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Ex) Article Title, Author, Keywords

## Research Paper

Journal of the Optical Society of Korea 2011; 15(4): 373-379

Published online December 25, 2011 https://doi.org/10.3807/JOSK.2011.15.4.373

## Optical Spectroscopic Analysis of Muscle Spasticity for Low-Level Laser Therapy (LLLT)

Yeon-Ui Lee1, Sang-Kwan Lee2, and Jong-In Youn1

1Department of Biomedical Engineering, College of Medical Science, Catholic University of Daegu; 2Department of Internal Medicine and Neuroscience, College of Oriental Medicine, WonKwang University

Received: September 9, 2011; Revised: November 29, 2011; Accepted: November 30, 2011

### Abstract

Current therapeutic methods for suppressing muscle spasticity are intensive functional training, surgery, or pharmacological interventions. However, these methods have not been fully supported by confirmed efficacy due to the aggravation of the muscle spasticity in some patients. In this study, a combined system was developed to treat with a low-level laser and to monitor the region of the treatment using an optical spectroscopic probe that measures oxygen saturation and deoxygenation during low-level laser therapy (LLLT). The evaluation of the wavelength dependence for LLLT was performed using a Monte Carlo simulation and the results showed that the greatest amount of heat generation was seen in the deep tissue at ${\lambda}$ = 830 nm. In the oxy- and deoxygenation measurements during and after the treatment, oxygen-Hb concentration was significantly increased in the laser-irradiated group when compared to the control group. These findings suggest that LLLT using ${\lambda}$ = 830 nm may be of benefit in accelerating recovery of muscle spasticity. The combined system that we have developed can monitor the physiological condition of muscle spasticity during the laser treatment in real time and may also be applied to various myotonia conditions such as muscle fatigue, back-pain treatment/monitoring, and ulcer due to paralysis.

Keywords: Muscle spasticity, Low-level laser therapy, Optical diagnostic system, Hemoglobin concentration, Monte Carlo simulation,

OCIS codes: 170.0170; 000.1430; 120.6810; 170.6510

Wonshik Choi,
Editor-in-chief