Figure 1From: Prediction of trapezius muscle activity and shoulder, head, neck, and torso postures during computer use: results of a field study Percent increase in participants that would be required in order for the expanded model predictions to have the same power to detect differences as the direct measurements, as a function of R 2 , for each median and range of amplitude of trapezius muscle activity and each median and range of motion of shoulder, head, neck, and torso posture. Back to article page