en حرکت‌شناسی و آسيب‌های ورزشی Kinesiology and Sport Injuries مقاله اصیل Original Article <div style="text-align: justify;"><strong>Background. </strong>This study investigated the effects of short-duration high-intensity simulation of soccer fatigue on the dynamic balance and isokinetic strength of the lower limbs in youth soccer players.<br> <strong>Methods. </strong>Thirty-nine youth soccer players completed a high-intensity fatigue simulation in 5-min. The participants performed tests on dynamic balance and isokinetic strength before the fatigue simulation (PRE), immediately after simulation (POST5), and 20 min (POST20) and 35 min (POST35) after simulation. Dynamic balance was measured using the Y-Balance test for both legs in the anterior, posteromedial (PM), and posterolateral (PL) directions. The muscle strength of the lower limb was measured using the maximal isokinetic contraction of the dominant leg only.<br> <strong>Results. </strong>Dynamic balance was significantly reduced after stimulation in all directions for both legs (P<0.005). Significant reduction in the eccentric hamstring, concentric hamstring, and concentric quadriceps peak torques were also observed (P<0.05). However, no significant reductions were found in the functional hamstring/quadriceps ratio and conventional hamstring/quadriceps ratio (P>0.05).<br> <strong>Conclusion. </strong>Fatigue influences dynamic balance, hamstrings, and quadriceps strength which may have implications for higher risk of knee injury in youth players.</div> Muscle Fatigue, Torque, Balance, Injury 0 0 http://aassjournal.com/browse.php?a_code=A-11-1724-1&slc_lang=en&sid=1 Saiful Adli Bukry saiful_adli@uitm.edu.my 100319475328460011012 100319475328460011012 No Center for Physiotherapy Studies, Faculty of Health Sciences, Universiti Teknologi MARA, Puncak Alam Campus, 42300 Puncak Alam, Selangor, Malaysia Mohammed Raja Firhad Raja Azidin firhad@uitm.edu.my 100319475328460011013 100319475328460011013 No Clinical and Rehabilitation Exercise Research Group, Faculty of Health Sciences, Universiti Teknologi MARA, Puncak Alam Campus, 42300 Puncak Alam, Selangor, Malaysia Maria Justine maria205@uitm.edu.my 100319475328460011014 100319475328460011014 No Center for Physiotherapy Studies, Faculty of Health Sciences, Universiti Teknologi MARA, Puncak Alam Campus, 42300 Puncak Alam, Selangor, Malaysia Haidzir Manaf haidzir5894@uitm.edu.my 100319475328460011015 100319475328460011015 Yes Center for Physiotherapy Studies, Faculty of Health Sciences, Universiti Teknologi MARA, Puncak Alam Campus, 42300 Puncak Alam, Selangor, Malaysia