Peters H P, van Schelven W F, Verstappen P A, de Boer R W, Bol E, Erich W B, van der Togt C R, de Vries W R
Department of Medical Physiology and Sports Medicine, University of Utrecht, The Netherlands.
Int J Sports Med. 1995 Feb;16(2):105-13. doi: 10.1055/s-2007-972974.
Aim of this study was to examine the effects of a semi-solid and a liquid carbohydrate feeding on exercise performance. Thirty-two male triathletes performed three exercise trials (3 hours maximal at 75% VO2max) with either a semi-solid feeding (S), an iso-caloric liquid feeding (F) or a liquid placebo (P). Exercise consisted of cycling (bout 1 and 3) and running (bout 2 and 4). Survival analysis revealed that the median maximum test time (MTT) with F, S and P was 180, 126 and 120 min, respectively. Median MTT was longer with F than with S (sign-test; p < 0.05) or P (p < 0.001), with no difference between S and P. Mean power output during supra-maximal tests after bout 2 (W1) and at the end of exercise (Wend) were 371, 365, 362 and 334, 332, 321 W with F, S and P, respectively. Differences between F and P were significant (p < 0.01). Regression analysis identified five variables that were associated with 93% of the variance in MTT. The variance in W1 was explained for 83% by three variables. Wend was explained (90%) by three variables. A significant dietary contribution to MTT and Wend was found, but not to W1. This suggests that the influence of the feedings on performance is different among performance tests.
本研究的目的是检验半固体和液体碳水化合物喂养对运动表现的影响。32名男性铁人三项运动员进行了三项运动试验（在75%最大摄氧量下进行3小时的最大运动），分别采用半固体喂养（S）、等热量液体喂养（F）或液体安慰剂（P）。运动包括骑行（第1和3回合）和跑步（第2和4回合）。生存分析显示，F、S和P组的最大测试时间中位数（MTT）分别为180、126和120分钟。F组的MTT中位数长于S组（符号检验；p<0.05）或P组（p<0.001），S组和P组之间无差异。在第2回合后（W1）和运动结束时（Wend）的超最大测试期间，F、S和P组的平均功率输出分别为371、365、362瓦和334、332、321瓦。F组和P组之间的差异显著（p<0.01）。回归分析确定了五个与MTT中93%的方差相关的变量。W1中的方差由三个变量解释了83%。Wend由三个变量解释（90%）。发现饮食对MTT和Wend有显著贡献，但对W1没有。这表明不同运动测试中喂养对表现的影响有所不同。
