Differences in the relation between bone mineral content and lean body mass according to gender and reproductive status by age ranges
The present study aims: (1) to explore the influence of lean mass (LM) on bone mineral content (BMC), (2) to investigate the pubertal influences on the BMC–LM relation, and (3) to perform Z-score charts of BMC–LM relation, stratified by gender and reproductive status categorized by age ranges. A cross-sectional analysis was conducted using 4001 healthy subjects between 7 and 90 years participating in the Health Workers Cohort Study. Of these, 720 participants were ≤ 19 years, 2417 were women ≥ 20 years, and 864 were men ≥ 20 years. Using Dual X-ray absorptiometry (DXA), we measured BMC and LM. Participants’ pubertal development was assessed according to Tanner’s stage scale. To describe BMC–LM relation, simple correlation coefficients were computed. To produce best-fit equations, an ANOVA test was conducted. Z-score graphs for the BMC–LM relation were obtained. In general, the BMC–LM correlations were linear and highly significant. For boys, curves were virtually parallel, with similar intercepts and a progressive displacement of values toward the upper-right region of the graph, for each Tanner subgroup. For girls, curves for Tanner 1-2 and 4-5 stages were parallel; but, in girls Tanner 4-5, the intercepts were significantly higher by about +300–400 g of BMC (P < 0.001). For postmenopausal women, the curve was parallel to that for the premenopausal but showed a lower intercept (P < 0.001). We provide DXA reference data on a well-characterized cohort of 4001 healthy subjects. These reference curves provide a reference value for the assessment and monitoring of bone health in all age groups included in the present study.
KeywordsBone mineral content Lean mass Muscle–bone relation Tanner stage
The original study was supported by Consejo Nacional de Ciencia y Tecnología (Grant: 87783, and Grant: 7876) Mexico City.
The authors’ responsibilities were as follows: ED-G and JS designed the study and secured funding; ED-G, RV-C, BR, and JS conducted the research; RFC, LMN, JLF, and GRC performed the statistical analyses; EDG and GRC wrote the manuscript; EDG, PC, JLF, and GRC critically reviewed the manuscript. All authors reviewed and commented on the manuscript. All authors read and approved the final version of the paper.
Compliance with ethical standards
Conflict of interest
All authors have no conflicts of interest.
Statement of human and animal rights
The present study was conducted according to the Declaration of Helsinki guidelines. The ethics and research committees of all participating institutions [Comité de Ética e Investigación, Instituto Mexicano del Seguro Social (No. 12CEI0900614); Comité de Ética e Investigación, Instituto Nacional de Salud Pública (No.13CEI1700736); Comité de Ética, Centro de Investigación en Ciencias Médicas (No.1233008X0236)] reviewed and approved the study protocol and informed consent forms.
Signed written informed consent was previously obtained from all participants.
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