[Study on calcium absorption rate in premenarche Chinese girls aged 9 - 11.5 years].
OBJECTIVE
To investigate the characteristics of calcium metabolism in relation to different levels of dietary calcium intakes in premenarche Chinese girls.


METHODS
Forty-nine healthy premenarche girls of Han ethic (9 - 11.5 years) were recruited, and divided into four groups respectively, receiving four different doses of calcium intakes for 6 days, 600 mg (usual diet), 900 mg (containing 250 ml of milk), 1200 mg (containing 250ml of milk and 750 mg of calcium carbonate) and 1500mg calcium (250 ml of milk and 1500 mg of calcium carbonate) per day. A 3-day urine and stool, and a 3-d duplicated food samples were collected to assess the calcium excretion in urine and feces and input of the dietary calcium during the treatment period.


RESULTS
There were no significant differences in appearance calcium absorption among the four groups (55%, 53%, 52% and 52%). Urine calcium is correlated negatively with dietary protein and dietary phosphorus. And no correlation was found between dietary protein and calcium absorption.


CONCLUSIONS
The appearance calcium absorption was (53 +/- 0.12) % in Chinese premenarche girls with dietary calcium intakes ranged between 800 to 1600 mg/d, high dietary protein intakes increase urine calcium secrete.
Luo
Xiao-Lin
XL
Faculty of Nutrition, School of Public Health, SunYat-sen University, Guangzhou 510080, China.
Xiao
Xin-Cai
XC
Lai
Xiao-Hua
XH
Feng
Xiang
X
Su
Yixiang
Y
D002118:Calcium / Q000008:administration & dosage / Q000378:metabolism / Q000493:pharmacokinetics*; D002136:Calcium, Dietary / Q000008:administration & dosage*; D002648:Child; D002681:China; D004044:Dietary Proteins / Q000008:administration & dosage; D005260:Female; D006801:Humans; D007408:Intestinal Absorption / Q000502:physiology*; D017697:Premenopause
D002136:Calcium, Dietary; D004044:Dietary Proteins; D002118:Calcium