Long-term effects of photobiomodulation therapy on blood pressure in obese rats induced by a high-fat diet.

The main cardiovascular disease risk associated with obesity is hypertension. The therapeutic use of photobiomodulation therapy (PBM) is suggested for the treatment of wound healing, osteoarthritis, and arterial diseases. However, few studies have measured how red laser (at 660 nm) acts over hypertension, and any of those studies used experimental obesity model. The aim of the study was an attempt to evaluate the long-term effect of PBM on systolic blood pressure in an animal model of obesity, induced by a high-fat diet (HFD). Our results indicate that PBM carried out 3 days a week was able to prevent the increase in blood pressure (133.75 ± 4.82 mmHg, n = 8) induced by a high-fat diet (150.00 ± 4.57 mmHg, n = 8; p < 0.05), restore nitric oxide levels (control: 31.7 ± 5.5 µM, n = 8; HFD + PBM: 29.9 ± 3.7 µM, n = 8 > HFD: 22.2 ± 2.9 µM, n = 8, p < 0.05), decrease lipoperoxidation (control: 1.65 ± 0.25 nM, n = 8; HFD + PBM: 2.05 ± 0.55 nM, n = 8 < HFD: 3.20 ± 0.47 nM, n = 8; p < 0.05), and improve endothelial function (pD2 control: 7.39 ± 0.08, n = 8 > pD2 HFD + PBM: 7.15 ± 0.07, n = 8 > HFD: 6.94 ± 0.07, n = 8; p < 0.05). Our results indicate that PBM prevents the elevation of blood pressure in an obese animal model by a mechanism that involves improvement of endothelial function through an antioxidant effect.

Energy-dependent effect trial of photobiomodulation on blood pressure in hypertensive rats.

The main purpose of this work was to construct an energy-dependent response curve of photobiomodulation on arterial pressure in hypertension animal model. To reach this objective, we have used a two-kidney one clip (2K-1C) rat model. Animals received acute laser light irradiation (660 nm) on abdominal region using different energy (0.6, 1.8, 3.6, 7.2, 13.8, 28.2, 55.8, and 111.6 J), the direct arterial pressure was measured by femoral cannulation, and systolic arterial pressure (SAP), diastolic arterial pressure (DAP), heart rate (HR), and time of effect were obtained. Our results indicated that 660 nm laser light presents an energy-dependent hypotensive effect, and 28.2 J energy irradiation reached the maximum hypotensive effect, inducing a decreased SAP, DAP, and HR (decrease in SAP: - 19.23 ± 1.82 mmHg, n = 11; DAP: - 9.57 ± 2.23 mmHg, n = 11; HR: - 39.15 ± 5.10 bpm, n = 11; and time of hypotensive effect: 3068.00 ± 719.00 s, n = 11). The higher energy irradiation evaluated (111.6 J) did not induce a hypotensive effect and induced an increase in HR (21.69 ± 7.89 bpm, n = 7). Taken together, our results indicate that red laser energy irradiation from 7.2 to 55.8 J is the effective therapeutic window to reduce SAP, DAP, MAP, and HR and induce a long-lasting hypotensive effect in rats, with effect loss at higher energy irradiation (111.6 J).

Photobiomodulation induces hypotensive effect in spontaneously hypertensive rats.

To evaluate whether acute photobiomodulation can elicit a hypotensive effect in spontaneously hypertensive rats (SHR). Male SHR were submitted to the implantation of a polyethylene cannula into the femoral artery. After 24 h, baseline measurements of the hemodynamic parameters: systolic, diastolic, and mean arterial pressure, and heart rate were accomplished for 1 h. Afterwards, laser application was simulated, and the hemodynamic parameters were recorded for 1 h. In the same animal, the laser was applied at six different positions of the rat's abdomen, and the hemodynamic parameters were also recorded until the end of the hypotensive effect. The irradiation parameters were red wavelength (660 nm); average optical power of 100 mW; 56 s per point (six points); spot area of 0.0586 cm2; and irradiance of 1.71 W/cm2 yielding to a fluency of 96 J/cm2 per point. For measuring plasma NO levels, blood was collected before the recording, as well as immediately after the end of the mediated hypotensive effect. Photobiomodulation therapy was able to reduce the systolic arterial pressure in 69% of the SHR submitted to the application, displaying a decrease in systolic, diastolic, and mean arterial pressure. No change in heart rate was observed. Nevertheless, there was an increase in serum nitric oxide levels in the SHR responsive to photobiomodulation. Our results suggest that acute irradiation with a red laser at 660 nm can elicit a hypotensive effect in SHR, probably by a mechanism involving the release of NO, without changing the heart rate.

Effect of Red Light-Emitting Diodes Irradiation on Hemoglobin for Potential Hypertension Treatment Based on Confocal Micro-Raman Spectroscopy.

