Validity, reliability and stability of the portable Cortex Metamax 3B gas analysis system

Macfarlane, Duncan J.; Wong, Paul

doi:10.1007/s00421-011-2230-7

Cited by 125 publications

(94 citation statements)

References 20 publications

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“…The measurement accuracy of the system in the present study was shown to be much better than that of some portable systems. Macfalane and Wong 15) reported that for the Metamax 3B (Cortex, Leipzig, Germany), the V ・ O2…”

Section: Discussionmentioning

confidence: 99%

Simultaneous multiple-subject analysis of respiratory gas exchange in humans

Hirano¹,

Yamada²,

Hibi³

et al. 2014

JPFSM

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Respiratory gas collection and analysis with indirect calorimetry allows assessment of energy and substrate use during rest and exercise and aerobic capacity. We have developed a novel system for simultaneous multiple-subject measurement of respiratory gas exchange during rest and exercise for up to five subjects, and validated the system with a series of experiments. Thirteen healthy young men (mean age 22 ± 2 years, height 172 ± 6 cm, weight 67.1 ± 11.6 kg) participated in this study. Memory problems of the mass spectrometer, which are caused by switching analyzed gases of different compositions between channels, was sufficiently eliminated with a washout of 2 s (seconds) with errors of less than 0.3% for O 2 and less than 0.4% for CO 2 . The high-response mass spectrometer and specially designed mixing chamber enabled correct estimation of metabolic measurements, even for gas concentration data from a non-continuous flow of any given 1s of every 10-s interval (spot-sampling method). Diet-induced thermogenesis (DIT) and oxygen consumption (V ・ O 2 ) during maximal incremental exercise were not significantly different between the novel and Douglas bag methods (P = 0.61 and P = 0.56, respectively). The limit of agreement of DIT and V ・ O 2 during maximal incremental exercise between the two methods were 2.8 ± 43.6% and 0.9 ± 4.8%, respectively. We concluded that the newly developed system has reasonable validity over a wide range.

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Section: Discussionmentioning

confidence: 99%

Simultaneous multiple-subject analysis of respiratory gas exchange in humans

Hirano¹,

Yamada²,

Hibi³

et al. 2014

JPFSM

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“…In the professional performance diagnostics, it is used to determine oxygen consumption, CO 2 emission and the respiratory minute volume, particularly for accurate determination of energy expenditure (in accordance with standard specifications, DIN EN ISO 8996: 2004). The technical failure of this unit is less than 2% [13]. The handy and user-friendly psychophysiological ambulatory Movisens measurement system optimizes research applications and records, a single channel ECG via dry electrodes built in a chest strap without disturbing the subject [14].…”

Section: Methodsmentioning

confidence: 99%

Comparative determination of physical stress and strain on milkers in milking parlours on dairy farms in Upper Austria, using ECG, an activity sensor and spirometer

Mayrhofer

Quendler

Prinz

et al. 2017

Ann Agric Environ Med.

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Quendler E, Mayrhofer M, Prinz B, Nimmerichter A. Comparative determination of physical stress and strain on milkers in milking parlours on dairy farms in Upper Austria, using ECG, an activity sensor and spirometer. Ann Agric Environ Med. 2017; 24(2): 294-298. AbstractTo-date, the impact of modern milking parlors in dairy farming on physical strain has not been the subject of many studies. Therefore, this case study aims to record and evaluate the physical strain during the entire milking process, including the oxygen consumption (VO 2 ), heart rate (HR) and metabolic rate (WkJ, Watt) of milkers. The recording was conducted with a portable respiratory gas analysis system and an ECG and activity sensor on 4 dairy farms in Austria. Eight subjects aged from 45-52 years, with a mean age 50±2.4 SD, participated and the data were recorded during the milking process in 2 types of milking parlours. For assessment, the entire milking process was divided into preparation, milking and follow-up work. The entire milking process was performed with an average oxygen consumption of 46.5 l/h and a heart rate of 98 bpm, which is below the anaerobic threshold; whereas in the preparation and follow-up work, this threshold was exceeded. Generally, during the milking process, a moderate physical strain (32.4%) and a balanced metabolic rate (143 watt/m 2 ) were determined. The physical strain in female milkers was 9.2% higher than in male milkers throughout the entire process. Reduction of physical strain can be achieved through additional breaks, reduced work speed, division of labour and technical devices.

