Combined Light Exercise after Meal Intake Suppresses Postprandial Serum Triglyceride.
ABSTRACT PURPOSE: 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. METHODS: Ten healthy young subjects (4 men and 6 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) following light resistance exercise, either 60 min before or after meal intake. Blood samples were collected prior to, and 2, 4, and 6 h after meal intake. RESULTS: Exercise resulted in a reduction in the transient elevation in serum triglyceride concentration observed 2 h following meal intake in the post-meal trial (131 ± 67 mg/dL) when compared with the sedentary trial (172 ± 71 mg/dL; 95% CI = 7.2-79.4, d = -1.00). This was also observed in the pre-meal trial, although the effect was less pronounced (148 ± 66 mg/dL; 95% CI = -9.0-59.0, 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, while the integrated triglyceride values following 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. CONCLUSION: Low-intensity exercise on the day of meal intake, particular after intake, can prevent the elevation of postprandial triglyceride concentration in healthy young subjects.
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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.Arbeitsphysiologie 03/2014; 114(7). · 2.30 Impact Factor