Muscular activity and acceleration of box vibration in manual holding tasks : Effects of load and height of the load's center of gravity.

This study recruited 14 participants to examine the effects of load and height of load's center of gravity (COG) on muscular activities of 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 twelve conditions (four loads × three heights of the load's COG). The results showed that the muscular activities of brachioradialis, biceps brachii, and erector spinae significantly increased with load; however, they were not affected by the height of load's COG. In addition, box vibration acceleration increased with load, and decreased with the height of load's COG. The interaction effect of load and the height of load's COG on box vibration acceleration were also significant. This study recommends that the load magnitude should be decreased for the holding task that requires low vibration. PMID: 29553876 [PubMed - as supplied by publisher]
Source: International Journal of Occupational Safety and Ergonomics - Category: Occupational Health Tags: Int J Occup Saf Ergon Source Type: research