Effects of different intensities of endurance exercise in morning and evening on the lipid metabolism response

To study the effects of different exercise intensity performed at different exercise times on lipid metabolism response during prolonged exercise. nine young men performed endurance exercise at different exercise intensities (60%vo2max or fatmax) in the morning (9 am to 10 am) or evening (5 pm to 6 pm); blood samples were collected before exercise and immediately and one and two hours after exercise completion. expired gas was analyzed from the start of exercise until two hours after exercise completion. there were no significant changes in cate-cholamine (adrenaline and noradrenaline) and free fatty acid levels between morning and evening trials for each endurance exercise intensity. however,the morning and evening trials both exhibited significantly higher lipid oxidation at fatmax than that at 60%vo2max. these results suggest that exercise at fatmax offers greater lipid oxidation than that at 60%vo2max,regardless of exercise timing. © journal of sports science and medicine.