Red light-emitting diodes (LED) were used to irradiate the isolated hypertension hemoglobin (Hb) and Raman spectra difference was recorded using confocal micro-Raman spectroscopy. Differences were observed between the controlled and irradiated Hb by comparing the spectra records. The Raman spectrum at the 1399 cm-1 band decreased following prolonged LED irradiation. The intensity of the 1639 cm-1 band decreased dramatically in the first five minutes and then gradually increased in a time-dependent manner. This observation indicated that LED irradiation increased the ability of oxygen binding in Hb. The appearance of the heme aggregation band at 1399 cm-1, in addition to the oxygen marker band at 1639 cm-1, indicated that, in our study, 30 min of irradiation with 15.0 mW was suitable for inhibiting heme aggregation and enhancing the oxygen-carrying capacity of Hb. Principal component analysis showed a one-to-one relationship between irradiated Hb at different time points and the corresponding Raman spectra. Our approach could be used to analyze the hemoglobin from patients with confocal micro-Raman spectroscopy and is helpful for developing new nondrug hypertension therapy.

Hypotensive acute effect of photobiomodulation therapy on hypertensive rats.

The purpose of this study was to evaluate the acute effect of photobiomodulation therapy (PBM) on arterial pressure in hypertensive and normotensive rats with application in an abdominal region. Normotensive (2K) and hypertensive (2K-1C) wistar rats were treated with PBM. Systolic arterial pressure (SAP), diastolic arterial pressure (DAP), mean arterial pressure (MAP) and heart rate (HR) were measured before, during and after PBM application. The nitric oxide (NO) serum concentration was measured before and after PBM application. Vascular reactivity study was performed in isolated thoracic aortas. Aluminum gallium arsenide (GaAlAs) diode laser was used, at 660nm wavelength and 100mW optical output. The PBM application induced a decrease of SAP in 2K-1C rats. In 2K rats, the PBM application had no effect on SAP, DAP and MAP. Moreover, the magnitude of hypotensive effect was higher in 2K-1C than in 2K rats. The PBM application induced a decrease of HR in 2K-1C and 2K, with higher effect in 2K-1C rats. In 2K-1C, the hypotensive effect induced by PBM was longer than that obtained in 2K rats. PBM application induced an elevation of NO concentration in serum from 2K-1C and 2K rats, with higher effect in 2K-1C. In isolated aortic rings PBM effect is dependent of NO release, and is not dependent of nitric oxide synthase (NOS) activation. Our results indicate that the abdominal acute application of PBM at 660nm is able to induce a long lasting hypotensive effect in hypertensive rats and vasodilation by a NO dependent mechanism.

Long-term antihypertensive effects of far-infrared ray irradiated from wooden board in spontaneously hypertensive rats.

BACKGROUND: Far-infrared ray (FIR) has been widely used in promoting health and has been shown to exert beneficial effects in vascular function. The non-thermal effect of FIR has been found to play a significant role in the protective effect on some vascular-related diseases, but its protective effects and use against hypertension have not been clearly presented. METHODS: In the present study, by using a wooden board coated with FIR-irradiated materials, we evaluated the long-term antihypertensive effect on spontaneously hypertensive rats (SHRs) in the environment in contact with the FIR-irradiated wooden board. SHRs were placed on the wooden board with or without FIR radiation for 4 weeks. RESULTS: The systolic blood pressure (BP) of SHRs undergoing different treatments was measured weekly using a tail-cuff method. FIR radiation significantly reduced the systolic BP of the SHRs along with a decreasing plasma level of angiotensin II and an increasing plasma level of bradykinin. In addition, long-term contact of FIR did not significantly affect the BP in normotensive Wistar Kyoto rats (WKYs). CONCLUSIONS: Our results provided the evidence based on which FIR radiation could be considered an effective non-pharmacological choice for preventing hypertension.

Hemodynamic effect of laser therapy in spontaneously hypertensive rats.

Systemic arterial hypertension (SAH) is considered to be the greatest risk factor for the development of neuro-cardiovascular pathologies, thus constituting a severe Public Health issue in the world. The Low-Level Laser Therapy (LLLT), or laser therapy, activates components of the cellular structure, therefore converting luminous energy into photochemical energy and leading to biophysical and biochemical reactions in the mitochondrial respiratory chain. The LLLT promotes cellular and tissue photobiomodulation by means of changes in metabolism, leading to molecular, cellular and systemic changes. The objective of this study was to analyze the action of low-level laser in the hemodynamic modulation of spontaneously hypertensive rats, in the long term. Animals (n = 16) were randomly divided into the Laser Group (n = 8), which received three weekly LLLT irradiations for seven weeks, and into the Sham Group (n = 8), which received three weekly simulations of laser for seven weeks, accounting for 21 applications in each group. After seven weeks, animals were cannulated by the implantation of a catheter in the left carotid artery. On the following day, the systemic arterial pressure was recorded. The Laser Group showed reduced levels of mean blood pressure, with statistically significant reduction (169 ± 4 mmHg* vs. 182 ± 4 mmHg from the Sham Group) and reduced levels of diastolic pressure (143 ± 4 mmHg* vs. 157 ± 3 mmHg from the Sham Group), revealing a 13 and 14 mmHg decrease, respectively. Besides, there was a concomitant important decline in heart rate (312 ± 14 bpm vs. 361 ± 13 bpm from the Sham Group). Therefore, laser therapy was able to produce hemodynamic changes, thus reducing pressure levels in spontaneously hypertensive rats.

