Visual feedback using a smart-phone mirroring system influences trunk muscle activity and kinematics of the trunk and pelvis in healthy and chronic low-back pain groups during arm and leg lift in quadruped position
Affiliations: [a] Department of Physical Therapy, College of Health and Welfare, Woosong University, Daejeon, Korea | [b] Applied Kinesiology and Ergonomic Technology Laboratory, Department of Physical Therapy, The Graduate School, Yonsei University, Wonju, Korea
Correspondence:
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Corresponding author: Heon-Seock Cynn, Department of Physical Therapy, The Graduate School, Yonsei University, 1 Yonseidae-gil, Wonju, Kangwon-do 220-710, Korea. E-mail: cynn@yonsei.ac.kr
Abstract: BACKGROUND: Inappropriate motor patterns such as incorrect roll out
of the pelvis should be avoided during stabilization exercise in patients or
also in healthy individuals.
OBJECTIVE: To investigate the effects of visual feedback (VF) on
internal oblique (IO), external oblique (EO), multifidus (MF), and erector
spinae (ES) and the kinematics of the trunk and pelvis between healthy and
chronic low back pain (CLBP) groups during arm and leg lift in quadruped
(ALLQ) position.
METHODS: Ten apparently healthy subjects and 10 patients with CLBP
performed ALLQ position with and without VF while being monitored using sEMG
and a motion analysis system.
RESULTS: In comparison to non-VF condition, a VF was associated
with a significant increase in the EMG activity of both IOs, decrease in MF
and decrease in right ES in the CLBP. Right ES activity significantly
increased in the CLBP when VF was not present. Axial rotation of the pelvis
decreased in the healthy group with VF.
CONCLUSION: VF applied through wireless smart-phone mirroring
system has a selective positive effect on trunk muscles and pelvic movement
and may be beneficial for CLBP patients. Further research is necessary to
explore this novel approach to muscle and segment action.
Keywords: EMG, movement dysfunction, stabilization
