Photobiomodulation Decreases Fatigue of the Wrist Extensors: Electromyographic and Dynamometric Analysis

2020 ◽  
Vol 12 (4) ◽  
pp. 535-541
Author(s):  
Vitor Souza ◽  
Rinaldo Guirro ◽  
Heloyse Kuriki ◽  
Gabriela de Carvalho ◽  
Alexandre Marcolino ◽  
...  
Keyword(s):  
Grip Strength ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Median Frequency ◽  
Fatigue Protocol ◽  
Wrist Extensor ◽  
Level Laser ◽  
Extensor Muscles ◽  
Wrist Extensor Muscles ◽  
Laser Group

This study analyzed the effects of photobiomodulation, on wrist extensor muscles when applied before a fatigue protocol. Twenty-eight men participated in a crossover, blinded, and controlled trial. Subjects performed grip dynamometry associated with superficial electromyography of the extensor carpi radialis, extensor carpi ulnaris, and flexor digitorum superficialis, which was used to evaluate muscle recruitment pattern by median frequency. The initial assessment was performed with a onerepetition maximum test. Twenty-four hours later the allocation was performed in two moments, and randomization was initially performed with 28 volunteers, divided between the two groups: control group, and the Low-Level Laser Therapy (30 mW, 0.06 cm2, 20 J/cm2, 1.2 J per point, and total energy of 10.8 J). Median frequency demonstrated Extensor Carpi Ulnaris fatigue in the control group as well as when compared after the fatigue protocol in the laser group. Exhaustion time was greater in the laser group and the fatigue protocol was effective at decreasing grip strength, with significant difference in the control group (p < 0.05). After the fatigue protocol, Low-Level Laser Therapy was effective in maintaining grip strength to increase exhaustion time and does not promote alterations in Median Frequency behavior at wrist extensor muscles.

scholarly journals Effect of Radiotherapy and Low-Level Laser Therapy on Circulating Blood Cells of Rats

2021 ◽  
Vol 12 (1) ◽  
pp. e45-e45
Author(s):  
Milene Castilhos de Oliveira ◽  
Gabriel Francisco Krueger ◽  
Juliana Tomaz Sganzerla ◽  
Humberto Thomazi Gassen ◽  
Pedro Antonio González Hernández ◽  
...  
Keyword(s):  
Blood Cell ◽  
Laser Therapy ◽  
Red Blood Cell ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Parotid Glands ◽  
Cell Counts ◽  
Blood Cell Counts ◽  
Level Laser ◽  
Laser Group

Introduction: This study aimed to investigate the effect of low-level laser therapy (LLLT) on the blood cell count when applied to parotid glands of rats irradiated by volumetric modular arc therapy (VMAT). Methods: Thirty-two adult male Wistar rats were used in this study. Samples were randomly assigned to three groups: control group (CG, n = 8), immediate laser group (24 hours) (ILG, n=12), and late laser group (120 hours) (LLG, n=12). The two laser groups were previously subjected to VMAT radiotherapy in a single dose of 12 Gy. LLLT with an AsGaAl laser (660 nm, 100 mW) was applied at three points in the region of the parotid glands, right side, with the energy of 2 J per point (20s, 70 J/cm2 ) and a spot size of 0.0028 cm2 for 10 consecutive days. In the euthanasia, blood samples were obtained by cardiac puncture. The samples from each group were processed by an automatic method and analyzed for erythrogram, leukogram and platelet count values. The data were analyzed by ANOVA and each LLLT time point was analyzed in relation to the control group, with a significance level less than 0.05. Results: Groups using LLLT had higher red blood cell counts, being higher in the LLG (p = 0.000). The hematimetric indices MCV (P=0.002) and MCH (P=0.009) were lower than the control group, especially when compared to the group using LLLT 120h after radiotherapy (LLG). White blood cell counts were lower in the groups with radiotherapy and immediate use of LLLT (ILG) (P=0.011), mainly at the expense of lymphocytes (P=0.002). Conclusion: The results suggest a potential systemic effect of LLLT, especially on circulating red blood cell counts, regardless of their time of immediate or late use of radiotherapy.

