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Results for “ELECTROMYOGRAPHY”

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PubMed1995

Electromyography of spinal and abdominal muscles during garden raking with two rakes and rake handles.

Fifteen young normal subjects (4 males, 11 females) participated in the study. They were required to assume a staggered upright posture with left leg leading in front of a 75 x 75 cm raking box with 20-cm deep evenly distributed dry and wet sand and dirt. The subjects raked using a pulling and pushing action and a 60 cm stroke length at a self-selected optimum pace with a normal straight handled rake and with a rake with a modified handle. The handle modification consisted of three curvatures of 50, 60 and 50 degrees, with an effective rake length of 150 cm. While the subjects performed the raking their EMG was recorded from erectores spinae at L1 and L3 levels, external obliques and rectus abdominis bilaterally. The pulling activities with both rakes generated significantly different EMGs from pushing (p < 0.01). The normal rake generated marginally higher activity compared to the modified rake. However, in pushing the modified rake generated much higher EMG activity than the normal rake (p < 0.01). The medium being raked and the moisture in it also had a significant effect on EMG (p < 0.02). On the basis of the results of this study, the normal rake was concluded to be a better rake.

Abdominal Muscles↗
PubMed1970

Electromyography.

Explore the source record for details and available documents.

Diagnosis, Differential↗
PubMed1981

Detection of incipient effects of anticholinesterase insecticides in rats and humans by electromyography and cholinesterase assay.

Rats, fed low levels of diazinon (0.5 and 5.0 mg/kg) and parathion (0.1, 0.5 and 1.0 mg/kg) daily for 26 weeks, and agricultural workers chronically exposed to anticholinesterase insecticides, were monitored by electromyographic (EMG) and blood cholinesterase determinations. The two diazinon-fed and the highest parathion-fed groups of rats gained less weight, whereas the lowest parathion-fed group gained more weight than the control; rats fed 0.5 mg/kg parathion daily did not show any difference in weight gain when compared to the control. In addition, the two diazinon-fed groups of rats gained significantly less weight than the three parathion-fed groups. Both erythrocyte acetylcholinesterase (AChE) and plasma cholinesterase (ChE) activities were severely inhibited in the treated groups. However, parathion inhibited ChE much less than diazinon, and slight recovery of both enzymes was evident in the parathion-treated groups. No changes in amplitudes of EMGs were observed in the treated rats. Agricultural workers were examined monthly during one growing season. Although there was high variation in the data, EMG amplitudes and AChE levels were lower in the workers than in persons not exposed to pesticides; ChE levels were statistically different only once. These results have demonstrated that the rat is not suitable for investigating the use of EMG as a method for monitoring exposure to anticholinesterase insecticides, but that EMG (or AChE) may be used to monitor such exposures in humans.

Acetylcholinesterase↗
PubMed1998

Mandible position and head posture: electromyography of sternocleidomastoids.

A study was performed to evaluate relationships between mandible position, dynamics, muscle activity and head posture while swallowing by use of surface EMG and mandible kinesiograph on two population groups (118 pathologics and 31 controls). The study produced the following: 1. specific mandible dynamics with a very fast rising phase (0.3 sec) and longer phase of stabilization (1.5 sec); 2. more than 60% of the subjects presented deglutition at occlusion level, the others swallowing at a distance of 0.1-4.6 mm; 3. the whole muscle activity (temporals, masseters, digastrics, sternocleidomastoids) lasted 1.5 sec with no correlation of duration to age; 4. sternocleidomastoids fired at swallowing with an effort of one-half of temporals or masseters; 6. firing order presented a particular pattern: digastrics more often first, sternocleidomastoids more often last. No differences were found between the pathologics and controls. Findings suggest that the oral phase or mandible dynamic, and the stabilization phase or oropharyngeal phase of swallowing, has an individual role that is important in head postural equilibrium.

Adolescent↗
PubMed2006

Application of facial electromyography in computer mouse access for people with disabilities.

PURPOSE: This study develops a newly facial EMG human-computer interface for people with disabilities for controllng the movement of the cursor on a computer screen. METHOD: We access the computer cursor according to different facial muscle activity patterns. In order to exactly detect the muscle activity threshold, this study adopts continuous wavelet transformation to estimate the single motor unit action potentials dynamically. RESULT: The experiment indicates that the accuracy of using the facial mouse is greater than 80%, and this result indicates the feasibility of the proposed system. Moreover, the subject can improve performance of manipulation by repeated training. CONCLUSION: Compared with previous works, the proposed system achieves complete cursor function and provides an inexpensive solution. Although there are still some drawbacks in the facial EMG-based human-computer interface, the facial mouse can provide an alternative among other expensive and complicated assistive technologies.

Persons with Disabilities↗
PubMed1997

Multisite surface electromyography and complementary healing intervention: a comparative analysis.

A comparative analysis was conducted on a series of three experimental studies that examined the effect of various local and nonlocal (distant) complementary healing methods on multisite surface electromyographic (sEMG) and autonomic measures. The series concentrated sEMG electrode placement on specific neuromuscular paraspinal centers (cervical [C4], thoracic [T6], and lumbar [L3]), along with the frontalis region, due to the fact that these sites corresponded to the location of individual chakra centers as delineated in ancient Eastern medical and philosophical texts. It was hypothesized that the sEMG assessment procedure had the potential to provide objective, quantifiable correlates for complementary healing treatment effects, as well as assess the energy flow through the chakras during a healing treatment. The studies were the first of their kind to incorporate randomized, double-blind, placebo-controlled protocols in order to evaluate correlative neuromuscular multisite sEMG paraspinal measures with different complementary healing treatment interventions. Although the measurement protocols were similar between experiments, the results, demonstrated by the individual studies, varied. Whereas the overall findings of the series are encouraging because they indicate a potential objective scientific correlate to complementary healing treatment intervention, the results are considered preliminary in nature and appear to be linked to either the meditational experience of the subjects or dependent on the particular healer(s) used. Additional research is needed in order to establish the multisite sEMG assessment procedure as a reliable correlative measure for complementary healing treatment effects and to determine whether a consistent replicative treatment effect can be demonstrated independent of the specific subject population or practitioner(s) used.

Adolescent↗