Since the muscle activity of upper trapezius on all of the percentiles are remarkably less than the Jonsson borderline, we can state that upper arm of the subjects were on lowest risk of MSDs compared to the other body parts (lower arm and shoulder).
We can consider the upper arm posture as the last considerations in determining the posture for doing the c-ring assembly.
We can consider the upper arm posture as the last considerations in determining the posture for doing the c-ring assembly.