Skip to main content
فهرست مقالات

The investigation of median frequency changes in paraspinal muscles following fatigue


(5 صفحه - از 31 تا 35)

Objectives: There are two sub systems of paraspinal muscles, the global-mobilizing system and the local stabilizing system. The multifidus muscles are assigned to the local system and stabilize the joints. In contrast, the longissimus muscles are assigned to the global system and force exertion. This study aimed to investigate the median frequency changes in mobilizing and stabilizing muscles following fatigue. Method: A cross sectional study was designed. sEMG measurements were recorded from twenty participants following a fatigue protocol in B200 dynamometer. Participants performed dynamic trunk flexion-extension against a moderate resistance while standing in a static dynamometer until they could no longer performs the task because of fatigue. Results: Statistical analyses showed significant differences between median frequencies pre and post fatigue (P<0.05). Median frequency of the right and left multifudus muscles reduced from "99.12 and 93.2" to "86.55 and 85.85" respectively. Also Median frequency of the right and left longissimus reduced from "76.54 and 76.82" to "66.43 and 68.55" respectively. Conclusion: Median frequency shift toward low values following fatigue in global and local paraspinal muscles was seen. However, median frequency values for the local stabilizer muscle were higher than median frequency values for the global muscles.

خلاصه ماشینی:

"mu s cal se ke dto do dy na mi c tr u nk f l e x i on-e x te angsa i nosn t a cti vi ti we sr e r e cor de du s i nga n e i ght-cha nne5 l0 %of hi s MVC i nor de r to ge t f a mi l i wai r th the por ta bl e s u rf a c e l e ctr omy ogr a phy( s EMG) da ta pr oce du r ef osr the ne x t. me di a nfr e qu ey nsc hi ftot de te r mi nmeu s cl fea ti gu e In thi ss tu ,dya dy na mi c f a ti gu epr otocol wa s u s er da the r tha n me cha ni ca l i ndi ce is s tha t s pe ctr a l be ca u s ie nda i l yl i vi angcti vi ti meu s clu es suy a lus l e e l e ctr omy ogr a phi ic ndi ce csha nge conti nu ou s l y i nte r mi tte cnot ntr a cti ons a t l ow to mode r a te l eofve l fr om the u u na ti oonf the contr a cti ons ."

برای مشاهده محتوای مقاله لازم است وارد پایگاه شوید. در صورتی که عضو نیستید از قسمت عضویت اقدام فرمایید.