Impact of the Discontinuance of Regular Exercise on Serum Lipids / 한국역학회지

ABSTRACT

To estimate the impact the discontinuance of regular exercise on serum lipids, we selected 90 healthy young adults who were recruited and completed their training course as scheduled(5-week basic physical training and 4-week indoor education) during the period February 1995 to April 1995. Serum lipids, height, and weight were measured three times(Time I before training, Time II after 5-week training, Time III after 4-week detraining). Ninety study subjects were classified as underweight, normal and overweight based on the criteria of Katsura equation. Of 17 underweight subjects, two were weight maintainers and 15 were weight gainers. There was no significant change in serum lipids after detraining among 15 weight gainers. Of 64 normal weight subjects, three were weight losers, 12 weight maintainers and 49 were weight gainers. There was significant increase in total cholesterol after detraining among 12 weight maintainers(P<0.01). In addition to this, there was also significant increase in total cholesterol(P<0. 01), LDL- cholesterol(P<0. 01) and HDL-cholesterol(P<0.05) after detraining among 49 weight gainers. This might be due to the harmful effect of detraining except HDL-cholesterol change. Of nine overweight subjects, only one was weight loser and eight were weight maintainers. There was significant increase in HDL-cholesterol after detraining among 7 weight maintainers (P<0.05). However, there were no significant changes in total cholesterol, triglyceride, LDL-cholesterol and MI index. The harmful effect of detraining was not observed in overweight subjects. In conclusion, the harmful effect of detraining was observed in weight maintainers and weight gainers among normal weight subjects after regular exercise.