scholarly journals Novel Computerized Method for Automated Determination of Ventilatory Threshold and Respiratory Compensation Point

2021 ◽  
Vol 12 ◽  
Author(s):  
Kyoung Jae Kim ◽  
Eric Rivas ◽  
Brian Prejean ◽  
Dillon Frisco ◽  
Millennia Young ◽  
...  
Keyword(s):  
Exercise Intensity ◽  
Exercise Test ◽  
Visual Analysis ◽  
Ventilatory Threshold ◽  
Optimization Method ◽  
Compensation Point ◽  
Metabolic Demand ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation ◽  
Computerized Method

Introduction: The ventilatory threshold (named as VT1) and the respiratory compensation point (named as VT2) describe prominent changes of metabolic demand and exercise intensity domains during an incremental exercise test.Methods: A novel computerized method based on the optimization method was developed for automatically determining VT1 and VT2 from expired air during a progressive maximal exercise test. A total of 109 peak cycle tests were performed by members of the US astronaut corps (74 males and 35 females). We compared the automatically determined VT1 and VT2 values against the visual subjective and independent analyses of three trained evaluators. We also characterized VT1 and VT2 and the respective absolute and relative work rates and distinguished differences between sexes.Results: The automated compared to the visual subjective values were analyzed for differences with t test, for agreement with Bland–Altman plots, and for equivalence with a two one-sided test approach. The results showed that the automated and visual subjective methods were statistically equivalent, and the proposed approach reliably determined VT1 and VT2 values. Females had lower absolute O2 uptake, work rate, and ventilation, and relative O2 uptake at VT1 and VT2 compared to men (p ≤ 0.04). VT1 and VT2 occurred at a greater relative percentage of their peak VO2 for females (67 and 88%) compared to males (55 and 74%; main effect for sex: p < 0.001). Overall, VT1 occurred at 58% of peak VO2, and VT2 occurred at 79% of peak VO2 (p < 0.0001).Conclusion: Improvements in determining of VT1 and VT2 by automated analysis are time efficient, valid, and comparable to subjective visual analysis and may provide valuable information in research and clinical practice as well as identifying exercise intensity domains of crewmembers in space.

Perceptually Regulated Exercise Test Allows Determination of V˙O2max and Ventilatory Threshold But Not Respiratory Compensation Point In Trained Runners

2018 ◽  
Vol 39 (04) ◽  
pp. 304-313
Author(s):  
Perrine Truong ◽  
Gregoire Millet ◽  
Boris Gojanovic
Keyword(s):  
Exercise Test ◽  
Ventilatory Threshold ◽  
Compensation Point ◽  
Rating Of Perceived Exertion ◽  
Long Distance ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation ◽  
Graded Exercise Test ◽  
Graded Exercise ◽  
Trained Runners

AbstractThis study aimed to investigate the differences in maximal oxygen uptake (V̇O2max) and submaximal thresholds between a standard graded exercise test (GXT) and a perceptually regulated graded exercise test (PRGXT) in trained runners. Eleven well-trained middle- to long-distance runners performed both tests in a randomized order. PRGXT used incremental “clamps” of rating of perceived exertion (RPE) over 10×1-min stages on an automated treadmill equipped with a sonar sensor allowing them to change their running speed instantly and in a natural way. GXT used fixed 1 km.h−1 increment every minute. Ventilatory threshold (VT) and respiratory compensation point (RCP) were determined using ventilatory equivalents. No differences were found in V̇O2max (68.0 (5.3) vs. 69.5 (5.9) ml·min−1·kg−1, p=0.243), minute ventilation (V̇E) (159.4 (35.0) vs. 162.4 (33.7) l·min−1, p=0.175), heart rate (HR) (188.4 (6.9) vs. 190.7 (5.2) bpm, p=0.254) and speed (21.0 (1.7) vs. 21.1 (2.3) km·h-1, p=0.761) between GXT and PRGXT. At VT, there were no significant differences between GXT and PRGXT for any outcome variables. For 8 of 11 subjects, it was not possible to determine RCP from ventilatory equivalent in PRGXT. GXT appears more relevant for a comprehensive gas analysis in trained runners.

