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The aim of the present investigation was to describe the development of endurance performance between 2006 and 2008 in paraplegic wheelchair racing athletes competing at the Paralympic Games 2008 based on a heart rate-based lactate minimum test (LMT). For this purpose data of two standardised LMTs performed in 2006 and 2008 were compared in seven (4m/3f) world-class wheelchair racing athletes and correlated with individual competitive marathon racing times. Analysis included values for top speed, peak heart rate, peak lactate concentration as well as speed, heart rate and lactate concentration at lactate minimum. Significant improvements in speed at lactate minimum (9.5±3.9%, P<0.001) as a reliable predictor of maximal lactate steady-state as well as in top speed (7.3±6.8%, P=0.007) were found, whereas all other parameters showed no significant differences between measurements in 2006 and 2008. Seasonal best average marathon racing speed significantly correlated with speed at lactate minimum (r=0.824, P=0.004) and top speed (r=0.896, P<0.001) determined by means of the heart rate based LMT. In conclusion, even in well trained athletes impressive performance improvements can be achieved over a two year training period. The heart rate-based LMT seems to be a valuable and reliable tool to monitor such improvements in endurance performance in top-class wheelchair racing athletes and may be used for prediction of individual marathon racing times in the future.
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