The effect of muscle tissue from rats trained by swimming on the extra
cellular degradation of triglyceride (TG) rich particles has been stud
ied in vitro. During incubation, there is a progressive decline of the
TG concentration in the incubation medium. At the end of the incubati
on period (90 min), a significantly reduction in the TG levels (p < 0.
05) is associated with a significant increase in the high-density lipo
protein (HDL) cholesterol level (p < 0.005). There are no significant
changes in total cholesterol levels. The correlation of the TG decline
with the HDL-cholesterol increase is significant (r = 0.695, p < 0.05
, n = 25). The experimental model used here could be of great interest
for the in vitro study of factors affecting lipid levels in plasma.