Muscle activity
AD muscle
Similar amplitudes for CES muscle activity between tablet tilt angles and among time intervals were found. Between tablet tilt angles, Intolo and Plangsiri found similar findings that there was no significant difference of CES muscle activity between 20-minute tablet use with and without a tilt angle in female office workers [The 30° tablet tilt angle induced a larger amplitude of the right UT muscle activity but not the left one compared to the 0° tablet tilt angle; moreover, UT did not differ over 40 minutes. Between tablet tilt angles, the current finding did not correspond with the study of Chiu et al. [Both tablet tilt angles and time spent did not affect the right AD muscle activity. This result was inconsistent with the study of Chiu et al. which found that AD muscle activity increased with increased tablet tilt angles [