Thus many debateable issues contribute to the debate concerning the se of BL as a valid and reproducible physiological test to predict endurance performance. Timing (Myburgh et al,2000) design (Foxdal et al 1994) and intensity (Palmer et al,1999) coupled with sampling, analysis and calculation issues (Foxdal et al 1994) compound the spurious nature for inference. Albrecht (1998) used rating of perceived exertion and performance results to conclude that BL was a more favourable LT test than Heart Rate, as HR fails to provide an accurate physiological profile in response to exercise intensity testing. Nevertheless the results of BL for specific exercising muscle mass is questioned due to the variant designs and the underlying physiological responses of the lactate shuttle within fibres and less active skeletal muscle. Such response may underestimate the circulating levels of BL and therefore inferences on how much lactate is produced peripherhally and locally by muscle. Hence athletes can improve endurance performance by targetting optimal training intensities, with adequate recovery periods, depending on the system to be overloaded.
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