Carbohydrate dependence during marathon running.
Carbohydrate dependence during marathon running.
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马拉松跑步期间的碳水化合物依赖性。
DOI：
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发表时间：
1993
影响因子：
4.1
通讯作者：
George A. Brooks
中科院分区：
文献类型：
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作者：
MARK J. O??BRIEN;C. Viguie;R. S. Mazzeo;George A. Brooks
为了检验马拉松跑依赖于脂质氧化的假设，12名吸收后男性（31.9 +/- 2.1岁）跑了一个跑步机马拉松和底物利用进行了评估。受试者被分为快速（F ≤ 2小时，45分钟; 73.3%VO2max）或慢速（S ≤ 3小时，45分钟; 64.5%VO2max）马拉松组。测试前一天，受试者休息，但吃正常的饮食。受试者在整夜禁食后的早晨进行测试，并且在运动期间仅以1 l. h的速率摄入自来水。血糖浓度在运动开始时升高，在大约1小时时达到峰值，但随后随着时间的推移而降低，保持在或高于静息水平。游离脂肪酸和甘油不断上升。在马拉松过程中，F组和S组的血浆FFA、甘油或血糖浓度无显著差异。在运动过程中，F组的平均血乳酸浓度（2.1 +/- 0.3 mM）显著高于S组（1.2 +/- 0.2 mM）（P < 0.05）。F组的平均血浆肾上腺素（0.9 +/- 0.2 ng. ml-1）显著高于S组（0.6 +/- 0.2 ng. ml-1）; F组的去甲肾上腺素（3.9 +/- 1.4 ng.ml-1）也高于S组（2.5 +/- 0.9 ng.ml-1，P <或= 0.05）。血乳酸和肾上腺素浓度显著相关（F组和S组的4 r分别为0.76和0.78）。（250字处删节）
To test the hypothesis that marathon running is dependent on lipid oxidation, 12 post-absorptive males (31.9 +/- 2.1 yr) ran a treadmill marathon and substrate utilization was assessed. Subjects were placed into a fast (F < or = 2 hr, 45 min; 73.3% VO2max), or a slow (S < or = 3 hr, 45 min; 64.5% VO2max) marathon group. The day before testing subjects rested, but ate their normal diet. Subjects were tested in the morning after an overnight fast, and only tap water, at a rate of 1 l.h, was ingested during exercise. Blood glucose concentration rose at exercise onset, peaked at approximately an hour, but then decreased over time remaining at or above resting levels. Free fatty acids and glycerol rose continuously. No significant differences in plasma FFA, glycerol, or blood glucose concentrations were observed between F or S groups during the marathon. Mean blood lactate concentration was significantly higher (P < 0.05) in the F (2.1 +/- 0.3 mM) group than the S (1.2 +/- 0.2 mM) during exercise. Mean plasma epinephrine was significantly higher in the F (0.9 +/- 0.2 ng.ml-1) than the S (0.6 +/- 0.2 ng.ml-1) group; norepinephrine was also higher in F (3.9 +/- 1.4 ng.ml-1) than the S (2.5 +/- 0.9 ng.ml-1, P < or = 0.05). Blood lactate and epinephrine concentrations correlated significantly (4r = 0.76 and 0.78 in F and S groups, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)