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Amy Olson, Nutrition


Elevated postprandial triglycerides contribute to the development of cardiovascular disease. Prior exercise is a well-established method to lower postprandial triglycerides; however, most exercise protocols involve prolonged aerobic exercise of sixty to ninety minutes which is not attainable by the general population. PURPOSE: The present study investigates the effect of high intensity interval training (HIIT) of twenty minutes and resistance training of thirty minutes on postprandial triglycerides. METHODS: Approval for this study was obtained from the Institutional Review Board of the University and signed informed consents were provided by all participants. Thirty healthy college-age students (5 males, 25 females) were recruited from nutrition and exercise science courses. All subjects completed the control, HIIT, and resistance protocols one week apart. Subjects performed the exercise protocols 12-16 hours prior to an oral fat tolerance test (milkshake, 1 g of fat per kg of body weight). Each exercise session was supervised; high intensity interval training consisted of four 30 second sprints with 4 minutes of walking recovery and the low-volume resistance training consisted of six machine-based lifts, 2 sets of 8 repetitions at 75% of one repetition maximum. Postprandial triglycerides were measured at baseline and three hours following consumption of the milkshake using the CardioChek PA blood analyzer. Data was analyzed using a three way repeated measures ANOVA statistical test. RESULTS: The means are as follows for each treatment and time point (baseline, and postprandial respectively): Control 107 +/- 49, 140 +/- 73 mg/dL; HIIT 93 +/- 34, 122 +/- 59 mg/dL; and Resistance 108 +/- 47, 144 +/- 64 mg/dL. A significant effect of treatment was noted indicating that HIIT TG values were lower than control (p=0.027); however, the treatment and time interaction was not significant (p=0.699). CONCLUSION: Twenty minutes of HIIT provided a sufficient energy deficit to significantly lower fasting and postprandial triglyceride values in a healthy, college-age population. Thirty minutes of low volume resistance training did not alter fasting or postprandial triglycerides in comparison to control values.