Metabolic and respiratory adaptations during intense exercise following long- sprint training of short duration

Abstract : This study aimed to determine metabolic and respiratory adaptations during intense exercise and improvement of long-sprint performance following six ses- sions of long-sprint training. Nine subjects performed before and after training (1) a 300-m test, (2) an incremental exer- cise up to exhaustion to determine the velocity associated with maximal oxygen uptake (v-VO2max), (3) a 70-s constant exercise at intensity halfway between the v-VO2max and the velocity performed during the 300-m test, followed by a 60-min passive recovery to determine an individual blood lactate recovery curve fitted to the bi-exponential time function: LaðtÞ ¼ Lað0Þ þ A1ð1 - e-c1 Þþ A2ð1 - e-c2 Þ, and blood metabolic and gas exchange responses. The training program consisted of 3–6 repetitions of 150–250 m interspersed with rest periods with a duration ratio superior or equal to 1:10, 3 days a week, for 2 weeks. After sprint training, reduced metabolic disturbances, characterized by a lower peak expired ventilation and carbon dioxide output, in addition to a reduced peak lactate (P \ 0.05), was observed. Training also induced significant decrease in the net amount of lactate released at the beginning of recovery (P \ 0.05), and significant decrease in the net lactate release rate (NLRR) (P \ 0.05). Lastly, a significant improvement of the 300-m performance was observed after training. These results suggest that long-sprint training of short durations was effective to rapidly prevent metabolic disturbances, with alterations in lactate accumulation and gas exchange, and improvement of the NLRR. Furthermore, only six long- sprint training sessions allow long-sprint performance improvement in active subjects.
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Article dans une revue
European Journal of Applied Physiology, Springer Verlag, 2012, 112 (2), pp.667-675
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Claire Thomas, Olivier Bernard, Carina Enea, Chadi Jalab, Christine Hanon. Metabolic and respiratory adaptations during intense exercise following long- sprint training of short duration. European Journal of Applied Physiology, Springer Verlag, 2012, 112 (2), pp.667-675. 〈hal-01587678〉

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