This study examined the effects of Sago (Sa), Soy (So), combined iso–caloric Sago+Soy (SS) supplementations during cycling on metabolic responses as compared to placebo (P) in the heat (31℃, 70% relative humidity). Twelve well–trained male cyclists (Age: 19.0±5.6 yr, Height: 170.8±7.6 cm, Wight: 60.1±11.2 kg, and VO2max: 56.5±6.5 mL.kg-1.min-1) participated in four experimental trials. The design of the trials was a randomized single–blind, placebo–controlled crossover trail comprising 90 min of steady–state cycling on an ergometer at 60% of VO2max followed by a 20–km time trial performance (TT). The participants of the study were supplemented 5 times at 0, 20, 40, 60, and 80 minutes during the steady–state cycling. Sa, So, and SS supplements provided 7.5% Sago, 7.5% Soy, and 6.0% Sago + 1.5% Soy respectively. Plasma glucose concentrations (PG) reached a peak at 60 min after ingestion of Sa and SS as compared to baseline. At the end of the TT, PG reduced significantly to the baseline level. Plasma insulin concentrations (PI) increased in all trials, but reduced gradually to the baseline level. The concentration of plasma free fatty acids (FFA) increased gradually during the steady–state cycling and TT, and FFA was significantly higher in the P and So than the Sa and SS trials. At the end of the steady–state cycling, the plasma lactate concentration (LACT) reached its lowest concentrations and at the end of the TT was enhanced significantly in all trials. These results suggest that sago and soy supplements increase the PG and PI during endurance exercise in the heat. These data add to the growing body of knowledge concerning endurance athletes’ glycemic and insulinemic responses to carbohydrate consumptions during exercise in the heat.

中文翻译：

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耐高温热循环过程中对西米和大豆补充的代谢反应

这项研究检查了西米（Sa），大豆（So），等热量的西米+大豆（SS）补充在循环过程中对代谢反应的影响，与热量中的安慰剂（P）相比（31％，70％相对湿度）。十二个训练有素的男性自行车运动员（年龄：19.0±5.6年，身高：170.8±7.6厘米，体重：60.1±11.2千克，最大摄氧量：56.5±6.5 mL.kg-1.min-1）参加在四个实验中 试验的设计是随机的单“盲，安慰剂”对照交叉试验，包括在ergometer上以90％VO2max进行90分钟稳态循环，然后进行20公里的时间试验性能（TT）。在稳态自行车运动中，在0、20、40、60和80分钟对研究参与者进行了5次补充。Sa，So和SS补品分别提供了7.5％的西米，7.5％的大豆和6.0％的西米+ 1.5％大豆。与基线相比，摄入Sa和SS后60分钟时血浆葡萄糖浓度（PG）达到峰值。在TT结束时，PG显着降低至基线水平。在所有试验中血浆胰岛素浓度（PI）均升高，但逐渐降低至基线水平。血浆游离脂肪酸（FFA）的浓度在稳态循环和TT过程中逐渐增加，P和So中的FFA显着高于Sa和SS试验。在稳态循环结束时，所有试验中血浆乳酸浓度（LACT）达到最低浓度，TT结束时血浆乳酸浓度显着提高。这些结果表明，西米和大豆补充剂可在耐高温运动中增加PG和PI。