because there were no relevant changes in very low density lipoproteins or in high density lipoprotein ( hdl ) -cholesterol , the low plasma cholesterol levels at the high altitude resulted mainly from the reduction in low density lipoprotein ( ldl ) -cholesterol : the mean hdl/ldl cholesterol ratio changed from 0.39 at sea level to 0.63 at the end of the stay at 4800 m .
C0023824
low density lipoprotein
C0008377
cholesterol