en ورزش، تمرین و سلامتی Exercise, Training and Health مقاله اصیل Original Article <div style="text-align: justify;"><strong>Background. </strong>The effects of exercise intensity on the rating of perceived exertion (RPE) have been widely studied. However, in most of these studies, the contraction intensities were provided in a randomized order.<br> <strong>Objectives. </strong>This study aimed to examine the influence of intensity order on RPE.<br> <strong>Methods.</strong> During the first period, three trials of isometric contractions were performed at three different target intensities in the following order: 25%, 50%, 75% of maximal voluntary contraction (MVC) in group A and in the reverse order: 75%, 50%, 25% of MVC in group B. Each group&rsquo;s intensity order provided during the first period was reversed during the second period. The RPE was measured at each target intensity.<br> <strong>Results. </strong>There was a significant difference in the perceived intensity at 75% of MVC between groups during the first period. The perceived intensity of 75% of MVC in group A during the second period and group B during the first period was significantly lower than the target intensity.<br> <strong>Conclusion. </strong>The order of exercise intensity affected the perceived exertion responses in this study. When establishing an exercise program consisting of varying intensities, practitioners should consider the order of intensity implementation.</div> Exercise, Hamstring Muscles, Isometric Contraction, Physical Exertion 0 0 http://aassjournal.com/browse.php?a_code=A-11-1385-2&slc_lang=en&sid=1 Wootaek Lim wootaeklimpt@wsu.ac.kr 100319475328460011723 100319475328460011723 Yes Department of Physical Therapy, Rehabilitation Science Faculty, Woosong University, Daejeon, Republic of Korea. Woosong Institute of Rehabilitation Science, Rehabilitation Science Faculty, Woosong University, Daejeon, Republic of Korea.