scholarly journals PPeak oxygen uptake differentiates competitive from recreational male surfboard riders

Motricidade ◽  
2018 ◽  
Vol 13 (4) ◽  
pp. 39
Author(s):  
Nuno Almeida ◽  
Joana Reis ◽  
João Beckert ◽  
Miguel Moreira ◽  
Francisco Alves
Keyword(s):  
Oxygen Uptake ◽  
Body Mass ◽  
Power Output ◽  
Aerobic Power ◽  
Ventilatory Threshold ◽  
Peak Oxygen Uptake ◽  
Maximal Aerobic Power ◽  
Compensation Point ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation

The purpose of this study was to verify if competitive performance status was associated to different levels of specific aerobic fitness in Portuguese surfboard riders. Six recreational surfers (age: 32.3±3.1 years; body mass: 73.2±7.8kg; height: 1.75±0.05m) and six competitive international level surfers (age: 25±8.4years; body mass: 68.5±3.8kg; height: 1.74±0.05m) performed a maximal continuous incremental paddling test consisting of two-minute steps starting at 20W, with increments of 10W, for determination of peak oxygen uptake and maximal aerobic power. Ventilatory threshold and respiratory compensation point with corresponding heart rate and power output were also determined. Elite surfers presented higher values for peak oxygen uptake (43.6±7.9 ml.kg-1.min-1) than recreational surfers (31.1±7.4 ml.kg-1.min-1, p=0.01) however, there were no differences (p> 0.05) between groups for maximal aerobic power (elite: 76.6±18.6W; recreational: 76.6±16.6W). No significant differences between the power output at which ventilatory threshold or respiratory compensation point occurred but elite surfers reached ventilation threshold with 22.5±5.8 ml.kg-1.min-1 which was significantly higher than recreational surfers (16±3.7 ml.kg-1.min-1). These findings show that elite surfers have higher values of peak oxygen uptake than recreational surfers which suggest a higher aerobic adaptation that may be related to the different amount of exercise volume undertaken.

scholarly journals EMG breakpoints for detecting anaerobic threshold and respiratory compensation point in recovered COVID-19 patients

2021 ◽  
pp. 102567
Author(s):  
Murillo Frazão ◽  
Paulo Eugênio Silva ◽  
Lucas de Assis Pereira Cacau ◽  
Tullio Rocha Petrucci ◽  
Mariela Cometki Assis ◽  
...  
Keyword(s):  
Anaerobic Threshold ◽  
Compensation Point ◽  
Respiratory Compensation Point ◽  
Respiratory Compensation

Respiratory compensation point

2021 ◽  
pp. 93-96
Author(s):  
William J.M. Kinnear ◽  
James H. Hull
Keyword(s):  
Carbon Dioxide ◽  
Minute Ventilation ◽  
Cardiopulmonary Exercise Test ◽  
Compensation Point ◽  
Respiratory Compensation Point ◽  
Carbon Dioxide Output ◽  
Respiratory Compensation ◽  
Cardiopulmonary Exercise ◽  
The Subject ◽  
Maximal Effort

This chapter describes how acidaemia stimulates ventilation in the later stages of a cardiopulmonary exercise test (CPET). This happens after the anaerobic threshold, once the capacity of the blood to buffer lactic acid has been used up. The respiratory compensation point (RCP) can be identified from an increase in the slope when minute ventilation (VE) is plotted against carbon dioxide output (VCO2), or from a rise in the ventilatory equivalents for carbon dioxide (VeqCO2). The presence of a clear RCP indicates that the subject has made a fairly maximal effort during the CPET. An RCP also argues against significant lung disease, since it implies the ability to increase ventilation in response to acidaemia.

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