1 Laboratory of Health Science, Graduate School of Life and Environmental Sciences, Kyoto Prefectural University, Kyoto, Japan 2 Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan.
The effect of exercise performed on the day of meal intake on postprandial triglyceride concentration, which is an independent risk factor for cardiovascular disease, is unclear. The present study investigated the effects of combined low-intensity exercise before and after a high-fat meal on serum triglyceride concentrations.
Ten healthy young subjects (four men and six women) consumed a relatively high-fat diet (fat energy ratio: men = 37.8%, women = 39.1%). In the exercise trials, subjects performed brisk walking (2.0 km) after light resistance exercise, either 60 min before or after meal intake. Blood samples were collected before and 2, 4, and 6 h after meal intake.
Exercise resulted in a reduction in the transient elevation in serum triglyceride concentration observed 2 h after meal intake in the postmeal trial (131 ± 67 mg·dL) when compared with the sedentary trial (172 ± 71 mg·dL; 95% confidence interval = 7.2-79.4, d = -1.00). This was also observed in the premeal trial, although the effect was less pronounced (148 ± 66 mg·dL; 95% confidence interval = -9.0 to 59.0, d = -0.57). The triglyceride concentrations in the VLDL, LDL, and HDL fractions, but not the chylomicron fraction, were also decreased 2 h after meal intake in both exercise trials, whereas the integrated triglyceride values after meal intake showed a greater decrease when exercise was performed after meal intake (d = -1.23) than before (d = -0.47). The concentration of serum growth hormone was drastically increased after exercise in both trials.
Low-intensity exercise on the day of meal intake, particular after intake, can prevent the elevation of postprandial triglyceride concentration in healthy young subjects.
[Show abstract][Hide abstract] ABSTRACT: To examine and compare systemic arterial stiffness responses in humans to acute continuous and interval low-intensity exercise.
Fifteen healthy young men (21.2 ± 0.4 years) underwent non-exercise control (CON), continuous exercise (CE), and interval exercise trial (IE) in a randomized balanced self-control crossover design. Systemic arterial stiffness (Cardio-ankle vascular index, CAVI) was measured at baseline (BL), immediately after (0 min) and 40 min after exercise in CE and IE trials, and at corresponding time points in CON trial. Subjects cycled continuously for 30 min at 35 % heart rate reserve after BL measurement in CE trial, whereas in IE trial, subjects cycled two bouts of 15-min separated by a 20-min rest at the same intensity.
There were no significant CAVI changes with time in CON trial (6.7 ± 0.1, 6.7 ± 0.1, 6.6 ± 0.1 at BL, 0 and 40 min, respectively). In CE trial, CAVI decreased immediately after exercise (0 min) and returned to baseline after 40 min of recovery (6.5 ± 0.1, 5.5 ± 0.2, 6.4 ± 0.1 at BL, 0 and 40 min, respectively). IE elicited similar CAVI reduction from 6.7 ± 0.1 at baseline to 5.6 ± 0.2 at 0 min: however, CAVI at 40 min remained significantly low compared to that of CON trial at corresponding time point (6.0 ± 0.1 vs. 6.6 ± 0.1, P < 0.001).
Both acute continuous and interval low-intensity exercise elicits transient improvement in systemic arterial stiffness in humans. Despite equivalent exercise intensity and duration, interval exercise resulted in improved arterial stiffness for longer duration.
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