title: Electromyography response of the iliocostalis lumborum muscle during flexion, extension and rotation movements of the trunk in orthostatic and seated position.
abstract: The action of the column extensor muscles has been studied through in the electromyography in various corporal postures. We verified the electromyography responses of the iliocostalis lumborum muscle during various movements and positions. 12 individuals males, sedentary, between 36 and 52 years old (average 46.16), weighing an average of 79.66 kilos, and with an average height of 173.0 cm, all working as drivers were studied. Electromyography with six channels and surface electrodes was used. The electrodes were placed on the right side of the trunk in the direction of the third and fifth lumbar vertebrae ICL2 and ICL1 respectively). In orthostatic position, the flexion movement presented RMS 31.18 (+/- 5.73) in ICL1 and 58.10 (+/- 14.81) in ICL2; in extension the RMS 32.46 (+/- 9.17) in ICL1 and 55.31 (+/- 16.70) in ICL2; in homolateral rotation the RMS 30.05 (+/- 10.60) in ICL1 and 53.29 (+/- 19.70) in ICL2; in heterolateral rotation the RMS 24.76 (+/- 5.99) in ICL1 and 44.79 (+/- 15.26) in ICL2. In seated in a chair without a back, the flexion presented RMS 22.42 (+/- 2.89) in ICL1 and 43.39 (+/- 5.68) in ICL2; in extension the RMS 22.47 (+/- 1.95) in ICL1 and 41.28 (+/- 6.20) in ICL2; in homolateral rotation the RMS 24.10 (+/- 3.97) in ICL1 and 47.94 (+/- 5.80) in ICL2; in heterolateral rotation, the RMS 22.59 (+/- 1.95) in ICL1 and 43.15 (+/- 5.71) in ICL2. In the position seated on the ground, the flexion presented RMS 22.83 (+/- 3.00) in ICL1 and 50.99 (+/- 11.19) in ICL2; in extension the RMS 22.39 (+/- 3.22) in ICL1 and 46.44 (+/- 8.19) in ICL2. The results are expressed in RMS, indicating the participation of the iliocostalis lumborum muscle during the movements undertaken. The place identified as ICL2 presented action potential of greater amplitude than the place identified as ICL1 in all movements and positions.
authors.affiliation: Posture Laboratory, School of Physical Education, State University of Campinas-UNICAMP.
authors.forename: A C
authors.initials: AC
authors.lastname: de Moraes
authors.forename: A D P
authors.initials: AD
authors.lastname: Bankoff
mesh_terms: D000200:Action Potentials / Q000502:physiology; D000328:Adult; D004244:Dizziness / Q000503:physiopathology*; D004576:Electromyography; D006801:Humans; D007085:Ilium / Q000502:physiology*; D008161:Lumbosacral Region / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009068:Movement / Q000502:physiology*; D009119:Muscle Contraction / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*; D011187:Posture / Q000502:physiology*; D012016:Reference Values; D012399:Rotation; D013909:Thorax / Q000502:physiology*