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      Muscle to bone relationship in the forearm at midlife

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      Lorbergs_Amanda_Liga_2009.pdf (2.189Mb)
      Date
      2009
      Author
      Lorbergs, Amanda Liga
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      Larger and stronger muscles are positively associated with bone strength in the growing skeleton; however, less is known about the role of muscle properties on bone strength later in life. The primary objective of this study was to examine the relationship between muscle cross sectional area (MCSA), muscle force and rate of torque development (RTD) with bone strength indices (bone strength index (BSI) and strength strain index (SSI)) in the radius of healthy middle-aged adults. All bone and muscle measurements were determined in the non-dominant forearm in a sample of 40 healthy adults (23 men, 17 women: mean age 49.5, SD 2.3 yrs). Peripheral quantitative computer tomography (pQCT) was used to scan the distal and shaft sites of the radius bone in the forearm. MCSA was determined from the forearm shaft scan. Forearm muscle force was measured by hand grip dynamometry and RTD was obtained from isometric wrist flexion from an isokinetic dynamometry protocol. Hierarchical regression analyses were used to identify whether muscle properties (MCSA, grip force, and RTD) independently predicted radius bone strength indices (BSI and SSI), after adjusting for the confounders of sex, height and weight. Steps of the regression models that included sex, height, weight and a muscle property explained between 66% and 71% of variance in distal radius BSI and between 74% and 78% variance of estimated bone strength (SSI) at the shaft site (all steps p
      Degree
      Master of Science (M.Sc.)
      Department
      College of Kinesiology
      Program
      College of Kinesiology
      Supervisor
      Kontulainen, Saija
      Committee
      Baxter-Jones, Adam; Farthing, Jon; Dal Bello-Haas, Vanina
      Copyright Date
      2009
      URI
      http://hdl.handle.net/10388/etd-01082010-153904
      Subject
      adulthood
      peripheral quantitative computed tomography (pQCT)
      muscle strength
      bone strength
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