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. Author manuscript; available in PMC: 2019 May 1.
Published in final edited form as: Muscle Nerve. 2017 Dec 11;57(5):784–791. doi: 10.1002/mus.26026

Figure 1. Usual setups used to measure quadriceps twitch force elicited by magnetic stimulation of the femoral nerve.

Figure 1

Upper panel, the leg dangles at the edge of a specially designed gurney. Lower panel, the leg rests on a right-angle trapezoid support. With both setups, a “branding iron” figure-of-eight coil is placed over the femoral triangle. When activated, the coil generates a broad magnetic field that causes depolarization of the femoral nerve eliciting quadriceps muscle contractions. The resulting force is transmitted to a strain amplifier/signal conditioner (green box) connected to an ankle strap (blue) using an inextensible cable.