79% less activity in the muscle that lifts your arm forward2
What the study found
With the centred rollerbar, activity in selected shoulder and forearm muscles was lower than with a regular mouse, and participants felt less strain in the hand and arm.
2 Kumar R, Kumar S. A comparison of muscular activity involved in the use of two different types of computer mouse. International Journal of Occupational Safety and Ergonomics, 2008; 14(3): 305–311. Randomised crossover laboratory study, 15 participants, Luleå University of Technology and University of North Texas; mean normalised anterior-deltoid EMG 79% lower with a centred rollerbar than with a conventional mouse during short pointing and dragging tasks. Perceived hand and arm strain was also lower.





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