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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Effect of Ambient Oxygen Content Safety Shoe Type and Lifting Frequency on Subject’s MAWL and Physiological Responses
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Effect of Ambient Oxygen Content Safety Shoe Type and Lifting Frequency on Subject’s MAWL and Physiological Responses

机译：环境氧含量安全靴类型和举起频率对受试者的MAWL和生理反应的影响

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Objective: The purpose of this study was to evaluate the lifting capabilities of individuals in hypoxia when they wear different types of safety shoes and to investigate the behavior of the physiological responses induced by the lifting process associated with those variables. Methods: An experimental design was used, based on two sessions. The first was training and acclimatization session, then an experimental lifting phase. A total of ten male students of King Saud University were recruited in the study. A four-way repeated measures design, with four independent variables and six dependent variables, was used in this research. The independent variables that were studied in the experimental lifting phase were: ambient oxygen content (15%, 18%, and 21%), safety shoes type (light-duty, medium-duty, and heavy-duty), lifting frequency (1 and 4 lifts/min), and replication (first and second trials). The dependent variables were also: maximum acceptable weights lifting using the psychophysical technique, heart rate (HR), electromyography (EMG) of (biceps brachii, trapezius, anterior deltoid, and erector spinae), safety shoes discomfort rating, rating of perceived exertion, and ambient oxygen discomfort rating. Results: The maximum acceptable weights lifting that were selected by participants at lower levels of the independent variables (ambient oxygen content 21%, lifting frequency 1 lift/min, and first replication) were significantly higher than at high levels of the independent variables (ambient oxygen content 15%, lifting frequency 4 lift/min, and second replication). Several interaction effects were also significant. Conclusions: It provides evidence that the ambient oxygen content increases the intensity of workload in lifting tasks. It showed that oxygen content affects the psychophysical selection of maximum acceptable weights lifting and the physiological responses represented in muscular activities and heart rate. It suggests that ambient oxygen content must be considered along with the type of safety shoes worn when the lifting task at altitudes occurs.
机译：目的：本研究的目的是评估缺氧个体穿着不同类型的安全鞋时的举升能力，并研究与这些变量相关的举升过程引起的生理反应行为。方法：基于两个阶段使用实验设计。首先是培训和适应课程，然后是实验性提升阶段。该研究共招募了十名沙特国王大学的男学生。在这项研究中使用了具有四个自变量和六个因变量的四向重复测量设计。在实验起重阶段研究的自变量为：环境氧气含量（15％，18％和21％），安全鞋类型（轻型，中型和重型），起重频率（1和4次提升/分钟）和复制（第一次和第二次试验）。因变量还包括：使用心理物理技术可以承受的最大举重，心率（HR），肱二头肌，斜方肌，前三角肌和竖脊肌的肌电图（EMG），安全鞋不适等级，感知劳累等级，和环境氧气不适等级。结果：参与者在较低的自变量水平（环境氧气含量21％，提升频率1升/分钟和首次复制）下选择的最大可接受举重明显高于在自变量较高的水平（环境中）氧气含量15％，提升频率4提升/分钟，第二次复制）。几种相互作用的影响也很明显。结论：它提供了证据，表明环境氧含量增加了起重任务中的工作强度。结果表明，氧含量会影响最大可接受举重的心理生理选择以及以肌肉活动和心率表示的生理反应。这表明在高空举升任务发生时，必须将环境氧气含量与安全鞋的类型一起考虑。

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