EVALUATION OF SERUM LACTATE-DEHYDROGENASE ACTIVITY FOR ESTIMATION OF ENERGY-EXPENDITURE IN HUMAN-SUBJECTS

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 expenditu re. The results obtained were as follows. (1) There were significant c orrelations 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 LHD activity and energy expenditure/day and daily activity index in women. (3) A gr oup of men who 'rarely' exercised had lower levels of serum LDH activi ty than those who exercised 'sometimes' or 'usually', but little diffe rence was noted between similar groups of women.