Abstract
This study recruited 14 participants to examine the effects of load and height of the load's center of gravity (COG) on muscular activities of the brachioradialis, biceps brachii and erector spinae, and on box vibration acceleration (g) in manual holding tasks. Each participant was asked to hold a box in 12 conditions (4 loads × 3 heights of the load's COG). The results showed that muscular activities of the brachioradialis, biceps brachii and erector spinae significantly increased with load; however, they were not affected by the height of the load's COG. In addition, box vibration acceleration increased with load, and decreased with the height of the load's COG. The interaction effect of load and height of the load's COG on box vibration acceleration was also significant. This study recommends that the load magnitude should be decreased for the holding task that requires low vibration.
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