The validity of the Moxus Modular metabolic system during incremental exercise tests: impacts on detection of small changes in oxygen consumption

Beltrami, Fernando G.; Froyd, Christian; Mamen, Asgeir; Noakes, Timothy D.

doi:10.1007/s00421-014-2825-x

Cited by 6 publications

(7 citation statements)

References 37 publications

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“…The data collection took place at low altitude (\ 300 m above sea level) at three different laboratories. The skiers performed tests at Mid Sweden University, Ö stersund, Sweden 30 [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and a capillary blood sample was taken from a fingertip to analyse blood lactate (La) (Biosen S-line Lab + , EKF-Diagnostic, Cardiff, UK).…”

Section: Data Collection and Analysismentioning

confidence: 99%

Breathing resistance in metabolic systems: Its effects on pulmonary ventilation and oxygen uptake in elite athletes with high aerobic power

Ainegren

Jensen

Rosdahl

2020

Proceedings of the Institution of Mechanical Engineers, Part P:

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The aim of this study was to investigate the effects on pulmonary ventilation and oxygen uptake ( [Formula: see text]O2) in athletes with a very high maximal oxygen uptake ( [Formula: see text]O2 max) and corresponding high ventilation capacity when using a modern metabolic system with relatively high resistance to breathing (HIGHRES), compared to a traditional system with low resistance to breathing (LOWRES). Four rowers and three cross-country skiers (without asthma), competing at a high international level, performed in experimental conditions with LOWRES and HIGHRES using a rowing ergometer and roller skis on a treadmill. The results showed that [Formula: see text]O2, blood lactate, heart rate and respiratory exchange ratio were not different between the LOWRES and HIGHRES test conditions during both submaximal and maximal exercise. Also, the athlete’s time to exhaustion (treadmill) and mean power (rowing ergometer) from maximal tests were no different between the two conditions. However, ventilation and expiratory O2 and CO2 concentrations were different for both submaximal and maximal exercise. Thus, the authors have concluded that the differences in resistance to breathing of metabolic systems influence elite endurance athletes [Formula: see text] E at low to very high workloads, thus affecting the expired gas fractions, but not the submaximal [Formula: see text]O2, [Formula: see text]O2 max and performance in a laboratory setting at sea level.

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Section: Data Collection and Analysismentioning

confidence: 99%

Breathing resistance in metabolic systems: Its effects on pulmonary ventilation and oxygen uptake in elite athletes with high aerobic power

Ainegren

Jensen

Rosdahl

2020

Proceedings of the Institution of Mechanical Engineers, Part P:

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“…Thereafter, each player's RMR was assessed using the Moxus Modular Metabolic System (AEI Technologies, IL, USA), which had been previously calibrated according to manufacturer's guidelines (Beltrami et al, 2014).…”

Section: Body Composition and Resting Metabolic Rate (Rmr)mentioning

confidence: 99%

The Assessment of Total Energy Expenditure During a 14-Day In-Season Period of Professional Rugby League Players Using the Doubly Labelled Water Method

Morehen¹,

Bradley²,

Clarke³

et al. 2016

International Journal of Sport Nutrition and Exercise Metabolism

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Rugby League is a high-intensity collision sport competed over 80-minutes. Training loads are monitored to maximise recovery and assist in the design of nutritional strategies although no data are available on the Total Energy Expenditure (TEE) of players. We therefore assessed Resting Metabolic Rate (RMR) and TEE in six SuperLeague players over two consecutive weeks in-season including one-game per week.Fasted RMR was assessed followed by a baseline urine sample before oral administration of a bolus dose of hydrogen (deuterium 2 H) and oxygen ( 18 O) stable isotopes in the form of water ( 2 H2 18 O). Every 24 hours thereafter, players provided urine for analysis of TEE via DLW method. Individual training-load was quantified using session rating of perceived exertion (sRPE) and data were analysed using magnitudebased inferences. There were unclear differences in RMR between forwards and backs (7.7 ± 0.5 cf. 8.0 ± 0.3 MJ, respectively). Indirect calorimetry produced RMR values most likely lower than predictive equations (7.9 ± 0.4 cf. 9.2 ± 0.4 MJ, respectively). A most likely increase in TEE from week-1 to -2 was observed (17.9 ± 2.1 cf. 24.2 ± 3.4 MJ) explained by a most likely increase in weekly sRPE (432 ± 19 cf. 555 ± 22 AU), respectively. The difference in TEE between forwards and backs was unclear (21.6 ± 4.2 cf. 20.5 ± 4.9 MJ, respectively). We report greater TEE than previously reported in rugby that could be explained by the ability of DLW to account for all match and trainingrelated activities that contributes to TEE.

