Oxygen consumption during walking and running under fractional weight bearing conditions.
Oxygen consumption during walking and running under fractional weight bearing conditions.
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DOI：
10.3357/asem.2693.2010
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发表时间：
2010-06
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影响因子：
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通讯作者：
H. Ruckstuhl;T. Schlabs;Armando Rosales-velderrain;A. Hargens
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文献类型：
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作者：
H. Ruckstuhl;T. Schlabs;Armando Rosales-velderrain;A. Hargens
引言在不同速度水平下减轻体重负荷期间氧气消耗变化的知识是重要的，特别是在可能失去有氧健身的宇航员以及临床患者（例如，在步行速度下的肥胖个体中或在跑步速度下的受伤运动员中）。因此，本研究的目的是分析无负荷步行和跑步时的耗氧量。方法氧耗量（Vo 2）、心率（HR）和博格自感觉劳累评分在3种体重（BW）条件下，对10名健康年轻女性和男性志愿者的（博格RPE）进行定量（100%、66%和33% BW）和4种跑步机速度（0.4 m x s（-1）慢速步行，1.3 m x s（-1）舒适步行，2.2 m x s（-1）慢速跑步，3.1 m x s（-1）适度快速跑步）。卸载是在一个腰高的腔室中实现的，该腔室具有增加的压力，称为下体正压（LBPP）。结果：在无负荷步行和跑步过程中，所有参数（Vo 2、HR和博格RPE）均降低。有趣的是，我们的研究结果证实了每个BW条件下每个参数和跑步机速度之间的特定线性关系，其中在较高的卸载水平下具有较小的倾角（例如，对于Vo 2，倾斜角从100%BW时的11.9降低至33%BW时的4.4）。讨论氧消耗量，心率，和博格等级的感觉消耗减少在无负荷运动与一个相对较大的下降在更高的跑步机速度。也就是说，跑步机在空载条件下的速度越高，锻炼就越“容易”。
INTRODUCTION Knowledge of changes in oxygen consumption during reduced body weight loading at different speed levels is important, in particular in astronauts who may lose aerobic fitness as well as in clinical patients (e.g., in obese individuals at walking speeds or in injured athletes at running speeds). Therefore, the aim of this study was to analyze oxygen consumption during unloaded walking and running. METHODS Oxygen consumption (Vo2), heart rate (HR), and Borg rating of perceived exertion (Borg RPE) were quantified in 10 healthy young female and male volunteers at 3 body weight (BW) conditions (100%, 66%, and 33% BW) and 4 treadmill speeds (slow walking at 0.4 m x s(-1), comfortable walking at 1.3 m x s(-1), slow running at 2.2 m x s(-1), and moderately fast running at 3.1 m x s(-1)). Unloading was achieved in a waist-high chamber with increased pressure called Lower Body Positive Pressure (LBPP). RESULTS All parameters (Vo2, HR, and Borg RPE) decreased during unloaded walking and running. Interestingly, our findings confirm a specific linear relationship between each parameter and treadmill speed for each BW condition with smaller slope angles at higher levels of unloading (e.g., for Vo2, the slope angle decreased from 11.9 at 100% BW to 4.4 at 33% BW). DISCUSSION Oxygen consumption, heart rate, and Borg rating of perceived exertion are reduced during unloaded exercise with a relatively greater decline at higher treadmill speeds. That is, the higher the treadmill's speed in unloaded conditions, the relatively "easier" it is to exercise.