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Electrophysiologic effect of gallium arsenide laser on frog gastrocnemius muscle *
Author(s) -
Comelekoglu Ulku,
Bagis Selda,
Buyukakilli Belgin,
Sahin Gunsah,
Erdogan Canan
Publication year - 2002
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.10027
Subject(s) - laser , compound muscle action potential , irradiation , gastrocnemius muscle , materials science , chemistry , biomedical engineering , electrophysiology , anatomy , skeletal muscle , optics , medicine , physics , nuclear physics
Background and Objective In this study, the effect of low energy Gallium arsenide (GaAs) laser irradiation on the compound action potential of frog gastrocnemius muscle were investigated. Study Design/Materials and Methods Sixty frogs were divided into different six dose groups: laser 1 (1 Hz), laser 2 ( 4 Hz), laser 3 (16 Hz), laser 4 (64 Hz), laser 5 (128 Hz), and laser 6 (1,000 Hz, DC, continue) (in each group n = 10). Low energy GaAs laser (wavelenght: 904 nm, pulsed duration: 220 nanoseconds, peak power per pulse: 27 W, total applied energy density: 0.001–25.7 J/cm 2 ) was used for the experiment. Compound muscle action potentials were recorded before laser irradiation and these data were accepted as control group. After recording the control data, each muscle was irradiated by the laser. Action potentials were recorded at 1, 5, 10, 15, and 20 minutes of irradiation time in each group by using standartized needle electromyography and nerve conduction study techniques. Distal motor latency, peak to peak amplitude, area, and total duration of action potential were measured. Repeated measures analysis of variance were used for the statistical evaluation. Results No significant differences were detected between control and laser dose groups in muscle action potential parameters. Conclusions This study revealed that at the different repetition rate and exposure time, low energy GaAs laser does not have any significant effect on frog gastrocnemius action potential. Lasers Surg. Med. 30:221‐226, 2002. © 2002 Wiley‐Liss, Inc.