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2005.07.12

キャッチャーは人差し指に注意!

米国週間健康ニュースより「キャッチャーの手に非可逆性の外傷

メジャー、マイナーリーグを問わず、典型的なプロ野球の試合では、キャッチャーは時速145kmを超えるボールを約150球受け止める。試合前の練習を併せると、受け止めるボール数は1日300球に上る。キャッチャーの手はこのように繰り返し強打されることによって、特に人差し指に長期にわたって非可逆性の障害を引き起こすことが研究で明らかになり、医学誌「Bone & Joint Surgery」7月号に掲載された。
キャッチャーこれまでの研究結果ではキャッチャーが最も恐れるのは手のひらの動脈に生じる凝血でした。しかし、近年の良質なグローブの発達により、キャッチャーが受けるダメージの部位が変わってきているようです。

米ウェイク・フォレスト大学医学部整形外科教授のAndrew Koman博士らはマイナーリーグの現役プロ野球選手36名(キャッチャー9名、内野手7名、外野手5名、ピッチャー15名)を対象に手の状態などを調べました。超音波による検査やアレンテストなどの検査を行い、手袋をはめた手と投げる方の手、打者と打撃をしない投手、そしてそれぞれの守備位置などにより結果を比較。

その結果、手に疼痛やしびれ、脱力感、チクチク感など何らかの症状を報告したのは全体で11名(36%)。そのうちキャッチャーに症状が認められる傾向が強く、44%がボールを受ける方の手に脱力感を感じると報告したとのこと。

同じように手の脱力感を報告したのはピッチャー7%、内野手または外野手では17%でした。

キャッチャーが受けるダメージの多くは人差し指に見られたということです。

進行すると今は何ともなくても年をとるにしたがい手の機能や神経などに影響が及ぶ可能性があります。

Koman博士は、指ではなく手掌の外傷が予測されていたため、この所見は驚きであったという。人差し指をグローブの外に出していることが損傷の原因ではないかとした上で、「この試験結果がきっかけとなり、人差し指に及ぶ影響が着目され、キャッチャーが人差し指を保護する一助となることが期待される」と述べている。
これを保護するようなミットの開発が進めばいいのですが。

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