Abstract:
The oxidation of low-density-lipoprotein (LDL)has been suggested as a key event in atherogenesis. Paradoxically, exercise, which imposis an oxidative stress, is an important deterrent of cardiovascular disease. The influence of endurance training on serum lipids, lipoproteins and oxidized LDL was investigated in 23 untrained male people (mean age: 23,9 +/- 2,5 years; VO2max: 3445 +/- 533 ml/kg). The group was trained 3 times a week for half an hour for eight weeks. Eleven people were designated as the control group (mean age: 25,0 +/-2,5 years; VO2max: 3210 +/- 383 ml/kg).
Performance parameters and blood samples were determined before and after the training. The maximal relative oxygen uptake (RVO2max)changes significantly (p<0,01) for the pre- to post-training for the trained group with no significant changes for the controls (46,4 +/- 5,0 to 50,9 +/- 6,7 ml*kg-1*min-1). After the training period there was no significant change in the median serum lipid- and lipoprotein concentration.
The susceptibility to undergo oxidation was determined by the lag-time and conjugated diens formation. After the training there was no significant change (lag-time: 43,9 +/- 5,6 to 44,9 +/- 6,4 min; konjugated diens: 0,79 +/- 0,16 to 0,8 +/- 0,16).
In conclusion, the results from our study demonstrate that endurance training of eight weeks of moderate intensity has a significant effect on the performance parameters, but does not significantly influence on serum lipds, lipoproteinprofile and oxidized LDL.