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Table 2 Predictions of median trapezius muscle activity and shoulder, head, neck, and torso postures

From: Prediction of trapezius muscle activity and shoulder, head, neck, and torso postures during computer use: results of a field study

Median Task-based predictions Expanded model predictions1
  R 2 RMS Relative RMS R 2 RMS Relative RMS
Shoulder EMG (%MVC)       
Right Trapezius 0.06 3 19 0.48 2 14
Left Trapezius 0.03 3 18 0.55 3 14
Shoulder Posture (degrees)       
Right Abduction 0.01 10 14 0.58 7 10
Left Abduction 0.03 9 15 0.35 7 12
Right Flexion 0.01 14 20 0.22 13 18
Left Flexion 0.02 13 22 0.39 10 19
Right Internal Rotation 0.35 15 19 0.48 14 17
Left Internal Rotation 0.09 12 15 0.35 11 14
Head Posture (degrees)       
Tilt 0.00 4 13 0.24 4 13
Flexion 0.02 9 16 0.32 8 14
Neck Posture (degrees)       
Tilt 0.00 3 13 0.36 3 11
Flexion 0.10 9 13 0.47 7 11
Torso Posture (degrees)       
Tilt 0.00 3 14 0.44 3 11
Flexion 0.00 11 16 0.33 9 14
  1. 1R2, RMS, and Relative RMS are the average values from jackknifed calculations.
  2. Comparison of task-based and expanded model predictions based on R2 values, RMS errors, relative RMS errors.