Premium
Urinary calcium losses during high‐impact and resistance exercise training
Author(s) -
Nemoseck Tricia,
Kern Mark
Publication year - 2008
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.22.1_supplement.685.11
Subject(s) - calcium , medicine , urinary system , urinary calcium , excretion , urine , physical exercise , endocrinology , physiology , zoology , physical therapy , biology
Mechanisms responsible for exercise‐induced bone mineralization and potential effects of activity on dietary calcium requirements are not completely understood. We investigated the effects of a high‐impact and resistance training exercise program versus a period of restricted physical activity on urinary calcium excretion. Ten healthy, moderately active, men (27.0 ± 5.8 years) participated in a 3‐week randomized, cross‐over study. Subjects were assigned to complete 7‐day periods of a) daily exercise (EX) including high‐impact and resistance training activities and b) exercise restriction with a one‐week washout period between trials. During both phases, subjects consumed four, 8‐ounce servings of low‐fat (1%) milk daily and avoided other dietary and supplemental sources of calcium. Urine was collected throughout the final 72 hours of each study phase. Urinary calcium and sodium excretions (mean ± SEM) were 14.7 ± 5.2 % and 15.8 ± 3.0 % lower (P<0.05), respectively, during the EX phase. This occurred despite subjects consuming more (~300 mg/d; P<0.05) sodium during the EX phase. These data suggest that healthy, moderately active men excrete significantly less urinary calcium during a period of exercise training versus inactivity. Therefore, renal conservation of calcium may be partially responsible for improved bone mineralization that has been observed during periods of greater physical activity.