Abstract
We investigated whether active assistive exercise using the Hybrid Assistive Limb (HAL®-SJ)
could improve muscle strength performance characteristics in patients with cerebral infarction during
Kaifukuki rehabilitation period. The patient was a 72-year-old man diagnosed with hemiplegia due
to cerebral infarction. The study used an AB single-case design, alternating between traditional
physiotherapy（Phase A）and HAL®-SJ (Phase B), with each phase lasting for 10 days. The knee
angular velocity and SIAS-motor showed improvement following Phase B. However, there was
no significant improvement in the knee extensor muscle strength and Motor-FIM scores on the
paralyzed side throughout Phase A and B. Active assistive exercise using HAL®-SJ in patients with
hemiplegia may be effective in providing the dynamic characteristics of muscle strength.
