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Chronic Effect Of Photobiomodulation Therapy On Muscle Function In Persons With Multiple Sclerosis: 390
... The maximal voluntary contractions (MVC) recovery test, used in two studies, was used to assess muscle strength. 14,15 The modified fatigue impact scale (MFIS) was used to measure muscle fatigue. 16 ...
... The maximal voluntary contractions (MVC) recovery test was used to assess muscle strength in two studies. 14 ...
... Regarding the randomization process, two studies presented a low risk of bias 14,15 and one an uncertain risk (16). Regarding the other domains: deviations from the planned interventions, lack of data in the results, measurement of the results and selection of the studies reported, the three studies included in this review [14][15][16] presented a low risk of bias. ...
Background: Photobiomodulation plays an important role in modulating the inflammatory process, accelerating tissue repair, which can be beneficial in cases such as multiple sclerosis. Objective: To carry out a literature review about effectiveness of photobiomodulation on muscle strength and fatigue in multiple sclerosis. Methods: The databases included were PubMed, Embase, Cochrane, Web of Science, Scopus and LILACS (Latin American and Caribbean Health Sciences Literature). Also the gray literature: Google Scholar, LIVIVO (ZB MED Search Portal for Life Sciences), Open Grey and Library of Thesis and Dissertations CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior). The risk of bias was assessed using the Cochrane tool, Rob 2, and the data was extracted and assessed by blinded reviewers. Results: Initially 7302 records were found, 7102 in the main databases and 200 in the gray literature. After removing duplicates, 4217 studies were left for Phase 1 and 10 for Phase 2. Finally, 3 randomized clinical trials were included in this review. Conclusion: The studies included risk of bias in this review was predominantly low. PBM proved to be effective in improving muscle strength, but not fatigue. However, the number of human clinical trials is still too few for a more conclusive analysis.
Background
Intense pulsed light (IPL) is used for the treatment and improvement of various skin issues. However, patients often experience local skin burning and pain after IPL treatment. Cooling and analgesic measures are indispensable.
Aims
To investigate the clinical effect of thermal shock therapy on pain relief and reduction of adverse reactions during IPL therapy.
Patients/Methods
A total of 60 female patients with facial photoaging who received IPL therapy were enrolled in the study. As a comparative split‐face study, one side of the face was randomly selected as the control side. The other side was given thermal shock therapy before and after the IPL treatment immediately as analgesic side. The visual analog scale (VAS) was used to evaluate the pain degree of the patients. The telephone follow‐ups regarding the occurrence of adverse reactions were conducted respectively on the 2nd day, 7th day, and 1 month after treatment.
Results
The VAS score and skin temperature of analgesia side was lower than that of control side at different stages of treatment. In terms of adverse reactions, the incidence of transient facial redness on the analgesic side was lower than that on the control side. Two patients showed slight secondary pigmentation on the control side, and the other patients showed no other adverse reactions on both sides.
Conclusions
Thermal shock therapy assisted IPL therapy can reduce skin temperature during treatment, effectively relieve patients' pain, reduce the occurrence of adverse reactions caused by heat injury, and improve patients' comfort level.
Photobiomodulation (PBM) therapy has been implicated as an effective ergogenic aid to delay the onset of muscle fatigue. The purpose of this study was to examine the dose–response ergogenic properties of PBM therapy and its ability to prolong time to task failure by enhancing muscle activity and delaying the onset of muscle fatigue using a static positioning task. Nine participants (24.3 ± 4.9 years) received three doses of near-infrared (NIR) light therapy randomly on three separate sessions (sham, 240, and 480 J). For the positioning task, participants held a 30 % one-repetition maximum (1-RM) load using the index finger until volitional fatigue. Surface electromyography (sEMG) of the first dorsal interosseous muscle was recorded for the length of the positioning task. Outcomes included time to task failure (TTF), muscle fatigue, movement accuracy, motor output variability, and muscle activity (sEMG). The 240-J dose significantly extended TTF by 26 % (p = 0.032) compared with the sham dose. TTF for the 240-J dose was strongly associated with a decrease in muscle fatigue (R
2 = 0.54, p = 0.024). Our findings show that a 240-J dose of NIR light therapy is efficacious in delaying the onset and extent of muscle fatigue during submaximal isometric positioning tasks. Our findings suggest that NIR light therapy may be used as an ergogenic aid during functional tasks or post-injury rehabilitation.
