title: Circadian rhythm with acrophase at night for urinary excretion of calcium and magnesium in childhood: population-based data of the cimitile study in southern Italy.
abstract: A population-based study on daily and overnight urine excretion of Ca and Mg was performed in 220 children aged 4-15 years living in Cimitile, Campania Region, Southern Italy. The Ca/creatinine and the Mg/creatinine ratio in overnight urine were significantly higher than in daily urine (p less than 0.01). This finding was also confirmed in hypercalciuric children. The Mg/Ca ratio in the general population was identical in daily and overnight urine while in the hypercalciuric group Mg/Ca in overnight urine was significantly higher (p less than 0.01) than in daily urine. The data point to the existence of a circadian rhythm with a peak at night for urine Ca and Mg excretion in children living in Cimitile and studied while attending to their everyday life.
authors.affiliation: Department of Pediatrics, 1st Faculty of Medicine, University of Naples, Italy.
authors.forename: N G
authors.initials: NG
authors.lastname: DeSanto
authors.forename: B
authors.initials: B
authors.lastname: DiIorio
authors.forename: G
authors.initials: G
authors.lastname: Capasso
authors.forename: G
authors.initials: G
authors.lastname: Capodicasa
authors.forename: D R
authors.initials: DR
authors.lastname: Giordano
authors.forename: M
authors.initials: M
authors.lastname: Aulisio
authors.forename: C
authors.initials: C
authors.lastname: Paduano
authors.forename: J
authors.initials: J
authors.lastname: Stamler
mesh_terms: D000293:Adolescent; D002118:Calcium / Q000652:urine*; D002648:Child; D002675:Child, Preschool; D002940:Circadian Rhythm; D003404:Creatinine / Q000652:urine; D005260:Female; D006801:Humans; D007558:Italy; D008274:Magnesium / Q000652:urine*; D008297:Male; D012737:Sex Factors
chemical_list: D003404:Creatinine; D008274:Magnesium; D002118:Calcium