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. 2020 Feb 28;15(2):e0229707. doi: 10.1371/journal.pone.0229707

Fig 1. The Hybrid Assistive Limb (HAL).

Fig 1

(A) Illustration of HAL training (B) surface electromyography to capture the wearer’s voluntary muscle activation. Electrodes were affixed over the following muscles: biceps femoris (knee flexion), quadriceps vastus lateralis (knee extension) (in picture) and rectus femoris (hip flexion), gluteus maximus (hip extension) (not in picture). A reference electrode was placed over the lateral femur condyle. Photo: Johan Adelgren (A) and Carin Wesström (B). Consent for publication was obtained from the persons in the pictures.