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. 2019 May 23;19(10):2370. doi: 10.3390/s19102370

Figure 1.

Figure 1

Location of electrodes according to each method. (a) Cross section of the right forearm muscle and location of six targeted electrodes. (b) Location of six untargeted electrodes. BR: brachioradialis; ECRB: extensor carpi radialis brevis; ECRL: extensor carpi radialis longus; ECU: extensor carpi ulnaris, EDC: extensor digitorum communis; EDM: extensor digiti minimi; FCR: flexor carpi radialis; FCU: flexor carpi ulnaris; FDP: flexor digitorum profundus; FDS: flexor digitorum superficialis; FPL: flexor pollicis longus; PT: pronator teres. (c) Electrode placement with targeted method. Six forearm muscles were targeted in this study. The most prominent area of ECRL/B, which is 3 cm distal to the elbow joint, was the target area for the muscle. The upper third area between the lateral epicondyle and the midpoint of the wrist joint was the target site for EDC. Additionally, the midpoint between the lateral epicondyle and the ulnar styloid was targeted for ECU. Electrodes for FCR were located at the proximal one-third of the way between the tendon of FCR at the wrist and the medial supracondylar area of the humerus. The midforearm area between palmaris longus and FCU was the target area for FDS. Finally, FCU was targeted at the midline between the ulnar styloid process and the medial epicondyle [28]. (d) Electrode placement with untargeted method. Six surface electromyography (sEMG) channels were located equally around the circumference of the forearm.