峰值摄氧量与坡度有关:从训练有素的男性跑步者的地面反作用力和肌肉吸氧量中获得的启示。

IF 4.1 2区 医学 Q1 SPORT SCIENCES
Marcel Lemire, Frédéric Meyer, Rosalie Triguera, Fabrice Favret, Grégoire P Millet, Stéphane P Dufour
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引用次数: 0

摘要

研究背景本研究旨在探讨跑步机坡度对地面反作用力和局部肌肉含氧量的影响,它们是分级最大增量跑测试中峰值摄氧量的潜在限制因素。13 名训练有素的男性跑步者在坡度分别为-15%、-7.5%、0%、7.5% 和 15%的跑步机上完成了五次最大增量跑步测试,同时心肺功能和局部肌肉氧合反应以及地面反作用力被持续记录。每次测试前后都测量了血液乳酸浓度和等长膝关节伸肌扭矩:结果:与所有其他条件相比,坡度为-15%时的峰值摄氧量较低(低-10%至-17%,p 结论:在坡度为-15%时,峰值摄氧量与坡度为-15%时相似:在坡度为-7.5%的下坡跑中,可以达到相似的峰值摄氧量。在更大的下坡坡度(即-15%)下,即使是熟悉下坡跑的受试者也会出现更大的肌肉负功和有限的局部肌肉脱氧,这可能会阻碍达到与其他条件相似的峰值摄氧量:要点:训练有素的男性跑步者可以在中等负坡度下达到类似水平的跑步VO2峰值,但不能在严重负坡度下达到该峰值。负外部机械功随着负斜率的增加而增加。在最大强度下,陡峭负斜坡时侧阔肌含氧量更高。尽管血乳酸较低,但最大水平跑和上坡跑后膝关节伸肌等长肌肉扭矩仍会保持不变,但下坡跑后则会降低。随着负斜率的增加,最大努力时的 V̇O2 逐渐减少,这可能与下肢负外部功(即偏心肌肉动作)增加的代谢后果有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Peak Oxygen Uptake is Slope Dependent: Insights from Ground Reaction Forces and Muscle Oxygenation in Trained Male Runners.

Background: The aim of this study is to explore the effect of treadmill slope on ground reaction forces and local muscle oxygenation as putative limiting factors of peak oxygen uptake in graded maximal incremental running tests. Thirteen trained male runners completed five maximal incremental running tests on treadmill at - 15%, - 7.5%, 0%, 7.5% and 15% slopes while cardiorespiratory and local muscle oxygenation responses as well as ground reaction forces were continuously recorded. Blood lactate concentration and isometric knee extensor torque were measured before and after each test.

Results: Peak oxygen uptake was lower at - 15% slope compared to all other conditions (from - 10 to - 17% lower, p < 0.001), with no difference between - 7.5 and + 15% slope. Maximal heart rate and ventilation values were reached in all conditions. The negative external mechanical work increased from steep uphill to steep downhill slopes (from 6 to 92% of total external work) but was not correlated with the peak oxygen uptake reduction. Local muscle oxygenation remained higher in - 15% slope compared to level running (p = 0.003).

Conclusions: Similar peak oxygen uptake can be reached in downhill running up to - 7.5% slope. At more severe downhill slopes (i.e., - 15%), greater negative muscle work and limited local muscle deoxygenation occurred, even in subjects familiarized to downhill running, presumably preventing the achievement of similar to other condition's peak oxygen uptake.

Key points: Trained male runners can reach like level running V̇O2peak at moderate but not at severe negative slope. Negative external mechanical work increases with increasing negative slope. At maximal intensity Vastus Lateralis muscle oxygenation is higher in steep negative slope. Knee extensor isometric muscle torque is preserved after maximal level and uphill running, but reduced after downhill running, despite lower blood lactate. Progressive reduction of V̇O2 at maximal effort with increasing negative slope might be related to the metabolic consequences of increased lower limb negative external work (i.e., eccentric muscle actions).

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来源期刊
Sports Medicine - Open
Sports Medicine - Open SPORT SCIENCES-
CiteScore
7.00
自引率
4.30%
发文量
142
审稿时长
13 weeks
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