Validity of thoracic respiratory inductive plethysmography in high body mass index subjects

Respir Physiol Neurobiol. 2017 Aug;242:52-58. doi: 10.1016/j.resp.2017.03.009. Epub 2017 Mar 28.

Abstract

We aim to evaluate thoracic respiratory inductive plethysmography (RIP) in high body mass index (BMI) subjects with a pneumotachometer (PT) as a reference. We simultaneously evaluated spontaneous breathing by RIP and PT in 10 low and 10 high BMI subjects at rest and in moderate exercise. We then recorded RIP amplitude with different excursions mimicking respiratory thoracic deformation, with different sizes of RIP belts surrounding cylinders of different perimeters with or without deformable foam simulating adipose tissue. RIP responses correlated with PT values in low and high BMI groups for inspiratory time (r=0.86 and r=0.91, respectively), expiratory time (r=0.96 and r=0.91, respectively) and amplitude (r=0.82 for both) but with a bias (-0.23±0.25L) for high BMI subjects. ANOVA revealed the effects of perimeter and simulated adiposity (p<0.001 for both). We concluded that thoracic perimeter and deformity of adipose tissue are responsible for biases in RIP response in high BMI subjects.

Keywords: BMI; Exercise; Respiratory inductive plethysmography; Validation.

Publication types

  • Validation Study

MeSH terms

  • Adipose Tissue / physiopathology
  • Adult
  • Algorithms
  • Analysis of Variance
  • Body Mass Index*
  • Elasticity
  • Exercise / physiology
  • Exercise Test
  • Female
  • Humans
  • Male
  • Middle Aged
  • Models, Biological
  • Obesity / pathology
  • Obesity / physiopathology
  • Organ Size
  • Plethysmography* / instrumentation
  • Respiration*
  • Rest
  • Thorax / pathology
  • Thorax / physiopathology
  • Time Factors
  • Viscosity