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A systems model approach to the ventilatory anaerobic threshold

  • R. Hugh Morton
  • Gregory C. Gass
Article

Summary

An analogue systems model of whole-body human bioenergetics predicts a change in kinetics of\(\dot V_{{\text{O}}_{{\text{ 2}}} } \) time series values as a result of exercise levels above an anaerobic threshold. Plotted\(\dot V_{{\text{O}}_{{\text{ 2}}} } \) results from exercising subjects appear to confirm this change. The purpose of this study is to describe the background to the systems model analogue of the anaerobic threshold and a test procedure devised to estimate this threshold. The estimate so obtained has the dual advantages of being based on model theory and of not being subject to the sort of ambient variations inherent in a single-test determination. A non-homogeneous group of eight subjects comprising a full replicate of a 23 factorial experimental design, with factors age, sex and training status, took part in the study. On one hand the results indicate acceptance of the systems model theory. On the other, the analogue threshold measure possesses corresponding properties to the conventional anaerobic threshold. It is higher for trained (155–214 W) than for untrained subjects (108–158 W), higher for males (149–214 W) than for females (108–170 W), and displays no evident interaction effects. Results for the\(\dot V_{{\text{O}}_{{\text{ 2}}} } \) time constant and for the work efficiency, display similar effects except for an interaction in the latter between age and training status. These experimental findings are regarded as confirmatory of the nature of the analogue threshold measure.

Key words

Anaerobic function Cycle ergometer Energy equivalent Exercise test Factorial experiment Maximum power Oxygen uptake Time constant Work efficiency 

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References

  1. Astrand PO, Rodahl K (1977) Textbook of Work Physiology (2Ed). McGraw-Hill, New YorkGoogle Scholar
  2. Box GEP, Hunter WG, Hunter JS (1977) Statistics for experimenters. Wiley, New YorkGoogle Scholar
  3. Brooks GA (1985) Anaerobic threshold: review of the concept and directions for future research. Med Sci Sports Exerc 17:22–31Google Scholar
  4. Davis JA (1985) Anaerobic threshold: review of the concept and directions for future research. Med Sci Sports Exerc 17:6–18Google Scholar
  5. Davis JA, Vodak P, Wilmore JH, Vodak J, Kurtz P (1976) Anaerobic threshold and maximal aerobic power for three modes of exercise. J Appl Physiol 41:544–550Google Scholar
  6. Davis JA, Frank MH, Whipp BJ, Wasserman K (1979) Anaerobic threshold alterations caused by endurance training in middle aged men. J Appl Physiol 46:1039–1046Google Scholar
  7. Hagan RD, Smith MG (1984) Pulmonary ventilation in relation to oxygen uptake and carbon dioxide production during incremental load work. Int J Sports Med 5:193–197Google Scholar
  8. Hughson RL, Inman MD (1986) Oxygen uptake kinetics from ramp work tests: variability of single test values. J Appl Physiol 61:373–376Google Scholar
  9. Hughson RL, Morrissey M (1983) Delayed kinetics of respiratory gas exchange in the transition from prior exercise. Evidence for O2 transport limitation of\(\dot V_{{\text{O}}_{{\text{ 2}}} } \) kinetics: A review. Int J Sports Med 4:31–39Google Scholar
  10. Kindermann WG, Simon G, Keul J (1979) The significance of the aerobic/anaerobic transition for the determination of workload intensites during endurance training. Eur J Appl Physiol 42:25–34Google Scholar
  11. Margaria R (1976) Biomechanics and energetics of muscular exercise. Oxford University Press, OxfordGoogle Scholar
  12. McDougal J (1978) The anaerobic threshold: Its significance for the endurance athlete. Can J Appl Sports Sci 2:137–140Google Scholar
  13. Morton RH (1985a) Two-dimensional short-term model of oxygen uptake kinetics. J Appl Physiol 58:1736–1740Google Scholar
  14. Morton RH (1985b) On a model of human bioenergetics. Eur J Appl Physiol 54:285–290Google Scholar
  15. Morton RH (1986a) On a model of human bioenergetics II: Maximal power and endurance. Eur J Appl Physiol 55:413–418Google Scholar
  16. Morton RH (1986b) A three component model of human bioenergetics. J Math Biol 24:451–466Google Scholar
  17. Orr GW, Green HJ, Hughson RL, Bennett GW (1982) A computer regression model to determine ventilatory anaerobic threshold. J Appl Physiol 52:1349–1352Google Scholar
  18. Reinhart U, Muller PH, Schmulling RM (1979) Determination of anaerobic threshold by the ventilation equivalent in normal individuals. Respiration 38:36–42Google Scholar
  19. Stuart MK, Howley ET, Gladden BL, Cox RH (1981) Efficiency of trained subjects differing in maximal oxygen uptake and type of training. J Appl Physiol 50:444–449Google Scholar
  20. Skinner JS, McLellan TM (1980) The transition from aerobic to anaerobic metabolism. Res Q Exerc Sport 51:234–248Google Scholar
  21. Volkov NI (1966) The creation of a mathematical model of the processes of energy metabolism during muscular activity. Theory Pract Physical Cult USSE 5:37–43Google Scholar
  22. Wasserman K, McIlroy MB (1964) Detecting the threshold of anaerobic metabolism in cardiac patients during exercise. Am J Cardiol 14:844–852Google Scholar
  23. Weltman A, Katch VL (1979) Relationship between the onset of metabolic acidosis (anaerobic threshold) and maximal oxygen uptake. J Sports Med Physiol Fit 19:135–142Google Scholar
  24. Whipp BJ, Davis JA, Torres F, Wasserman K (1981) A test to determine parameters of aerobic function during exercise. J Appl Physiol 50:217–221Google Scholar

Copyright information

© Springer-Verlag 1987

Authors and Affiliations

  • R. Hugh Morton
    • 1
  • Gregory C. Gass
    • 2
  1. 1.Mathematics and Statistics DepartmentMassey UniversityPalmerston NorthNew Zealand
  2. 2.Department of Biological SciencesCumberland College of Health SciencesLidcombeAustralia

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