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The effect of daily physical activity on the serum lipid level was examined. This study consisted of two parts, an epidemiological study and a laboratory study.In the epidemiological study, we investigated the relationship between serum lipids and energy expenditure in young adults females. Significant correlations were found between energy expenditure/ body weight and the levels of serum HDL-cholesterol and serum triglyceride, and atherogenic index.In the laboratory study, we examined the effects of exercise on the serum lipid level. Groups of subjects took part in the programs of physical activity of two different intensities for 6 weeks, and their serum lipid levels before and after these programs were compared. Exercise regimens of increasing intensity caused a significant mean increase in the serum HDL-cholesterol level. However , these regimens did not cause any significant change in serum total cholesterol and serum triglyceride values .These results suggest that doing even light exercise on a regular basis is effective in producing an optimum serum lipid pattern in young adult females .

We investigated the relationship between serum lactate dehydrogenase (LDH) activity and energy expenditure in young adults, evaluating their serum LDH activities in order to develop an index of energy expenditure. The results obtained were as follows. (1) There were significant correlations between the serum LDH activity and energy expenditure/day, energy expenditure/body weight/day and daily activity index in men. (2) There were significant correlations between the serum LDH activity and energy expenditure/day and daily activity index in women. (3) A group of men who 'rarely' exercised had lower levels of serum LDH activity than those who exercised 'sometimes' or 'usually', but little difference was noted between similar groups of women.