英文摘要
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This study aims to investigate whether the use of pneumatic impact wrenches and tire dollies, as well as different operating positions (standing and kneeling), affect the heart rate, percentage of decline in grip strength, rating of perceived exertion (RPE), subjective rankings for work ease, and the effects of subjective rankings for work practicality, in heavy tire maintenance personnel. A total of eight subjects participated in the experiment. The results show that, for maintenance personnel who used large pneumatic wrenches, both heart rate and percentage of decline in average grip strength were much lower than those working without the use of assistive devices. There were no significant physiological cost savings associated with the use of tire dollies during large tire handling operations. As for different operating positions, the kneeling position together with the use of pneumatic wrenches was shown to be better. The subjective rankings for work ease, as well as the effects of the subjective rankings for work practicality, show that the use of pneumatic wrenches with tire dollies, combined with a kneeling position, provided optimal conditions. Yet since the kneeling position may lead to knee cartilage and meniscus injuries, it is recommended that heavy tire maintenance workers switch to a standing work posture.
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