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Muscle power and physical activity are associated with bone strength in older men: The osteoporotic fractures in men study

Cousins, JM and Petit, MA and Paudel, ML and Taylor, BC and Hughes, JM and Cauley, JA and Zmuda, JM and Cawthon, PM and Ensrud, KE (2010) Muscle power and physical activity are associated with bone strength in older men: The osteoporotic fractures in men study. Bone, 47 (2). 205 - 211. ISSN 8756-3282

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The purpose of these analyses was to explore whether physical activity score, leg power or grip strength were associated with tibia and radius estimates of bone strength, cortical density, or total bone area. Peripheral quantitative computed tomography (pQCT) was used to compare tibial and radial bone volumetric density (vBMD, mg/cm3), total (ToA, mm2) and cortical (CoA, mm2) bone area, and estimates of bone compressive strength (bone strength index, BSI) and bending strength (polar strength strain index, SSIp) in a subset (n=1171) of men (- 65years) who participated in the multi-site Osteoporotic Fractures in Men (MrOS) study. Physical activity was assessed by questionnaire (PASE), leg power by Nottingham Power Rig, and grip strength by a hand-held Dynamometer. Participants were categorized into quartiles of PASE, grip strength or leg power. The model was adjusted for age, race, clinic, weight, and limb length. In the tibia, BSI (+7%) and SSIp (+4%) were highest in the most active physically quartile compared to the least active (p<0.05). At the 4% site of the tibia, men with the greatest leg power had both greater ToA (+5%, p<0.001) and BSI (+5.3%, p=0.086) compared to men with the least leg power. At the 66% site of the tibia, the men with the highest leg power, compared to the men with the lowest leg power, had greater ToA (+3%, p=0.045) SSIp (+5%, p=0.008). Similar results were found at both the distal and midshaft of the radius. The findings of this study suggest the importance of maintaining levels of physical activity and muscle strength in older men to prevent bone fragility. © 2010.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Cousins, JM
Petit, MA
Paudel, ML
Taylor, BC
Hughes, JM
Cauley, JAJCauley@edc.pitt.eduJCAULEY
Zmuda, JMZmudaJ@edc.pitt.eduEPIDJMZ
Cawthon, PM
Ensrud, KE
Date: 1 August 2010
Date Type: Publication
Journal or Publication Title: Bone
Volume: 47
Number: 2
Page Range: 205 - 211
DOI or Unique Handle: 10.1016/j.bone.2010.05.003
Schools and Programs: Graduate School of Public Health > Epidemiology
Refereed: Yes
ISSN: 8756-3282
Date Deposited: 01 Dec 2015 15:18
Last Modified: 22 Jun 2021 13:55


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