STUDY OF CALCIUM METABOLISM IN PREMENARCHE CHINESE GIRLS / 营养学报

ABSTRACT

Objective:To investigate the characteristics of calcium metabolism and identify the calcium intake that produces plateau retention in premenarche Chinese girls. Method:Forty-nine healthy premenarche Chinese girls (9-11.5 y) were recruited, and divided into four groups respectively receiving one of four different doses of calcium intakes for 6 d, 600 mg (usual diet),900 mg (containing 250 ml milk),1 200 mg (containing 250 ml milk and 750 mg CaCO3) and 1 500 mg calcium (250 ml milk and 1500 mg CaCO3) per day. Calium in 3-day urine and stool,and 3-d duplicated food samples were collected to assess the calcium equilibrium during the treatment period. Results: There were no significant differences in apparent calcium absorption among the four groups (55%, 53%, 52% and 52%). The relationship between calcium intake and calcium retention was fitted into a non-liner regression model which showed that the calcium retention was approaching the plateau when calcium intake reached 1100mg/d. Conclusion: The apparent calcium absorption was 53%?0.12% in Chinese premenarche girls with dietary calcium intakes ranged between 600 to 1500 mg/d. Calcium retention approached its plateau when calcium intake reached 1 100 mg/d in Chinese premenarche girls.