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“…Resting metabolic rate (RMR) was measured by indirect calorimetry using measurement of VO 2 and VCO 2 (MetaMax 3B, Cortex, Biophysik, Germany) [ 28 ] . The MetaMax 3B system analyzer unit was calibrated according to the manufacturer's instructions before each testing session.…”

Section: Resting Metabolic Ratementioning

confidence: 99%

Energy Expenditure and Fitness Response Following Once Weekly Hill Climbing at Low Altitude

Tian

et al. 2015

Int J Sports Med

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mended for improving energy expenditure [ 21 ] and as a component of weight management for prevention of weight gain, for weight loss, and for prevention of weight regain after weight loss [ 11 , 49 ] . Increased PA and ET have been included in 88 % of successful weight loss and weight maintenance intervention programs [ 38 ] . A negative energy balance generated by PA/ET will result in weight loss, and the larger the negative energy balance, the greater the weight loss [ 11 ] . A dose eff ect is apparent for PA and weight loss, and higher doses are capable of providing 3 % or greater weight loss from initial weight [ 11 ] . Exercise expenditure > 10 500 kJ/week were substantially better at promoting long-term weight loss than that of < 4 200 kJ activity/week and 4 200-10 500 kJ. Specifi cally, 2.5 years after baseline, participants reporting > 10 500 kJ activity/week lost an average of 7 kg from baseline weight, whereas the other 2 groups had average weight losses of < 1 kg [ 50 ] . Resting metabolic rate (RMR) accounts for 60-70 % of daily energy expenditure and any interventional behavior that chronically alters RMR may have important implications for energy-balanced weight control [ 47 ] . Exercise is Introduction ▼The higher prevalence of obesity [ 12 ] may refl ect the imbalance between energy intake and expenditure, where energy intake exceeds energy expenditure over some period of time. Similarly, weight loss can occur only when energy expenditure is elevated above energy intake for a period of time. Finally, when energy intake is matched to energy expenditure, body weight remains constant [ 15 ] . To achieve significant safe weight loss, a minimum energy intake of 5 040 kJ/day for women and 6 300 kJ/day for men, respectively [ 38 ] , has been suggested. There is an inverse linear dose-response relationship between volume of physical activity and allcause mortality, and an energy expenditure of about 4 200 kJ/week is associated with a significant 20-30 % reduction in risk of all-cause mortality [ 13 ] . Approximately 31 % (95 % CI 30.9-31.2) of adults are physically inactive, with proportions ranging from 17.0 % in southeast Asia to about 43 % in the Americas and the eastern Mediterranean [ 16 ] . Increased physical activity (PA) and exercise training (ET) is therefore recom- ▼This work sought to determine the fi tness responses and energy expenditure (EE) following once-weekly hill climbing for 16 weeks on diff erent slopes. A cohort of 98 healthy, sedentary subjects (49 female, 49 male) completed the program at their preferred climbing pace. Body composition, resting metabolic rate (RMR) and VO 2 max were measured. EE was measured on 4 slopes (11.6 °, 19.9 °, 14.9 °, and 28.6 °) at the subjects' preferred speed. In males, weight, body mass index, fat mass signifi cantly decreased (P < 0.05), and RMR showed an increasing trend, but the difference was not signifi cant (P = 0.051). In females, the muscle mass increased signifi cantly, and fat ( %) and fat mass signifi cantly decreased (P < 0.05). Absolu...

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Validity, reliability and stability of the portable Cortex Metamax 3B gas analysis system

Cited by 125 publications

References 20 publications

Simultaneous multiple-subject analysis of respiratory gas exchange in humans

Simultaneous multiple-subject analysis of respiratory gas exchange in humans

Comparative determination of physical stress and strain on milkers in milking parlours on dairy farms in Upper Austria, using ECG, an activity sensor and spirometer

Energy Expenditure and Fitness Response Following Once Weekly Hill Climbing at Low Altitude

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