Differences in masseter activity in patients with and without self-reported rheumatoid arthritis using surface electromyography: A cross-sectional study (original) (raw)
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Quantitative EMG in inflammatory myopathy
Muscle & Nerve, 1990
Fifty-four quantitative electromyographic (EMG) studies were made in 37 patients with inflammatory myopathy (IM) at different points in their clinical course and treatment. All studies were performed in the biceps brachii which varied in clinical strength. Motor unit action potentials (MUAPs) in 45 studies and EMG interference pattern (IP) in 48 studies were recorded using a concentric needle electrode. Macroelectromyographic (Macro-EMG) MUAPs were recorded from 10 patients in 14 studies. MUAP analysis revealed a myopathic pattern (decreased duration andlor area: amplitude ratio) in 69% of studies. IP analysis was more sensitive than MUAP analysis, demonstrating a myopathic pattern in 83% of studies. Macro-EMG MUAP amplitudes were reduced in two studies, minimally increased in one study and normal in the remainder; in 6 (40%) studies, fiber density was slightly increased. Thus, reinnervation does not seem to play an important role in motor unit remodeling in IM.
Physical Therapy, 2019
Background Neuromuscular electrical stimulation (NMES) is a viable intervention for improving impaired muscle function in individuals with rheumatoid arthritis (RA). However, there is limited evidence about the dose-response relationship between NMES and muscle function in these individuals. Objective The objectives of this study were to investigate the dose-response relationship between NMES and muscle function in individuals with RA and to establish the minimal NMES training intensity for promoting improvements. Design This study was a secondary analysis of data obtained before and after an NMES intervention in a randomized study. Methods The study took place at a research clinic. Only adults diagnosed with RA were included. The intervention consisted of 36 NMES treatment sessions for the quadriceps muscles over 16 weeks. Muscle function was measured before and after the intervention; quadriceps cross-sectional area and muscle quality were assessed using computed tomography, and s...
Physical Therapy, 2007
Background and Purpose: Muscle atrophy is common in patients with rheumatoid arthritis (RA). Although neuromuscular electrical stimulation (NMES) is a viable treatment for muscle atrophy, there is no evidence about the use of NMES in patients with RA. The purposes of this multiple-patient case report are: (1) to describe the use of NMES applied to the quadriceps femoris muscles in conjunction with an exercise program in patients with RA; (2) to report on patient tolerance and changes in lean muscle mass, quadriceps femoris muscle strength (force-producing capacity), and physical function; and (3) to explore how changes in muscle mass relate to changes in quadriceps femoris muscle strength, measures of physical function, and patient adherence. Case Description: Seven patients with RA (median age=61 years, range=39–80 years) underwent 16 weeks of NMES and volitional exercises. Lean muscle mass and strength of the quadriceps femoris muscle and physical function were measured before and...
Arthritis Research & Therapy
Background: We aimed to explore pressure pain sensitivity and the function of segmental and plurisegmental exerciseinduced hypoalgesia (EIH) in persons with rheumatoid arthritis (RA) compared with healthy control subjects (HC). Methods: Forty-six participants with RA (43 female, 3 male) and 20 HC (16 female, 4 male) participated in the study. Pressure pain thresholds, suprathreshold pressure pain at rest, and segmental and plurisegmental EIH during standardised submaximal contractions were assessed by algometry. Assessments of EIH were made by performing algometry alternately at the contracting (30% of the individual maximum) right m. quadriceps and the resting left m. deltoideus. Results: Participants with RA had higher sensitivity to pressure pain (RA, 318 kPa; HC, 487 kPa; p < 0.001), suprathreshold pressure pain 4/10 (RA, 433 kPa; HC, 638 kPa; p = 0.001) and suprathreshold pressure pain 7/10 (RA, 620 kPa; HC, 851 kPa; p = 0.002) than HC. Segmental EIH (RA, 0.99 vs 1.27; p < 0.001; HC, 0.89 vs 1.10; p = 0.016) and plurisegmental EIH (RA, 0.95 vs 1.36; p < 0.001; HC, 0.87 vs 1.31; p < 0.001) increased significantly during static muscle contraction in both groups alike (p > 0.05). Conclusions: Our results indicate a generally increased pain sensitivity but normal function of EIH among persons with RA and offer one possible explanation for pain reduction observed in this group of patients following clinical exercise programmes.
Muscle & Nerve, 2008
Surface electromyography (sEMG) measures myoelectrical signals recorded from sensors placed on the skin surface. The non-invasive nature of sEMG makes it a potentially useful technology for studying diseases of muscle and nerve. Reviews published by the American Association of Neuromuscular and Electrodiagnostic Medicine (AANEM) and the Therapeutics and Technology Assessment Subcommittee of the American Academy of Neurology (AAN), covering 1964-1994 and 1952-1998, respectively, concluded that sEMG adds no clinical utility over conventional needle EMG (nEMG) for the diagnosis of neuromuscular disease. The AANEM sEMG task force reevaluated the diagnostic utility and added value of this technology for the study of neuromuscular disease based on a contemporary review of relevant literature published between January 1994 and February 2006. The present review concludes that sEMG may be useful to detect the presence of neuromuscular disease (level C rating, class III data), but there are insufficient data to support its utility for distinguishing between neuropathic and myopathic conditions or for the diagnosis of specific neuromuscular diseases. sEMG may be useful for additional study of fatigue associated with post-poliomyelitis syndrome and electromechanical function in myotonic dystrophy (level C rating, class III data).
