en آسیب شناسی ورزشی و حرکات اصلاحی Sport injury and corrective exercises پژوهشي Research <div style="text-align: justify;"><strong>Purpose</strong>: This study aims to assess the effects of an 8-week core stability training on the kinematics and kinetics of trunk flexion and extension motions in patients with chronic non-specific low back pain (CNSLBP).&nbsp;<br> <strong>Methods</strong>: A total of 30 CNSLBP patients with the age range of 25 to 45 years were randomly divided into 2 equally sized groups. The subjects were identified through clinical examination. Before and after the training, tests were applied to assess peak 3-dimensional hip joint moments, peak negative and positive hip joint powers, and lumbopelvic coupling angles during trunk flexion and extension motions. The first group underwent an 8-week core stability training program, including the specific exercise of the deep muscles of abdominal along with the lumbar multifidus co-activation. After the 8-week program, the post-test stage was performed similarly to the pre-test.<br> <strong>Results</strong>: The main effects of &ldquo;time&rdquo; (P=0.029, f=0.84) and &ldquo;time-by-group&rdquo; interactions (P=0.03, f=0.16) for hip abductor moments and internal rotator moment (P=0.03, f=0.87) were significant. A trend toward the statistically significant main effect of &ldquo;time&rdquo; was found for the coupling angle during the flexion phase (P<0.05, f=1.88), extension phase (P=0.02, f=0.93), and &ldquo;time&times;group&rdquo; interaction during the flexion (P<0.05, f=1.96), extension (P=0.01, f=0.96) phases.&nbsp;<br> <strong>Conclusion</strong>: Core stability training has the potential to improve kinematics and kinetics during trunk flexion and extension motions in patients with CNSLBP.&nbsp;</div> <div> <div><div class="msocomtxt" id="_com_2" language="JavaScript" on<illegal tag>mouseout="msoCommentHide('_com_2')" on<illegal tag>mouseover="msoCommentShow('_anchor_2','_com_2')"></div></div> </div> Core stability training, Kinematics, and kinetics variables, Flexion and extension task   55 66 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-551-1&slc_lang=en&sid=1 Vahid Mohammadi v.mohammadi70@gmail.com 0000-0002-2524-2482 Yes Department of Health and Sports Medicine, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran. Amir Letafatkar 0000-0002-5612-8340 No Department of Health and Sports Medicine, Faculty of Physical Education and Sport Sciences, Kharazmi University, Tehran, Iran. Amir Ali Jafarnezhadgero 0000-0002-2739-4340 No Department of Physical Education and Sport Science, Faculty of Education and Psychology, University of Mohaghegh Ardabili, Ardabil, Iran.