Laser Biomedical Research in the USSR

Gamaleya, N. F.

doi:10.1007/978-1-4615-7326-5_1

Cited by 41 publications

(28 citation statements)

References 23 publications

(11 reference statements)

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“…The trend is not as clear when clinical reports on tissue repair are examined. Rather, sufficient differences of opinion seem evident between studies showing beneficial effects and those reporting no effects whatsoever [10,[33][34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Introductionmentioning

confidence: 99%

ATTENUATION AND PENETRATION OF VISIBLE 632.8nm AND INVISIBLE INFRA-RED 904nm LIGHT IN SOFT TISSUES

Enwemeka

2000

LASER THERAPY

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We studied the depth of penetration and the magnitude of attenuation of 632.8nm and 904nm light in skin, muscle, tendon, and cartilagenous tissues of live anaesthetized rabbits. Tissue specimens were dissected, prepared, and their thicknesses measured. Then, each wavelength of light was applied. Simultaneously, a power meter was used to detect and measure the amount of light transmitted through each tissue. All measurements were made in the dark to minimize interference from extraneous light sources. To determine the influence of pulse rate on beam attenuation, the 632.8nm light was used at two predetermined settings of the machine; continuous mode and 100 pulses per second (pps), at an on:off ratio of 1:1. Similarly, the 904nm infra-red light was applied using two predetermined machine settings: 292 pps and 2,336 pps. Multiple regression analysis of the data obtained showed significant positive correlations between tissue thickness and light attenuation (p < .001). Student's t-tests revealed that beam attenuation was significantly affected by wavelength. Collectively, our findings warrant the conclusions that (1) The calf muscles of the New Zealand white rabbit attenuates light in direct proportion to its thickness. In this tissue, light attenuation is not significantly affected by the overlying skin, a finding which may be applicable to other muscles. (2) The depth of penetration of a 632.8nm and 904nm light is not related to the average power of the light source. The depth of penetration is the same notwithstanding the average power of the light source. (3) Compared to the 904nm wavelength, 632.8nm light is attenuated more by muscle tissue, suggesting that is is absorbed more readily than the 904nm wavelength or conversely that the 904nm wavelength penetrates more. Thus, wavelength plays a critical role in the depth of penetration of light.

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Section: Introductionmentioning

confidence: 99%

ATTENUATION AND PENETRATION OF VISIBLE 632.8nm AND INVISIBLE INFRA-RED 904nm LIGHT IN SOFT TISSUES

Enwemeka

2000

LASER THERAPY

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“…The need to examine the action of different visible radiation wavelengths upon cellular cultures stemmed from the knowledge that disorders which respond to laser phototherapy, such as indolent wounds and trophic ulcers (see reviews of Mester, 1981;Gamaleya, 1977;Karu, 1989a) may be associated with increased proliferation of the cells surrounding the injuries (Karu, 1987).…”

Section: Introductionmentioning

confidence: 99%

Effects of Visible Radiation on Cultured Cells

Karu

1990

Photochem & Photobiology

170

118

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“…Clinically laser photo stimulation has been used to treat pain, tropic ulcers indolent wounds of diverse etiologies, bone repair and soft tissue injuries [18][19][20] . There are however, studies reporting conflicting results on the effects of laser photo stimulation on wound healing and its constituents [21][22][23] .…”

Section: Resultsmentioning

confidence: 99%

Influence of Helium-Neon Laser Photostimulation on Excision Wound Healing in Wistar Rats

Nayak¹,

Maiya²,

Kumar³

2007

OnLine J. of Biological Sciences

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Abstract:The importance of laser photostimulation is now accepted generally but the laser light facilitates wound healing and tissue repair remains poorly understood. So we have examined the hypothesis that the laser photo stimulation can enhances the collagen production in excision wounds using excision wound model in Wister rat model. The circular wounds were created on the dorsum of the back of the animals. The animals were divided into two groups. The experimental group (n = 12) wound was treated with 632.8 nm He-Ne laser at a dose of 2.1J cm −2 for five days a week until the complete healing. The control group was sham irradiated. The parameters studied were wound area, period of epithelization and hydroxyproline. Significant increase in the hydroxyproline content (p<0.001) and reduction in the wound size (p<0.001) was observed in study group when compared to controls. The significant epithelization (p<0.001) was noticed. The experimental wounds were, on average, fully healed by the 15th day, whereas the control group healed, on average by 22nd day. Wound contraction together with the hydroxyproline and experimental observations suggested that low intensity Helium-Neon laser photo stimulation facilitates the tissue repair process by accelerating collagen production in chronic wounds.

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Laser Biomedical Research in the USSR

Cited by 41 publications

References 23 publications

ATTENUATION AND PENETRATION OF VISIBLE 632.8nm AND INVISIBLE INFRA-RED 904nm LIGHT IN SOFT TISSUES

ATTENUATION AND PENETRATION OF VISIBLE 632.8nm AND INVISIBLE INFRA-RED 904nm LIGHT IN SOFT TISSUES

Effects of Visible Radiation on Cultured Cells

Influence of Helium-Neon Laser Photostimulation on Excision Wound Healing in Wistar Rats

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