Effect of carbohydrate ingestion and ambient temperature on muscle fatigue development in endurance-trained male cyclists

Chris R. Abbiss, Jeremiah J. Peiffer, Jonathan M. Peake, Kazunori Nosaka, Katsuhiko Suzuki, David T. Martin, Paul B. Laursen

研究成果: Article査読

26 被引用数 (Scopus)

抄録

The aim of the present study was to determine the effect of carbohydrate (CHO; sucrose) ingestion and environmental heat on the development of fatigue and the distribution of power output during a 16.1-km cycling time trial. Ten male cyclists (V̇O2max = 61.7 ± 5.0 ml·kg -1 ·min-1, mean ± SD) performed four 90-min constant-pace cycling trials at 80% of second ventilatory threshold (220 ± 12 W). Trials were conducted in temperate (18.1 ± 0.4°C) or hot (32.2 ± 0.7°C) conditions during which subjects ingested either CHO (0.96 g·kg-1 ·h-1) or placebo (PLA) gels. All trials were followed by a 16.1-km time trial. Before and immediately after exercise, percent muscle activation was determined using superimposed electrical stimulation. Power output, integrated electromyography (iEMG) of vastus lateralis, rectal temperature, and skin temperature were recorded throughout the trial. Percent muscle activation significantly declined during the CHO and PLA trials in hot (6.0 and 6.9%, respectively) but not temperate conditions (1.9 and 2.2%, respectively). The decline in power output during the first 6 km was significantly greater during exercise in the heat. iEMG correlated significantly with power output during the CHO trials in hot and temperate conditions (r = 0.93 and 0.73; P < 0.05) but not during either PLA trial. In conclusion, cyclists tended to self-select an aggressive pacing strategy (initial high intensity) in the heat.

本文言語English
ページ(範囲)1021-1028
ページ数8
ジャーナルJournal of Applied Physiology
104
4
DOI
出版ステータスPublished - 2008 4

ASJC Scopus subject areas

  • 生理学
  • 生理学(医学)

フィンガープリント

「Effect of carbohydrate ingestion and ambient temperature on muscle fatigue development in endurance-trained male cyclists」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル