en بيومکانيک ورزشی و شاخه‌های وابسته بدان Sport Biomechanics and its related branches مقاله اصیل Original Article <div style="text-align: justify;"><strong>Background. </strong>The heel-rise test is a measurement method that can evaluate the muscle endurance and muscle fatigue of the plantar flexor. On the other hand, there is a limit to quantifying the criteria because the evaluation method and criteria differ according to the measurement conditions.<br> <strong>Objectives.</strong> The purpose of this study is to compare the validity and reliability of the smartphone-based measurement application compared to the standardized surface electromyography (sEMG) for measuring muscle fatigue during the heel-rise test.<br> <strong>Methods. </strong>Fifty-seven adults in their 20s participated in the heel-rise test twice a week apart. The concurrent validity for muscle fatigue during the heel-rise test was measured using surface sEMG and &#39;Calf raise&#39; application, and analyzed through correlation analysis. The intra-rater reliability and inter-rater reliability of the &lsquo;Calf raise&rsquo; application were analyzed using ICC.<br> <strong>Results.</strong> The Pearson correlation coefficient between the &#39;Calf raise&#39; application and sEMG showed a statistically significant correlation of r=0.509 for both loss (%) and slope value (p<0.01). The &lsquo;Calf raise&rsquo; application showed high intra-rater reliability for loss (%) and slope value with ICC (2,1) = 0.986 and 0.987 respectively. It also showed high inter-rater reliability for loss (%) and slope value with ICC (2,1) =0.946 and 0.926.<br> <strong>Conclusion. </strong>The smartphone-based &#39;Calf rise&#39; application can be usefully used in clinical practice as an evaluation tool capable of not only quantitative evaluation of counting the number of heel-rise tests but also qualitative evaluation of muscle fatigue.</div> Electromyography, Heel-rise test, Muscle fatigue, Physical Examination, Equipment and Supplies 0 0 http://aassjournal.com/browse.php?a_code=A-11-1434-4&slc_lang=en&sid=1 Jun-Young Song tteepper@gmail.com 100319475328460013220 100319475328460013220 No Department of Physical Therapy, Graduate School, Daejeon University, Republic of Korea Sam-Ho Park samho15@naver.com 100319475328460013221 100319475328460013221 No Department of Rehabilitation & Assistive Technology, National Rehabilitation Research Institute, National Rehabilitation Center, Republic of Korea Byeong-Soo Kim qodtn4884@naver.com 100319475328460013222 100319475328460013222 No Department of Physical Therapy, Graduate School, Daejeon University, Republic of Korea Myung-Mo Lee mmlee@dju.kr 100319475328460013223 100319475328460013223 Yes Department of Physical Therapy, Daejeon University, Republic of Korea