Reumatizam, 2021
Novi parametri stiska šake u bolesNika s reumatoidNim artritisom temeljeNi Na elektrodiNamičkim mjereNjima-pilot evaluacijska studija ines doko vajdić 1 , amir dubravić 2 , ivan michieli 2 , branka medved rogina 2 , simeon grazio 1 1 university department of rheumatology, physical and rehabilitation medicine, sestre milosrdnice university Hospital center, school of medicine, Zagreb, croatia / klinika za reumatologiju, fizikalnu medicinu i rehabilitaciju kliničkoga bolničkog centra sestre milosrdnice, medicinski fakultet u Zagrebu, Zagreb, Hrvatska 2 ruđer bošković institute, Zagreb, croatia / institut ruđer bošković, Zagreb, Hrvatska corresponding author / Adresa autora za dopisivanje: Dr. sc. Ines Doko Vajdić, dr. med. university department of rheumatology, physical and rehabilitation medicine / klinika za reumatologiju, fizikalnu medicinu i rehabilitaciju sestre milosrdnice university Hospital center / klinički bolnički centar sestre milosrdnice vinogradska cesta 29, 10000 Zagreb croatia / Hrvatska phone /
FRI0557 Thermographic analysis of hands and wrists of rheumatoid arthritis patients
FRIDAY, 15 JUNE 2018, 2018
FRI0555-Table 1. Mean SWV and differences in the examined muscles between myositis patients and controls Muscle Shear wave velocity (m/s) Mean difference (95% CI) Difference percentage Significance (p value) Healthy Myositis Vastus lateralis 1.74 1.42 À0.32 (0.19, 0.46) 18.4% <0.001* Rectus femoris 1.77 1.53 À0.24 (0.12, 0.34) 13.6% <0.001* Vastus medialis 1.66 1.45 À0.21 (0.06, 0.35) 12.7% <0.001* Vastus intermedius 1.89 1.60 À0.29 (0.11, 0.47) 15.3% <0.001* Biceps brachii 1.94 1.79 À0.15 (-0.01, 0.30) 7.7% 0.088 Biceps femoris 1.73 1.38 À0.35 (0.24, 0.46) 20.2% <0.001* Semitendinosus 1.72 1.45 À0.27 (0.09, 0.43) 15.7% <0.001* Semimembranosus 1.75 1.38 À0.37 (0.28, 0.45) 21.1% <0.001* Conclusions: Muscle elasticity in myositis patients has been shown to be 21% lower in comparison to healthy participants and seems to moderately correlate with disease activity, muscle strength and function. To our knowledge, this is the first study to show that shear wave elastography can detect changes in muscle elasticity in myositis patients. Further validation is required to evaluate the value of this novel ultrasound technology as an imaging biomarker for myositis.
Clinical and electrophysiological evaluation of peripheral neuropathy in rheumatoid arthritis
Journal of the Peripheral Nervous System, 2006
Objective-To evaluate dysphagia at the oropharyngeal stage of swallowing and to determine the pathophysiological mechanisms of dysphagia in patients with myasthenia gravis. Methods-Fifteen patients with myasthenia gravis with dysphagia and 10 patients without dysphagia were investigated by a combined electrophysiological and mechanical method described previously. Laryngeal movements were detected by a piezoelectric transducer and the related submental EMG (SM-EMG) and sometimes the EMG of cricopharyngeal muscle of the upper esophageal sphincter (CP-EMG) were recorded during dry or wet swallowing. The results of these electrophysiological variables were compared with those of normal age matched control subjects. Results-In patients with myasthenia gravis with dysphagia, it was found that the time necessary for the larynx to remain in its superior position during swallowing and swallowing variability in successive swallows increased significantly compared with normal subjects and with patients with myasthenia gravis without dysphagia. The total duration of SM-EMG activity was also prolonged in both groups but more severely in the dysphagic patients. Electromyographic activity of the CP sphincter was found to be normal in the dysphagic patients investigated. All the patients with myasthenia gravis with dysphagia had pathological dysphagia limits (<20 ml water) whereas other patients except two, were within normal limits. Conclusions-Because the electrophysiological variables related to oropharyngeal swallowing were prolonged even in patients with myasthenia gravis without dysphagia, it is concluded that the submental and laryngeal elevators are involved subclinically in myasthenia gravis and, because of compensating mechanisms, the patient may not be dysphagic. As the CP-EMG behaviour was found to be normal, a coordination disorder between normal CP sphincter muscle and the aVected striated muscles of the laryngeal elevators may be one of the reasons for dysphagia in myasthenia gravis. This method also made it possible to investigate the myasthenic involvement in the laryngeal elevators that cannot be evalu-ated by other electrophysiological methods in myasthenia gravis. (J Neurol Neurosurg Psychiatry 1998;65:848-856)
Inter- and intraobserver variation in the interpretation of electromyographic tests
Electroencephalography and Clinical Neurophysiology/Electromyography and Motor Control, 1995
This study was undertaken with the aim of evaluating inter-and intraobserver variation on the pathophysiological interpretation of individual electromyographic (EMG) tests on muscles and nerve segments. Seven physicians from 6 European EMG laboratories independently interpreted 81 EMG studies comprising 735 muscle tests and 726 tests on nerve segments. Pathophysiological conclusions were inferred from findings of these tests without considering clinical information. For most combinations of findings, both the inter-and intraobserver variations on the interpretation were low, suggesting that common criteria for pathophysiological interpretations were used and that these were used consistently. For some combinations of findings, however, there was disagreement on whether these indicated specific or unspecific pathophysiological changes. In particular disagreement on whether findings indicated demyelination may be of clinical significance. A large part of the intraobserver variation may be explained by a change towards more cautious interpretations during the study for most of the physicians. It is concluded that there is a need to seek for consensus on the pathophysiological interpretation of individual findings and for incentives to ensure consistency in interpretations. The fact that experienced physicians changed their ways to interpret findings during the study suggests that agreement may be improved globally.