2013, Volume 5, Issue 3
Differences in bioelectrical activity of quadriceps muscle during various types of contraction
Bartlomiej Niespodzinski1, Malgorzata Lukowicz1, Jan Mieszkowski2
1Chair and Dep. of Laserotherapy and Physiotherapy, Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nikolaus Copernicus University
2Institute of Physical Culture, Dep. of Biomedical Fundamentals of Physical Culture, Kazimierz Wielki University in Bydgoszcz
Author for correspondence: Bartlomiej Niespodzinski; Chair and Dep. of Laserotherapy and Physiotherapy, Ludwik Rydygier Collegium Medicum in Bydgoszcz, Nikolaus Copernicus University; email: email@example.com
Background: The aim of the study was to estimate differences in bioelectrical activity between rectus femoris (RF) and vastus medialis (VM) muscles of each lower limb.
Material/Methods: 29 female and 18 male adult subjects participated in the study. Each subject performed the following quadriceps contractions with each lower limb: concentric, isometric, eccentric and 30-sec. long maximal voluntary isometric contraction. 3 parameters were obtained in surface electromyography (SEMG): mean RMS amplitude (RMS), mean percentage value of maximal voluntary contraction (%MVC) and mean frequency (MF).
Results: RF occurred to have a lower percentage activity (-28.43%) and absolute amplitude (-36.57%) value than VM during all three basic forms of contraction against gravity. Except the RMS values for concentric contraction, all the mentioned parameters were significantly different. In contrast, RF had a higher MF rate than VM. Differences were at the mean level of 22.57% for all activities.
Conclusions: There are no differences in SEMG of quadriceps muscle between both lower limbs. VM and RF differ from each other in RMS, %MVC and MF during all types of studied contractions.
Key words: electromyography, quadriceps muscle, muscle fatigue, muscle contraction