Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
©Journal of Sports Science and Medicine (2016) 15, 467 - 476

Research article
Effects of Different Intensities of Endurance Exercise in Morning and Evening on the Lipid Metabolism Response
Hyeon-Ki Kim1,2, , Karina Ando1, Hiroki Tabata1, Masayuki Konishi3, Masaki Takahashi4, Mio Nishimaki1, Mi Xiang1, Shizuo Sakamoto3
Author Information
1 Graduate School of Sport Sciences, Waseda University, Saitama, Japan
2 Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan
3 Faculty of Sport Sciences, Waseda University, Saitama, Japan
4 Faculty of Science and Engineering, Waseda University, Tokyo, Japan

Hyeon-Ki Kim
‚úČ Graduate School of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, 359-1192, Japan
Publish Date
Received: 21-12-2016
Accepted: 14-06-2016
Published (online): 05-08-2016
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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 catecholamine (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.

Key words: Exercise timing, prolonged exercise, exercise intensity, Fatmax, lipid oxidation, catecholamines

           Key Points
  • It is important to consider exercise intensity when evaluating lipid oxidation.
  • Few studies have investigated the effects of the intensity of exercise on lipid oxidation in the morning and evening.
  • Fatmax exhibited greater total lipid oxidation compared to that of 60%VO2max when energy expenditure was equated, but time of day did not affect lipid oxidation in prolonged exercise.
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