en عمومى General پژوهشي Research <div style="text-align: justify;"><span style="font-size:14px;"><span style="font-family:Tahoma;"><strong>Purpose</strong>: Chronic low back pain (LBP) is one of the spine disorders and musculoskeletal problems and is one of the most common causes of people&rsquo;s disability. This study aims to compare the effects of McGill trunk stability exercises performed at home or in a supervised group setting on pain, disability, and trunk stability in middle-aged women with non-specific chronic LBP.<br> <strong>Methods</strong>: The current study is a cross-sectional comparative, quasi-experimental research with a pre-test and post-test design. The statistical sample included 30 middle-aged women aged 35 to 50 years with non-specific chronic LBP in Tehran City, Iran. Based on the inclusion and exclusion criteria, they were selected and randomly assigned into two groups, home-based exercises, and supervised group exercises. The subjects performed McGill trunk stability exercises for six weeks, three 45-minute sessions per week. Pain, disability, and endurance of spinal flexor and extensor muscles were measured using pain and Quebec questionnaires, a sit-up test, and a Biering-Sorenson test, before and after 6 weeks of training. To analyze the data, descriptive statistics, paired-samples t-test, and one-way analysis of covariance (ANCOVA) tests were used at the significant level of (P&le;0.05) using SPSS software, version 26.<br> <strong>Results</strong>: The results of the present study showed that the post-test scores compared to the pre-test in both groups have improved significantly (P&ge;0.05), and no significant difference was observed between the two groups with the control of the covariate variable (P<0.05) in the intensity of pain and endurance of the spinal flexor muscles in the post-test scores. However, a significant difference was observed in the endurance of the spinal extensor muscles in the post-test scores of the two groups in favor of the home-based exercise group (P&ge;0.05). Additionally, in the post-test scores, a significant difference was observed in functional disability level between the two groups (P&ge;0.05) so that the degree of disability in the home-based exercise group was higher than in the supervised group.<br> <strong>Conclusion</strong>: It seems that performing McGill exercises, either in supervised group or home-based settings, can reduce pain and disability, and improve the endurance of the spinal flexor and extensor muscles in middle-aged women with non-specific chronic LBP.</span></span></div> Trunk stability exercises, Non-specific low back pain (LBP), Middle-aged women 127 134 http://ptj.uswr.ac.ir/browse.php?a_code=A-10-564-1&slc_lang=en&sid=1 Parvin Baghani parvin13511@gmail.com 0000-0002-3137-6161 No Department of Department of Physical Education & Sport Sciences, Faculty of Literature, Humanities and Social Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran. Nader Naserpour na.naser1384@gmail.com 0000-0002-6905-8812 No Department of Sports Injuries and Corrective Exercises, Faculty of physical Education and Sport Sciences, Allameh Tabataba’i University, Tehran, Iran. Hashem Piri hpiry63@ gmail.com 0000-0002-3137-6161 Yes Department of Sports Injuries and Corrective Exercises, Faculty of physical Education and Sport Sciences, Allameh Tabataba’i University, Tehran, Iran.