View clinical trials related to Bone Alteration.
Filter by:The primary objective of this randomized, double-blind, placebo controlled trial is to determine the efficacy of a once per day calcium (1000mg) and vitamin D (1000IU) fortified food product on bone turnover markers, including parathyroid hormone (PTH) and microarchitecture during Army basic military training (BCT). The investigators hypothesize that consumption of a once daily calcium and vitamin D fortified food product will stabilize PTH and contribute to improved bone microarchitecture compared to placebo. The results will determine the efficacy of daily supplementation with calcium and vitamin D on bone turnover markers as well as provide novel data regarding microarchitectural changes during BCT as assessed by high resolution peripheral computed tomography (HRpQCT) scanning.
The response to a daily 10 minute session of low-magnitude mechanical stimulation (LMMS) on bone in 100 postmenopausal women ages 45-65 years will be evaluated at baseline and 12 months using high-resolution magnetic resonance (MR) imaging. Subjects will be assigned to an active platform that produces vibrations or to a placebo platform that produces no vibrations. The investigators propose to evaluate the hypothesis that LMMS applied to postmenopausal women ages 45-65 improves the mechanical integrity of bone while lowering marrow adiposity. 1. The investigators will optimize an integrated imaging protocol for high-resolution structural MR imaging of the distal tibia and spectroscopic imaging-based quantification of bone marrow composition in the lumbar vertebrae. 2. The investigators will further develop and validate micro-finite-element (FE) analysis for quantitative assessment of trabecular and cortical bone stiffness and failure load from high-resolution MR images of the distal tibia. 3. The investigators will apply the methodology of Aims 1 and 2 (above) in a double-blinded, randomized, placebo-controlled study to a cohort of 100 healthy postmenopausal women in the age range of 45-65 years, studied at baseline and 12 months after having been subjected to 10 minutes daily of either 30 Hz/0.3g stimulation or placebo treatment, monitored rigorously via electronic feedback.