Assessment of healing of dental implant surgical site following Low-Level Laser Therapy using Bio-Clinical parameters: An Exploratory Study

2020 ◽  
Author(s):  
VARSHA PALLED ◽  
DR. JITENDRA RAO ◽  
DR. RAGHUWAR DAYAL SINGH ◽  
DR. SHUCHI TRIPATHI ◽  
DR. KALPANA SINGH ◽  
...  
Keyword(s):  
Laser Therapy ◽  
Test Group ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Clinical Parameters ◽  
Implant Stability ◽  
Low Level ◽  
Implant Stability Quotient ◽  
Low Level Laser ◽  
Level Laser

The purpose of this study was to evaluate whether Low-Level Laser Therapy (LLLT) improves the healing of the implant surgical site with clinical and biochemical parameters.Thirty patients with an edentulous space spanning a single tooth were selected. The patients were randomly allocated to two groups - the control group and the test group. The test group received laser energy at a power of 2J/cm 2 with a total of 4-6J energy over each implant. Clinical parameters (Implant Stability Quotient, probing index, modified sulcus bleeding index)and osteoprotegerin (OPG) were assessed at baseline and follow-up intervals (2 weeks, 6 weeks, and 3 months).The test group showed significantly higher implant stability quotient compared to thecontrol group at 2 weeks(57.93±3.95 and 35.67±3.08; p&lt;0.01) and 3months(58.86±3.75 and 67.06±3.78; p&lt;0.01). A significant rise in OPG levels of the test group(686.30±125.36pg/ml at baseline and 784.25±108.30pg/ml at 3months;p&lt;0.01) was seen contrary to significant decline in the control group (839.50±249.08pg/ml at baseline,415.30±78.39pg/ml at 3months;p&lt;0.01). Within the limitations of the study, the study suggests that the healing of peri-implant hard and soft tissues may be enhanced with the use of LLLT as an explicit modality during the post-operative period.

scholarly journals Combined effect of photobiomodulation with a matrix metalloproteinase inhibitor on the rate of relapse in rats

2015 ◽  
Vol 86 (2) ◽  
pp. 206-213 ◽  
Author(s):  
Sang-Hyun Lee ◽  
Kyung-A Kim ◽  
Stephanie Anderson ◽  
Yoon-Goo Kang ◽  
Su-Jung Kim
Keyword(s):  
Matrix Metalloproteinase ◽  
Relapse Rate ◽  
Combined Effect ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Protein Levels ◽  
Mmp Inhibitor ◽  
Irradiation Group ◽  
Level Laser ◽  
Relapse Rates

ABSTRACT Objective:  To investigate combined effect of photobiomodulation with a matrix metalloproteinase (MMP) inhibitor on the relapse rate in relation to MMP expression in rats. Materials and Methods:  Fifty-two rats were divided into four groups according to the treatment modality: control group, irradiation group, doxycycline group, and irradiation with doxycycline group. During a relapse period of 5 days after orthodontic movement, maxillary central incisors were treated by low-level laser therapy (LLLT) as a photobiomodulation and/or doxycycline as a synthetic MMP inhibitor. Relapse rate was evaluated in association with MMP expression at the gene and protein levels. Results:  Relapse rates were increased by LLLT (1.57-fold) and decreased by doxycycline (0.83-fold) compared with the control, showing positive correlation with the levels of expression for all MMPs in the periodontal ligament (PDL). LLLT concomitant with doxycycline administration resulted in no significant differences of relapse rate and MMP expression from the control. Conclusions:  The combined effect of photobiomodulation with an MMP inhibitor around the relapsing teeth proved to be antagonistic to PDL remodeling activity during relapse. This study suggests a basis for developing a novel biologic procedure targeting the MMP-dependent PDL remodeling to control the relapse rate.

