Writing is an everyday activity that is typically performed with the dominant hand7). Left-handers have more difficulties writing than right-handers. While right-handers place the hand below the area in which they are writing, left-handers invert the writing posture by placing the hand above the area in which they are writing8). When writing letters, they place the right side of the paper to the left of the very middle line of the body. Therefore, when left-handers write letters, they sit to the left side of the desk so that their arm movement is not restricted. In addition, easing tension by ensuring that the wrist or shoulder does not excessively flex when writing letters would prevent any unnatural change of posture9).
The purpose of this study was to investigate if there is any difference in muscle activation (%MVIC) according to the dominant side in writing. Through this research, the study is intended to prevent musculoskeletal disorders in left-handers by identifying the risks for musculoskeletal disorders and restricted work performance for left-handers, and to further suggest the need for work performance enhancement through an ergonomics approach.