The relationship between inspiratory muscle strength with the parameters from structured light plethysmography

Abstract

<b>Aim:</b> Structured Light Plethysmography (SLP) is a non-invasive, non-contact technique, utilising the movement of the thoraco-abdominal wall to measure a range of breathing-related parameters. The aim of this study was to compare the relationship between inspiratory muscle strength and parameters from (SLP). <b>Methods:</b> Thirty four healthy individuals (27.15±4.02 years, 14 Male, 20 Female) participated in this study. Every participant underwent SLP evaluation. The following SLP parameters were included for analysis; IE50: the ratio of inspiratory flow at 50% of tidal volume (VT) to expiratory flow at 50% of VT and Principal Angle: it is the angle of the dominant axis of the Konno-Mead loop relative to the 45° line. We have taken into consideration of thorax-abdomen contribution. The inspiratory muscle strength (S-index) and peak inspiratory flow (PIF) were evaluated using Powerbreathe K5 device. <b>Results:</b> The individuals’ results showed in the table. The IE50 was correlated with S-index (r=0.474, p=0.011), PIF (r=0.489, p=0.008) and principal angle was also related with S-index (r=-0.426, p=0.021), PIF (r=-0.471, p=0.010). <b>Conclusions:</b> We have demonstrated that IE50 and principal angle by SLP related with inspiratory muscle strength in healthy individuals. There could be a role of using SLP for interpreting inspiratory muscle function, especially it can be useful during pandemic due to its non-contact nature.