Abstract
Acute high-density lipoprotein-cholesterol (HDL) changes were
determined in 18 healthy college aged-men completing two-counterbalanced
running trials at different exercise intensities: trial 1 at 70 %
lactate threshold (LT) (372.5 ± 28.9 kcal); trial 2
at LT intensity (365.9 ± 75.9 kcal). For each
trial, blood samples were collected at pre-exercise (baseline), 15 min
post-exercise (15 m PE) and 24 hours post-exercise (24 h).
Serum samples were analyzed for HDL/HDL2/HDL3
subfraction, low density lipoprotein (LDL), very low density lipoprotein
(VLDL), total cholesterol (TC), free cholesterol (FC), cholesterol ester, and
triglycerides (TG). In addition, capillary blood samples were collected for
analysis of blood lactate concentrations during incremental test to determine
LT. All samples were corrected for plasma volume changes and compared to
pre-exercise (baseline). In assessing the lipid and lipoprotein variables, the
significant increase in HDL (p < 0.05) at the 24 h was
due to the increase in both HDL2 and HDL3. The increase
in 15 m PE TC at the LT intensity occurred while the decreases in
24 h TG and VLDL concentrations at the LT intensity occurred at
different time periods, respectively. These decreases in the concentrations of
TG and VLDL were significantly different, contributing to change in 24 h
HDL concentration. No significant difference was determined in changes of HDL
over time ratios of FC/CE and HDL2/HDL3. Therefore, the
significant increase in 24 h HDL at LT intensity was potentially due to
increases in both HDL2 and HDL3 subfractions even though
24 h FC was increased significantly. Exercise at LT intensity might
favourably alter the lipid profile as demonstrated in 24 h HDL
concentration in combination with decreases in TG and VLDL at 24 h
post-exercise. Consequently, the LT intensity might appear to be the threshold
intensity of acute aerobic exercise (expending 350 kcal) necessary to
promote a significant increase in HDL.
Key words
Blood lipids - cardiovascular - running
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J. Ransone, Ph. D. Professor
College of Education
Southwest Texas State University · San Marcos Texas 78666
· USA ·
Phone: (+1) 512 744 9439
Email: ransone@swt.edu