[Magnetic-laser influence on the system of nitric oxide and contractile activity of smooth muscles of rat aorta under hypertension].

The study was conducted on three groups of rats: Group I included Wistar rats with normal blood pressure (first control group); group II - rats with genetically determined hypertension (second control group); group Ill - rats with genetically determined hypertension under the influence ofmagnetic-laser power (study group). For the low-intensively magnetic-laser influence (MLI) we have used device MIT-MT, Ukraine, which was designed for the treatment of low-frequency magnetic field using optical flow blue and red ranges of spectrum. The MLI duration was 15 minutes for the blue range, and 25 minutes for the red one. Biochemical studies included the determination of the activity of isoenzymes of NO-synthase: constitutive (cNOS) and inducible (iNOS), the content of free hemoglobin, stable metabolites of NO, namely nitrite - (NO2(-)) and nitrate - (NO3(-)) anions, resistance to acid hemolysis of red blood cells. The contractile activity of smooth muscles of the aorta was measured. We found that magnetic-laser exposure of rats with genetically determined hypertension in the red (630 nm) and blue (470 nm wavelength) optical range even after a single session leads to an increased synthesis of nitric oxide in the blood plasma. Our data sindicate that the most effective in the intensification of endogenous nitric oxide (increase of NO2(-) and reduction of NO3(-)) and endothelium-dependent responses of aorta in rats with genetically determined hypertension was a ten-day course of the magnetic-laser exposure in the optical flow of the blue spectral range. Also, after 10 sessions of magnetic-laser exposure in rats from the above specified spectrum a stabilization of erythrocyte membranes was observed.

[Combined application of magnetolaserotherapy and polyunsaturated fatty acids for the treatment of patients with hypertensive disease].

The authors report the results of combined treatment including application of magnetolaserotherapy and n-3 polyunsaturated fatty acids for the management of patients presenting with hypertensive disease. These data give evidence of the accumulation of atherogenic fractions of plasma lipids and pathological modification of the fatty acid composition in erythrocyte membranes. They suggest the appropriateness of lipid-correcting and membrane-protective treatment for patients presenting with hypertensive disease. It is concluded that the proposed combination of magnetolaserotherapy and polyunsaturated fatty acids may be instrumental in the normalization of the serum lipid profile and the correction of the cellular fatty acid composition.

[Potentials of combined non-medication therapy of arterial hypertension associated with ischemic heart disease].

The objective of the present work was to develop methods and a scientifically sound rationale for the optimization of clinical results of the treatment of patients presenting with arterial hypertension (AH) associated with coronary heart disease (CHD) using red and infra-red (IR) low-intensity laser irradiation. The study included a total of 90 patients of working age (62.2% of men and 37.8% of women) having AH associated with coronary heart disease and abnormal blood lipid spectrum. They were allocated to three groups each comprising 30 patients matched for age, sex, severity of clinical conditions, and character of maintenance medicamental therapy. Patients of group 1 were treated by intravenous blood irradiation with laser light; those in group 2 were given similar treatment in combination with external low-intensity IR laser therapy; patients of group 3 received basal medicamental therapy. The study allowed the clinical value of different variants of low-intensity laser therapy to be assessed as regards efficiency of correction of hypersympaticotony, disturbances of lipid metabolism, and refractoriness to pharmaceutical products as well as improved tolerance of physical exercises, anti-hypertensive, anti-ischemic, and anti-anginal effects, diastolic function, and quality of life as targets of the comprehensive rehabilitative program designed for patients with AH associated with coronary heart disease. An optimized therapeutic modality is proposed for patients presenting with these pathologies based on the application of the low-intensity laser irradiation regime characterized by mutual amplification and complementary action of red and infrared lights.

[Effect of intravenous laser blood irradiation on endothelial dysfunction in patients with hypertensive disease].

