Performance and physiological effects of different descending strategies for cross-country mountain biking

IF 2.4 3区医学 Q2 SPORT SCIENCES

European Journal of Sport Science Pub Date : 2017-03-16 DOI:10.1080/17461391.2016.1237550

Matthew C Miller, P. W. Macdermid, P. Fink, S. Stannard

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引用次数: 12

Abstract

Abstract This study investigated the performance-related feasibility and physiological benefits of purposefully eliminating propulsive work while descending in mountain biking and compared values to those measured during road descending. Participants cycled uphill on a road at race pace before descending over three conditions (off-road pedalling; off-road coasting; road coasting). Relatively low power output during off-road pedalling was associated with a greater oxygen uptake (p < .01) when compared with off-road coasting despite no difference in vibration exposure (p > .05). Importantly, pedalling did not invoke a performance benefit (p > .05) on the descent used in this study. Significantly greater heart rate and oxygen uptake (both p < .01) were observed between road and off-road descending, likely caused by the increase in terrain-induced vibrations (p < .01) experienced between the bicycle and rider. Results indicate that reducing propulsive work during descending can improve recovery without being disadvantageous to performance. Similarly, the vibrations experienced during road descending are relatively low, and further reduce oxygen cost. In an effort to increase efficiency, it is recommended that mountain bike athletes focus on skills to increase descending speed without the addition of pedalling, and that equipment be used to decrease vibrations nearer to those seen on the road.

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越野山地自行车不同下坡策略的性能及生理效应

摘要:本研究探讨了山地自行车在下降过程中有目的地消除推进功的可行性和生理效益，并将其与公路下降过程中的测量值进行了比较。参与者在赛道上以比赛速度上坡，然后在三种情况下下坡(越野蹬车;越野滑行;道路滑行)。越野蹬车时相对较低的功率输出与较高的摄氧量有关(p . 0.05)。重要的是，在本研究中使用的下坡时，踩踏板并没有带来性能上的好处(p > 0.05)。在公路骑行和越野骑行中，心率和摄氧量显著增加(p < 0.01)，这可能是由于自行车和骑行者之间经历的地形引起的振动增加(p < 0.01)。结果表明，在不影响性能的前提下，减少下降过程中的推进功可以提高采收率。同样，在道路下降过程中所经历的振动也相对较低，从而进一步降低了氧气成本。为了提高效率，建议山地车运动员专注于提高下降速度的技巧，而不是额外的踏板，并且使用设备来减少更接近道路上看到的振动。

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

European Journal of Sport Science 医学-运动科学

CiteScore

6.60

自引率

3.10%

发文量

153

审稿时长

6-12 weeks

期刊介绍： The European Journal of Sport Science (EJSS) is the official Medline- and Thomson Reuters-listed journal of the European College of Sport Science. The editorial policy of the Journal pursues the multi-disciplinary aims of the College: to promote the highest standards of scientific study and scholarship in respect of the following fields: (a) Applied Sport Sciences; (b) Biomechanics and Motor Control; c) Physiology and Nutrition; (d) Psychology, Social Sciences and Humanities and (e) Sports and Exercise Medicine and Health.