Scholarlink

Background/objectives <p>Dual-energy x-ray absorptiometry (DXA) has been suggested as an alternative method for estimating body volume (BV), a component of the reference four-compartment body composition model. This study reports the development and validation of DXA-BV<sub>Silva</sub>, a novel DXA-derived BV equation. An additional aim was to develop an estimate of lean soft tissue density (D<sub>LST</sub>), a key variable in the theory-based approach, by estimating total body protein with a six-compartment model.</p> Methods <p>A sample of 332 athletes (36.7% females) from several sports were randomly assigned to either the development (<i>n</i> = 232) or cross-validation group (<i>n</i> = 100). DXA-BV<sub>Silva</sub> was developed via linear regression of DXA-measured fat, lean soft tissue, and bone mineral mass against BV measured with air displacement plethysmography (ADP). A D<sub>LST</sub> estimate of 1.064 kg/L (SD = 0.006) was obtained from a subset of the development sample comprising 201 athletes (36.3% females) with available measurements of total-body water by deuterium dilution, bone mineral by DXA and BV by ADP, enabling total-body protein determination from a six-compartment model.</p> Results <p>DXA-BV<sub>Silva</sub> provided the closest BV estimation (mean difference = 0.05 L, SD = 0.46 L; ES [95% CI] = 0.11 [−0.08; 0.31]) and the 95% limits of agreement (−0.86 to 0.96 L) were narrower than existing empirical equations.</p> Conclusion <p>We conducted the first comparative analysis of both empirical and theoretical BV estimation methods using DXA, demonstrating the validity of DXA-BV<sub>Silva</sub> for BV estimation in athletes, presenting a robust alternative to ADP, with potential applications in multicomponent body composition models.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Novel comparative analysis and equation development for body volume estimation using dual-energy x-ray absorptiometry in athletes

  • 期刊论文

  • 发表日期：

    2025年3月21日

查看全文
  • Tiago R. Silva,
  • Filipe Jesus,
  • Rui Poínhos,
  • Luís B. Sardinha,
  • Vitor Hugo Teixeira,
  • Steven B. Heymsfield,
  • Analiza M. Silva

摘要

Background/objectives

Dual-energy x-ray absorptiometry (DXA) has been suggested as an alternative method for estimating body volume (BV), a component of the reference four-compartment body composition model. This study reports the development and validation of DXA-BVSilva, a novel DXA-derived BV equation. An additional aim was to develop an estimate of lean soft tissue density (DLST), a key variable in the theory-based approach, by estimating total body protein with a six-compartment model.

Methods

A sample of 332 athletes (36.7% females) from several sports were randomly assigned to either the development (n = 232) or cross-validation group (n = 100). DXA-BVSilva was developed via linear regression of DXA-measured fat, lean soft tissue, and bone mineral mass against BV measured with air displacement plethysmography (ADP). A DLST estimate of 1.064 kg/L (SD = 0.006) was obtained from a subset of the development sample comprising 201 athletes (36.3% females) with available measurements of total-body water by deuterium dilution, bone mineral by DXA and BV by ADP, enabling total-body protein determination from a six-compartment model.

Results

DXA-BVSilva provided the closest BV estimation (mean difference = 0.05 L, SD = 0.46 L; ES [95% CI] = 0.11 [−0.08; 0.31]) and the 95% limits of agreement (−0.86 to 0.96 L) were narrower than existing empirical equations.

Conclusion

We conducted the first comparative analysis of both empirical and theoretical BV estimation methods using DXA, demonstrating the validity of DXA-BVSilva for BV estimation in athletes, presenting a robust alternative to ADP, with potential applications in multicomponent body composition models.