Effect of Low-Power Gallium–Aluminum–Arsenium Noncoherent Light (640 nm) on Muscle Activity: A Clinical Study

Kelencz, Carlos Alberto; Muñoz, Ingrid Solange Sepúlveda; Amorim, César Ferreira; Nicolau, Renata Amadei

doi:10.1089/pho.2008.2467

Cited by 50 publications

(34 citation statements)

References 34 publications

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“…There has also been evidence that coherent and the non-coherent lights produce similar effects in biological tissues. This fact has been demonstrated in several studies [11,16,33,34] in which both types of light produced positive effects.…”

Section: Discussionmentioning

confidence: 59%

“…However, the biological effect of these light sources has been evaluated individually in previous studies [11,16,33,34]. Regarding possible differences around coherent light (laser) versus noncoherent light (LED), it has been shown that the coherence of light is not a determinant factor to the clinical effects of low-level lasers.…”

Section: Discussionmentioning

confidence: 99%

“…It has also been reported that the photochemical effects in the organism occur independently of light coherence, as the coherence is lost in the most superficial skin layer, before the light is absorbed by the chromophores of the subjacent cells [11]. There is evidence that both coherent and non-coherent lights can stimulate in vitro cell proliferation, transition from the inflammatory to the proliferative phase, and the activity of the superoxide dismutase enzyme, decreasing the oxidative stress [33,34]. There has also been evidence that coherent and the non-coherent lights produce similar effects in biological tissues.…”

Section: Discussionmentioning

confidence: 99%

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Correlation between light transmission and permeability of human dentin

et al. 2011

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The influence of dentin permeability on transdentinal LED light propagation should be evaluated since this kind of phototherapy may further be clinically used to stimulate the metabolism of pulp cells, improving the healing of damaged pulps. This study evaluated the influence of the dentin permeability on the transdentinal LED light (630 nm) transmission. Forty-five 0.5-mm-thick dentin disks were prepared from the coronal dentin of extracted sound human molars. An initial measurement of transdentinal LED light transmission was carried out by illuminating the discs in the occlusal-to-pulpal direction onto a light power sensor to determine light attenuation. The discs were treated with EDTA for smear layer removal, subjected to analysis of hydraulic conductance, and a new measurement of transdentinal LED light transmission was taken. Spearman's correlation coefficient was used for analysis of data and showed a weak correlation between dentin permeability and light attenuation (coefficient= 0.19). This result indicates that higher or lower dentin permeability does not reflect the transdentinal propagation of LED light. Significantly greater transdentinal propagation of light was observed after treatment of dentin surface with EDTA (Wilcoxon test, p<0.05). According to the experimental conditions of this in vitro study, it may be concluded that dentin permeability does not interfere in the transdentinal LED light transmission, and that smear layer removal facilitates this propagation.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Correlation between light transmission and permeability of human dentin

et al. 2011

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“…However, other authors have demonstrated positive effects of LLLT and LEDT in this wavelength range on muscle performance. [32][33] Ferraresi et al, 34 investigated the use of LLLT associated with strength training using leg-press exercises twice a week for 12 consecutive weeks. After each session, the LLLT group was subjected to the application of LLLT (808 nm wavelength;30 mW power output;47 seconds irradiation time;0.00785 cm² spot area;dose 180 J/ cm 2 ;irradiance 3.8 W/cm 2 ;1.4 J total energy per point/ section;and 5.6 J total energy per point per lower limb and 224 J total dose delivered over the whole protocol -40 sessions).…”

Section: Discussionmentioning

confidence: 99%

Effect of Low-Level Laser Therapy and Strength Training Protocol on Hand Grip by Dynamometry

et al. 2017

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Introduction: The purpose of this study was to investigate the effect of low-level laser therapy (LLLT) -660 nm and 904 nm -before grip strength protocol in healthy subjects. Methods:The study included 45 healthy volunteers with an average age of 22.7 (±1.4) years, subdivided into the following groups, control group: grip strength training associated with placebo LLLT; 660 nm group: LLLT (660 nm, 20 J/cm 2 , power of 30 mW, and beam area of 0.06 cm 2 , continuous, energy 1.2 J, and exposure time 40 seconds per point) before grip strength training and 904 nm group: LLLT (904 nm, 10 J/cm 2 , peak power of 70 W and 0.13 cm 2 beam area, with pulsed beam 9.500 Hz and 30 seconds of exposure time per point and emitted energy 1.2 J) before grip strength training. The LLLT was timed to contact 10 points located in the region of the superficial and deep flexor muscles of the fingers, with a total energy of 12.0 J per session. For the strength training protocol, the volunteer exercised their fingers with the dominant hand on a small table, elbow flexed at 90°, forearm in neutral, using a light extension handle. The Oxford protocol was performed during four weeks. The grip strength was assessed using a dynamometer (Jamar™). The data were evaluated by the analysis of variance (ANOVA) statistical method. Results: In the comparison of intragroup evaluation, only the 904 nm group showed a difference compared to the baseline assessment after 4 weeks (P < 0.05), in the final intergroup evaluation, a difference was observed in the comparison between the control and 904 nm groups. Conclusion: In conclusion, LLLT (904 nm) applied before resistance training was effective in gaining grip strength when compared to LLLT (660 nm) and isolated strength training after 4 weeks.

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“…Clinically, researchers have disputed over the possible loss of coherency when subjecting laser light to human tissues and recently have shown positive outcomes when using lightemitting diodes (LEDs) (non-coherent light sources) in experimental muscle injury [84,85].…”

Section: Coherencementioning

confidence: 99%

The Use of Photomedicine in Musculoskeletal Pain

Al-Shenqiti¹

2017

Photomedicine - Advances in Clinical Practice

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Musculoskeletal pain is a major cause of disability. Myofascial trigger points (MTrPs) in particular are a common source of pain in a substantial number of patients presenting at a pain clinic. Many different invasive and non-invasive forms have been advocated to the treatment of MTrPs. However, favourable outcome rates are inconsistent and some of these treatment forms described are often painful and have potentially dangerous side effects. Photomedicine including the coherent light sources (lasers) and more recently, non-coherent light sources have been reported to be beneficial in soft tissue lesions including MTrPs. Their beneficial therapeutic effects can be obtained without undesired effects. The main intentions of this chapter are to bring the attention of the doctors and physical therapists to the scientific approach of photomedicine, in particular laser therapy for the relief of pain arising from MTrPs, and to demonstrate how this type of therapy can be utilized in a rational manner for the relief of musculoskeletal pain. In addition, it has been found necessary to include or to start with an overview of the recently recognized diagnostic and therapeutic importance of MTrPs. Attention will therefore first be drawn mainly to incidence, types, aetiology, clinical diagnostic criteria and conventional forms of MTrPs.

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Effect of Low-Power Gallium–Aluminum–Arsenium Noncoherent Light (640 nm) on Muscle Activity: A Clinical Study

Abstract: It was concluded that LED can be used as a clinical tool to increase muscle activity (1.044 J per point) and to prevent fatigue (2.088 J per point), without change in the muscle force.

Cited by 50 publications

References 34 publications

Correlation between light transmission and permeability of human dentin

Correlation between light transmission and permeability of human dentin

Effect of Low-Level Laser Therapy and Strength Training Protocol on Hand Grip by Dynamometry

The Use of Photomedicine in Musculoskeletal Pain

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