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RMS of the normalized activation level of Bi and Tr in the right (rBi, rTr) and left (lBi, lTr) arms during lifting, holding, and lowering, and average assistive torque (Ta) while holding a 2 or 7 kg load. (nsp > 0.05, *p < 0.05, **p < 0.01, and ***p < 0.001).
