An electromyographic investigation of asymmetric lifting and moving of a load: II. Effects of load lift from knuckle to target shelves

✍ Scribed by Biman Das; Godfrey Mabaleka

• Book ID: 102245101
• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 98 KB
• Volume: 19
• Category: Article
• ISSN: 1090-8471
• DOI: 10.1002/hfm.20162

✦ Synopsis

Abstract

The range of normalized electromyography (EMG) values when lifting and moving a 5.84 kg box was between 0.08 and 0.63. The right iliocostalis and the left erector spinae showed decreased muscle activity with increasing asymmetry. The right erector spinae and the left and the right external obliques showed significant increases in muscle activity at 90° asymmetry. The left and the right iliocostalis, the left erector spinae, and the right external oblique showed significant reductions in muscle activity for the sternum height when compared to the knuckle height. The right erector spinae exhibited a significant increase at reach height when compared to the knuckle height. The muscle activity for the knuckle lift was significantly lower than the floor lift. The average decrease in muscle activity was approximately 68%. Consequently, asymmetric lifting and moving tasks should be performed from a knuckle height to sternum height. © 2009 Wiley Periodicals, Inc.