Laser therapy of muscle injuries

Abstract

Low-level lasers are used in general therapy and healing process due to their good photo-bio-stimulation effects. In this paper, the effects of diode laser and Nd:YAG laser on the healing process of practically managed skeletal muscle trauma has been successfully studied. Standard impact trauma was induced by using a specially designed mechanical device. The impacted muscle was left for 3 days for complete development of blunt trauma. After that it was irradiated by five laser sessions for 5 days. Two types of lasers were used; 785-nm diode laser and 1.064-nm Nd:YAG laser, both in continuous and pulsed modes. A special electronic circuit was designed and implemented to modulate the diode laser for this purpose. Tissue samples of crushed skeletal muscle have been dissected from the injured irradiated muscle then bio-chemically analyzed for the regeneration of contractile and collagenous proteins using Lowry assay for protein determination and Reddy and Enwemeka assay for hydroxyproline determination. The results showed that both lasers stimulate the regeneration capability of traumatized skeletal muscle. The diode laser in CW and pulsed modes showed better results than the Nd:YAG in accelerating the preservation of the normal tissue content of collagenous and contractile proteins beside controlling the regeneration of non-functional fibrous tissue. This study proved that the healing achieved by the laser treatment was faster than the control group by 15-20 days.

Carcass Yields and Meat Composition of Male and Female Italian Slow-Growing Chicken Breeds: Bianca di Saluzzo and Bionda Piemontese

“…Hydroxyproline is a secondary amino acid and is found almost exclusively in the connective tissue protein collagen. Consequently, the collagen content of meat can be measured indirectly by measuring hydroxyproline [47]. The HP concentration was significantly higher in BP females and BS males at 7 and 8 months of age.…”

The Effect of High-Intensity Laser Therapy on Trapezius Focal Myositis: A Rare Case Report

“…The laser as a new modality has been used in the treatment of a variety of acute and chronic musculoskeletal injuries, degenerative conditions, and wound healing. 10 Ramos et al studied the effect of laser photobiomodulation on muscle injury in rats. They used male Wistar rats (200 g) and performed tibialis muscle elongation by passive stretching of the anterior tibial muscle attached to a weight corresponding to 150% of the body mass of the animal.…”

High final energy of gallium arsenide laser increases MyoD gene expression during the intermediate phase of muscle regeneration after cryoinjury in rats

“…The most LLLT used in in vivo and in vitro studies are helium-neon (HeNe), gallium arsenide (GaAs), gallium arsenide aluminum (AsGal), and Indio-gallium-aluminum-phosphide (IngGaAlP), and the wavelength ranges from 660 to 830 nm [10][11][12][13]. However, to date, only few studies investigated the effects of GaAs laser on skeletal muscle regeneration, with some studies showing positive results [7,[14][15][16], but not all [17].…”