Effects of Different Intensities of Endurance Exercise in Morning and Evening on the Lipid Metabolism Response

Hyeon-Ki Kim; Karina Ando; Hiroki Tabata; Masayuki Konishi; Masaki Takahashi; Mio Nishimaki; Mi Xiang; Shizuo Sakamoto

Effects of Different Intensities of Endurance Exercise in Morning and Evening on the Lipid Metabolism Response

J Sports Sci Med. 2016 Aug 5;15(3):467-476. eCollection 2016 Sep.

Authors

Hyeon-Ki Kim¹, Karina Ando², Hiroki Tabata², Masayuki Konishi³, Masaki Takahashi⁴, Mio Nishimaki², Mi Xiang², Shizuo Sakamoto³

Affiliations

¹ Graduate School of Sport Sciences, Waseda University, Saitama, Japan; Research Fellow of the Japan Society for the Promotion of Science, Tokyo, Japan.
² Graduate School of Sport Sciences, Waseda University , Saitama, Japan.
³ Faculty of Sport Sciences, Waseda University , Saitama, Japan.
⁴ Faculty of Science and Engineering, Waseda University , Tokyo, Japan.

PMID: 27803625
PMCID: PMC4974859

Abstract

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.

Keywords: Exercise timing; Fatmax; catecholamines; exercise intensity; lipid oxidation; prolonged exercise.