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, Dans ce contexte, plusieurs études ont été réalisées : La première étude compare l'influence d'un 750 m de natation sollicitant soit les bras, soit les jambes, soit les bras et les jambes sur la dépense énergétique lors d'un exercice subséquent de 15 min de cyclisme. Le principal résultat montre que la sollicitation préalable des bras uniquement n'entraîne aucune variation significative des paramètres physiologiques mesurés en cyclisme, Résumé Ce travail a pour objectif d'étudier les adaptations physiologiques et biomécaniques au cours des enchaînements natation-cyclisme et cyclisme-course à pied d'un triathlon

, La deuxième et la troisième étude s'intéressent à l'influence d'une diminution de l'intensité relative de la nage au cours d'un 750 m, soit par le port d'une combinaison

, et d'autre part que les effets combinés du port de combinaison et du drafting entraînent une augmentation supplémentaire du rendement de 4,8%. La quatrième étude a pour objectif d'analyser l'influence de la cadence de pédalage sur l'adaptation physiologique lors d'un enchaînement natation-cyclisme. Le principal résultat indique que la dépense énergétique en cyclisme est significativement inférieure lors d'un enchaînement natation-cyclisme (1500m30min) réalisé à une cadence proche de la cadence énergétiquement optimale (75 rév.min-1 ) comparativement à une cadence proche de la cadence classiquement adoptée par les triathlètes en compétition (95 rév.min-1 ). Ces résultats soulignent l'influence d'une épreuve préalable de natation de courte distance sur la dépense énergétique en cyclisme, Les résultats montrent d'une part que le port de combinaison permet d'améliorer le rendement mécanique du cyclisme de 12%

, L'objectif de notre second travail lié à l'enchaînement cyclisme-course à pied était d'étudier, les critères qui déterminent le choix de la cadence de pédalage et les conséquences de ce choix sur a) l'adaptation en cyclisme avec la durée de l'exercice et b) l'adaptation en course à pied (Càp) lors d'un enchaînement cyclisme-course à pied. Notre principale expérimentation a étudié l

, CEO = 72 rpm ; 90 rpm = optimum mécanique théorique) sur l'adaptation lors de la Càp subséquente. Le principal résultat met en évidence que le choix d'une CEO induit une réduction de

, lors du cyclisme (30-min) et de la Càp (15-min) comparativement aux autres conditions expérimentales

, Le principal résultat ne montre aucune influence significative de la cadence sur la performance. Cependant, un effet différencié de la cadence est observé sur les réponses ventilatoires et cinématiques lors de la Càp subséquente. Nos résultats suggèrent que le choix de la cadence en triathlon peut influencer l'adaptation physiologique du sujet lors de l'enchaînement cyclisme-Càp, Suite à ces résultats, l'objectif de la troisième étude est d'analyser l'effet de 3 cadences différentes, vol.60