Abstract
Background/Objectives
Resting energy expenditure (REE) constitutes the largest component of total energy expenditure and undergoes an age-related decline that is unexplained by decreased fat-free mass. Phase angle (PhA) is a cellular health indicator that is possibly associated with REE. We investigated the association of REE and PhA in hospitalized older adults.
Subjects/Methods
This single-center, cross-sectional analysis utilized the baseline data from a prospective longitudinal study and included 131 eligible patients aged ≥70 years. The REE was measured using indirect calorimetry, and PhA and body composition were assessed using bioelectrical impedance. The association between REE, PhA, and body composition was examined, and REE was compared using previously reported PhA cutoff values.
Results
In this cohort with a mean (±standard deviation) age of 87.4 (±7.0) years, 34.4% of the participants were men. REE and PhA correlated strongly (r: 0.562, p < 0.001) and significantly after adjusting for age and sex (r: 0.433, p < 0.001). Multivariate analysis showed a significant independent association between REE and PhA and skeletal muscle mass (standardized β [95% CI]; 28.072 [2.188–53.956], p = 0.035) without any significant interaction between PhA and age on REE. The low PhA group had a significantly lower REE (kcal/day; 890 [856–925] vs. 1077 [1033–1122], p < 0.001), and this remained significant after adjusting for age, sex, and skeletal muscle mass index.
Conclusions
PhA is associated with REE in older adults. Adjusting REE calculation algorithms based on PhA values and correcting predicted REE according to PhA may aid in determining more accurate energy requirements.
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Data availability
The datasets generated during and/or analyzed during the current study are not publicly available due to privacy reasons and ethical restrictions related to patient data but are available from the corresponding author upon reasonable request.
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Acknowledgements
We would like to thank the medical staff at Asuke Hospital for their support and assistance with data collection. We would also like to thank Editage (http://www.editage.jp) for English language editing.
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Conceptualization: FK, YM, HO, MI, AS, HW, SK, and TT; Data curation: FK, HO, HW, MI, and AS; Formal analysis: FK; Investigation: FK, HO, HW, MI, AS, and HW; Methodology: FK, YM, and TT; Project administration: FK, YM, SK, and TT; Roles/Writing—original draft: FK; Writing—review and editing: FK, YM, HO, MI, AS, HW, SK, and TT. All the authors have read and approved the final version of the manuscript.
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Kawase, F., Masaki, Y., Ozawa, H. et al. Association of resting energy expenditure with phase angle in hospitalized older patients: a cross-sectional analysis. Eur J Clin Nutr 78, 187–192 (2024). https://doi.org/10.1038/s41430-023-01370-z
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DOI: https://doi.org/10.1038/s41430-023-01370-z