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. 2015 May 21;119(3):223–231. doi: 10.1152/japplphysiol.01044.2014

Fig. 1.

Fig. 1.

Schematic representation of the interpolated triplet technique, in which voluntary activation is quantified by comparing the torque increment associated with the electrical stimulus during contraction [i.e., evoked torque during contraction; (ab) in the equation] to the torque generated by an identical electrical stimulus delivered when the muscle is at rest (i.e., evoked torque at rest; c in the equation).