The effect of calcium supplementation on bone calcium balance and calcium and bone metabolism during load carriage in women: a randomised controlled crossover trial.
Charlotte V Coombs, Julie P Greeves, Christina D Young, Alice S Irving, Anton Eisenhauer, Ana Kolevica, Alexander Heuser, Jonathan C Y Tang, William D Fraser, Thomas J O'Leary
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引用次数: 0
Abstract
Calcium supplementation before exercise attenuates the decrease in serum calcium and increase in PTH and bone resorption. This study investigated the effect of calcium supplementation on calcium and bone metabolism during load carriage in women. Forty-eight women completed two load carriage sessions (load carriage 1 n = 48; load carriage 2 n = 40) (12.8 km in 120 min carrying 20 kg) 60 min after consuming either 1000 mg calcium (Calcium) or nothing (Control) in a randomised order. Pre- and post-exercise urine samples were analysed for calcium isotope ratio (δ44/42Ca). Fasted blood samples were taken before (pre-exercise), during (0, 20, 40, 60, 80, 100, 120 min), and after (+15, +30, +60, +90 min) exercise and analysed for markers of calcium and bone metabolism. There was no effect of load carriage or supplementation on urine δ44/42Ca (P≥.110). Serum δ44/42Ca did not change with load carriage in Control (P=.617) but increased in Calcium (P=.003) and was higher at 120 min in Calcium vs Control (P=.018). Ionised calcium (iCa) decreased from pre-exercise to all exercise time-points (P<.001); iCa was higher in Calcium than Control throughout (P<.001). PTH increased from pre-exercise to 120 min in Control (P<.001) but decreased from pre-exercise to all time-points in Calcium (P<.001). PTH was higher in Control than Calcium from 0 to +90 min (P<.001). βCTX decreased from pre-exercise to 20 to +15 min in Control (P≤.004); βCTX decreased from pre-exercise to 0 to +90 min in Calcium (P<.001). βCTX was lower in Calcium than Control from 20 to +90 min (P≤.036). A 1000 mg calcium supplement before load carriage promotes bone calcium balance and prevents disruptions to bone and calcium homeostasis.
期刊介绍：
The Journal of Bone and Mineral Research (JBMR) publishes highly impactful original manuscripts, reviews, and special articles on basic, translational and clinical investigations relevant to the musculoskeletal system and mineral metabolism. Specifically, the journal is interested in original research on the biology and physiology of skeletal tissues, interdisciplinary research spanning the musculoskeletal and other systems, including but not limited to immunology, hematology, energy metabolism, cancer biology, and neurology, and systems biology topics using large scale “-omics” approaches. The journal welcomes clinical research on the pathophysiology, treatment and prevention of osteoporosis and fractures, as well as sarcopenia, disorders of bone and mineral metabolism, and rare or genetically determined bone diseases.
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