Bustamante Sánchez, ÁlvaroTorre Gómez, Sergio de laClemente Suárez, Vicente Javier2026-07-312026-07-312025Bustamante Sánchez, Á., De La Torre Gómez, S., & Clemente Suárez, V. J. (2025). Differences in the psychophysiological response between normal weight and overweight young recreational athletes in strength training. Journal of Human Sport and Exercise, 21(1), 1. https://doi.org/10.55860/d69210371988-5202https://hdl.handle.net/11268/17351Strength training is widely recognized for its benefits in young recreational athletes, yet limited research has explored its effects on heart rate variability (HRV) across different body compositions. This study aimed to analysethe autonomic modulation differences between normal-weight and overweight recreational athletes during strength training. Methods: A total of 63 male recreational athletes (23.8±3.6 years, 174.9±8.2 cm, 70.8±11.7 kg) were categorized into normal-weight (Body Mass Index < 25) (N=38) and overweight (Body Mass Index > 25) (N=25) groups. Participants performed three sets of 10 repetitions at 70% 1RM for both squats and bench press. HRV parameters, including RMSSD, SDNN, and PNN50, were measured before, during, and after training. Additionally, heart rate (HR), rate of perceivedexertion (RPE), and strength levels were assessed. Results: HR significantly increased during training in both groups, with a greater post-exercise HR elevation observed in the normal-weight group. HRV parameters (RMSSD, SDNN, PNN50) decreased significantly during training in the normal-weight group, indicating greater autonomic stress. RPE increased post-exercise in both groups, while the overweight group demonstrated higher baseline strength levels. Conclusion: Strength training induced acute autonomic stress in both groups, with greater HRV suppression observed in normal-weight athletes, suggesting a higher physiological demand. In contrast, overweight athletes displayed better baseline strength levels and potentially greater adaptability to strength training. These findings highlight the need for individualized training prescriptions based on body composition to optimize performance andrecovery in recreational athletesengAttribution-NonCommercial-ShareAlike 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-sa/4.0/Entrenamiento de FuerzaSobrepesoFrecuencia Cardíacajournal article10.55860/d6921037open accessMedicina deportivaAtletaSistema cardiovascularGoal 3: Ensure healthy lives and promote well-being for all at all ages