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Paper Information

Journal:   TEHRAN UNIVERSITY MEDICAL JOURNAL (TUMJ)   2006 , Volume 63 , Number 12; Page(s) 1032 To 1038.
 
Paper: 

THE EFFECT OF BICEPS BRACHII MUSCLE CONTRACTION FORCE IN 45 AND 90 DEGREES OF ELBOW FLEXION ON FREQUENCY SPECTRUM OF ELECTROMYOGRAPHY SIGNAL

 
 
Author(s):  TALEBIAN S., ALIAEI GHOLAM REZA, BAGHERI HOSSEIN, HADIAN MOHAMMAD REZA, HEMAD N., AKBARI MOHAMMAD
 
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Abstract: 
Background: Daily activities have dynamic muscle contractions, which produce non-stationary myoelectric signals in electromyographic recording. When muscle force changes, some variations occur in number of motor unit, sites of nervous system, value and kinds of motor units. These factors affect on shape of motor unit action potential (MUAP). Therefore can produce significance changes in electromyography evaluations. The propose of this study is to determine ability of spectrum frequency values, in detection of changes following muscle force variations.
Materials and Methods: Twenty healthy subjects participated in this study. Electromyography was recorded during maximum isometric contraction of biceps bracheii muscle in two angles of 45 and 90 degrees of elbow flexion, against dynamometer. Median and mean frequency of muscle activities, muscle force estimation and muscle torque were measured and analyzed.
Results: Median and mean frequency in 45 angle in comparison to 90 angle reduced significantly (p< 0.05). There was significance difference between torque that produced from two different angles. So as in 45 degree increase of torque appeared (P< 0.05). There was negative correlation between torque in 90 angle with mean and median frequencies respectively (r = - 0.77, P = 0.01), (r=- 0.69, P = 0.03).
Conclusion: Muscle geometry has high effect on torque and frequency spectrum in maximal contraction. Following variations of length and joint angle, mean and median of frequency spectrum will be change, and therefore these two variables can produce valid estimation of muscle performance.
 
Keyword(s): ELECTROMYOGRAPHY, MUSCLE TORQUE, MEAN FREQUENCY, MEDIAN FREQUENCY, BICEPS BRACHII
 
References: 
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