Mechanisms of reduction in exercise performance at an excessive increase in body temperature and countermeasures

体温过度升高导致运动能力下降的机制及对策

• 批准号: 16300208
• 负责人: KONDO Narihiko
• 金额: $ 9.79万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-16300208/
• 关键词: thermoregulation; exercise performance; excessive body temperature; exercise training; heat acclimation; 体温; 静的掌握運動; 最大随意筋収縮; 換気量; 呼吸数; 体力; 最大酸素摂取量; 静的運動; 動的運動; 発汗; 皮膚血流

An excessive increase in body temperature during exercise impairs exercise performance. One reason for the impaired performance might be the high body temperature itself. Alternatively, the high body temperature might affect the regulation of the pulmonary, cardiovascular, and nervous systems. Understanding these mechanisms could lead to ways to prevent reduction in exercise performance at high body temperatures. This study investigated the mechanisms that reduce exercise performance when an excessive increase in body temperature occurs, and possible countermeasures.It has been reported that an excessive increase in body temperature influences brain activity directly. Increased skin blood flow and the dehydration associated with sweating induces cardiovascular drift during exercise. These negative factors cause a decline in exercise performance. In addition, this study identified other negative factors. First, the increase in muscle sympathetic nerve activity with a rise in body temperature may induce a reduction in blood flow to the exercised muscle. In addition, the facilitation of ventilation with a rise in body temperature causes a reduction in cerebral blood flow, which impairs exercise performance. However, there is a positive relationship between the facilitation of ventilation with increased body temperature and aerobic capacity, suggesting that exercise training would relieve this factor. Moreover, we have found that the degree of the reduction in exercise performance at high body temperatures is influenced by exercise experience in daily life. Therefore, ways oprevent the reduction in exercise performance with an excessive increase in body temperature include inhibiting the effect of rising body temperature on pulmonary, cardiovascular, thermoregulatory and nerve system and using exercise training.

运动时体温过高会影响运动表现。表现受损的一个原因可能是体温过高。另外，高体温可能会影响肺、心血管和神经系统的调节。了解这些机制可以找到防止在高体温下运动表现下降的方法。本研究旨在探讨体温过度升高导致运动表现下降的机制，以及可能的对策。据报道，体温的过度升高会直接影响大脑活动。在运动过程中，皮肤血流量增加和与出汗相关的脱水会引起心血管漂移。这些负面因素会导致运动表现下降。此外，本研究还发现了其他负面因素。首先，随着体温升高，肌肉交感神经活动的增加可能会导致运动肌肉的血流量减少。此外，体温升高促进通气会导致脑血流量减少，从而影响运动表现。然而，通气便利性与体温升高和有氧能力之间存在正相关关系，表明运动训练可以缓解这一因素。此外，我们发现在高体温下运动表现的降低程度受日常生活中的运动经历的影响。因此，通过抑制体温升高对肺系统、心血管系统、体温调节系统和神经系统的影响，以及进行运动训练，可以防止体温过高导致运动成绩下降。

项目成果

運動と血圧

运动和血压

• 发表时间: 2005
• 期刊: 体育の科学 55
• 作者: Ichnose;M,.Saito M,.Kondo;N.;Nishiyasu;T.;Saito Mitsuru;斉藤 満
• 通讯作者: 斉藤 満

Effects of menstrual cycle and physical training on heat loss responses during dynamic exercise at moderate intensity in a temperate environment

• DOI: 10.1152/ajpregu.00547.2004
• 发表时间: 2005-05-01
• 期刊: AMERICAN JOURNAL OF PHYSIOLOGY-REGULATORY INTEGRATIVE AND COMPARATIVE PHYSIOLOGY
• 影响因子: 2.8
• 作者: Kuwahara, T;Inoue, Y;Kondo, N
• 通讯作者: Kondo, N