A Single Bout of Exercise Reduces Postprandial Lipemia but Has No Delayed Effect on Hemorheological Variables

High plasma triglyceride (TG) concentration in fasting state could cause hemorheological
abnormality, thus increasing the incidence of metabolic diseases. Exercise has been reported to
effectively reduce postprandial TG response. This study aimed to investigate whether a single bout
of pre-prandial exercise can affect lipemia and hemorheological variables after a high-fat meal.
Nine healthy young male subjects completed two experimental trials. The subjects walked for 1 h
at 50% maximal oxygen uptake (V̇ O2max) (the exercise, EX trial), or rested (the control, CON trial).
In the next morning, the subjects consumed a high-fat meal, and the postprandial lipemia and
hemorheological responses were monitored for 6 h. The results showed that postprandial plasma TG
concentrations were significantly lower in the EX trial compared to the CON trial. The postprandial
low-density lipoproteins (LDL) concentration declined in the first 2 h and then gradually returned
to the baseline level in both trials. The postprandial blood viscosity also decreased in the CON trial.
There was no significant difference in postprandial blood viscosity, red blood cell (RBC) deformation
index and aggregation degree between the trials. There was no significant correlation between
plasma TG concentration and blood viscosity. In conclusion, brisk walking effectively reduced
postprandial TG concentration, but has no significant impact on postprandial blood viscosity, RBC
deformation index and RBC aggregation index.