Effects of Mouse Back Shape on Grip Comfort: An Ergonomic Study

The shape of a computer mouse’s back, specifically its curvature or arch height, is a key factor influencing user comfort during prolonged use. However, this aspect of mouse design has received relatively little attention in ergonomic research. This study examines the impact of shifting the highest point of the mouse back on grip comfort and muscle activation. Five mouse models were evaluated, including a baseline model and four modified designs with varying peak positions (higher, lower, forward, and backward). Subjective comfort was assessed using Likert scale ratings, and muscle activity was measured using electromyography (iEMG) during controlled clicking tasks. One-way ANOVA was used to analyze subjective ratings, while the Kruskal-Wallis H test was employed for the iEMG data. Results revealed significant differences in subjective comfort, with the baseline and forward-shifted models rated higher. However, no significant differences in muscle activation were observed. These findings suggest that peak position influences perceived comfort but does not significantly affect short-term muscle activity. The results provide valuable insights for optimizing ergonomic mouse design.