシュ ニ オケル シンタイ ソセイ オヨビ コツ タイシャ ・ コツミツド ノ シーズン ヘンカ ニ ツイテ ノ ジュウダンテキ ケンキュウ

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Abstract

The aim of this study was to investigate the seasonal variation of bone metabolism and bone mineral density in male alpine skiers. Ten alpine skiers（male 20.6±1.6 year）were measured body weight, percent body fat, lean body mass, body mass index（BMI），body mineral density（BMD），serum levels of osteocalcin（OC）， bone alkaline phosphatase（BAP），tartrate-resistant acid phosphatase 5b（TRACP-5b），parathormone, and 25- hydroxyvitamin D（25（OH）D）．Measurements were conducted in pre-competitive season（T1），competitive season（T2），post-competitive season（T3），and second pre-competitive season（T4）．Percent body fat was significantly increased from T1 to T3 and T4, BMI was also significantly increased from T1 to T4. Although no significant differences were observed BMD, BAP and OC were significantly decreased from T1 to T2 and T3, TRACP-5b was significantly decreased from T2 to T4. The coupling index of bone metabolism, which means the ratio of bone resorption and bone formation were also significantly decreased from T1 to T2 and T3. Since bone formation and coupling index were significantly decreased from T1 to T3, we suggest that bone metabolism of male alpine skiers was close to severe condition because of consecutive competitions. We conclude that skiers, it is necessary for male alpine to monitor the bone metabolism markers with BMD throughout the year.

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