%0 Journal Article
%T Surface electromyography assessment of muscle activation patterns while sitting down in young healthy women and patients with ankylosing spondylitis [Povrchov¨¦ elektromyografick¨¦ hodnocen¨ª svalov¨¦ aktivity ve zkou ce posazen¨ª u zdravych mladych  en a u pacient  s ankylozuj¨ªc¨ª spondylitidou]
%A Amr Mohamed Zaki Zaatar
%A Jaroslav Opavsky
%A Petr Uhl¨ª£¿
%J Acta Universitatis Palackianae Olomucensis : Gymnica
%D 2011
%I Palacky University
%X BACKGROUND: Muscle activation patterns depend on many factors. Surface electromyography (SEMG) can reveal these patterns in subjects of different ages and health states. We studied patterns of muscle activation in two groups of subjects - healthy young women (as a control group) and patients with ankylosing spondylitis. OBJECTIVE: The aim of this study was to register and compare muscle activation patterns while sitting down in these two groups in four situations with different positions of the lower and upper limbs. METHODS: Muscle activity was registered with the use of 8 channel surface polyelectromyography (Noraxon-Myosystem 1400A). We tested the following muscles bilaterally while the subjects were sitting down (tibialis anterior muscle, medial head of the gastrocnemius muscle, gluteus maximus muscle, erectores spinae muscles). The onset of each individual muscle's activity was determined by calculating the sum of the mean value of the SEMG baseline plus 10% of the maximum value of amplitude (peak). RESULTS: It was registered that the medial head of the gastrocnemius muscle and/or erectores spinae muscles were activated as the first ones in both groups of the subjects under study in most of the studied postural situations. We registered differences in timing (sequence of muscle activation) among various studied body and limb positions (P¨C, P+, PD¨C, and PN¨C). A great degree of variability in the sequence of muscle activation was revealed, depending on the positions of the upper and lower limbs. CONCLUSIONS: We did not find any unique patterns of muscle activation in either of the two groups under study. [VYCHODISKA:  asov¨¦ zapojov¨¢n¨ª (aktivace) sval  je z¨¢visl¨¦ na mnoha faktorech. Povrchov¨¢ polyelektromyografie zachycuje vzorce zapojov¨¢n¨ª sval  u proband  rozd¨ªln¨¦ho v¨§ku a zdravotn¨ªho stavu v r znych podm¨ªnk¨¢ch. C¨ªLE: C¨ªlem studie byla registrace a hodnocen¨ª po ad¨ª zapojov¨¢n¨ª sval  v pr b¨§hu sed¨¢n¨ª u t¨§chto dvou skupin  en ve  ty ech situac¨ªch s rozd¨ªlnymi pozicemi horn¨ªch i doln¨ªch kon etin. METODIKA: Studovali jsme po ad¨ª zapojov¨¢n¨ª sval  u dvou skupin  en ¨C zdravych mladych  en (jako kontroln¨ª skupiny) a pacient  s ankylozuj¨ªc¨ª spondylitidou. Aktivace vybranych sval  byla hodnocena povrchovou polyelektromyografi¨ª (Noraxon-MyoSystem 1400A). Elektrody byly um¨ªst¨§ny nad  ty i vybran¨¦ svaly bilater¨¢ln¨§ (m. tibialis anterior, medi¨¢ln¨ª hlava m. gastrocnemii, m. gluteus maximus a mm. erectores spinae). Pro zji t¨§n¨ª okam iku n¨¢stupu zapojen¨ª sval  (timing) jsme pou ¨ªvali klidovou hodnotu amplitudy EMG sign¨¢lu plus 10 % maxim¨¢ln¨ª hodnoty amplitudy (peak).
%K Poly-EMG
%K sitting down
%K healthy young women
%K ankylosing spondylitis
%U http://www.gymnica.upol.cz/index.php/gymnica/article/view/205