Ballard Tasha P, Melby Christopher L, Camus Heidi, Cianciulli Matthew, Pitts Julie, Schmidt Stacy, Hickey Matthew S
Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO 80523, USA.
Metabolism. 2009 Aug;58(8):1191-9. doi: 10.1016/j.metabol.2009.03.018. Epub 2009 Jun 18.
The effects of resistance exercise with and without carbohydrate (CHO) supplementation on hunger, postexercise food intake, and plasma ghrelin, an orexigenic gastric peptide, are poorly characterized. We examined the individual and combined effects of a resistance exercise bout and CHO consumption on plasma ghrelin and postexercise food intake. Twenty-one apparently healthy young male participants ([mean +/- SD] age = 20 +/- 1.8 years, body mass index = 24.8 +/- 3.3 kg/m(2)) completed in random order 3 treatment conditions: (1) ExCHO-80-minute resistance exercise bout while consuming CHO ( approximately 77 g CHO, 306 kcal); (2) ExPLA-identical exercise with a non=caloric placebo; and (3) NoExCHO-no-exercise trial of quiet sitting and CHO consumption. Blood samples were obtained before, during, and immediately postexercise, and 110 minutes after exercise. At 2 hours postexercise, they were provided a buffet of food from which they ate ad libitum. There was a significant time x treatment interaction for plasma ghrelin caused by a decline from pre- to postexercise in the 2 exercise conditions compared with an increase over time in the NoExCHO condition. At 110 minutes postexercise, ghrelin was 21% and 13% lower in ExCHO and ExPLA compared with NoExCHO (both Ps < .05). However, despite the lower ghrelin concentrations for the 2 exercise conditions, the subjective ratings of hunger were not lower for these conditions compared with the NoExCHO. There were no differences in absolute ad libitum energy intake from the buffet among the 3 conditions, but relative energy intake from the buffet accounting for the estimated cost of exercise was lowest among the 2 exercise conditions. We conclude that (1) weight lifting lowers plasma ghrelin concentrations during exercise and attenuates its rise during the postexercise period in young men and (2) the lower plasma ghrelin concentration is not associated with lower subjective feelings of hunger measured 100 minutes postexercise, but is associated with a lower relative food intake.
有或没有补充碳水化合物（CHO）的抗阻运动对饥饿感、运动后食物摄入量以及血浆胃饥饿素（一种促食欲的胃肽）的影响，目前尚未得到充分研究。我们研究了一次抗阻运动和摄入CHO对血浆胃饥饿素及运动后食物摄入量的单独和联合影响。21名表面健康的年轻男性参与者（[平均±标准差]年龄 = 20±1.8岁，体重指数 = 24.8±3.3 kg/m²）按随机顺序完成3种治疗条件：（1）ExCHO - 进行80分钟抗阻运动的同时摄入CHO（约77 g CHO，306千卡）；（2）ExPLA - 进行相同运动并摄入无热量安慰剂；（3）NoExCHO - 安静坐着并摄入CHO的非运动试验。在运动前、运动期间、运动后即刻以及运动后110分钟采集血样。运动后2小时，为他们提供自助餐，让他们随意进食。与NoExCHO条件下随时间增加相比，两种运动条件下运动前到运动后血浆胃饥饿素出现下降，导致血浆胃饥饿素存在显著的时间×治疗交互作用。运动后110分钟，与NoExCHO相比，ExCHO和ExPLA中的胃饥饿素分别低21%和13%（P均<0.05）。然而，尽管两种运动条件下胃饥饿素浓度较低，但与NoExCHO相比，这些条件下的主观饥饿评分并未降低。三种条件下从自助餐中随意摄入的绝对能量没有差异，但在两种运动条件下，考虑运动估计消耗后从自助餐中摄入的相对能量最低。我们得出结论：（1）举重运动可降低年轻男性运动期间的血浆胃饥饿素浓度，并减弱运动后期间其升高幅度；（2）较低的血浆胃饥饿素浓度与运动后100分钟测量的较低主观饥饿感无关，但与较低的相对食物摄入量有关。
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