Gas Exchange Ventilatory Threshold

 For the analysis of gas-exchange data and the determination of the gas-exchange ventilatory threshold, we have developed WinBreak 3.7, a professional tool that provides far greater flexibility than the proprietary automated algorithms that are built into commercial metabolic analysis software packages (watch this video). 

V-slope Module


Excess CO2 Module


Some of the features of WinBreak 3.7 include:

  • Three graphical modules: V-slope (VCO2 by VO2), ventilatory equivalents, and excess CO2. Module for inter-method comparisons.
  • Choice of five validated algorithms for the V-slope: (a) Jones & Molitoris (1984), Orr et al. (1982), Beaver et al. (1986), Cheng et al. (1992), Sue et al. (1988). The standard Jones & Molitoris (1984) algorithm is used for the ventilatory equivalents, and excess CO2 modules. Complete computational reports for each algorithm.
  • Module for determining the respiratory compensation point (RC) based on VE by VCO2 (following Beaver et al., 1986).
  • Plots of residuals of the single-regression and two-regression solutions.
  • Powerful data processing: averaging, interpolation, outlier removal, five smoothing methods (running average, Savitzky-Golay, low-pass FFT, cubic spline, polynomial regressions from 2nd to 10th order).
  • Fully customizable graphs, can be saved as metafiles or bitmaps.
  • Extensive context-sensitive help system.
  • Detailed 78-page user guide.
  • Can be customized to read ASCII data from any metabolic analysis software package. Saves data in ASCII and ExcelTM formats.

Illustrative Publications

  • Ekkekakis, P., Lind, E., Hall, E.E., & Petruzzello, S.J. (2008). Do regression-based computer algorithms for determining the ventilatory threshold agree? Journal of Sports Sciences, 26(9), 967-976. [DOI] [PubMed]

  • Zenko, Z., & Ekkekakis, P. (2019). Internal consistency and validity of measures of automatic exercise associations. Psychology of Sport and Exercise, 43, 4-15. [DOI]

  • Zenko, Z., Ekkekakis, P., & Ariely, D. (2016). Can you have your vigorous exercise and enjoy it too? Ramping intensity down increases postexercise, remembered, and forecasted pleasure. Journal of Sport and Exercise Psychology, 38(2), 149-159. [DOI] [PubMed]