scholarly journals Effect of low-level laser (Ga-Al-As 655 nm) on skeletal muscle fatigue induced by electrical stimulation in rats

2006 ◽  
Vol 101 (1) ◽  
pp. 283-288 ◽  
Author(s):  
Rodrigo Álvaro B. Lopes-Martins ◽  
Rodrigo Labat Marcos ◽  
Patrícia Sardinha Leonardo ◽  
Antônio Carlos Prianti ◽  
Marcelo Nicolas Muscará ◽  
...  
Keyword(s):  
Creatine Kinase ◽  
Electrical Stimulation ◽  
Muscle Contractions ◽  
Muscular Fatigue ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Low Level ◽  
Low Level Laser ◽  
Level Laser ◽  
Significant Difference

We investigated whether low-level laser therapy (LLLT) can reduce muscular fatigue during tetanic contractions in rats. Thirty-two male Wistar rats were divided into four groups receiving either one of three different LLLT doses (0.5, 1.0, and 2.5 J/cm2) or a no-treatment control group. Electrical stimulation was used to induce six tetanic muscle contractions in the tibial anterior muscle. Contractions were stopped when the muscle force fell to 50% of the initial value for each contraction (T50%). There was no significant difference between the 2.5 J/cm2 laser-irradiated group and the control group in mean T50% values. Laser-irradiated groups (0.5 and 1.0 J/cm2) had significantly longer T50% values than the control group. The relative peak force for the sixth contraction in the laser-irradiated groups were significantly higher at 92.2% (SD 12.6) for 0.5 J/cm2, 83.2% (SD 20.5) for 1.0 J/cm2, and 82.9% (SD 18.3) for 2.5 J/cm2 than for the control group [50% (SD 15)]. Laser groups receiving 0.5 and 1.0 J/cm2 showed significant increases in mean performed work compared with both the control group and their first contraction values. Muscle damage was indirectly measured by creatine kinase levels in plasma. A distinct dose-response pattern was found in which 1.0 and 2.5 J/cm2 LLLT groups had significantly lower creatine kinase levels than the 0.5 J/cm2 LLLT group and the control group. We conclude that LLLT doses of 0.5 and 1.0 J/cm2 can prevent development of muscular fatigue in rats during repeated tetanic contractions.

scholarly journals Orthokeratology and Low-Intensity Laser Therapy for Slowing the Progression of Myopia in Children

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Fen Xiong ◽  
Tian Mao ◽  
Hongfei Liao ◽  
Xiaoqin Hu ◽  
Lei Shang ◽  
...  
Keyword(s):  
Laser Therapy ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Myopia Progression ◽  
Level Laser ◽  
Spherical Equivalent Refraction ◽  
Treatment Changes ◽  
Low Intensity Laser Therapy ◽  
Intensity Laser ◽  
Myopia Control

Orthokeratology (OK) is widely used to slow the progression of myopia. Low-level laser therapy (LLLT) provides sufficient low energy to change the cellular function. This research is aimed at verifying the hypothesis that LLLT treatment could control myopia progression and comparing the abilities of OK lenses and LLLT to control the refractive error of myopia. Eighty-one children (81 eyes) who wore OK lenses, 74 children (74 eyes) who underwent LLLT treatment, and 74 children (74 eyes) who wore single-vision distance spectacles for 6 months were included. Changes in axial length (AL) were 0.23 ± 0.06   mm for children wearing spectacles, 0.06 ± 0.15   mm for children wearing OK lens, and − 0.06 ± 0.15   mm for children treated with LLLT for 6 months. Changes in subfoveal choroidal thickness (SFChT) observed at the 6-month examination were − 16.84 ± 7.85   μ m , 14.98 ± 22.50   μ m , and 35.30 ± 31.75   μ m for the control group, OK group, and LLLT group, respectively. Increases in AL at 1 month and 6 months were significantly associated with age at LLLT treatment. Changes in AL were significantly correlated with the baseline spherical equivalent refraction (SER) and baseline AL in the OK and LLLT groups. Increases in SFChT at 1 month and 6 months were positively associated with age at enrolment for children wearing OK lens. At 6 months, axial elongation had decelerated in OK lens-wearers and LLLT-treated children. Slightly better myopia control was observed with LLLT treatment than with overnight OK lens-wearing. Evaluations of age, SER, and AL can enhance screening for high-risk myopia, improve the myopia prognosis, and help determine suitable control methods yielding the most benefits.

