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Physical Activity and Bone Density in WomenA mathematical model of bone density regulation as a function of the daily tissue "effective" stress has been derived. Using the model, the influence of daily activity in the form of a daily loading history has been related to bone density of the calcaneus. The theory incorporates a stress exponent m to account for differences in the importance of magnitude and number of load cycles experienced during daily activity. We have derived a parameter from the model, the "Bone Density Index" (BDI). We have developed a method of collecting daily habitual loading histories using an insole force sensor interfaced to a portable digital data logger carried in a fanny pack. Our goal for this study was to determine a stress exponent, m, relating GRFz history to Calcaneal Bone Mineral Density (CBMD).
Document ID
Document Type
Preprint (Draft being sent to journal)
Bowley, Susan M. (NASA Ames Research Center Moffett Field, CA United States)
Whalen, R. T. (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
August 20, 2013
Publication Date
January 1, 2000
Subject Category
Aerospace Medicine
Funding Number(s)
PROJECT: RTOP 199-26-12-35
Distribution Limits
Work of the US Gov. Public Use Permitted.