Acute morning fasted exercise may create a greater negative 24-hr energy balance than the same exercise performed after a meal, but research exploring fasted evening exercise is limited. This study assessed the effects of 7-hr fasting before evening exercise on energy intake, metabolism, and performance. Sixteen healthy males and females (n = 8 each) completed two randomized, counterbalanced trials. Participants consumed a standardized breakfast (08:30) and lunch (11:30). Two hours before exercise (16:30), participants consumed a meal (543 ± 86 kcal; FED) or remained fasted (FAST). Exercise involved 30-min cycling (∼60% VO_2peak) and a 15-min performance test (∼85% VO_2peak; 18:30). Ad libitum energy intake was assessed 15 min postexercise. Subjective appetite was measured throughout. Energy intake was 99 ± 162 kcal greater postexercise (p < .05), but 443 ± 128 kcal lower over the day (p < .001) in FAST. Appetite was elevated between the preexercise meal and ad libitum meal in FAST (p < .001), with no further differences (p ≥ .458). Fat oxidation was greater (+3.25 ± 1.99 g), and carbohydrate oxidation was lower (−9.16 ± 5.80 g) during exercise in FAST (p < .001). Exercise performance was 3.8% lower in FAST (153 ± 57 kJ vs. 159 ± 58 kJ, p < .05), with preexercise motivation, energy, readiness, and postexercise enjoyment also lower in FAST (p < .01). Fasted evening exercise reduced net energy intake and increased fat oxidation compared to exercise performed 2 hr after a meal. However, fasting also reduced voluntary performance, motivation, and exercise enjoyment. Future studies are needed to examine the long-term effects of this intervention as a weight management strategy.

与饭后进行的相同运动相比，急性早晨禁食运动可能会产生更大的 24 小时负能量平衡，但探索夜间禁食运动的研究是有限的。这项研究评估了晚间运动前 7 小时禁食对能量摄入、新陈代谢和表现的影响。十六名健康男性和女性（每人n  = 8）完成了两项随机、平衡试验。参与者食用标准化早餐（08:30）和午餐（11:30）。运动前两小时 (16:30)，参与者进餐 (543 ± 86 kcal；FED) 或保持禁食 (FAST)。锻炼包括 30 分钟骑自行车（~60% V O _2peak）和 15 分钟性能测试（~85% V O _2peak; 18:30）。运动后 15 分钟评估随意摄入的能量。全程测量主观食欲。在 FAST 中，运动后的能量摄入量增加了 99 ± 162 kcal ( p  < .05)，但当天减少了 443 ± 128 kcal ( p  < .001)。在 FAST 中，运动前餐和自由进餐之间的食欲有所提高 ( p  < .001)，没有进一步的差异 ( p  ≥ .458)。FAST 运动期间脂肪氧化更大 (+3.25 ± 1.99 g)，碳水化合物氧化更低 (-9.16 ± 5.80 g) ( p  < .001)。FAST 中的运动表现降低了 3.8%（153 ± 57 kJ 对比 159 ± 58 kJ，p  < .05），FAST 中的运动前动机、能量、准备和运动后享受也较低（p  < .01）。与饭后 2 小时进行的运动相比，夜间禁食运动减少了净能量摄入并增加了脂肪氧化。然而，禁食也会降低自愿表现、动力和运动乐趣。未来的研究需要检查这种干预作为体重管理策略的长期效果。