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Acute High-Intensity Interval Cycling Improves Postprandial Lipid Metabolism

LEE, CHIA-LUN1; KUO, YU-HSUAN2; CHENG, CHING-FENG3

Medicine & Science in Sports & Exercise: August 2018 - Volume 50 - Issue 8 - p 1687–1696
doi: 10.1249/MSS.0000000000001613
APPLIED SCIENCES
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Purpose This study aimed to examine the effects of two exercise regimes on physiological and postprandial lipemic responses.

Methods Thirty-six active men (peak oxygen uptake [V˙O2peak], 46.5 ± 6.4 mL·kg−1·min−1) were randomly assigned to a high-intensity interval exercise (HIIE), involving 10 × 60 s cycling at 85% V˙O2peak interspersed with 120 s recovery; a moderate-intensity continuous exercise (MICE), involving 50 min continuous exercise at 65% V˙O2peak; and a nonexercise control (Con). In the next morning after evening exercising, fasting blood samples were obtained. Additional blood samples were obtained 1–4 h 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 MICE compared with those in HIIE (P = 0.00–0.03). During the 1- to 2-h postprandial periods, the fat oxidation rate increased by 24%–37% in HIIE that that in 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 HIIE than those in MICE and Con. No difference was observed in free fatty acid or the total areas under the curve of triglyceride and free fatty acid 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.

1Division of Physical and Health Education, Center for General Education, National Sun Yat-Sen University, Kaohsiung, TAIWAN;

2Department of Physical Education, National Taiwan Normal University, Taipei, TAIWAN; and

3Department of Athletic Performance, National Taiwan Normal University, Taipei, TAIWAN

Address for correspondence: Chia-Lun Lee, Ph.D., Division of Physical and Health Education, Center for General Education, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung City, Taiwan, ROC; E-mail: karenlee1129@gmail.com.

Submitted for publication October 2017.

Accepted for publication March 2018.

© 2018 American College of Sports Medicine