EXTERNAL EXTENSION FORCE REDUCES ELECTROMYOGRAPHIC ACTIVITY OF THE WRIST EXTENSOR MUSCLES DURING GRIPPING

2003 ◽  
Vol 35 (Supplement 1) ◽  
pp. S318
Author(s):  
N van Elk ◽  
J G.M. Kooloos ◽  
M Massa ◽  
J A. de Lint ◽  
M T.E. Hopman
Keyword(s):  
Electromyographic Activity ◽  
Wrist Extensor ◽  
Extensor Muscles ◽  
Wrist Extensor Muscles ◽  
Extension Force

scholarly journals COMPARATIVE STUDY ON THE EFFECTIVENESS OF LOW LEVEL LASER THERAPY VERSUS PHONOPHORESIS IN THE MANAGEMENT OF LATERAL EPICONDYLITIS

2013 ◽  
Vol 03 (01) ◽  
pp. 35-44
Author(s):  
Mohamed Faisal C. K. ◽  
Mary Sumila ◽  
Lawrence Mathias ◽  
Ajith S.
Keyword(s):  
Soft Tissue ◽  
Laser Therapy ◽  
Lateral Epicondylitis ◽  
Soft Tissue Injuries ◽  
Low Level Laser Therapy ◽  
Low Level ◽  
Low Level Laser ◽  
Sodium Diclofenac ◽  
Level Laser ◽  
Laser Group

Abstract Background and Objectives: The use of electro physical agents for the management of any soft tissue injuries in Physical Therapy practice is very common for an early recovery from the injury. Among that, Low Level Laser Therapy (LLLT) and Phonophoresis are found to be very effective in soft tissue injuries. So the objective of this study is to know the comparative effectiveness of LLLT versus Phonophoresis in the treatment of lateral epicondylitis. Methods: Convenient sample of 40 patients with lateral epicondylitis were recruited for this study. They were assigned equally either to a laser (n = 20) or a Phonophoresis (n = 20) group. Laser group received the treatment with Ga-As (904nm) IR semiconductor diode laser. For Phonophoresis group a gel containing 1% sodium diclofenac was used as coupling agent. Each group was treated 3 times a week, for a total of 8 treatments, and was evaluated subjectively and objectively before and at the end of the treatment, by using VAS, pain free grip strength and functional pain scale as variables. Results: Comparison between laser group and Phonophoresis group is done using Mann Whitney U test. Comparison between pre and post is done using Wilcoxon's signed rank sum test. Form selection to the post treatment assessment, a significant decrease in symptoms was found in both laser and phonophoresis groups. But it is concluded that statistically; low level laser therapy was not significantly better than phonophoresis with the results of VAS (P = 0.53), FPS (P = 0.253), pain free grip strength. (P = 0.426). Interpretation and conclusions: The result of this study suggest that low level laser therapy as well as phonophoresis with sodium diclofenac gel as couplant medium gives a good result in the management of lateral epicondylitis. This study concludes that statistically there was no significant difference between Low level laser therapy and Phonophoresis with sodium diclofenac gel as coupling agent in the management of lateral epicondylitis.

scholarly journals A Randomized Comparative Study between High-Intensity and Low-Level Laser Therapy in the Treatment of Chronic Nonspecific Low Back Pain

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Walid Kamal Abdelbasset ◽  
Gopal Nambi ◽  
Saud F. Alsubaie ◽  
Ahmed M. Abodonya ◽  
Ayman K. Saleh ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Low Back Pain ◽  
Back Pain ◽  
Laser Therapy ◽  
High Intensity ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Low Back ◽  
Level Laser

