Abstract This study investigated muscle activity and discomfort of the upper limb as a function of weight distributions in a handle of a cordless stick-type vacuum cleaner. Seventeen female college students with the experience of vacuum cleaner-use were recruited for testing. Handle mock-ups with five different centers of mass (top front, top rear, bottom front, bottom rear, and center) were manufactured, and muscle activity (electromyography) and discomfort (Borg CR10) were measured during vacuuming with the mock-ups. The results showed that the %MVC of the Extensor Carpi Ulnaris (p = 0.0155) and Upper Trapezius (p = 0.0228) decreased when the center of mass moved from the bottom to top of the mock-up. However, the %MVC of the Biceps Brachii had reverse propensities under the same conditions (p = 0.0151). Meanwhile, the discomfort on the hand (p = 0.0080), upper arm (p = 0.0160), shoulder (p = 0.0112), and neck (p = 0.0226) decreased when the center of mass moved from the bottom to top of the mock-up.

中文翻译：

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无线棒式吸尘器手柄重量分布的影响：上肢的肌肉活动和主观不适

摘要 本研究调查了作为无绳棒式真空吸尘器手柄重量分布函数的上肢肌肉活动和不适。招募了17名有吸尘器使用经验的女大学生进行测试。制造了具有五个不同重心（顶部前部、顶部后部、底部前部、底部后部和中心）的手柄模型，并在使用模型进行真空吸尘过程中测量了肌肉活动（肌电图）和不适感（Borg CR10） . 结果表明，当重心从模型底部移动到顶部时，尺骨腕伸肌 (p = 0.0155) 和上斜方肌 (p = 0.0228) 的 %MVC 降低。然而，在相同条件下，肱二头肌的 %MVC 具有反向倾向（p = 0.0151）。同时，