The influence of post-exercise macronutrient intake on energy balance and protein metabolism in active females participating in endurance training

被引:23
作者
Roy, BD [1 ]
Luttmer, K
Bosman, MJ
Tarnopolsky, MA
机构
[1] McMaster Univ, Dept Med, Hamilton, ON L8N 3Z5, Canada
[2] McMaster Univ, Dept Kinesiol, Hamilton, ON L8N 3Z5, Canada
来源
INTERNATIONAL JOURNAL OF SPORT NUTRITION AND EXERCISE METABOLISM | 2002年 / 12卷 / 02期
关键词
nitrogen balance; post-exercise nutrition; exercise performance;
D O I
10.1123/ijsnem.12.2.172
中图分类号
R15 [营养卫生、食品卫生]; TS201 [基础科学];
学科分类号
100403 ;
摘要
The purpose of this investigation was to determine the influence of post-exercise macronutrient intake on weight loss, protein metabolism, and endurance exercise performance during a period of increased training volume. Ten healthy young female endurance athletes performed 4 60-min bouts of cycle ergometry at similar to65% of VO2peak on 4 days (day 1, 3, 4, and 6) during 2 separate 1-week periods. On day 7, participants performed a ride to exhaustion at similar to75% of VO2peak One of the 7-day periods served as a control condition, where a placebo beverage was consumed following the exercise bouts on days 1, 3, 4, and 6 (CON). During the other 7-day protocol (POST), participants consumed a predefined formula beverage with added carbohydrate following the exercise bouts on days 1, 3, 4, and 6. Energy intake and macronutrient proportions were the same between the 2 trials; the only difference was the timing at which the macronutrients were consumed. Calculated fat oxidation was greater during exercise on day 6 during POST as compared to CON (p <.05). Glucose and insulin concentrations were significantly higher (p <.05) following exercise during POST as compared to CON. There was a trend (p =.06) for nitrogen balance to be greater on days 5 and 6 with POST as compared to CON. Time to exhaustion during exercise on day 7 was longer during POST as compared to CON (p <.05). POST resulted in a maintenance of body weight during the 7-day protocol, while there was a significant (p <.05) reduction with CON. It was concluded that post-exercise macronutrient intake following endurance exercise can attenuate reductions in body weight and improve nitrogen balance during 7 days of increased energy expenditure. Importantly, post-exercise supplementation improved time to exhaustion during a subsequent bout of endurance exercise.
引用
收藏
页码:172 / 188
页数:17
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