Statistical evidence consistent with two lactate turnpoints during ramp exercise

  • R. H. Morton
  • Y. Fukuba
  • E. W. Banister
  • M. L. Walsh
  • C. T. C. Kenny
  • B. J. Cameron
Article

Abstract

A number of studies have identified the existence of two ventilation thresholds during ramp or incremental exercise to exhaustion on the cycle ergometer. This study was undertaken to investigate whether two threshold turnpoints could be identified in blood lactate concentration data collected at such times. Five trained athletes provided serial blood samples on several occasions each during a 3-month period of training. Blood lactate concentration was analysed by fitting models with no, one or two turnpoints. Ordinary residuals from the first two models were often found to exhibit an oscillatory behaviour consistent with the existence of two turnpoints in lactate concentration. A comparative analysis of goodness of fit of these models revealed that the model with two turnpoints was significantly better than either of the simpler models. This suggests that two transitions exist, which divide the time domain for blood lactate concentration in ramp exercise into three regions. These two transitions may correspond to the two ventilation thresholds.

Key words

Anaerobic threshold Incremental exercise Onset of blood lactate accumulation 

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References

  1. Anderson GS, Rhodes EC (1989) A review of blood lactate and ventilatory methods of detecting transition thresholds. Sports Med 8:43–55PubMedGoogle Scholar
  2. Beaver WL, Wasserman K, Whipp BJ (1985) Improved detection of lactate threshold during exercise using a log-log transformation. J Appl Physiol 59:1936–1940PubMedGoogle Scholar
  3. Beaver WL, Wasserman K, Whipp BJ (1988) Blood lactate concentration in exercise. J Appl Physiol 64:1290–1291PubMedGoogle Scholar
  4. Brooks GA (1985) Anaerobic threshold: review of the concept and directions for future research. Med Sci Sports Exerc 17:22–31PubMedGoogle Scholar
  5. Cabrera ME, Chizeck HJ (1992) Dynamics of lactate and oxygen uptake during exercise. Physiologist 35:233Google Scholar
  6. Casaburi R, Barstow TJ, Robinson T, Wasserman K (1989) Influence of work rate on ventilatory and gas exchange kinetics. J Appl Physiol 67:547–555PubMedGoogle Scholar
  7. Davis HA, Gass GC (1981) The anaerobic threshold as determined before and during lactic acidosis. Eur J Appl Physiol 47:141–149CrossRefGoogle Scholar
  8. Davis HA, Bassett J, Hughes P, Gass GC (1983) Anaerobic threshold and lactate turnpoint. Eur J Appl Physiol 50:383–392CrossRefGoogle Scholar
  9. Davis JA (1985) Anaerobic threshold: review of the concept and directions for future research. Med Sci Sports Exerc 17:6–18PubMedGoogle Scholar
  10. Dennis SC, Noakes TD, Bosch AN (1992) Ventilation and blood lactate increase exponentially during incremental exercise. J Sports Sci 10:437–449PubMedGoogle Scholar
  11. Fukuba Y, Usui S, Munaka M (1989) New mathematical modelling of blood lactate kinetics during ramp mode exercise in man. Jpn J Physiol 39:325–334PubMedGoogle Scholar
  12. Green HJ, Hughson RL, Orr GW, Ranney DA (1983) Anaerobic threshold, blood lactate and muscle metabolites in progressive exercise. J Appl Physiol 54:1032–1038PubMedGoogle Scholar
  13. Hughson RL, Swanson GD (1988) Blood lactate concentration in exercise. J Appl Physiol 64:1291Google Scholar
  14. Hughson RL, Weisiger KH, Swanson GD (1987) Blood lactate concentration increases as a continuous function in progressive exercise. J Appl Physiol 62:1975–1981PubMedGoogle Scholar
  15. Hsu JC (1984) Constrained two-sided simultaneous confidence interval for multiple comparisons with the best. Ann Stats 12:61–75Google Scholar
  16. Kindermann W, Simon G, Keul J (1979) The significance of the aerobic-anaerobic transition for the determination of work load intensities during endurance training. Eur J Appl Physiol 42:25–34CrossRefGoogle Scholar
  17. McLellan TM (1985) Ventilatory and plasma lactate response with different exercise protocols: a comparison of methods. Int J Sports Med 6:30–35PubMedGoogle Scholar
  18. McLellan TM (1987) The anaerobic threshold: concept and controversy. Aust J Sci Med Sports 19:3–8Google Scholar
  19. Mortimore IL, Reed JW (1982) Prediction of maximal oxygen uptake from submaximal blood lactate concentration. J Physiol (Lond) 338:73PGoogle Scholar
  20. Morton RH (1989) Detection of a lactate threshold during incremental exercise? J Appl Physiol 67:885–888PubMedGoogle Scholar
  21. Morton RH (1993) Comment on ‘Ventilation and blood lactate increase exponentially during incremental exercise’. J Sports Sci 11:371–375PubMedGoogle Scholar
  22. Peronnet F, Morton RH (1994) Plasma lactate concentration increases as a parabola with delay during ramp exercise. Eur J Appl Physiol 68:228–233Google Scholar
  23. Reed JW, Parker J (1989) Lactate balance during low levels of exercise. In: Swanson GD, Grodins FS, Hughson RL (eds) Respiratory control: a modelling perspective. Plenum Press, New York, pp 165–170Google Scholar
  24. Schwaberger G, Pessenhofer H, Schmid P (1982) Anaerobic threshold: physiological significance and practical use. In: Kenner T, Buse R, Hinghefer-Szalkay H (eds) Cardiovascular system dynamics: models and measurements. Plenum Press, New York, pp 561–567Google Scholar
  25. Skinner JS, McLellan TM (1980) The transition from aerobic to anaerobic metabolism. Res Q Exerc Sport 51:234–248PubMedGoogle Scholar
  26. Stegmann H, Kindermann W, Schnabel A (1981) Lactate kinetics and individual anaerobic threshold. Int J Sports Mod 2:160–165Google Scholar
  27. Tokmakidis SP, Leger LA (1992) Comparison of mathematically determined blood lactate and heart rate “threshold” points and relationships with performance. Eur J Appl Physiol 64:309–317Google Scholar
  28. Walsh ML, Banister EW (1988) Possible mechanisms of the anaerobic threshold: a review. Sports Mod 5:269–302Google Scholar
  29. Wasserman K, Beaver WL, Whipp BJ (1986) Mechanisms and patterns of blood lactate increase during exercise in man. Med Sci Sports Exerc 18:344–352PubMedGoogle Scholar
  30. Yeh MP, Gardner RM, Adams TD, Yanowitz F, Crapo RO (1983) “Anaerobic threshold”: problems of determination and validation. J Appl Physiol 55:1178–1186PubMedGoogle Scholar

Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • R. H. Morton
    • 1
  • Y. Fukuba
    • 2
  • E. W. Banister
    • 3
  • M. L. Walsh
    • 3
  • C. T. C. Kenny
    • 4
  • B. J. Cameron
    • 3
  1. 1.Department of StatisticsMassey UniversityPalmerston NorthNew Zealand
  2. 2.Department of BiometricsResearch Institute for Nuclear Medicine and Biology, Hiroshima UniversityJapan
  3. 3.School of Kinesiology, Simon Fraser UniversityBurnabyCanada
  4. 4.Royal New Zealand Naval HospitalAucklandNew Zealand

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