Cardiopulmonary exercise testing and body composition

Per Karlsson, Lars Lind, Karl Michaëlsson, Andrei Malinovschi
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Abstract

The cardiopulmonary exercise test (CPET) evaluates cardiopulmonary function. In light of the obesity epidemic, it is important to understand how body composition affects interpretation of CPET results.to assess the relationship between CPET measures, others than peak oxygen uptake, and body composition.A total of 330 participants, aged 50 years, performed both a CPET and a Dual-energy x-ray absorptiometry (DXA). From CPET, peak exercise respiratory exchange ratio (RER), ventilatory efficiency (VE/VCO2slope) and work efficiency (ΔVO2/ΔWR) were recorded. Pearson's correlation was used to assess the association between CPET measures and selected body composition measures including body mass index (BMI), waist circumference, fat mass, lean mass, body fat percentage and percentage trunk fat to fat mass. All analyses were done stratified by sex. A p-value<0.05 defined statistical significance.RER was negatively correlated with body composition measures; the strongest correlation was observed with waist circumference in females (r=−0.36). VE/VCO2slope had no significant correlations with any body composition measures.ΔVO2/ΔWR was positively correlated with the body composition measures; the strongest correlation was observed with BMI (r=0.24). The additive role of percentage body fat and percentage trunk fat were studied in a linear regression model using waist circumference and BMI to predict the above-named CPET measures and no additive role was found.RER andΔVO2/ΔWR may be influenced by body composition while VE/VCO2slope is not affected. Adiposity measures from DXA add no additional explanatory value to the CPET measures.
心肺运动测试和身体成分
心肺运动测试(CPET)评估心肺功能。共有 330 名 50 岁的参与者进行了 CPET 和双能 X 射线吸收测定(DXA)。CPET 记录了峰值运动呼吸交换比(RER)、通气效率(VE/VCO2slope)和工作效率(ΔVO2/ΔWR)。采用皮尔逊相关性来评估 CPET 指标与选定的身体成分指标(包括体重指数 (BMI)、腰围、脂肪量、瘦肉量、体脂百分比和躯干脂肪占脂肪量的百分比)之间的关联。所有分析均按性别进行分层。RER与身体成分指标呈负相关;女性与腰围的相关性最强(r=-0.36)。ΔVO2/ΔWR与身体成分指标呈正相关;与体重指数的相关性最强(r=0.24)。在使用腰围和体重指数预测上述 CPET 指标的线性回归模型中,研究了体脂百分比和躯干脂肪百分比的相加作用,结果没有发现相加作用。来自 DXA 的脂肪测量值对 CPET 测量值没有额外的解释价值。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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