fa آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research Abstract Objective: Comparison of global and local abdominal muscles thickness in chronic non-&lrm;specific low back pain patients with healthy controls in position of hook-lying over variant &lrm;stability surface utilizing diagnostic ultrasonography Methods and Materials: &lrm; &lrm;20 chronic non-specific low back pain male patients compared with a convenient sample of &lrm;age and gender matched healthy controls in a semi-experimental study.&lrm; Thickness of abdominal muscles was measured in end of inspiration and expiration phases &lrm;by B-mode linear ultrasound transducer in three different hook-lying positions over: 1- &lrm;stable surface, 2- foam roller under spine and finally 3- foam roller under spine and one &lrm;foot. Data were analyzed utilizing SPSS.&lrm; Results: &lrm; In healthy controls internal oblique and transverse abdomens muscles in expiration phase &lrm;revealed significant differences between three positions. P< 0.001 &lrm; In patients internal oblique and transverse abdomens muscles only revealed significant &lrm;differences between position one and two. P< 0.005&lrm; Conclusion: &lrm; In low back pain subjects internal oblique and transverse abdomens muscles were unable to &lrm;activate in more difficult position over unstable surface due to chronic pain process such as &lrm;functional deficiency and decrease number of muscle spindle and muscle fiber atrophy. &lrm; Abdominal muscles/ Non-specific chronic low back pain/ foam roller/ Diagnostic ‎ultrasonography.‎ 9 15 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-86-1&slc_lang=fa&sid=1 Mohsen Amiri محسن امیری m.amiri@uswr.ac.ir Yes USWR دانشگاه علوم بهزیستی و توانبخشی H Salmanderis هاشم سلمان دریس --- No ---