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Abstract
Background:
Indirect calorimetry (IC) is widely regarded as the benchmark for measuring resting energy expenditure (REE); however, the validity and reliability of such measurements have not been systematically synthesised in adults with overweight or obesity.
Objectives:
To evaluate the diagnostic accuracy (concurrent validity, predictive ability, reliability) of IC for measuring REE in adults with overweight or obesity.
Methods:
A rapid systematic review was conducted. PubMed and Web of Science were searched up to December 2023. Eligible studies measured REE by IC via gas-exchange in adults with overweight or obesity (sample BMI 25kg/m2 or mean BMI >30kg/m2) and reported primary outcomes: concurrent validity (comparison against any REE measure), predictive ability (association with any prospective health outcome), or reliability (inter-rater or intra-rater). Independent screening was conducted via Covidence. Findings were narratively synthesised.
Results:
n=4022 records were assessed and n=21 studies were included that evaluated n=13 IC devices. n=10 studies reported on concurrent validity (comparators were standard IC/whole room IC), n=7 studies reported on predictive validity (weight loss/recurrent weight gain), and n=7 studies reported on intra-rater reliability. n=1 hand-held IC device was examined by n=6 studies; most showed poor concurrent validity (n=3 of 4) and inconsistent intra-rater reliability (n=1 of 2 reliable); predictive ability was not assessed. n=9 standard desktop-based IC devices were examined by n=18 studies; most demonstrated high concurrent validity (n=3 of 4), predictive ability for weight loss (n=5 of 7), and good to excellent intra-rater reliability (n=6 of 6). n=1 study evaluated an IC accelerometer that had very weak concurrent validity. n=1 study evaluated a body composition-based IC that had strong concurrent validity. n=1 study evaluated a whole-room IC that had excellent intra-rater reliability.
Conclusion:
Standard desktop-based IC demonstrated the most consistent concurrent validity, predictive ability, and intra-rater reliability for assessing REE in adults with overweight or obesity. Hand-held IC may have limited validity and reliability compared to standard or whole-room IC. Accelerometer, body composition-based, and whole-room IC devices require further evaluation. Inconsistent findings may be attributed to using different methodologies and reference standards. Further research is needed to examine the diagnostic accuracy of IC especially in adults with overweight and obesity.
Indirect calorimetry (IC) is widely regarded as the benchmark for measuring resting energy expenditure (REE); however, the validity and reliability of such measurements have not been systematically synthesised in adults with overweight or obesity.
Objectives:
To evaluate the diagnostic accuracy (concurrent validity, predictive ability, reliability) of IC for measuring REE in adults with overweight or obesity.
Methods:
A rapid systematic review was conducted. PubMed and Web of Science were searched up to December 2023. Eligible studies measured REE by IC via gas-exchange in adults with overweight or obesity (sample BMI 25kg/m2 or mean BMI >30kg/m2) and reported primary outcomes: concurrent validity (comparison against any REE measure), predictive ability (association with any prospective health outcome), or reliability (inter-rater or intra-rater). Independent screening was conducted via Covidence. Findings were narratively synthesised.
Results:
n=4022 records were assessed and n=21 studies were included that evaluated n=13 IC devices. n=10 studies reported on concurrent validity (comparators were standard IC/whole room IC), n=7 studies reported on predictive validity (weight loss/recurrent weight gain), and n=7 studies reported on intra-rater reliability. n=1 hand-held IC device was examined by n=6 studies; most showed poor concurrent validity (n=3 of 4) and inconsistent intra-rater reliability (n=1 of 2 reliable); predictive ability was not assessed. n=9 standard desktop-based IC devices were examined by n=18 studies; most demonstrated high concurrent validity (n=3 of 4), predictive ability for weight loss (n=5 of 7), and good to excellent intra-rater reliability (n=6 of 6). n=1 study evaluated an IC accelerometer that had very weak concurrent validity. n=1 study evaluated a body composition-based IC that had strong concurrent validity. n=1 study evaluated a whole-room IC that had excellent intra-rater reliability.
Conclusion:
Standard desktop-based IC demonstrated the most consistent concurrent validity, predictive ability, and intra-rater reliability for assessing REE in adults with overweight or obesity. Hand-held IC may have limited validity and reliability compared to standard or whole-room IC. Accelerometer, body composition-based, and whole-room IC devices require further evaluation. Inconsistent findings may be attributed to using different methodologies and reference standards. Further research is needed to examine the diagnostic accuracy of IC especially in adults with overweight and obesity.
| Original language | English |
|---|---|
| Article number | 125 |
| Pages (from-to) | 145-145 |
| Number of pages | 1 |
| Journal | Obesity Surgery |
| Volume | 34 |
| Issue number | Issue 2 supplement |
| Publication status | Published - 8 Oct 2024 |
| Event | XXVII World Congress of the International Federation for the Surgery of Obesity and Metabolic Disorders 2024 - Melbourne Convention and Exhibition Centre, Melbourne, Australia Duration: 3 Sept 2024 → 6 Sept 2024 https://ifso2024.org/ |
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