Abstract
Background: Wearables are of increasing relevance in the pulmonary field. The validity and reproducibility of tidal volumes (TV) measured during daily tasks is investigated, comparing a smart shirt to mobile spirometry.
Methods: Fifteen healthy subjects (age 34.1±13.7) were included. TV measured with QDC-calibrated respiratory inductance plethysmography (RIP) sensors in a smart shirt (Hexoskin) with a custom developed app (Medwear) was compared to Oxycon Mobile (OM) (Vyaire Medical) in seven tasks of daily living. All tasks were performed twice in two sessions (s1 and s2), in between the shirt was removed. Calibration was determined per task in s1, and was applied to the repeated task in s2. TV from RIP and OM were compared within a task within a subject with a Bland-Altman analysis. The mean of these subject-task biases and limits of agreement (loa) were calculated to determine the overall validity of RIP.
Results: TV ranges between 0.64±0.13 L (bend sitting) and 1.63±0.49 L (stair climbing).
Conclusion: The smart shirt is valid to measure TV in healthy subjects, and calibration determined in a task can be applied to the same repeated task with reproducible results. In the near future the same method will be used to investigate the ability of the shirt to measure lung volumes in patients with chronic obstructive pulmonary disease.
Footnotes
Cite this article as: European Respiratory Journal 2019; 54: Suppl. 63, PA2228.
This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).
- Copyright ©the authors 2019