Kinetics of Urinary Ca Excretion

Some groups have used a methodology whereby Ca absorption was indirectly assessed by following the kinetics of urinary Ca excretion after a controlled Ca intake.87-90 In three such studies, the authors measured total urinary Ca 878890 whereas in another study they added 44Ca to the test food and measured total Ca and the ratio 44Ca/43Ca to assess more precisely if the urinary Ca had indeed originated from the Ca in food.89 In such studies, the fasted volunteers were given a breakfast containing a dose of Ca combined with either oligofructose (3 g/d or a ratio Ca/oligofructose of 10:1),8789 inulin (15 g/d),88 or inulin (5 g/8 oz) as part of a complex beverage,90 and urine was collected at 2 h intervals for up to 8, 12, or even 72 h.

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