مطالب

Introduction: The aim of present study was to determine the effect of biofeedback training on electrical activity of trapezius muscles and range of motion in people with shoulder impingement syndrome. Martials and Methods: In this study, 20 patients with shoulder impingement syndrome in age range of 20-40 y were selected as the statistical sample and were divided into experimental (n=10) and control (n=10) groups. The experimental group trained by using EMG biofeedback for 8 weeks and 3 sessions per week. The control group was applied only for pre-test and posttest measurements. For data collection, surface electromyography was used to analyze the muscle activity patterns of trapezius muscles (upper, middle, lower), and a goniometer was executed to evaluate the flexion. Shapiro-Wilk test was used to confirm the normality of the data and covariance analysis test was applied to compare pre-test and post-test. Correlated t-test was used to examine within-group changes. Results: In this study, after 8 weeks of biofeedback training in the experimental group, a significant improvement in the electrical activity of the middle trapezius (P=0.000) and lower trapezius muscles (P=0.016) was observed. In addition, a significant improvement in the amount of flexion range of motion (P=0.000) was indicated in the experimental group compared to the pretest and also the control group (P=0.05). However, no significant difference was shown in the muscle activity of the upper trapezius muscle (P=0.776). Conclusion: The present study showed that biofeedback training is effective to improve the electrical activity of trapezius muscle and flexion in people with SIS.

Introduction: Prescribing the Adrenergic beta-Antagonists is very common in treating cardiovascular diseases. The aim of this study was to compare the effects of aerobic training in patients with coronary artery disease, prescribed two different types of beta-blockers (selective and non- selective) on the patient's lipid profile (Lipoproteins) and FBS (Blood Glucose). Materials and Methods : Sixty patients with coronary artery disease, aged 45-65 years, were compared in two groups of selective (n=36) and non-selective (n=24) users of beta-blockers. The training program consisted of 8 weeks of aerobic exercise on the treadmill (3 sessions per week, about 50 minutes per session, with an intensity of 40% to 60% of the heart rate reserve). Each study patient’s lipid profile and FBS level were obtained before the onset of the study and after the end of the intervention. The collected data were analyzed using repeated-measures Analysis of Variance (ANOVA). Results: In the selective group, lipid profile and FBS did not significantly change. In the non-selective group, FBS and triglyceride levels were significantly reduced after the intervention; however, HDL, LDL, and total cholesterol levels were not significantly changed (P>0.05). Conclusion: The results of this study showed that aerobic training in patients with CAD who used non-selective beta-blockers has more positive effects.