Figure 4.

Experimental set-up

A, Experiment 1: the thin-film electrode was inserted in the abductor digiti minimi muscle and the subject was instructed to abduct the little finger at 10 and 15% of the maximal force. B, Experiment 2: electromyographic signals were recorded from the tibialis anterior muscle with two intramuscular thin-film structures and a grid of surface electrodes while the subject dorsiflexed the ankle exerting 10, 20 and 30% of the maximal force. C, Experiment 3: the subject lay supine and breathed quietly with the thin-film structure inserted into the genioglossus muscle.