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Weight-loss-associated changes in bone mineral density and bone turnover after partial weight regain with or without aerobic exercise in obese women.
Hinton, PS, Rector, RS, Linden, MA, Warner, SO, Dellsperger, KC, Chockalingam, A, Whaley-Connell, AT, Liu, Y, Thomas, TR
European journal of clinical nutrition. 2012;(5):606-12
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Abstract
BACKGROUND/OBJECTIVES Moderate, long-term weight loss results in the loss of bone mass in overweight or obese premenopausal women. However, whether these changes persist during weight maintenance or regain remains to be determined. SUBJECTS/METHODS Overweight or obese (body mass index: 25.8-42.5 kg/m(2)) women (n=40) with at least two risk factors for the metabolic syndrome participated in this 12-month study that examined the effects of prescribed weight loss and regain, with or without exercise, on bone turnover and on bone mineral density (BMD) in a subset of participants (n=24). During the first 6 month, participants lost ≈ 10% of their initial body weight via energy restriction and supervised aerobic exercise. Following weight loss, participants were randomly assigned to either an exercise or a no exercise treatment for the regain (+50% of weight lost) phase. A one-way (time) repeated measures one-factor analysis of variance (RMANOVA) tested the effects of weight loss on BMD and bone turnover, and a two-way RMANOVA (time, exercise) was used to examine the effects of exercise during weight regain. RESULTS Hip (P=0.007) and lumbar spine (P=0.05) BMD decreased with weight loss, and remained reduced after weight regain with or without exercise. Likewise, the weight-loss-associated increases in osteocalcin (P<0.001) and C-terminal peptide of type I collagen (P<0.001) persisted following weight regain, independent of exercise. CONCLUSIONS The results of the present study, which is the first to examine changes in bone mass and turnover during carefully controlled weight regain, suggest that weight-loss-induced perturbations in bone mass and turnover persist after partial weight regain, regardless of whether regular weight-bearing aerobic exercise was continued.
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Long-term cinacalcet HCl treatment improved bone metabolism in Japanese hemodialysis patients with secondary hyperparathyroidism.
Shigematsu, T, Akizawa, T, Uchida, E, Tsukamoto, Y, Iwasaki, M, Koshikawa, S, ,
American journal of nephrology. 2009;(3):230-6
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Abstract
BACKGROUND/AIMS: Few clinical trials conducted with cinacalcet have thoroughly addressed its effects of on bone metabolism. We assessed the effects of cinacalcet on bone markers in Japanese hemodialysis (HD) patients with secondary hyperparathyroidism (SHPT). METHODS 200 Japanese HD patients with intact PTH (iPTH) levels > or = 300 pg/ml were enrolled. The dose of cinacalcet was titrated from 25 up to 100 mg/day to achieve iPTH levels < or = 250 pg/ml for 52 weeks. RESULTS At the end of the study visit, 57.8% of patients (115/199) had achieved iPTH levels < or = 250 pg/ml. Serum Ca, phosphorus (P) and Ca x P levels decreased rapidly and were maintained throughout the study. At week 52, all bone metabolic markers levels had decreased significantly from baseline. Although bone resorption markers gradually decreased throughout the study period, bone alkaline phosphatase significantly increased during the first 4 weeks and then gradually decreased. CONCLUSIONS The time courses of changes in bone markers after cinacalcet treatment resembled those observed after surgical parathyroidectomy (PTx), sometimes described as the hungry bone syndrome, indicating that cinacalcet treatment induces a rapid recovery in bone response to calcium. In addition, long-term efficacy and safety of cinacalcet were also observed in Japanese patients undertaking long-term hemodialysis (167.0 +/- 81.4 months).
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[Oral Biofilms and bone resorption].
Ebisu, S, Noiri, Y
Clinical calcium. 2007;(2):179-84
Abstract
A lot of oral diseases, including marginal periodontitis, are infectious diseases that caused by the oral biofilm-forming bacteria for example dental biofilm (dental plaque). The oral biofilm is paid to attention as a risk factor of the systemic disease such as metabolic syndrome, osteoporosis, aspiration pneumonia, diabetics, and the infective endocarditises. It had been shown that 500 bacterial species inhabited with symbiosis and antagonization within the oral biofilm and communication among bacteria is essential for initial colonization and subsequent biofilm formation on human teeth and oral mucosa. The feature and the realities of the biofilm to cause the bone absorption were outlined in this manuscript and speculated how the biofilm-forming bacteria approach to the alveolar bone, although it was difficult to clarify the whole contents of human oral biofilm that presented a various aspect.