2020年10月
Caffeine Exacerbates Hyperventilation and Reductions in Cerebral Blood Flow in Physically Fit Males Exercising in the Heat
Medicine and science in sports and exercise
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- 巻
- 53
- 号
- 4
- 開始ページ
- 845
- 終了ページ
- 852
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1249/MSS.0000000000002537
- 出版者・発行元
- LIPPINCOTT WILLIAMS & WILKINS
[INTRODUCTION] Caffeine is an exercise performance enhancer widely used by individuals engaged in training or competition under heat-stressed conditions. Caffeine ingestion during exercise in the heat is believed to be safe, since it does not greatly affect body temperature responses, heart rate or body fluid status. However, it remains unknown whether caffeine affects hyperthermia-induced hyperventilation or reductions in the cerebral blood flow index. We tested the hypothesis that under conditions inducing severe hyperthermia, caffeine exacerbates hyperthermia-induced hyperventilation and reduces the cerebral blood flow index during exercise.
[METHODS] Using a randomized, single-blind, crossover design, twelve physically active healthy young males (23±2 years) consumed a moderate dose of caffeine (5 mg/kg) or placebo in the heat (37°C). Approximately 60 min after the ingestion, they cycled for ~45 min at a workload equal to ~55% of their pre-determined peak oxygen uptake (moderate intensity) until their core temperature increased to 2.0°C above its pre-exercise baseline level.
[RESULTS] In both trials, ventilation increased and the cerebral blood flow index assessed by middle
[METHODS] Using a randomized, single-blind, crossover design, twelve physically active healthy young males (23±2 years) consumed a moderate dose of caffeine (5 mg/kg) or placebo in the heat (37°C). Approximately 60 min after the ingestion, they cycled for ~45 min at a workload equal to ~55% of their pre-determined peak oxygen uptake (moderate intensity) until their core temperature increased to 2.0°C above its pre-exercise baseline level.
[RESULTS] In both trials, ventilation increased and the cerebral blood flow index assessed by middle
- リンク情報
- ID情報
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- DOI : 10.1249/MSS.0000000000002537
- ISSN : 1530-0315
- PubMed ID : 33044440