Fig. 4. APDF graphs of the CES and UT according to time. Curve 1: 0–1 minute; Curve 2: 5–6 minutes; Curve 3: 10–11 minutes; and Curve 4: 15–16 minutes. The solid line at ‘y = 10’ means 10% APDF. (A) Without PCF and (B) with PCF. APDF, amplitude probability distribution function; %RVC, percentage of reference voluntary contraction; CES, cervical erector spinae; UT, upper trapezius; PCF, posture correction feedback.

Phys. Ther. Korea 2023;30:221~229 https://doi.org/10.12674/ptk.2023.30.3.221

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