Chronic Effects of Wide-pulse Neuromuscular Electrostimulation on Neuromuscular and Functional Properties in Healthy Subjects

The WP NMES program consists of electrical stimulation trains of 1000 symmetrical biphasic pulses (1 ms, 100 Hz). The duration of a train is of 10 s and the rest between trains is of 30 s. A WP NMES session includes 30 evoked contractions. The stimulation intensity is monitored online and adjusted to the highest tolerable by the subjects.During the stimulation, subjects are seated with the knee joint fixed a 60° angle. Three self-adhesive electrodes are placed over the right thigh. The positive electrodes, measuring 25 cm² (5 x 5 cm), are placed as close as possible to the motor point of the vastus lateralis and vastus medialis muscles. The negative electrode, measuring 50 cm² (10 x 5 cm), is placed 5-7 cm below the inguinal ligament. Electrical stimulations are delivered by a stimulator BioStim (Mazet Santé).

"The CONV NMES program consists of electrical stimulation trains of 500 symmetrical biphasic pulses (0.2 ms, 50 Hz). The duration of a train is of 10 s and the rest between trains is of 30 s (duty cycle: 1/3). A WP NMES session includes 30 evoked contractions. The stimulation intensity is monitored online and adjusted to the highest tolerable by the subjects.~During the stimulation, subjects are seated with the knee joint fixed a 60° angle. Three self-adhesive electrodes are placed over the right thigh. The positive electrodes, measuring 25 cm² (5 x 5 cm), are placed as close as possible to the motor point of the vastus lateralis and vastus medialis muscles. The negative electrode, measuring 50 cm² (10 x 5 cm), is placed 5-7 cm below the inguinal ligament. Electrical stimulations are delivered by a stimulator BioStim (Mazet Santé)."

Control (CONT) modality is used as a reference and is representative of a sedentary behaviour regularly observed in our populations.