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Mean values of normalized lower trapezius electromyographic (EMG) activity across different exercises at each intensity. Note that there was no difference in muscle activity across the different intensities for the lawn-mower exercise, but there were differences between 3% and 5% body weight (BW) and between 3% and 7% BW for the robbery exercise (P < .05). Abbreviations: MVIC, maximum voluntary isometric contraction; RMS, root mean square.
