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EFFECTS OF BODY WEIGHT AND COMPOSITION ON BONE MINERAL CONTENT

A Wong
SP Shultz

Abstract

A. Wong1, S. P. Shultz1,2

1Seattle University, Seattle, WA; 2Monmouth University, West Long Branch, NJ

Increased bodyweight (BW) is considered a protective condition for bone mineral content (BMC) in individuals with obesity due to the absorption of larger forces. However, little research has considered the effects on BMC based on stratified weight class and by body composition variables including lean mass (LM) and fat mass (FM). PURPOSE: To determine the relationship between BMC and BW normalized by LM and FM when stratified by weight class. METHODS: A dataset was amalgamated using DXA-measured variables that included BMC, BW, LM, and FM. A total of 32,066 adults from 13 datasets were included in the study. BMI classes were stratified based on WHO classifications. BW was normalized to LM (BW/LM) and FM (BW/FM). Paired t-tests were conducted to determine the differences between body tissue (LM vs FM) as well as normalized BW (BW/LM vs BW/FM). Pearson’s correlations were conducted for each BMI class to examine relationships between BMC and BW, BW/LM, and BW/FM. RESULTS: The paired t-tests produced significant differences between FM with LM (p<0.001) and BW/LM with BW/FM (p<0.001). For each BMI class, BW (p<0.01) and BW/FM (p<0.01) were positively correlated to BMC, while BW/LM (p<0.01) was negatively correlated to BMC (Table 1). CONCLUSION: Positive correlations indicate that increases in total BW and BW/FM can be protective for BMC. Mechanisms driving the negative correlation between BMC and BW/LM need to be explored.

Additional Files
Table 1.docx (13 kB)
Table 1

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