... However some of the studies have shown limitations. For example, "the studies by Weltman et al. (1990) used only male subjects, did not standardise diet or prior physical activity, and performed little statistical analysis" (Grant et al. 2001). Pfitzinger and Freedson (1998) did standardise diet and physical activity, however there were short comings in their statistical data. In 1990 a reproducibility study (Weltman et al.) was conducted using paired students t-tests and correlation coefficients to compare results their tests. However, there is no random variation between tests and correlation coefficients are not systematically biased. Grant et al. (2001) also suggests, "The result can be influenced by the range of values in the sample". The purpose of this study was to investigate the relationships between an athlete's speed (at the 4mM blood lactate concentration) during an incremental test and a 10 km time trial, also an attempt to determine a correlation between ...

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