Relationships between postcompetition blood lactate concentration and average running velocity over 100-m and 200-m races |
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Authors: | C A Hautier D Wouassi L M Arsac E Bitanga P Thiriet J R Lacour |
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Institution: | (1) Laboratoire de Physiologie - GIP exercise, Faculté Médecine Lyon-Sud, BP 12, F-69921 Oullins Cedex, France;(2) Département de Biologie de l'Activité Physique, Institut National de la Jeunesse et des Sports Yaoundé, Cameroon, France;(3) UFR-STAPS, Université Lyon I, F-Lyon, France |
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Abstract: | The relationships between anaerobic glycolysis and average velocity ( ) sustained during sprint running were studied in 12 national level male sprinters. A blood sample was obtained within 3 min of the completion of semi-finals and finals in the 100-m and 200-m Cameroon national championships and blood lactate concentration (la–]b) was measured. The 35-m times were video-recorded. The 100-m and 200-m la–]b were 8.5 (SD 0.8) and 10.3 (SD 0.8) mmol·l–1, respectively. These were not correlated with the performances. Over 200 m la–]b was correlated with the sustained over the last 165 m (r=0.65,P<0.05). In the 9 athletes who participated in both the 100-m and 200-m races, the difference between the la–]b measured at the end of the two races was negatively correlated to the difference in v sustained over the two races (r=0.76,P>0.02). Energy expenditure during sprint running was estimated from the la–]b values. This estimate was mainly based on the assumption that a 1 mmol·l–1 increase in la–]b corresponds to the energy produced by the utilization of 3.30 ml O2·kg–1. The energy cost of running was estimated at 0.275 (SD 0.02) ml O2·kg–1·m–1 over 200-m and 0.433 (SD 0.03) ml O2·kg–1·m–1 over 100-m races. These results would suggest that at the velocities studied anaerobic glycolysis contributes to at least 55% of the energy expenditure related to sprint running. However, the influence of both mechanical factors and the contribution of other energy processes obscure the relationship between la–]b and performance. |
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Keywords: | Sprint running Blood lactate Performance Energy cost of running |
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