Abstract
Abstract: According to the frequent use of mobile devices, risk of repetitive strain injury for the finger joints wasincreasing recently. The purpose of this study was to investigate the difference of muscular endurance limit of thethumb between adults and children. A total of thirty subjects (15 adults: 41.0± 7.9 years and 15 children: 9.5± 2.7years) was recruited for this experiment. Maximum voluntary contraction (MVC) of the thumb was measured for100 trials for each subject by using a push-pull gauge. From the maximum peak value obtained, three main factors(MVC, endurance limit, and fatigue index) were defined to quantify fatigue characteristics of the thumb flexor muscle.The experimental results showed that the mean of MVC, endurance limit, and fatigue index of the children wereapproximately 50% compared to the adults (p < 0.001). From the results of Pearson correlation test, the endurancelimit was highly correlated with weight, age, hand length rather than height. Based on this study, children are morevulnerable to repetitive task using the thumb such as text/SNS messaging, gaming, and scrolling.Key words: repetitive strain injury, thumb, muscle fatigue, muscular endurance limit, mobile device
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
