Computer key switch force-displacement characteristics and short-term effects on localized fatigue

This study investigates the effects of key switch design parameters on shor t-term localized muscle fatigue in the forearm and hand. An experimental ap paratus was utilized for simulating and controlling key switch make force a nd travel using leaf spring mechanisms, and provided direct measurement of applied key strike force using strain gauge load cells. Repetitive key tapp ing was performed as fast as possible using the dominant index finger for 5 00 s per condition (8.3 min) and a work-rest schedule consisting of 15 s of key tapping alternating with 10 s of rest. One combination of two make for ce levels (0.31 and 0.71 N) and two over travel distances (0.5 and 4.5 mm) was presented randomly on four different days. Nine subjects participated. Localized muscle fatigue in the hand and forearm was assessed subjectively using a 10 cm visual analogue scale, and objectively using surface electrom yography (EMG). Average peak key strike force exerted was 0.35 N less for t he smaller make force and 0.59 N less for the longer over travel distance. Fatigue occurred in all cases but no significant differences were observed between key switch parameters based on RMS EMG. Subjective reports of local ized fatigue after 500 s were less when the key switch make force was less; however, a corresponding over travel effect was not observed despite the g reatly reduced key strike force for the longer over travel distance. This d iscrepancy may be explained by the greater finger movement that was observe d with increased over travel. Although there was no apparent improvement in short-term discomfort from fatigue when over travel was increased, this st udy did not consider the potential long-term health benefits from reduced k ey strike force.