CBIOS-Universidade Lusófona's Research Center for Biosciences and Health Technologies, Av. Campo Grande 376, 1749-024 Lisbon, Portugal.
Int J Environ Res Public Health. 2022 Oct 27;19(21):13940. doi: 10.3390/ijerph192113940.
Bioimpedance (BIA) is the most frequently used technology for body composition assessment at a daily clinical level, mostly due to its low price and user-friendly operation. However, many doubts persist regarding its physiological meaning and applicability. The present study aimed to compare one BIA system and the Dual-Energy X-ray Absorptiometry (DXA) for the characterization of body composition in a previously selected cohort of healthy adult participants. A descriptive observational cross-sectional study included a final sample of 121 participants, 93 women and 28 men, with a mean age of 28.26 ± 9.72 years old and a mean body mass index (BMI) of 22.68 ± 3.13 kg/m. Statistics involved paired -tests and agreement analysis by the Bland-Altman method. BIA underestimated the percent body fat (%BF) by 5.56% and overestimated Fat-Free Mass (FFM) by 2.90 kg. A strong positive correlation between both technologies was found for FFM (r = 0.980) and the %BF (r = 0.932), but the disagreement was statistically significant ( < 0.001). Although DXA and BIA seem to correlate, these technologies are not congruent. Therefore, the risk of (mis)interpretation and bias is clear with BIA, potentially impacting the nutritional planning of clinical dietitians and the further results of its patients.
生物阻抗（BIA）是最常用于日常临床水平评估身体成分的技术，主要是因为其价格低廉且易于操作。然而，对于其生理学意义和适用性仍然存在许多疑问。本研究旨在比较一种 BIA 系统和双能 X 射线吸收法（DXA）在之前选择的健康成年参与者队列中对身体成分的特征描述。一项描述性观察性横断面研究包括 121 名参与者的最终样本，其中 93 名女性和 28 名男性，平均年龄为 28.26 ± 9.72 岁，平均体重指数（BMI）为 22.68 ± 3.13 kg/m²。统计学分析涉及配对 t 检验和 Bland-Altman 方法的一致性分析。BIA 低估了体脂肪百分比（%BF）5.56%，高估了无脂肪质量（FFM）2.90kg。两种技术的 FFM（r = 0.980）和 %BF（r = 0.932）之间存在很强的正相关，但差异具有统计学意义（<0.001）。尽管 DXA 和 BIA 似乎相关，但这两种技术并不一致。因此，BIA 存在（错误）解释和偏倚的风险，这可能会影响临床营养师的营养计划及其患者的进一步结果。
