Between-day variablity of VO2, VCO2 and heart rate for variable work rate


Measurements of VO2, VCO2 and heart rate are central to methods for assessment of physical fitness and endurance capabilities in athletes. The aim of this study is to quantify the between-day variablity of VO2, VCO2 and heart rate measurements during ergometer tests with variable work rate.


  • Design suitable ergometer test protocols with variable work rate.
  • Perform ergometer tests.
  • Data analysis. 


Knowlegde of ergospirometry is of advantage.


  1. McCrory, M. A., Mole, P. A., Nommsen-Rivers, L. A., & Dewey, K. G. (1997). Between-day and within-day variability in the relation between heart rate and oxygen consumption: effect on the estimation of energy expenditure by heart-rate monitoring. The American journal of clinical nutrition66(1), 18-25.
  2. Becque, M. D., Katch, V., Marks, C., & Dyer, R. (1993). Reliability and within subject variability of VE, VO2, heart rate and blood pressure during submaximum cycle ergometry. International journal of sports medicine14(04), 220-223.
  3. de Tarso Müller, P., Christofoletti, G., Zagatto, A. M., Paulin, F. V., & Neder, J. A. (2015). Reliability of peak O 2 uptake and O 2 uptake kinetics in step exercise tests in healthy subjects. Respiratory physiology & neurobiology207, 7-13.


Alexander Artiga Gonzalez