Mixed-Method Precooling Enhances Self-Paced 20-km Cycling Time-Trial Performance When Apparent Temperature Is >46 °C but May Not Be a Priority in <46 °C.

IF 3.5 2区 医学 Q1 PHYSIOLOGY
Julian Andro P Ramos, Kagan J Ducker, Hugh Riddell, Olivier Girard, Grant J Landers, Carly J Brade
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引用次数: 0

Abstract

Purpose: Precooling (PreC) may only benefit performance when thermal strain experienced by an individual is sufficiently high. We explored the effect of mixed-method PreC on 20-km cycling time-trial (CTT) performance under 3 different apparent temperatures (AT).

Methods: On separate days, 12 trained or highly trained male cyclists/triathletes completed six 20-km CTTs in 3 different ATs: hot-dry (35 °C AT), moderately hot-humid (40 °C AT), and hot-humid (46 °C AT). All trials were preceded by 30 minutes of mixed-method PreC or no PreC (control [CON]).

Results: Faster 2.5-km-split completion times occurred in PreC compared with CON in 46 °C AT (P = .02), but not in 40 °C AT (P = .62) or 35 °C AT (P = .57). PreC did not affect rectal and body temperature during the 20-km CTT. Skin temperature was lower throughout the CTT in PreC compared with CON in 46 °C AT (P = .01), but not in 40 °C AT (P = 1.00) and 35 °C AT (P = 1.00). Heart rate had a greater rate of increase during the CTT for PreC compared with CON in 46 °C AT (P = .01), but not in 40 °C AT (P = .57) and 35 °C AT (P = 1.00). Ratings of perceived exertion (P < .001) and thermal comfort (P = .04) were lower for PreC compared with CON in 46 °C AT only, while thermal sensation was not different between PreC and CON.

Conclusion: Mixed-method PreC should be applied prior to 20-km CTTs conducted in hot-humid conditions (≥46 °C AT). Alternatively, mixed-method PreC may be a priority in moderately hot-humid (∼40 °C AT) conditions but should not be in hot-dry (∼35 °C AT) conditions for 20-km CTT.

当表观温度>46 °C时,混合方法预冷可提高自定步速的20公里自行车计时赛成绩,但在<46 °C时,预冷可能不是重点。
目的:预冷(Precooling,PreC)只有在个体承受的热应变足够大时才可能对运动成绩有利。我们探讨了在 3 种不同表观温度(AT)条件下,混合方法预冷对 20 公里自行车计时赛(CTT)成绩的影响:在不同的日子里,12 名受过训练或训练有素的男性自行车运动员/铁人三项运动员在 3 种不同的表观温度下完成了 6 次 20 公里的 CTT:干热(35 °C)、中度湿热(40 °C)和湿热(46 °C)。所有试验前都进行了 30 分钟的混合方法预习或无预习(对照组 [CON]):结果:与对照组相比,在 46 °C AT 条件下,PreC 完成 2.5 公里劈叉的时间更快(P = 0.02),但在 40 °C AT 条件下(P = 0.62)或 35 °C AT 条件下(P = 0.57)则不然。在 20 公里 CTT 中,PreC 不影响直肠和体温。在整个 CTT 中,与 CON 相比,PreC 在 46 °C AT 中的皮肤温度较低(P = .01),但在 40 °C AT(P = 1.00)和 35 °C AT(P = 1.00)中则不然。在 46 °C AT 中,与 CON 相比,PreC 在 CTT 期间的心率上升率更大(P = .01),但在 40 °C AT(P = .57)和 35 °C AT(P = 1.00)中则不然。仅在 46 °C AT 中,PreC 与 CON 相比,PreC 的体力感觉评分(P < .001)和热舒适度评分(P = .04)更低,而 PreC 与 CON 的热感觉评分没有差异:结论:在湿热条件下(≥46 ° C AT)进行 20 公里 CTT 之前,应采用混合方法进行预控。另外,在中度湿热(∼40 °C)条件下,也可优先采用混合方法进行预热,但在干热(∼35 °C)条件下,则不应采用混合方法进行 20 公里 CTT。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
5.80
自引率
12.10%
发文量
199
审稿时长
6-12 weeks
期刊介绍: The International Journal of Sports Physiology and Performance (IJSPP) focuses on sport physiology and performance and is dedicated to advancing the knowledge of sport and exercise physiologists, sport-performance researchers, and other sport scientists. The journal publishes authoritative peer-reviewed research in sport physiology and related disciplines, with an emphasis on work having direct practical applications in enhancing sport performance in sport physiology and related disciplines. IJSPP publishes 10 issues per year: January, February, March, April, May, July, August, September, October, and November.
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