Objectives. Chronic nonspecific low back pain (chronic nsLBP) is one of the most common musculoskeletal disorders leading to disabilities and physical inactivity. Laser therapy was used in chronic nsLBP treatment; however, no previous studies have assessed the impacts of high-intensity laser therapy (HILT) versus low-level laser therapy (LLLT) on chronic nsLBP. This study compared the effects of HILT versus LLLT on individuals suffering from chronic nsLBP. Methods. The study was a randomized control trial. Sixty individuals with chronic nsLBP were enrolled in this study between May and November 2019. All participants were clinically diagnosed with chronic nsLBP. They were assigned randomly into three groups, 20 in each group. The first group received a program of LLLT, the second group received a program of HILT, and the third did not receive laser therapy (control group). Pain severity, disability, lumbar mobility, and quality of life were assessed before and after 12-week intervention. Results. Both LLLT and HILT groups showed a significant improvement of the Oswestry Disability Index (ODI), visual analogue scale (VAS), lumbar range of motion (ROM), and European Quality of Life (EuroQol) scores ( p > 0.05 ), while the control group did not show significant changes ( p > 0.05 ). Comparison among the three study groups postintervention showed significant differences in the outcome measures ( p > 0.05 ), while comparison between the LLLT and HILT groups showed nonsignificant differences ( p > 0.05 ). Conclusion. There are no different influences of LLLT versus HILT on chronic nsLBP patients. Both LLLT and HILT reduce pain and disability and improve lumbar mobility and quality of life in chronic nsLBP patients.

ASSESSMENT ON RESULTS OF SURGICAL EXTRACTION OF&NBSP; IMPACTED LOWER THIRD MOLARS WITH POSTOPERATIVE LOW - LEVEL LASER THERAPY

2018 ◽  
Vol 8 (6) ◽  
pp. 130-137
Author(s):  
Huong Nguyen Thi Mai ◽  
Tai Tran Tan ◽  
Khanh Hong Quoc
Keyword(s):  
Laser Therapy ◽  
Third Molar ◽  
Low Level Laser Therapy ◽  
Control Group ◽  
Low Level ◽  
Impacted Third Molar ◽  
Low Level Laser ◽  
Level Laser ◽  
Surgical Extraction ◽  
Wisdom Teeth

Background: The most frequently performed surgical procedure in dentistry is impacted third molar extraction with difficulty varies according to the location of the tooth. Laser therapy after surgery can accelerate cell and tissue reconstruction along with relieve post-operative pain. The objective of this study was to investigate the clinical and radiographic characteristics of impacted lower third molar and to evaluate the results of surgical extraction of impacted lower third molar with post-surgical low-level laser therapy (LLLT). Subjects and Methods: Clinical and radiographic data from 90 patients (average age 28.13 ± 5.38) subjected to a surgical extraction of lower third molar were pooled and divided randomly into 3 groups: group 1 received LLLT immediately after surgery intraorally, group 2 treated with LLLT immediately after the extraction extraorally. Patients received routine management with nonactivated laser were inserted in the control group. Assessments of pain, swelling and trismus level were carried out at 24, 48 hours and on the 7th day after surgery. Results: Correlation of wisdom teeth to ramus and adjacent teeth mainly type II (88.9%), type III accounted for 11.1%. Relative depth of wisdom teeth in the bone mainly position B (81.1%), position C (18.9%). Correlation of wisdom teeth axis to adjacent teeth: horizontal (58.9%), mesioangular impactions (40%) and distoangular impaction (1.1%). There were statistically significant decreases in the level of pain, edema and interincisal opening between the laser-treated groups and the control group on the 1st and 2nd postoperative day. Conclusions: Intraoral and extraoral post-surgical low-level laser therapy treatment was useful in reducing swelling, pain and trismus compared to placebo group in impacted third molar surgery. Key words: Impacted lower third molar, low- level laser therapy

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