Studies Using Magnetic Resonance Imaging (MRI) to Determine the Amount

Studies using magnetic resonance imaging (MRI) to determine the amount of muscle used during NMES have found which of the following?

A) Only motor units near the skin's surface are activated.
B) Motor units throughout the muscle are activated.
C) Only motor units directly under the electrodes are activated.
D) Motor units in the deep part of the muscle near bone are not activated.