High-intensity exercise performance is not impaired by low intramuscular glycogen.
High-intensity exercise performance is not impaired by low intramuscular glycogen.
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低肌内糖原不会损害高强度运动表现。
DOI：
10.1249/00005768-198910000-00009
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发表时间：
1989
影响因子：
4.1
通讯作者：
I. Jacobs
中科院分区：
文献类型：
--
作者：
J. Symons;I. Jacobs
本研究的目的是评估糖原可用性对短期高强度运动表现的影响。8名男性完成了性能评估任务（PET），包括最大等速力量和耐力，等速力量和腿伸肌的电诱发力，在两种情况下各两次。在对照条件(C)的第1天（D1），受试者进行PET，然后进行旨在消耗腿伸肌糖原储存的剧烈运动。混合饮食48小时（第2天和第3天）后，第4天再次进行PET （D4）。实验条件(E)与C相同，但在第2天和第3天严格控制低碳水化合物饮食。在D4 PET检查前，股外侧肌活检证实了肌内糖原（426 +/- 43 vs 153 +/- 60 mmol葡萄糖单位）的差异。C和E分别为kg-1 d.w., P < 0.001)。PET结果在D4条件下无差异，在D1和D4条件下也无差异。静息血糖、指示水合和酸碱状态的血液学变量以及PET后血乳酸在所有试验中都是相似的。由此得出结论，糖原耗尽的腿伸肌的短期高强度运动性能不会受到损害。
The purpose of this study was to evaluate the effects of glycogen availability on short-term, high-intensity exercise performance. Eight males completed performance evaluation tasks (PET) consisting of maximum isokinetic strength and endurance, isometric strength, and electrically evoked force of the leg extensors, twice during each of two conditions. On day 1 (D1) of the control condition (C) subjects performed the PET, followed by strenuous exercise designed to deplete glycogen stores of the leg extensors. After consuming a mixed diet for 48h (days 2 and 3) they performed the PET again on day 4 (D4). The experimental condition (E) was identical to C, except that a strictly controlled low carbohydrate diet was consumed during Days 2 and 3. Biopsies from the vastus lateralis before the PET on D4 confirmed differences between conditions in intramuscular glycogen (426 +/- 43 vs 153 +/- 60 mmol glucose units.kg-1 d.w. for C and E respectively, P less than 0.001). Results obtained from the PET were not different between conditions on D4, nor within conditions when D1 and D4 were compared. Resting blood glucose, hematological variables indicative of hydration and acid-base status, and post PET blood lactate were similar for all trials. It is concluded that short-term, high-intensity exercise performance of glycogen depleted leg extensors is not impaired.