大学競泳選手における骨格筋量の特徴 ―専門種目，利き腕・脚，キックスタート構え時の前脚後脚の選択に着目して―

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  • Characteristics of skeletal muscle mass in collegiate swimmers : focusing on individual specialty stroke, dominant arm/leg, and selection of fore-leg and rear-leg on kick-start
  • ダイガク キョウエイ センシュ ニ オケル コッカクキンリョウ ノ トクチョウ : センモン シュモク,キキウデ ・ アシ,キックスタート カマエ ジ ノ マエアシ アトアシ ノ センタク ニ チャクモク シテ

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The purpose of this study was to measure the lean mass (LM) of collegiate swimmers using DXA method, and to investigate whether the selection of the front-leg and rear-leg in a kick start stance is related to muscle mass. In addition, since it is expected that the swimmer's effective side is affected by the choice of fore-leg and rear-leg, the relationship between the dominant arm and the dominant leg and muscle mass was also examined. The subjects were 30 competitive collegiate swimmers, and LM measured using DXA method was used as an index of muscle mass. The subjects were also examined in terms of their specialty, dominant arm and leg, and fore-leg and rear-leg on the kick-start stance. Results showed that there were no significant differences in the percentage of each region's LM among the specialized disciplines (all p ≥ 0.05). As the reason, it was speculated that the training in competitive swimming may be influenced to this result. No significant difference was observed between the dominant and non-dominant sides in the LM of the upper and lower limbs, but the LM of the dominant side of the arm and leg tended to be slightly higher than that of the non-dominant side (p = 0.06 and p = 0.07, respectively). Furthermore, there was no significant difference between the LM of the foreleg and rear- leg on the kick-start stance, suggesting that the choice of fore-leg or rear-leg was not related to muscle mass. The selection of the fore-leg and the rear-leg with consideration of muscle mass may improve the muscle power exerted on the kick-start stance and lead to an improvement in the starting performance of the athletes.

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