An alternative way to measure respiration induced changes of circumferences: a pilot study

Laufer, Bernhard; Krueger-Ziolek, Sabine; Docherty, Paul; Höflinger, Fabian; Reindl, Leonhard M.; Möeller, Knut

doi:10.1109/embc44109.2020.9175578

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…Putting the attention on circumferential changes, which are basically as well a distance change or expansion, then, due to the dynamic character and circular arrangement and the large dimension of these changes (changes up to 100 mm and more), their determination requires a special measuring principle. These dynamic circumferential changes of the upper body can be determined inductively, for example in RIP [ 35 ], by textile strain gauges [ 36 ], or by optical encoders via CiMeD belts [ 30 ].…”

Section: Methodsmentioning

confidence: 99%

“…This correction was done by calculating the imaginary centre of all markers in a specified height and subtracting the distance of the marker-midpoint to the skin surface from the distance of the centre of all markers to the marker-midpoint of the respective marker. (A detailed description of this performed correction procedure can be found in Laufer et al [ 30 ]). The individual calculation methods of the different employed parameters are explained in the subsequent subsections.…”

Section: Methodsmentioning

confidence: 99%

“…However, measurement methods in respiratory diagnostics with smart shirts are not very advanced in accurately determining respiratory volume, and a real breakthrough has not yet been achieved. Some studies focused on inertial measurement units IMUs [ 22 , 26 , 27 , 28 ] that can measure accelerations and tilt angles, others on strain gauges [ 29 ], or on optical encoder systems, such as CiMeD belts [ 30 ] that measure circumferential changes on the upper body by optical encoders.…”

Section: Introductionmentioning

confidence: 99%

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Characterisation and Quantification of Upper Body Surface Motions for Tidal Volume Determination in Lung-Healthy Individuals

Laufer

Höflinger

Docherty

et al. 2023

Sensors

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Measurement of accurate tidal volumes based on respiration-induced surface movements of the upper body would be valuable in clinical and sports monitoring applications, but most current methods lack the precision, ease of use, or cost effectiveness required for wide-scale uptake. In this paper, the theoretical ability of different sensors, such as inertial measurement units, strain gauges, or circumference measurement devices to determine tidal volumes were investigated, scrutinised and evaluated. Sixteen subjects performed different breathing patterns of different tidal volumes, while using a motion capture system to record surface motions and a spirometer as a reference to obtain tidal volumes. Subsequently, the motion-capture data were used to determine upper-body circumferences, tilt angles, distance changes, movements and accelerations—such data could potentially be measured using optical encoders, inertial measurement units, or strain gauges. From these parameters, the measurement range and correlation with the volume signal of the spirometer were determined. The highest correlations were found between the spirometer volume and upper body circumferences; surface deflection was also well correlated, while accelerations carried minor respiratory information. The ranges of thorax motion parameters measurable with common sensors and the values and correlations to respiratory volume are presented. This article thus provides a novel tool for sensor selection for a smart shirt analysis of respiration.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterisation and Quantification of Upper Body Surface Motions for Tidal Volume Determination in Lung-Healthy Individuals

Laufer

Höflinger

Docherty

et al. 2023

Sensors

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“…A previous study [3] has shown that upper body movements are in some cases highly correlated with changes in respiratory volumes. This fact can be utilized for the determination of respiratory volumes via upper body movements, and some current approaches used inertial measurement units [18][19][20], others used strain gauges [21,22] or optical encoder systems, as in belts measuring changes in circumferences [23][24][25]. However, a real breakthrough has not been achieved yet despite the potential of new, improved and miniaturized sensors or sensor technologies [26,27].…”

Section: Introductionmentioning

confidence: 99%

Sensor Selection for Tidal Volume Determination via Linear Regression—Impact of Lasso versus Ridge Regression

Laufer,

Docherty,

Murray

et al. 2023

Sensors

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The measurement of respiratory volume based on upper body movements by means of a smart shirt is increasingly requested in medical applications. This research used upper body surface motions obtained by a motion capture system, and two regression methods to determine the optimal selection and placement of sensors on a smart shirt to recover respiratory parameters from benchmark spirometry values. The results of the two regression methods (Ridge regression and the least absolute shrinkage and selection operator (Lasso)) were compared. This work shows that the Lasso method offers advantages compared to the Ridge regression, as it provides sparse solutions and is more robust to outliers. However, both methods can be used in this application since they lead to a similar sensor subset with lower computational demand (from exponential effort for full exhaustive search down to the order of O (n2)). A smart shirt for respiratory volume estimation could replace spirometry in some cases and would allow for a more convenient measurement of respiratory parameters in home care or hospital settings.

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An Alternative Way to Measure Tidal Volumes

Laufer

Krueger-Ziolek

Docherty

et al. 2020

8th European Medical and Biological Engineering Conference

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An alternative way to measure respiration induced changes of circumferences: a pilot study

Cited by 5 publications

References 20 publications

Characterisation and Quantification of Upper Body Surface Motions for Tidal Volume Determination in Lung-Healthy Individuals

Characterisation and Quantification of Upper Body Surface Motions for Tidal Volume Determination in Lung-Healthy Individuals

Sensor Selection for Tidal Volume Determination via Linear Regression—Impact of Lasso versus Ridge Regression

An Alternative Way to Measure Tidal Volumes

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