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Reliability and minimal detectable change of thoracoabdominal mobility measurements using photogrammetry
Karine J Sarro1, Camila L Mombrini2, Thais B Tonole2
1a Faculty of Physical Education , University of Campinas - UNICAMP , Campinas , SP , Brazil.
Physiotherapy Theory and Practice
|January 17, 2018
Summary
Photogrammetry is a reliable method for measuring thoracoabdominal mobility, especially when used by experienced professionals. However, latero-lateral measurements require caution due to potential errors.
Area of Science:
- Biomechanics
- Medical Imaging
- Clinical Measurement
Background:
- Accurate measurement of thoracoabdominal mobility is crucial for clinical decision-making.
- Understanding measurement errors, including intrarater and interrater reliability and minimal detectable change (MDC), is essential before tool implementation.
- Photogrammetry offers a non-invasive approach to assess respiratory mechanics.
Purpose of the Study:
- To investigate the intrarater and interrater reliability and MDC of thoracoabdominal mobility measurements using photogrammetry.
- To compare the performance of novice and experienced raters in photogrammetric analysis of thoracoabdominal mobility.
- To determine the validity and potential limitations of photogrammetry for assessing respiratory excursions.
Main Methods:
- Photogrammetric analysis of thoracoabdominal mobility was performed on 17 healthy participants.
- Photographs were taken during maximal inspiration and expiration in apnea to calculate thoracic and abdominal diameters.
- Measurements were conducted by one novice and one experienced rater, each performing three trials.
Main Results:
- High intrarater and interrater reliability (average ICC: 0.97-0.98; average MDC: 0.3-0.35) were observed for experienced raters and interrater comparisons.
- Novice raters showed moderate reliability for latero-lateral abdominal and thoracic measurements (ICC: 0.52-0.61; MDC: 1.42-2.05).
- Latero-lateral mobility measurements, particularly for the abdomen, exhibited poorer reliability.
Conclusions:
- Photogrammetric assessment of thoracoabdominal mobility is a reliable method when executed by experienced professionals.
- Latero-lateral mobility measurements using photogrammetry are more susceptible to error and should be interpreted with caution.
- The calculated MDC values serve as critical thresholds to distinguish true changes from measurement error due to rater variability.
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