Bassami Minoo, Maclaren Donald P M, Ahmadizad Sajad, Doran Dominic
Department of Sports and Exercise Physiology, Sports Science Research Centre, Ministry of Science, Research and Technology, 1587958711 Tehran, Iran.
J Nutr Metab. 2011;2011:172853. doi: 10.1155/2011/172853. Epub 2011 May 24.
The present study was designed to investigate the effects of four different meals on fat and CHO metabolism during subsequent exercise in elderly males. Eight healthy males (age: 63.3 ± 5.2 years) reported to the physiology laboratory on four separate occasions, each of which was allocated for the performance of a 30-minute exercise on a cycle ergometer at 60% [Formula: see text] after having normal (N), high fat (HF), high carbohydrate high glycaemic index (HGI) and high carbohydrate low glycaemic index (LGI) meals. Fat oxidation during exercise after the meals (HF = 0.26 ± 0.04 g/min; N = 0.21 ± 0.04 g/min; HGI = 0.22 ± 0.03 g/min; LGI = 0.19 ± 0.03 g/min) was not significant (P > .05), and neither were the rates of carbohydrate oxidation (N = 1.79 ± 0.28, HF = 1.58 ± 0.22, HGI = 1.68 ± 0.22, and LGI = 1.77 ± 0.21 g/m). NEFA concentration increased after HF (P < .05) but decreased after HGI and LGI (P < .05). Glucose concentration decreased as a result of exercise after HF, and LGI (P < .05) whereas insulin concentration decreased significantly during exercise after N, HF, and HGI (P < .05). It can be concluded that, in elderly males, feeding isoenergetic meals containing different proportions of carbohydrate and fat do not significantly alter oxidation of fat and CHO during exercise in spite of changes in some circulating metabolites.
本研究旨在调查四种不同膳食对老年男性随后运动期间脂肪和碳水化合物代谢的影响。八名健康男性（年龄：63.3±5.2岁）分四次前往生理实验室，每次均在食用正常（N）餐、高脂肪（HF）餐、高碳水化合物高血糖指数（HGI）餐和高碳水化合物低血糖指数（LGI）餐之后，以60%[公式：见正文]的强度在自行车测力计上进行30分钟的运动。餐后运动期间的脂肪氧化（HF=0.26±0.04克/分钟；N=0.21±0.04克/分钟；HGI=0.22±0.03克/分钟；LGI=0.19±0.03克/分钟）无显著差异（P>.05），碳水化合物氧化率也无显著差异（N=1.79±0.28，HF=1.58±0.22，HGI=1.68±0.22，LGI=1.77±0.21克/分钟）。HF餐后非酯化脂肪酸（NEFA）浓度升高（P<.05），而HGI餐和LGI餐后降低（P<.05）。HF餐和LGI餐后运动导致葡萄糖浓度降低（P<.05），而N餐、HF餐和HGI餐后运动期间胰岛素浓度显著降低（P<.05）。可以得出结论，在老年男性中，尽管一些循环代谢物发生了变化，但提供含有不同碳水化合物和脂肪比例的等能量膳食并不会显著改变运动期间脂肪和碳水化合物的氧化。
