Effects of pre-exercise ingestion of carbohydrate on glycaemic and insulinaemic responses during subsequent exercise at differing intensities
Effects of pre-exercise ingestion of carbohydrate on glycaemic and insulinaemic responses during subsequent exercise at differing intensities
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DOI：
10.1007/s00421-002-0730-1
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发表时间：
2003-01-01
影响因子：
3
通讯作者：
Jeukendrup, AE
中科院分区：
文献类型：
--
作者：
Achten, J;Jeukendrup, AE
在运动前碳水化合物（CHO）在某些研究中摄入后，反弹性低血糖的发展已有报道，但在其他研究中却没有。实验设计和诸如运动强度等因素的差异可能是这些研究之间差异的原因。运动强度可能是关键因素，因为它会影响胰岛素血症和葡萄糖摄取。因此，本研究的目的是比较摄入标准化的运动前CHO负载后，对运动的血糖和胰岛素血症反应。八名受训练的受试者在运动20分钟前以40％，65％或80％的最大功率输出消耗了75克葡萄糖45分钟。在葡萄糖摄入前收集血液样本，在静止时间间隔15分钟，运动过程中5分钟的间隔。在锻炼过程中，连续进行心率的测量和呼吸呼吸的呼吸分析。试验是在[平均（SEM）] 55（1），77（1）和90（1）百分比上进行的最大氧气吸收。运动开始时，血浆葡萄糖浓度恢复到前含量水平，而胰岛素浓度平均比休息时间高三倍以上[57（7），而16（1）muu（。）ML（-1） ）。在运动过程中，血浆葡萄糖浓度在运动的前5分钟内降低，然后在所有试验中以不被认为是降血糖的浓度稳定。运动过程中三个试验之间的葡萄糖或胰岛素浓度没有显着差异。这些数据表明，在行使不同强度的过程中，血糖对摄入45分钟45分钟45分钟的血糖反应相似。
The development of rebound hypoglycaemia has been reported after pre-exercise carbohydrate (CHO) ingestion in some studies but not in others. Differences in the experimental design and factors such as the exercise intensity are likely to be responsible for the discrepancies between these studies. Exercise intensity might be a crucial factor since it affects both insulinaemia and glucose uptake. Therefore the aim of the present study was to compare the glycaemic and insulinaemic responses to exercise at different intensities after ingestion of a standardized pre-exercise CHO load. Eight moderately trained subjects consumed 75 g of glucose 45 min prior to 20 min of exercise at 40%, 65% or 80% maximal power output. Blood samples were collected before glucose ingestion, at 15 min intervals at rest and 5 min intervals during exercise. During exercise, measurements of heart rate and breath-by-breath analysis of expired gas were performed continuously. The trials were performed at [mean (SEM)] 55 (1), 77 (1) and 90 (1) percentages maximal oxygen uptake. At the onset of exercise, plasma glucose concentration returned to pre-ingestion levels, while the insulin concentration was more than three times higher than at rest [on average 57 (7) compared to 16 (1) muU(.)ml(-1)). During exercise, plasma glucose concentrations decreased during the first 5 min of exercise and then stabilized in all trials at concentrations that would not be considered to be hypoglycaemic. There were no significant differences in glucose or insulin concentrations between the three trials during exercise. These data suggest that the glycaemic response to ingestion of 75 g of CHO 45 min pre-exercise is similar during exercise of different intensities.