Author(s)

Ryo Fujitani¹, Hiroko Kawasaki¹, Mika Suzuki¹, Shogo Sakai¹, Souma Hori¹, Ryoga Muranishi¹, Shinichi Noguchi¹, Takumi Jiroumaru², Michio Wachi², Kouhei Okuyama²

¹Department of Physical Therapy, Biwako Professional University of Rehabilitation, Higashiomi, Japan.
²Department of Physical Therapy, Bukkyo University, Kyoto, Japan.

Purpose: The purpose of this study was to evaluate the effect of using a passive exoskeleton on lumbar muscle activity during lifting movements, and to determine whether muscle activity remains altered after exoskeleton removal. This study sought to identify the potential risks and benefits associated with the use of passive exoskeletons for the prevention and treatment of low back pain. Methods: Eighteen healthy adult participants lifted a 10 kg suitcase while wearing a passive exoskeleton. Muscle activity and postures were measured during lifting and before, during, and after exoskeleton use. This study examined whether the reduced muscle activity observed during exoskeleton use persisted after exoskeleton removal. Muscle activity was assessed using electromyography and postures were recorded using reflective markers and a camera. Results: The study found that Lumbar muscle activity decreased significantly (approximately 40%) during exoskeleton use compared to that without exoskeleton use. Importantly, lumbar muscle activity remained low after exoskeleton removal, at levels similar to those observed during exoskeleton use. This suggests that individuals adapted to the exoskeleton support and maintained altered muscle control, even without the exoskeleton. Conclusion: This study demonstrates that passive exoskeletons significantly reduce lumbar muscle activity during lifting tasks, and that this altered muscle control persists after exoskeleton removal. These findings contribute to the understanding of the risks and benefits of passive exoskeletons, potentially aiding their development and informing their use in the prevention and treatment of low back pain.

Passive Exoskeleton, Low Back Pain, Muscle Activity, Adaptation

Fujitani, R. , Kawasaki, H. , Suzuki, M. , Sakai, S. , Hori, S. , Muranishi, R. , Noguchi, S. , Jiroumaru, T. , Wachi, M. and Okuyama, K. (2023) Exploring Passive Exoskeleton-Induced Changes in Lumbar Muscle Activity. Open Journal of Therapy and Rehabilitation, 11, 149-157. doi: 10.4236/ojtr.2023.114011.