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Influence of habitual diet and physical activity on determining calcium retention in adolescent boys
Author(s) -
Hill Kathleen M.,
Braun Michelle,
Martin Berdine R.,
McCabe Linda,
McCabe George P.,
Kern Mark,
Navalta James W.,
Sedlock Darlene A.,
Peacock Munro,
Weaver Connie M.
Publication year - 2007
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fasebj.21.5.a358-b
Subject(s) - vitamin d and neurology , physical activity , crossover study , medicine , calcium , endocrinology , physiology , zoology , physical therapy , biology , alternative medicine , pathology , placebo
We recently reported the relationship between Ca intake and Ca retention in adolescent boys (Braun AJCN 84 : , 2006). We previously reported that Ca intake explained 21.5 % of the variability in Ca retention and circulating hormones and biomarkers of bone turnover explained an additional 25.0 % (Braun FASEB J 18 : , 2004). Here we evaluated the influence of physical activity during the metabolic periods, habitual physical activity, and habitual Ca and vitamin D intake on Ca retention in that same study. Thirty‐one white boys were studied during two 3‐week metabolic periods in a randomized, crossover design. All procedures were approved by Institutional Review Boards. Subjects consumed a controlled diet and Ca intakes ranged from 663 to 2004 mg/day, which was manipulated by fortified beverage. Habitual Ca and vitamin D intake was estimated from 6‐day diet records. Physical activity was assessed by questionnaire and VO 2max was estimated from gas exchange data during cycle ergometry in a subset of boys ( n = 19). Lifestyle choices other than calcium intake accounted for relatively small additional amounts of variation in Ca retention in adolescent boys.