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“…During the baseline visit, radial artery (RA) shear-mediated dilation was assessed in both arms using FMD. Following FMD, peak oxygen consumption ( V O 2peak ) during maximal graded exercise on a cycle ergometer (Lode Excalibur Sport Cycle Ergometer, The Netherlands) was also assessed, using a gas analysis system (MOXUS Metabolic Cart (AEI Technology, USA) (Cocks and Wagenmakers 2016 ; Medbø et al 2012 ; Beltrami et al 2014 ). Briefly, participants started cycling at 60 W for 3 min; following this, the workload was increased by 35 W every 3 min until volitional fatigue.…”

Section: Methodsmentioning

confidence: 99%

Impact of catheterization on shear-mediated arterial dilation in healthy young men

et al. 2020

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Purpose Animal studies have shown that endothelial denudation abolishes vasodilation in response to increased shear stress. Interestingly, shear-mediated dilation has been reported to be reduced, but not abolished, in coronary artery disease (CAD) patients following catheterization. However, it is not known whether this resulted from a priori endothelial dysfunction in this diseased population. In this study, we evaluated shear-mediated dilation following catheterization in healthy young men. Methods Twenty-six (age: 24.4 ± 3.8 years, BMI: 24.3 ± 2.8 kg m−2, VO2peak: 50.5 ± 8.8 ml/kg/min) healthy males underwent unilateral transradial catheterization. Shear-mediated dilation of both radial arteries was measured using flow-mediated dilation (FMD) pre-, and 7 days post-catheterization. Results FMD was reduced in the catheterized arm [9.3 ± 4.1% to 4.3 ± 4.1% (P < 0.001)] post-catheterization, whereas no change was observed in the control arm [8.4 ± 3.8% to 7.3 ± 3.8% (P = 0.168)]. FMD was completely abolished in the catheterized arm in five participants. Baseline diameter (P = 0.001) and peak diameter during FMD (P = 0.035) were increased in the catheterized arm 7 days post-catheterization (baseline: 2.3 ± 0.3 to 2.6 ± 0.2 mm, P < 0.001, peak: 2.5 ± 0.3 to 2.7 ± 0.3 mm, P = 0.001), with no change in the control arm (baseline: 2.3 ± 0.3 to 2.3 ± 0.3 mm, P = 0.288, peak: 2.5 ± 0.3 to 2.5 ± 0.3 mm, P = 0.608). Conclusion This is the first study in young healthy individuals with intact a priori endothelial function to provide evidence of impaired shear-mediated dilation following catheterization. When combined with earlier studies in CAD patients, our data suggest the catheterization impairs artery function in humans.

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The validity of the Moxus Modular metabolic system during incremental exercise tests: impacts on detection of small changes in oxygen consumption

Cited by 6 publications

References 37 publications

Breathing resistance in metabolic systems: Its effects on pulmonary ventilation and oxygen uptake in elite athletes with high aerobic power

Breathing resistance in metabolic systems: Its effects on pulmonary ventilation and oxygen uptake in elite athletes with high aerobic power

The Assessment of Total Energy Expenditure During a 14-Day In-Season Period of Professional Rugby League Players Using the Doubly Labelled Water Method

Impact of catheterization on shear-mediated arterial dilation in healthy young men

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