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Showing 3 results for Electromyography
Determination Of The Timing And Level Of Activities Of Lumbopelvic Muscles In Response To Postural Perturbations
Kalbasi G, Talebian Moghaddam S, Ebrahimi Takamjani S, Oliaei Gr, Maroofi N, Galaei S,
Volume 63, Issue 2 (5-2005)
Abstract

Background: One of the most important concerns in orthopedic medicine is the low back. Considering the importance of muscle function in preventing LBT by controlling too much load and stress applied on the spinal joints and ligaments.

Materials and Methods: The aim of this research was to determine the timing and level of activities of lumbopelvic muscles in response to postural perturbations caused by unexpected loading of the upper limbs in standing on three different supporting surfaces (neutral, positive slope, negative slope) in 20 healthy females 18 to 30 years old ( = 23.20 SD = 2.55 ). The electromyographic signals were recorded from the deltoid, gluteus maximus, internal oblique abdominis and lumbar paraspinal muscles of the dominant side of the body to evaluate the onset time, end time, level of muscle activity (RMS) and duration of different muscles in one task and one muscle in different tasks.

Results: The results showed that the agonists (posterior muscles) activated at first to compensate the flexor torque caused by loading and then the antagonists (anterior muscles) switched-on to compensate the reaction forces caused by agonist activities. With regards to continuous activity of internal oblique and its attachments via thoracalumbar fascia to the transverse processes of the lumbar vertebrae, it can be considered as one of the major stabilizer muscles of the trunk .

Conclusion: Finally the results indicated that supporting surface type didn’t have any effect on timing and scaling of muscle activities in different tasks suggesting that probably spinal and trunk priprioceptors are just responsible for triggering postural responses and they don’t have any role in determining timing and scaling.


The accommodation of EMG and MRI findings in patients with radicular low back pain
Koushan A, Sadat Mm, Golbakhsh Mr, Siavashi B, Mehran S, Tajik A,
Volume 68, Issue 5 (8-2010)
Abstract

Background: There are multiple diagnostic methods for evaluation of patients with low back pain with a radicular pattern, each one has it's own accuracy and diagnostic ability and so comparing them with each other would help the clinicians to find the best diagnostic method. The main objective of our study was to compare the diagnostic accommodation of electromyography (EMG) and Magnetic Resonance Imaging (MRI) findings in patients with low back pain and radiculopathy.

Methods: In this descriptive cross-sectional study, 101 patients with low back pain and radiculopathy attending to Sina Hospital in Tehran, Iran from 2007 to 2009 that had indication for both EMG and MRI were evaluated for their demographic characteristics and disease-related factors.

Results: Totally, 90 out of 101 patients (89%) had abnormal EMG findings and 94 out of 101 subjects (93%) had abnormal MRI results. The concordance rate was 88% (89 patients) with no significant difference (p> 0.05). The sensitivity and specificity of MRI were 95.6% and 27.3%, respectively, and the sensitivity and specificity of EMG were 91.5% and 60%, respectively.

Conclusion: According to the results of this study and in comparison with other studies it may be concluded that MRI and EMG are both accurate and use of them in a concomitant manner would result in increased diagnostic ability in patients with low back pain and radiculopathy.
Comparison of the electrical activity of trunk core muscles and knee muscles in subjects with and without patellofemoral pain syndrome during gait
Raheleh Dorosti , Mehri Ghasemi , Khosro Khademi-Kalantari, Alireza Akbarzadeh-Baghban ,
Volume 75, Issue 7 (10-2017)
Abstract
Background: Patellofemoral pain syndrome (PFPS) is known as one of the most frequent knee diseases and is the most frequent cause of anterior knee pain. Despite the high prevalence of the disease, its predisposing factors are not clearly known. Neuromuscular control disorders of hip and lumbopelvic complex and instability of core redounds to instability of whole movement pack chain. The aim of the present was to comparing the electromyographic activities of core muscles and muscles around the knee joint during gait in patients with PFPS with healthy subjects.
Methods: This descriptive-analytic case-control study was carried out in School of Rehabilitation in Shahid Beheshti University of Medical Sciences, Tehran, Iran. The present study was carried out during 10 months (April to February in 2016). Thirty-two subjects containing 17 patients with patellofemoral pain syndrome (10 females and 7 males) and 18 healthy subjects (10 females and 8 males) participated in this study. In both groups the electrical activities of some of the muscles around the knee joint and the core muscles containing vastus medialis (VM), adductor longus (AL), gluteus maximus (G Max), external oblique abdominis (EOA), internal oblique abdominis (IOA), transverse abdominis (TA) and multifidus (M) were recorded during gait. Onset and offset time, duration and intensity of muscles activities were compared between two groups.
Results: The results of the study showed that duration and intensity of the electrical activity of the gluteus maximus (respectively P=0.03, P=0.035) and offset time of electrical activity of the internal oblique abdominis (P=0.04) and the transverse abdominis (P=0.03) during gait, were significantly different between two groups. The external oblique abdominis and the multifidus electrical activities had not any significant differences between two groups (P>0.05).
Conclusion: It seems that electromyographic activities of some of core muscles in patients with patellofemoral pain syndrome in comparison with healthy subjects are different. However, there was no differences in electromyographic activities in some of the muscles around the knee between patients and healthy subjects.

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