Jansson E, Kaijser L
Acta Physiol Scand. 1982 Jul;115(3):341-7. doi: 10.1111/j.1748-1716.1982.tb07087.x.
7 subjects were studied at rest and during a 6 min submaximal exercise (65% of VO2 max) on two occasions, the first preceded by a fat rich diet and the second by a carbohydrate rich diet. Oxygen uptake and respiratory exchange ratio (R) were measured at rest and heart rate both at rest and during exercise. Arterial-femoral venous differences for oxygen, glucose, lactate and beta-hydroxybutyrate and arterial concentrations of free fatty acids were measured at rest and during exercise. Changes in muscle glycogen (in 6 subjects) and lactate concentration were determined by biopsies from m. quadriceps femoris taken before and immediately after exercise. Muscle glycogen decreased less during exercise after the fat than after the carbohydrate diet in 5 of the 6 subjects, whereas blood glucose extraction by the exercising legs did not change with diet. Muscle lactate accumulation and release were smaller after the fat diet. In conclusion, the muscle glycogen utilization during a short-term exercise appeared to be lower after the fat than after the carbohydrate diet, but not the concomitant blood glucose extraction. These differences between diets were similar to those observed after a more prolonged work at the same load.
对7名受试者进行了两次研究，一次是在静息状态下，另一次是在进行6分钟次最大运动（最大摄氧量的65%）时，第一次运动前给予富含脂肪的饮食，第二次运动前给予富含碳水化合物的饮食。在静息状态下以及运动期间测量摄氧量、呼吸交换率（R）和心率。在静息状态下以及运动期间测量动脉-股静脉之间的氧、葡萄糖、乳酸和β-羟基丁酸差异以及游离脂肪酸的动脉浓度。通过对股四头肌在运动前和运动后立即进行活检，测定6名受试者的肌肉糖原和乳酸浓度变化。6名受试者中有5名在摄入脂肪后运动期间肌肉糖原的减少量低于摄入碳水化合物饮食后，而运动腿部对血糖的摄取量并未因饮食而改变。高脂肪饮食后肌肉乳酸的积累和释放较少。总之，在短期运动期间，摄入脂肪后肌肉糖原的利用率似乎低于摄入碳水化合物饮食后，但伴随的血糖摄取情况并非如此。这些饮食之间的差异与在相同负荷下进行更长时间运动后观察到的差异相似。
