title: Venous blood lactate increase after vertical jumping in volleyball athletes.
abstract: The aim of this study was to test the hypothesis that venous blood lactate concentrations ([La-]) would vary from the beginning of brief exercise. Maximal vertical jumping was used as a model of brief intense exercise. Eleven healthy male volleyball players, aged [mean (SE)] 18.5 (0.7) years, performed three exercise tests with different protocols, each separated by quiet seated recovery periods of 45 min. After the first test, consisting of a single maximal jump [lasting approximately equals 0.6 s for the pushing phase, and in which the subjects jumped 64 (2.2) cm], forearm venous [La-] increased significantly with respect to rest at 1 min (t1), 3 min (t3), and 5 min (t5) of recovery. The second test, comprising six maximal jumps, each separated by 20-s recovery periods, resulted in an unchanged [La-] with respect to the baseline value. After the third test [i.e., six consecutive maximal jumps that lasted a total of 7.36 (0.33) s], [La-] increased significantly at t3 and t5 with respect to the pre-test value (F= 10.3, P < 0.001). We conclude that a significant venous [La-] increase occurs after vertical jumping. This result may be explained by the activation of lactic anaerobic metabolism at the very onset of exercise, which participates in energy production and/or in the resynthesis of the phosphocreatine that was used during such brief exercise.
authors.affiliation: Laboratoire de Recherche APS et Conduites Motrices: Adaptations-Réadaptations, Faculté des Sciences du Sport, Amiens, France.
authors.forename: K
authors.initials: K
authors.lastname: Chamari
authors.forename: S
authors.initials: S
authors.lastname: Ahmaidi
authors.forename: J Y
authors.initials: JY
authors.lastname: Blum
authors.forename: O
authors.initials: O
authors.lastname: Hue
authors.forename: A
authors.initials: A
authors.lastname: Temfemo
authors.forename: C
authors.initials: C
authors.lastname: Hertogh
authors.forename: B
authors.initials: B
authors.lastname: Mercier
authors.forename: C
authors.initials: C
authors.lastname: Préfaut
authors.forename: J
authors.initials: J
authors.lastname: Mercier
mesh_terms: D000293:Adolescent; D000328:Adult; D015308:Anaerobic Threshold / Q000502:physiology*; D001132:Arm / Q000502:physiology; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D007866:Leg / Q000502:physiology; D008124:Locomotion / Q000502:physiology*; D008297:Male; D013177:Sports; D014680:Veins
chemical_list: D019344:Lactic Acid