EFFECTS OF CHO ON PERCEIVED EXERTION AND BLOOD LACTATE RESPONSE TO EXERCIS

这个子项目是许多利用 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 运动处方技术目前基于最大耗氧量和对运动的血乳酸反应的评估。 由于需要血液样本和经过培训的人员进行乳酸盐评估，因此已将感知用力（RPE）评级用作运动处方技术，因为RPE已被证明可准确产生特定的血液乳酸盐浓度。乳酸阈值（LT）定义为运动期间血乳酸蓄积之前达到的最高工作负荷。 在对应于高于LT的血液乳酸盐浓度的RPE下训练导致与表现相关的生理变量的改善。 在运动前和运动中摄入碳水化合物也能改善运动成绩。 由于对碳水化合物补充对血液乳酸盐-RPE关系的影响知之甚少，本研究将评估碳水化合物补充是否影响这种关系。 我们假设血液乳酸盐-RPE的关系将随着碳水化合物的摄入而改变，从而影响RPE在运动期间产生给定血液乳酸盐的使用。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Exercise prescription techniques are currently based on assessment of maximal oxygen consumption and the blood lactate response to exercise. Because of the need for blood samples and trained personnel for lactate assessment, ratings of perceived exertion (RPE) have been used as an exercise prescription technique as RPE have been shown to accurately produce specific blood lactate concentrations. The lactate threshold (LT) is defined as the highest work load attained prior to blood lactate accumulation during exercise. Training at an RPE corresponding to a blood lactate concentration above the LT results in improvements in physiological variables associated with performance. Performance improvements have also been observed while ingesting carbohydrate before and during exercise. As little is known regarding the effects of carbohydrate supplementation on the blood lactate-RPE relationship, the present study will evaluate whether carbohydrate supplementation affects this relationship. We hypothesize that the blood lactate-RPE relationship will be altered with carbohydrate ingestion, thus affecting the use of RPE for producing a given blood lactate during exercise.