The relationship between diet, sleep, screen time, stress coping strategies with psychological strain and athlete burnout in Chinese competitive swimmers: a cross-sectional study

Background Athlete burnout significantly affects both athlete well-being and performance, potentially influenced by dietary patterns, sleep quality, screen time, and stress-coping strategies. However, the mechanistic interplay among these factors remains unclear. This study utilized a cross-sectional design to examine the relationships between daily health behaviors (including diet, sleep, and screen time), stress coping strategies, perceived stress and athlete burnout among Chinese competitive swimmers. Methods A comprehensive questionnaire was developed, encompassing demographic information, eating behavior (BEDA), sleeping behavior (ASSQ), screen time, stress coping strategies (CSCA), perceived psychological strain (APSQ), and athlete burnout (ABQ). This questionnaire was administered online and distributed to participating athletes through a snowball sampling method during the 2024 Shanghai Youth Swimming Competition to enhance the sample size. Results Data from 1,071 swimmers (477 females, 44.5%) revealed through Lasso regression analysis that perceived psychological strain emerged as the strongest predictor of athlete burnout (β = 5.07), followed by age (β = 2.19) and athlete level (β = 3.76). Sleep disturbances (ASSQ) demonstrated a weaker yet significant contribution to ABQ (β = 0.92). A temporal inflection point in age-related burnout trajectories was identified at 19 years. Conclusion The findings underscore the central role of psychological strain management in preventing athlete burnout, while highlighting the necessity to tailor psychological intervention strategies according to athletes' age and competitive level.