Effects of potassium alkali and calcium supplementation on bone turnover in postmenopausal women
Abstract
Potassium citrate may improve calcium balance by conferring an alkali load. Calcium supplementation slows postmenopausal bone loss by inhibiting PTH secretion. This study explores whether combined treatment with potassium citrate and calcium citrate is more effective than either agent alone in inhibiting bone loss. In a crossover study involving 18 postmenopausal women, the following treatments were compared: potassium citrate (4.3 g or 40 mmol/d), calcium citrate (800 mg or 20 mmol/d), combined treatment, and placebo. During the last 2 d of each 2-wk phase, serum and 24-h urine were collected for assessment of calcium metabolism, alkali load, and bone turnover markers. Compared with placebo, potassium citrate provided an alkali load and significantly decreased urinary calcium without changing serum PTH (sPTH) or bone turnover markers. Calcium citrate significantly increased absorbed calcium, marginally decreased sPTH, and significantly reduced bone resorption markers. Combined treatment retained key features of potassium citrate and calcium citrate. However, more alkali was delivered than with potassium citrate alone, and absorbed calcium did not differ from calcium citrate alone. Compared with placebo, combined treatment increased urinary calcium, marginally reduced sPTH, provided a clear alkali load, and reduced the bone resorption markers serum type I collagen C-telopeptide and urinary N-telopeptide by 20.4% (P < 0.0001) and 18.2% (P = 0.005), respectively. A significant…
How strong is the evidence?
Evidence Hub reads this as a randomized trial, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 18 participants or records.
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