Acute High-Intensity Interval Cycling Improves Postprandial Lipid Metabolism

Purpose To examine the effects of 2 exercise regimes on physiological and postprandial lipemic responses. Methods Thirty-six active men (peak oxygen uptake (VO2peak): 46.5 ± 6.4 mL/kg/min) were randomly assigned to a high-intensity interval exercise (HIIE), involving 10 × 60 s cycling at 85% VO2peak interspersed with 120 s recovery; a moderate-intensity continuous exercise (MICE), involving 50 min continuous exercise at 65% VO2peak; and a nonexercise control (Con). In the next morning after evening exercising, fasting blood samples were obtained. Additional blood samples were obtained 1–4 hr after eating a given high-fat meal that based on participants' body mass. Carbohydrate and fat oxidation rates were measured before and after the meal. Results After exercise, glucose and insulin concentrations decreased by 33% and 70% in the MICE compared with those in the HIIE (P = 0.00–0.03). During the 1–2 hr postprandial periods, the fat oxidation rate increased by 24%–37% in the HIIE compared with that in the MICE and Con (P = 0.01–0.03); however, the carbohydrate oxidation rate was not significantly different among the conditions (P = 0.28). During the postprandial period, insulin (P = 0.02–0.04) and triglyceride (P = 0.02–0.03) concentrations were lower in the HIIE than in the MICE and Con. No difference was observed in free fatty acid (FFA) or the total areas under the curve of triglyceride and FFA among the conditions (P = 0.24–0.98). Conclusion Acute MICE improved glucose and insulin metabolism immediately after exercise. However, HIIE performed in the evening exerts more favorable effects than MICE for decreasing postprandial insulin and triglyceride levels and increasing fat oxidation in the next morning. Corresponding Author: Chia-Lun Lee, Division of Physical and Health Education, Center for General Education, National Sun Yat-sen University, Mailing address: NO. 21-2 Wang-Sheng-Ming Rd., Fengshan Dist, Kaohsiung City, Taiwan, R. O. C. Telephone: +886 920165693. Fax numbers: +886 77191435. e-mail: karenlee1129@gmail.com The authors declare no conflicts of interest or source of funding in this study. The results of the present study do not constitute endorsement by the American College of Sports Medicine. The results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation, and do not constitute. This study was supported by a grant from the Ministry of Science and Technology, Taiwan (MOST 105-2410-H-110-042). © 2018 American College of Sports Medicine

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