title: Calcium absorptive consistency.
abstract: Calcium absorption efficiency was measured two or three times each in 74 premenopausal and 142 postmenopausal women under conditions predicted to alter absorptive performance. A woman's absorptive consistency was evaluated across differing loads, differing intervals, and substances of differing intrinsic absorbability. In all these circumstances there was a statistically significant correlation between a woman's absorption under differing test situations accounting for up to 60% of the variance typically found in cross-sectional studies. For example, when the same substance but at differing load levels was tested three times over an 8 week period, various coefficients of correlation ranged from +0.773 to +0.849 (P less than 0.001). Even over intervals as long as 5 years correlation of absorption fraction within individuals remained significant (r = +0.487, P less than 0.001).
authors: Center for Hard Tissue Research, Creighton University, Omaha, NE.
authors: R P
authors: RP
authors: Heaney
authors: C M
authors: CM
authors: Weaver
authors: M L
authors: ML
authors: Fitzsimmons
authors: R R
authors: RR
authors: Recker
mesh_terms: D000328:Adult; D002136:Calcium, Dietary / Q000008:administration & dosage / Q000097:blood / Q000493:pharmacokinetics*; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D008875:Middle Aged; D012016:Reference Values
chemical_list: D002136:Calcium, Dietary