Steady State Condition in the Measurement of VO&lt;inf&gt;2&lt;/inf&gt;and VCO&lt;inf&gt;2&lt;/inf&gt;by Indirect Calorimetry

Cadena, Miguel; Sacristán, E.; Infante, Oscar; Escalante, B.; Rodríguez, Fausto J.

doi:10.1109/iembs.2005.1616315

Cited by 8 publications

(10 citation statements)

References 9 publications

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“…Indirect calorimetry with a canopy system (Vmax Encore 229; Viasys) was used to measure resting metabolic rate (RMR) using the abbreviated Weir equation. 24 Participants reported to the laboratory and rested quietly in a supine position for 30 minutes before collection…”

Section: Resting Metabolic Ratementioning

confidence: 99%

Three-Day Dietary Manipulation in Multiple Sclerosis

Bromley

Horvath

Bennett

et al. 2021

International Journal of MS Care

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Background: In persons with multiple sclerosis (MS), the effect of nutrition on exercise performance and fatigue remains unknown. The objective was to determine whether a 3-day diet high in triglycerides (FAT) compared with a 3-day diet high in carbohydrates (CARB) would improve fatigue and exercise performance in persons with MS. Methods: A randomized controlled crossover design was incorporated to study FAT versus CARB on submaximal cycling endurance (60% of peak oxygen consumption), substrate utilization, and fatigue in 12 persons with mild-to-moderate MS (Expanded Disability Status Scale score, 2.0–5.0) and 12 age- and sex-matched controls. Results: There were no differences in cycling time between diets in either group (P = .29). The MS group had no changes in fatigue between diets (P = .64); the control group demonstrated increased total mental fatigue after FAT (P = .05). The control group increased carbohydrate oxidation by 24% at rest and 13% during exercise after CARB. Similarly, the control group significantly increased fat oxidation after FAT by 22% at rest and 68% during exercise (P = .01). These changes were not seen in the MS group. Compared with controls, persons with MS oxidized approximately 50% less fat during exercise after FAT (P = .05). Conclusions: Neither CARB nor FAT altered submaximal exercise performance or baseline fatigue in the MS group. The results suggest that persons with MS are unable to adapt to dietary changes and oxidize fatty acids as efficiently as controls.

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Section: Resting Metabolic Ratementioning

confidence: 99%

Three-Day Dietary Manipulation in Multiple Sclerosis

Bromley

Horvath

Bennett

et al. 2021

International Journal of MS Care

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“…Another reason for the high discomfort of the mask could be the fastidious plastic smell; instead, the ventilated hood neutrally does not smell of anything. Further the anxiousness could lead to an increase in ventilation parameters, such as speed and depth of breathing, and ultimately additional RMR measurement error [3,40].…”

Section: Comparison Of the Indirect Calorimetersmentioning

confidence: 99%

Calorimetry in obese women: comparison of two different operating indirect calorimeters together with the predictive equation of Harris and Benedict

Hagedorn¹,

Savina²,

Coletti³

et al. 2010

Mediterr J Nutr Metab

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In patients with obesity, it is important to know the exact metabolic function in order to assess balanced nutritional support, reducing the risks of the initial situation. For an adequate detection of the resting metabolic rate (RMR), commonly indirect calorimeters are used. In the present study, two different indirect calorimeters [an expiratory collection open-circuit system (Fitmate) and a ventilated open-circuit system (Quark RMR)], were correlated and analysed for better adequacy. The predictive equation of Harris-Benedict (HBE) was confronted with the measured RMR of the better evaluated indirect calorimeter. 42 obese women (age 55 ± 12 years and BMI 42.9 ± 6.8 kg/m2) were included in the study after selecting patients according to the predefined inclusion and exclusion criteria. Measurement durations of each 15 min were performed after an overnight fast with both calorimeters. Received values of Fitmate and Quark were compared while the calorimeter with the more reliable values was compared with the HBE. Significant correlations (P<0.001) between the devices were achieved, although a significant difference of 1,051 kJ/day (14.9%) between Fitmate (7,542 ± 1,230 kJ/day) and Quark RMR (6,491 ± 806 kJ/day) was detected. The mean calculated RMR of the HBE (7,181 ± 716 kJ/day), in comparison with Quark RMR was significantly different (P<0.001). The correlation of the two indirect calorimeters, their different functioning, led to significant differences between devices and RMR measurements. The HBE was found to overestimate the measured RMR of Quark RMR. Though the HBE was developed on lean subject, it cannot be considered as a reliable equation for obese subjects. © 2011 Springer-Verlag

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“…Additionally, different ICT bench studies have been mainly devoted to show carefully the instruments performance (accuracy, precision, linearity, etc) without paying too much attention to the physiological issues together with the measurement model to explain differences between BbB and MC techniques [9]. This is probably because the metabolic dynamics studied by the ICT are not so well understood yet and due to the difficulty in comparing and interpreting similar results, which are related to the ample variety of instrument designs, that are not yet standardized [10], [11].…”

Section: Introductionmentioning

confidence: 99%

A Simple Model Implementation to Measure Breath by Breath the VO2 and VCO2 by the Indirect Calorimetry Technique

Cadena¹,

Sacristan²,

Infante³

et al. 2006

2006 International Conference of the IEEE Engineering in Medicine and Biology Society

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This paper proposes a discrete random time series modeling for the VO2 and VCO2 measurement in the Indirect Calorimetry Technique (ICT). Mathematical equations are developed in order to establish clear differences between the breath-by-breath and mixing chamber measurement based calorimeters. This simple model offers not only a physiological ICT definition approach but also defines the idea of VO2 and VCO2 short-term variability information for research. The preliminary results show a new physiological information when a computer oriented algorithm model implementation was applied to a data acquisition system in order to obtain the power spectrum analysis from a typical observation subject submitted to the clino-ortho maneuver.

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Steady State Condition in the Measurement of VO<inf>2</inf>and VCO<inf>2</inf>by Indirect Calorimetry

Cited by 8 publications

References 9 publications

Three-Day Dietary Manipulation in Multiple Sclerosis

Three-Day Dietary Manipulation in Multiple Sclerosis

Calorimetry in obese women: comparison of two different operating indirect calorimeters together with the predictive equation of Harris and Benedict

A Simple Model Implementation to Measure Breath by Breath the VO2 and VCO2 by the Indirect Calorimetry Technique

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