目標心拍数を設定した階段上り運動の糖代謝特性とトレーニング効果

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  • モクヒョウ シンパクスウ オ セッテイ シタ カイダン ノボリ ウンドウ ノ トウ タイシャ トクセイ ト トレーニング コウカ
  • Characteristics of Glycolytic Metabolism of Stair Climbing Exercise with Target Heart Rate and Its Training Effects on Body Composition and Endurance Ability in Female College Students

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Abstract

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本研究は,目標心拍数を設定した階段上り運動を行い,エネルギー産生における糖代謝の貢献について検討した.カルボーネン法から最大心拍数の65～75%に相当する目標心拍数と目標タイムを設定し,血中乳酸濃度(BLa)と血中グルコース濃度(Glu)を測定した.対象者は60段の階段を上り,1分間の休息を挟んで8セット反復した.その結果,運動中のGluは一定に保たれ,BLaはセットごとに増加した.また,この運動を週3回,3週間継続した結果,全身持久力は向上したが,身体組成および脚筋持久力に変化はなかった.本研究の階段上り運動は全力発揮ではないが,BLaが16mMを示すなど,骨格筋内の解糖系代謝を活性化させることが示唆された.

The purpose of this study was to investigate the contribution of glycolytic metabolism by stair climbing exercise with a target heart rate as a high-intensity intermittent exercise (HIIT). In addition, we set training period for 3 weeks with 3 times per week and examined the effects on the body composition and endurance performance. The subjects (7 female college students with no exercise habit) climbed 60-steps stairs in approximately 17.5 seconds, rested for 1 minute, and then climbed again, repeating 8 times. The target heart rate corresponding to 65-75% of each subject's maximum heart rate was calculated by the Karvonen Formula, and a target time was set for each subject. After fourth trials, heart rate, blood lactate concentration (BLa) and blood glucose concentration (Glu) were measured during the stair climbing exercise. As a result, in the stair-climbing HIIT with a target heart rate, the time was kept constant and Glu also remained at a steady value. On the other hand, BLa increased with each repetition and showed 16 mM at the 8th repetition. It suggested that stair climbing exercise could specifically activate glycolytic metabolism in the leg muscles. Thus, metabolic utilization of muscle glycogen was particularly enhanced. As on 3 weeks training effects, the body composition was unchanged and endurance performance was increased. Although the stair climbing HIIT in this study was not an all-out exertion exercise, with an average heart rate of 160 bpm, it was suggested to activate glycolytic metabolism in skeletal muscles.

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