Soon after the discovery of lasers in the 1960s it was realized that laser therapy had the potential to improve wound healing and reduce pain, inflammation and swelling. In recent years the field sometimes known as photobiomodulation has broadened to include light-emitting diodes and other light sources, and the range of wavelengths used now includes many in the red and near infrared. The term "low level laser therapy" or LLLT has become widely recognized and implies the existence of the biphasic dose response or the Arndt-Schulz curve. This review will cover the mechanisms of action of LLLT at a cellular and at a tissular level and will summarize the various light sources and principles of dosimetry that are employed in clinical practice. The range of diseases, injuries, and conditions that can be benefited by LLLT will be summarized with an emphasis on those that have reported randomized controlled clinical trials. Serious life-threatening diseases such as stroke, heart attack, spinal cord injury, and traumatic brain injury may soon be amenable to LLLT therapy.
Context:
Near-infrared (NIR) light therapy is purported to act as an ergogenic aid by enhancing the contractile function of skeletal muscle. Improving muscle function is a new avenue for research in the area of laser therapy; however, very few researchers have examined the ergogenic effects of NIR light therapy and the influence it may have on the recovery process during rehabilitation.
Objective:
To evaluate the ergogenic effect of NIR light therapy on skeletal muscle function.
Design:
Crossover study.
Setting:
Controlled laboratory.
Patients or other participants:
Thirty-nine healthy men (n = 21) and women (n = 18; age = 20.0 ± 0.2 years, height = 169 ± 2 cm, mass = 68.4 ± 1.8 kg, body mass index = 23.8 ± 0.4 kg/m(2)).
Intervention(s):
Each participant received active and sham treatments on the biceps brachii muscle on 2 separate days. The order of treatment was randomized. A class 4 laser with a cumulative dose of 360 J was used for the active treatment. After receiving the treatment on each day, participants completed an elbow-flexion resistance-exercise protocol.
Main outcome measure(s):
The dependent variables were elbow range of motion, muscle point tenderness, and strength (peak torque). Analysis of variance with repeated measures was used to assess changes in these measures between treatments at baseline and at follow-up, 48 hours postexercise. Additionally, immediate strength loss postexercise was compared between treatments using a paired t test.
Results:
Preexercise to postexercise strength loss for the active laser treatment, although small, was less than with the sham treatment (P = .05).
Conclusions:
Applied to skeletal muscle before resistance exercise, NIR light therapy effectively attenuated strength loss. Therefore, NIR light therapy may be a beneficial, noninvasive modality for improving muscle function during rehabilitation after musculoskeletal injury. However, future studies using higher treatment doses are warranted.
To determine whether skeletal muscle oxidative metabolism is impaired in multiple sclerosis (MS), phosphorus magnetic resonance spectroscopy was used to measure the rate of intramuscular phosphocreatine (PCr) resynthesis following exercise in MS and controls. Thirteen MS patients underwent intermittent isometric tetanic contractions of the dorsiflexor muscles elicited by stimulation of the peroneal nerve. Eight healthy control subjects performed voluntary isometric exercise of the same muscles. During exercise, there were no differences between groups in the fall of either PCr or pH. However, the half-time (T1/2) of PCr recovery following exercise was significantly longer in MS (2.3 +/- 0.3 min) compared to controls (1.2 +/- 0.1 min, P < 0.02). These data provide evidence of slowed PCr resynthesis following exercise in MS, which indicates impaired oxidative capacity in the skeletal muscle of this group. This finding suggests that intramuscular changes consistent with deconditioning may be important in the altered muscle function of persons with MS.