The efficacy of morning versus evening exercise for weight loss: A randomized controlled trial

Objective The aim of this study was to investigate the influence of morning versus evening exercise on weight loss, cardiometabolic health, and components of energy balance. Methods A total of 100 inactive adults with overweight or obesity were randomized to morning exercise (AMEx; 06:00–09:00), evening exercise (PMEx; 16:00–19:00), or wait‐list control (CON). AMEx and PMEx were prescribed 250 min·wk−1 of self‐paced aerobic exercise for 12 weeks. Anthropometry and body composition, physical activity, and dietary intake were assessed at baseline, 6 weeks, and 12 weeks. Cardiorespiratory fitness (V̇O2peak), resting metabolic rate, and blood markers were assessed at baseline and 12 weeks. Body composition and V̇O2peak were also measured at 3‐ and 6‐month follow‐up. Results AMEx and PMEx lost weight during the intervention (mean [SD], AMEx, −2.7 [2.5] kg, p