文章基本信息

标题：A simplification of the Stewart equation to determine acid-base status in exercise
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作者：Peinado, A.B., Díaz, V. ; Benito, P.J. ; Álvarez, M. y Calderón, F.J. 等
期刊名称：Revista international de medicina y ciencias de la actividad fisica y del deporte
印刷版ISSN：1577-0354
出版年度：2011
卷号：11
期号：41
页码：115-126
出版社：CV Ciencias del Deporte RedIRIS
摘要：The aim of the present study was to simplify the Stewart equation and to test the validity of the proposed form. Twenty-four men performed a constant load exercise test for 30 min on a treadmill. Capillary blood samples were taken at rest, and again 10, 20 and 30 min into the test. Acid-base variables were measured using a blood-gas analyser and lactate levels were measured enzymatically. The [H+] was calculated using the Stewart equation: A[H+]4+B[H+]3+C[H+]2+D[H+]+E=0, and using a proposed, simplified version of this equation: A[H+]2+B[H+]+C=0. The difference in the mean [H+] results obtained with the two equations was 0.004 nmol·L-1. However, the difference between the means of the equation-derived results and the measured values was highly significant at >8 nmol·L-1 (p<0.001). The proposed equation can be used to estimate [H+] instead of the full Stewart equation, although the values obtained are significantly different to those actually measured.
关键词：KEY WORDS: acid-base equilibrium;constant load;hydrogen ion;lactate;strong ions.