en فيزيولوژی ورزشی و شاخه‌های وابسته بدان Sport Physiology and its related branches مقاله اصیل Original Article <div style="text-align: justify;"><strong>Background. </strong>Previous high-intensity interval exercise (HIIE) studies on perceptual responses and health parameters in overweight and obese adults have mainly focused on laboratory-based settings, which could limit the effectiveness of the HIIE protocol in a real-world setting.<br> <strong>Objectives. </strong>We examined the changes in affective, enjoyment, cardiorespiratory fitness, body composition, and cortisol levels during outdoor-based HIIE over a 10-week intervention in overweight and obese adults.<br> <strong>Methods. </strong>Thirty-two physically inactive overweight or obese adults (men =12 and women =20; age 28.3&plusmn;4.9 years) performed an outdoor-based HIIE protocol across a 10-week intervention (3x/week, 30 sessions). Perceptual responses and changes in cortisol levels observed in sessions 1 (S1), 15 (S15), and 30 (S30) were analyzed using two-way repeated-measures analysis of variance. Health parameters were measured before and after the 10-week HIIE intervention.<br> <strong>Results. </strong>HIIE elicited lower affect responses across all selected work intervals (all P<0.02, all ES>1.19) in S1 compared to S15 and S30. HIIE participation also generated greater post-enjoyment from S1 to S30 (all P<0.04, all ES>43). HIIE also improved cardiorespiratory fitness and decreased body fat percentage following the 10-week intervention (all P<0.001, all ES>0.78). Finally, changes in affect responses induced by HIIE were negatively correlated with the changes in cortisol levels (all P<0.03, all r>-0.71).<br> <strong>Conclusion.</strong> The 10-week outdoor-based HIIE protocol improved perceptual responses, cardiorespiratory fitness, and body fat percentage in overweight and obese adults. Additionally, changes in cortisol levels may influence HIIE-induced affective responses across the 10-week intervention in overweight and obese adults.</div> Affective Valence, Enjoyment, Interval Exercise, Cortisol Hormone, Overweight, Obese 0 0 http://aassjournal.com/browse.php?a_code=A-11-1972-4&slc_lang=en&sid=1 Ruohan Zhang zhangruohan@student.usm.my 100319475328460016724 0009-0002-0969-1330 No Exercise and Sports Science Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia Adam Abdul Malik adamalik@usm.my 100319475328460016725 100319475328460016725 Yes Exercise and Sports Science Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia Hairul Anuar Hashim hairulkb@usm.my 100319475328460016726 100319475328460016726 No Exercise and Sports Science Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia