Estimates of ventilation from measurements of rib cage and abdominal distances: a portable device

Abstract

To validate a new device designed to measure ventilation (V(E)), tidal volume (V(T)), inspiratory time (T(I)), and expiratory time (T(E)) during daily life activities. The anteroposterior displacement of the rib cage and abdomen and the axial displacements of the chest wall and the spine were measured using two pairs of magnetometers. was estimated from these four signals, and was simultaneously measured using a spirometer. A total of 707, 732, and 1,138 breaths were analyzed in sitting, standing, and exercise conditions, respectively. We compared V(E), V(T), T(I), and, T(E) measured by magnetometers (V(E)mag, V(T)mag, T(I)mag, and T(E)mag) with V(E), V(T), T(I), and T(E) measured by a spirometer V(E)spiro, V(T)spiro, T(I)spiro, and T(E)spiro, respectively). For pooled data V(E)mag, V(T)mag, T(I)mag, and T(E)mag were significantly correlated (p < 0.001) with V(E)spiro, V(T)spiro, T(I)spiro, and T(E)spiro in sitting and standing positions and during the walking exercise. The mean differences, between V(E)mag, and V(E)spiro for the group, were 10.44, 10.74, and 12.06% in sitting, standing, and exercise conditions, respectively. These results demonstrate the capacity of this new device to measure V(E) with reasonable accuracy in sitting, standing, and exercise conditions.

A new method to estimate energy expenditure from abdominal and rib cage distances

“…A new device (Nomics-WSL2, Liege Science Park, Belgium) has been developed so as to estimate _ V E (Gastinger et al 2010a). This device is made up of two pairs of electromagnetic coils securely connected to a case.…”

“…The development of a group equation could be an interesting solution that would increase the feasibility of our method under daily life conditions. Given the high correlation between _ VO 2 and indirect calorimetry-assessed EE described in the literature (Harrell et al 2005;Macfarlane 2001;Montoye et al 1996), the validity of the _ V E method for estimating _ VO 2 (Gastinger et al 2010b) and the validation of the measurement of _ V E from two pairs of electromagnetic coils (Gastinger et al 2010a) (Fig. 1), the aims of our study are: (1) to ensure the validity of electromagnetic coils so as to estimate EE under resting and moderate exercise conditions and (2) to prove the feasibility of our method of estimating EE from the application of a group equation in comparison with the individual equations.…”

Calibrating a novel multi-sensor physical activity measurement system

“…Similar to our study, the estimation technique used by Witt et al was low on precision (Witt et al, 2006). In comparison, Gastinger et al reported similar bias (−1.03 L˙min −1 ) but better precision (95% limits of agreement= −8.23 to 6.17 L˙min −1 ) in predicting ventilation volume (Gastinger et al, 2010). The activities performed in the studies by Witt et al and Gastinger et al were limited to rhythmic ambulatory activities and did not induce a lot of variability in respiration.…”

Revisiting Ventilatory and Cardiovascular Predictions of Whole-Body Metabolic Rate

“…28,29 Another approach within occupations that use breathing apparatus to provide an uncontaminated, self-contained air supply is to use Boyle's Law to calculate the volume of gas inspired over the work duration, and an average minute ventilation. Unfortunately, such measures are difficult in the field, although portable monitors are available to quantify chest-wall displacement.…”