بررسی اثر کربوهیدرات تکمیلی با نمایه گلیسمی متفاوت ، قبل از شروع فعالیت ورزشی بر زمان بروز خستگی و توان هوازی ورزشکاران استقامتی

Although, it is known that feeding with carbohydrate (CHO) during&nbsp;exercise improves endurance performance, the effects of glycemic&nbsp;index (GI ) of carbohydrate intake are less clear. This study was carried out&nbsp;to assess the effect of glycemic index of pre-exercise carbohydrate feeding&nbsp;on endurance exercise capacity. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;In a randomized clinical trial 52 endurance &ndash; trained men with mean&nbsp;age 21.7 &plusmn; 3 years, weight 69.3 &plusmn; 9 kg, height 178.4 &plusmn; 2 cm and BMI 22.6 &plusmn; 2&nbsp;were studied. Subjects performed exercise treadmill at 70% VO2max after&nbsp;ingestion: Lentil, a low glycemic index; potato, a high glycemic index;&nbsp;glucose and water (as a control) one hour before exercise. Blood samples&nbsp;were collected before and one hour after test meal and 30 minutes after &nbsp;&nbsp;exercise. To assess aerobic capacity VO2max (maximum oxygen uptake)&nbsp;was measured at the end of the exercise trial. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Endurance time was found to be longer after lentil than after the&nbsp;potato, glucose and control respectively (P < 0.05). At the end of exercise,&nbsp;the glucose group and control both gave lower plasma glucose&nbsp;concentrations. Changes of VO2max in lentil. Potato, glucose and control&nbsp;group which were not statistically significant. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;This study showed that a low GI meal eaten before an event increases&nbsp;endurance capacity during exercise. Furthermore, the low GI meal was&nbsp;found to maintain glucose at higher concentrations during the later stages&nbsp;of exercise.