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1. Ventilation: a Reliable Indicator of Oxygen Consumption During Physical Activities of Various Intensities? (P222).

Author

Gastinger, S., Nicolas, G., Sorel, A., Gratas-Delamarche, A., Zouha, H., Delamarche, P., and Prioux, J.

Abstract

Several methods have tried to quantify physical activity using the relation between heart rate (HR) and oxygen consumption ( ]> O2). Considering the limits of this relation, we focus our work on another physiological index: ventilation ( ]> E). The aim of this study is to show that ]> E is more strongly correlated with ]> O2 than HR. Eight male subjects carried out four physical activities of various intensities: walking at 4 km.h−1, walking at 4 km.h−1 with load, running at 8 km.h−1 and cycling at 60 W. The ventilatory parameters ( ]> O2 and ]> E) were measured by a portable indirect calorimetry system (VO2000 MedGraphics) and HR was measured with a cardiofrequencemeter. Coefficients of determination (r2 linear) of the relations ]> O2=f( ]> E) and ]> O2=f(HR) were calculated for each subject (on each activity [r2Ttot: 64 regressions], on all the four activities [r24activities: 16 regressions]) and then for the eight subjects joined together on all the four activities (r2global: 2 regressions). Results showed that the r2Ttot of the relation ]> O2=f( ]> E) were significantly higher than those of the relation ]> O2=f(HR) for the tasks: walking at 4 km.h−1 (p<0.001), walking at 4 km.h−1 with load (p<0.001), running at 8 km.h−1 (p<0.05). The mean values of r24activity of the relation ]> O2=f( ]> E) were significantly higher than those of the relation ]> O2=f(HR)(p≤0.001). Finally, the r2global of the relation ]> O2=f( ]> E) were higher than those of the relation ]> O2=f(HR). In view of these results, it seems that ]> E is more strongly correlated with ]> O2 than HR. This approach seems very promising in order to develop a new method for the quantification of physical activity. Nevertheless, other experiments with a more significant number of subjects and activities have to be carried out to validate this first study. [ABSTRACT FROM AUTHOR]

Published
2008
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2. A new method to estimate energy expenditure from abdominal and rib cage distances.

Author

Gastinger, S., Sefati, H., Nicolas, G., Sorel, A., Gratas-Delamarche, A., and Prioux, J.

Subjects
CALORIC expenditure, ABDOMEN, RIB cage, PHYSICAL activity, CALORIMETRY, WALKING, ABDOMINAL physiology, CHEST physiology, BIOLOGICAL models, COMPARATIVE studies, ELECTROMAGNETISM, ENERGY metabolism, EXERCISE, RESEARCH methodology, MEDICAL cooperation, PATIENT monitoring, RESEARCH, STATISTICS, PILOT projects, EVALUATION research, RANDOMIZED controlled trials, PHYSIOLOGY
Abstract

The aim of this paper is to validate a new method of energy expenditure (EE) estimation stemming solely from the measurement of rib cage, abdominal and chest wall distances. We set out to prove that the variations of these distances, measured by two pairs of electromagnetic coils, lead to the estimation of the ventilation (VE) and the EE. Eleven subjects were recruited to take part in this study (27.6 ± 5.4 years; 73.7 ± 9.7 kg). Each subject participated in two tests. The objective of Test 1 was to determine the individual and group equations between the VE and EE during light to moderate activities while Test 2 compared the two pairs of electromagnetic coils with the indirect calorimetry so as to estimate EE in upright sitting and standing positions and during walking exercises. During Test 2, we compared EE measured by indirect calorimetry (EE(IC-Val-REF)) with EE estimated by the two pairs of electromagnetic coils through the application of: (1) the individual equation (EE(mag-Val-INDIV)) and (2) the group equation (EE(mag-val-GROUP)). The results show that there is no significant difference between EE(IC-Val-REF) and EE(mag-Val-INDIV) and between EE(IC-Val-REF) and EE(mag-val-GROUP) for each activity. Furthermore, the mean difference seems to show that the estimation of EE is better with the group equation. In conclusion, on the proven basis of this study we are able to validate this new method which permits the estimation of EE from abdominal and rib cage distances. This study also highlights the advantage of using a group equation to the estimate EE. [ABSTRACT FROM AUTHOR]

Published
2011
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3. Estimates of ventilation from measurements of rib cage and abdominal distances: a portable device.

Author

Gastinger, S., Sefati, H., Nicolas, G., Sorel, A., Gratas-Delamarche, A., and Prioux, J.

Subjects
VENTILATION, RIB cage, ABDOMEN, EXERCISE, MAGNETOMETERS, PATIENT monitoring equipment, SPIROMETRY equipment, ABDOMINAL physiology, ANTHROPOMETRY, COMPARATIVE studies, RESEARCH methodology, MEDICAL cooperation, MOTOR ability, RESEARCH, RESEARCH evaluation, RESPIRATION, PRODUCT design, EVALUATION research, MEDICAL equipment reliability, PHYSIOLOGY, ANATOMY, EQUIPMENT & supplies
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. [ABSTRACT FROM AUTHOR]

Published
2010
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