A1 Refereed original research article in a scientific journal
Body composition measurement by air displacement plethysmography in pregnancy: Comparison of predicted versus measured thoracic gas volume
Authors: Outi Pellonperä, Ella Koivuniemi, Tero Vahlberg, Kati Mokkala, Kristiina Tertti, Tapani Rönnemaa, Kirsi Laitinen
Publication year: 2019
Journal: Nutrition
Volume: 60
First page : 227
Last page: 229
Number of pages: 3
ISSN: 0899-9007
DOI: https://doi.org/10.1016/j.nut.2018.09.035
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/38204222
Objectives
Body
composition measurements with air displacement plethysmography (ADP)
define body volume, which must be corrected for thoracic gas volume
(TGV). We hypothesized that physiologic changes owing to pregnancy could
affect the accuracy of predicted TGV and introduce errors into body
composition measurements.
We
investigated the effect of measuring versus predicting TGV on the
accuracy of body composition calculations measured with ADP in
overweight and obese pregnant women. The fat and fat-free masses of 110
women were determined with ADP with predicted and measured TGV.
Measured TGV decreased from early to late pregnancy (P = 0.0002).
Compared with measured TGV, predicted TGV was 6.3% higher during early
gestation and 12.6% higher during late gestation (both P ≤
0.001). The use of predicted instead of measured TGV in body composition
calculations resulted in an overestimation of fat mass by 0.8% during
the early stage, and 2.6% during the late stage of pregnancy (both P ≤ 0.001).
Measuring
TGV increases the accuracy of body composition measurement by ADP in
overweight and obese women, particularly during the late stage of
pregnancy.
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