There was significant improvement in high-density #lipoprotein with weighted standardised mean difference and effect size=−1.06 (−1.83 to −0.30), p=0.006. We have also observed a significant reduction in low-density lipoprotein and total cholesterol with weighted standardised mean difference and effect size=−0.97 (−1.58 to −0.36), p=0.002, and = −0.78 (−1.34 to −0.22), p=0.007, respectively. There was a significant reduction in interleukin 6 (IL-6) using a fixed effect model with weighted standardised mean difference and effect size=−0.87 (−1.33 to −0.40), p=0.0003 and C reactive protein (CRP) with weighted standardised mean differences and effect size=−0.41 (−0.73 to −0.09), p=0.01.
Conclusion Chronic high-intensity endurance training improves healthy lipid profiles (increase high-density lipoprotein, decreased low-density lipoprotein and total cholesterol). And decreased #inflammatory markers (IL-6 and CRP) independent of age and sex and cannot be associated with an increased risk of developing cardiovascular disease