The effects of swilling an L(-)-menthol solution during exercise in the heat
The effects of swilling an L(-)-menthol solution during exercise in the heat
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DOI：
10.1007/s00421-009-1180-9
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发表时间：
2010-05-01
影响因子：
3
通讯作者：
Jones, David A.
中科院分区：
文献类型：
--
作者：
Mundel, Toby;Jones, David A.
我们之前已经证明，与对照流体（19摄氏度）相比，在高温下运动期间提供冷流体（4摄氏度）增加了流体摄入量并提高了运动能力。本研究调查了这些积极的影响是否可以简单地复制与冷却剂，薄荷醇。9只健康、未驯化的雄性动物（25 +/- 7岁;（V）超过dotO（2 max）：54 +/- 5 ml kg（-1）min（-1）），在34 ℃下以峰值有氧功率输出的65%循环至耗尽，吞咽25 ml L（-）-薄荷醇或（0.01%）或橙味安慰剂溶液，同时可自由饮水;所有液体均保持在19 ℃。9名受试者中有8名在使用薄荷醇时骑自行车的时间更长，这导致耐力提高了9 +/- 12%。在两种情况下，直肠温度在运动过程中上升了1.7摄氏度，而皮肤温度基本保持不变。薄荷脑刺激导致过度通气8 +/- 10 L min-1，并使感觉劳累的中枢（心肺）评分降低15 +/-14%。在心率、摄氧量或二氧化碳产生量、葡萄糖或乳酸盐的血液浓度、出汗率或摄入的水量方面，没有观察到试验之间的差异。我们的结论是，在运动过程中的口咽温度的感觉在热的变化显着影响耐力，通风和（中央）的努力感。
We have previously demonstrated that provision of a cold fluid (4 degrees C) during exercise in the heat increases fluid intake and improves exercise capacity when compared to a control fluid (19 degrees C). The present study investigated whether these positive effects could simply be replicated with a cooling agent, menthol. Nine healthy, non-acclimatised males (25 +/- 7 years; (V) over dotO(2max): 54 +/- 5 ml kg(-1) min(-1)) cycled to exhaustion at 65% of their peak aerobic power output at 34 degrees C, swilling 25 ml of either an L(-)-menthol (0.01%) or orange-flavoured placebo solution every 10 min, whilst water was available ad libitum; all fluids were kept at 19 degrees C. Eight out of nine subjects cycled for longer whilst swilling with menthol and this resulted in a 9 +/- 12% improvement in endurance capacity. Rectal temperatures rose by 1.7 degrees C during exercise with the same time course in both conditions, whilst skin temperature remained largely unchanged. Swilling with menthol resulted in hyperventilation by 8 +/- 10 L min-1 and reduced central (cardiopulmonary) ratings of perceived exertion by 15 +/- 14%. No differences between trials were observed for heart rate, oxygen uptake or carbon dioxide production, blood concentrations of glucose or lactate, sweat rate or volume of water ingested. We conclude that a change in the sensation of oropharyngeal temperature during exercise in the heat significantly affects endurance capacity, ventilation and the (central) sense of effort.