TITLE:
Exploring Passive Exoskeleton-Induced Changes in Lumbar Muscle Activity
AUTHORS:
Ryo Fujitani, Hiroko Kawasaki, Mika Suzuki, Shogo Sakai, Souma Hori, Ryoga Muranishi, Shinichi Noguchi, Takumi Jiroumaru, Michio Wachi, Kouhei Okuyama
KEYWORDS:
Passive Exoskeleton, Low Back Pain, Muscle Activity, Adaptation
JOURNAL NAME:
Open Journal of Therapy and Rehabilitation,
Vol.11 No.4,
September
15,
2023
ABSTRACT: 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.