The effect of tablet tilt angle on neck and shoulder posture, muscle activity, and discomfort.
ANTERIOR, HEART
IQR = Interquartile range, EMG = Electromyography, CES = Cervical Erector Spinae, UT = Upper Trapezius, AD = Anterior Deltoid, VAS = Visual Analogue Scale, HRV = Heart Rate Variability, LF/HF = Ratio of low frequency and high frequency, and* P <0.05.