The aim of this work was to study effect of intravenous laser blood irradiation (ILBI) on endothelial dysfunction in 120 patients (mean age 53.4 +/- 1.3 yr) with grade I-II hypertensive disease (HD) allocated to 2 groups. Traditional drug therapy given to patients of control group was supplemented by ILBI using a Mulat laser therapy device in the study group. Endothelial function was evaluated from the total plasma concentration of stable NOx metabolites, nitrates (NO3-), nitrites (NO2-), and Willebrand's factor. HD patients were found to have elevated activity of the Willebrand factor and show 3 types of response of the NO generating system: (1) decreased NO synthesis, (2) lack of its changes, and (3) increased NO synthesis. NO production in HD patients negatively correlated with systolic (r = -0.59) and diastolic (r = - 0.64) arterial pressure (AP) which suggests the relationship between decreased NO production and elevated AP. Inclusion of ILBl in the therapy of HD resulted in a significant decrease of Willebrand's factor activity and normalization of the NO level regardless of its initial value.

[Laser-, ultraphono-, and acupuncture in complex treatment of patients with hypertension]. / Lazero-, ul'trafono- i akupunktura v kompleksnom lechenii bol'nykh gipertonicheskoi bolezn'iu.

368 patients with hypertensive disease stage I and II were examined and treated either with laser puncture or acupuncture. Laser puncture was effective at stage I of hypertensive disease while acupuncture had a more potent hypotensive effect and can be used both in hypertensive disease stage I and II. Action on the acupuncture points and zones normalizes also parameters of the central and peripheral hemodynamics in hypertensive patients.

[The efficiency of low-intensity laser radiation in the treatment of arterial hypertension complicated by ischemic heart disease]. / Effektivnost' ispol'zovaniia nizkointensivnogo lazernogo izlucheniia pri lechenii arterial'noi gipertonii i ee sochetaniia s ishemicheskoi bolezn'iu serdtsa.

The efficiency of low-intensity laser radiation (LILR) was studied in the treatment of 291 patients with arterial hypertension and ischemic heart disease. Clinical grounds are given for use of LILR red and infrared rays in rehabilitation of hypertensive patients with ischemia. The rehabilitation regimens can be differentiated according to the disease severity, type of hemodynamics, state of cerebral circulation.

[Magnetotherapy of initial manifestations of cerebrovascular disorders in hypertension]. / Magnitoterapiia nachal'nykh proiavlenii sosudistykh porazhenii mozga pri gipertonicheskoi bolezni.

The paper is concerned with the data on 147 subjects who underwent magnetotherapy with the unit "Magniter-AMT-01" applied to the cervical area. The main group included 102 subjects, 45 person served as control. The purpose of the work was to base the application of MT under inpatient and home conditions with the use of the above-indicated unit. In view of this fact, a study was made of cerebral hemo- and thermodynamics with the aid of rheoencephalography and encephaloradiothermography under the action of different modes of the functioning of the unit "Magniter-AMT-01" (pulse and variable magnet induction fields 12-15 mTl and 30-35 mTl). A method of measuring magnetosensitivity of patients depending on the temperature reaction of the brain to a single MT session was elaborated. The greatest clinical effect was attained with the use of pulse magnetic field 15 mTl. Magnetotherapy with the use of the unit "Magniter-AMT-01" provided good results under inpatient and home conditions. The magnetosensitive patients demonstrated the highest effect.

[Optimization of the treatment of patients with hypertensive disease from the rheological viewpoint]. / Optimizatsiia lecheniia bol'nykh gipertonicheskoi bolezn'iu s reologicheskikh pozitsii.

The efficacy of various modes of correcting rheological disorders (membrane-protective agents, laser irradiation, plasmapheresis was compared in hypertensive patients. In 30% of the patients, the conventional antihypertensive therapy was demonstrated to deteriorate hemorheological parameters, which was due to its atherogenic impact on the blood lipid spectrum. Essential phospholipids, laser irradiation, and plasmapheresis, which are supplemented to the multimodality therapy promote a significant improvement of hemorheological parameters, which makes it possible to recommend them for management of hypertensive patients with a stable (essential phospholipids), complicated (laser irradiation), and refractory (plasmapheresis) course.

[Is cholesterol lowering following UVA blood irradiation an effect of citrate?]. / Ist die Cholesterolsenkung nach UVA-Blutbestrahlung (UVAB) eine Zitratwirkung?

On 92 patients the effect of the UV irradiation of blood on the blood parameters is studied. In the blood picture a decrease of leucocytes and reticulocytes is observed, in which case the latter is in connection with the decrease of blood and not with the UVA irradiation. In test persons with increased cholesterol level after UVA therapy as well as after a mere citrate infusion (anticoagulancy) during four weeks highly significant decrease of the cholesterol level, above all of the LDL-cholesterol appears. HDL cholesterol and triglycerides are not influenced. The decrease of cholesterol by citrate infusion is discussed and it is referred to possible therapeutic consequences.