Effects of High- and Low-Intensity Exercise on Postprandial Lipemia, Vascular Function, Oxygen Consumption and Energy Consumption After a Meal
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Postprandial lipemia (PPL) is an exaggerated elevation in the blood triglyceride levels during the hours that follow a meal. In the Western world, most of the population lives in an absorptive state for at least 16 hours a day; therefore, measuring one's blood triglyceride concentration after a meal maybe more accurate representation of the total triglyceride exposure to the arterial wall over a 24-hour period. Seven male participants between 25 and 55 years of age who did not regularly engage in physical activity or exercise performed three treadmill exercise sessions and one control session where heart rate, average oxygen consumption, excess post-energy expenditure, and exercise energy expenditure were measured. The exercise session was customized to each participant to expend 500 kcal at 70-80% maximal oxygen consumption to represent a high intensity session and 40-50% to represent a low-intensity session. During the fourth experimental condition, the participant exercised at higher intensity to expend 500 kcals again. Immediately after this session, the participants consumed a meal that had a caloric value equal to the difference in calories spent in the hours after the lower and higher intensity exercise sessions to determine if the additional energy expenditure after higher intensity exercise explains or accounts for the different responses in postprandial lipids and vascular function that occurs with higher intensity exercise. Heart rate, blood pressure and oxygen consumption were collected before, during, and after the exercise session, until the participants were back to their pre-exercise values. Once at pre-exercise values, a high-fat shake is given to the participant and blood was drawn at 0, 2, 4, and 6 hours. The data is used to compare the initial effects of high-intensity and low-intensity exercise on PPL, vascular function, oxygen consumption and energy consumption after a meal. Although intensities between exercise conditions were different, our preliminary findings indicate that there are no differences in oxygen consumption.