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對數轉換和連續指數模式測定乳酸閾值的比較研究

A Comparative Study of the Logarithm Transformation Model and the Continuous Transformation Model in Measuring Lactate Threshold

摘要


The present study examines the feasibility of and differences in measurement of oxygen uptake via lactate threshold using two different methods: the logarithm transformation model and the continuous transformation model. Subjects were eight males form Taipei Teachers’ College Department of Physical Education (age=22.10+/-0.82 years, height=177.10+/-2.92cm; weight=71.66+/-5.74 kg) who submitted to lactate threshold measurements after MacDougall et al. During exercise, blood samples were drawn form the antecubital vein for use as samples in analyzing lactate concentration. The data thus obtained were analyzed using mathematical modeling to determine the oxygen uptake corresponding to an ideal lactate threshold value, and analyzed with t-tests and ANOVA. Results are as follow: 1. The difference between oxygen uptake values obtained through lactate thresholds for logarithm transformation and continuous transformation was not statistically significant (P>.05). 2. The confidence interval for determination of oxygen uptake using lactate threshold through continuous transformation was R=.91. 3. The confidence interval for determination of oxygen uptake using lactate threshold through continuous transformation was R=.95 Based on the preceding results, the following conclusions are obtained: 1. There is no statistically significant difference between oxygen uptake values obtained through lactate thresholds for logarithm transformation and continuous transformation. 2. Logarithm transformation and continuous transformation methods are both reliable and are suitable for promotion and use within Taiwan.

並列摘要


The present study examines the feasibility of and differences in measurement of oxygen uptake via lactate threshold using two different methods: the logarithm transformation model and the continuous transformation model. Subjects were eight males form Taipei Teachers’ College Department of Physical Education (age=22.10+/-0.82 years, height=177.10+/-2.92cm; weight=71.66+/-5.74 kg) who submitted to lactate threshold measurements after MacDougall et al. During exercise, blood samples were drawn form the antecubital vein for use as samples in analyzing lactate concentration. The data thus obtained were analyzed using mathematical modeling to determine the oxygen uptake corresponding to an ideal lactate threshold value, and analyzed with t-tests and ANOVA. Results are as follow: 1. The difference between oxygen uptake values obtained through lactate thresholds for logarithm transformation and continuous transformation was not statistically significant (P>.05). 2. The confidence interval for determination of oxygen uptake using lactate threshold through continuous transformation was R=.91. 3. The confidence interval for determination of oxygen uptake using lactate threshold through continuous transformation was R=.95 Based on the preceding results, the following conclusions are obtained: 1. There is no statistically significant difference between oxygen uptake values obtained through lactate thresholds for logarithm transformation and continuous transformation. 2. Logarithm transformation and continuous transformation methods are both reliable and are suitable for promotion and use within Taiwan.

參考文獻


Beaver, W. L.,Wasserman, K.,Whip, B. J.(1985).Improved detection of lactate threshold during exercise using a log-log transformation.Journal of Applied Physiology.59(6)
Campbell M. E.,Hughson, R. L.,Green. H. J..Continuous increase in blood lactate concentration during different ramp exercise protocols.Journal of Applied Physiology.66(3)
Davis, J. A.,Caiozzo, V. J.,Lamarra, N.,Ellis, J. F.,Vandagriff, R.,Prietts, C.A.,McMaster, W. C.(1983).Does the gas exchange anaerobic threshold occur at a fixed blood lactate concentration or 2 or 4 mM?.International Journal of Sports Medicine.4(2)
Hughson, R. L.,Weisger, K. H.,Swanson, G. D.(1987).Blood lactate concentration increases as a continuous function in progressive exercise.Journal of Applied Physiology.62(5)
Myers, J. D.,Walsh, N.,Buchanan, P.,Mcauley, E.,Bowes,Froelicher, V.(1994).Increase in blood lactate during ramp exercise: comparison of continuous and thresbold models.Medicine and Science in Sports and Exercise.26(11)

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