長時間の自転車こぎ運動時における糖質摂取パターンの違いがパフォーマンスと代謝に及ぼす影響

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This study examined influence of carbohydrate ingestion patten on performance and metabolism inprolonged bicycle exercise. Six male subjects cycled at lactate threshold level for 90min. Immediatelyafter the prolonged exercise，the subjects were given performance test in which time to exhaustionwas measured during bicycle exercise demanding oxygen consumption the double of lactate thresholdlevel. During the prolonged exercise the subjects ingested either 10% carbohydrate (CHO) drink，5%CHO drink，or water every 15min on five pattens; 1) 10%CHO drink at the first half followed bywater at the second half，2) 5%CHO drink at the first half and water at the second half，3) 5%CHOdrink throughout exercise period，4) water at the first half followed by 10% CHO drink at the secondhalf，5) water at the first half and 5%CHO drink at the second half. When CHO drink was ingested atthe first half，plasma glucose was significantly higher at 60min from the beginning of exercise thanthat of the patten where CHO was ingested on the second half.There was not a significant differencein blood glucose level at the end of the prolonged exercise，with the values being around 5mMirrespective of the ingestion pattens. The different ingestion patterns induced no significantdifferences in performance time，the amount of CHO oxidized，and such gas parameters as oxygenconsumption，minutes ventilation，respiratory exchange ratio.