RESUMEN
This longitudinal study aimed to assess the factors associated with motivation in 303 Brazilian medical students after a 30-month follow-up. Their demographics, study habits, sleep quality, motivation (Brazilian version of the Academic Motivation Scale-BAMS), learning approaches (R-SPQ-2F scale), and stressors (MSSF-Medical Student Stress Factor scale) were examined. We found an increase in amotivation and extrinsic motivation through external regulation (e.g., "I come to school to earn a degree") and a decrease in intrinsic motivation and extrinsic motivation through integrated regulation (e.g., "because studying broadens our horizons") in medical students after the 30-month follow-up. Students in earlier stages of medical training showed greater increases in amotivation. Factors such as the learning approach, hours spent studying, sex, stressors, studying just before examinations, and sleep problems were predictors of the different dimensions of motivation. Medical students' motivation changed negatively as medical training progressed.
