title: 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 sessions of long-sprint training. Nine subjects performed before and after training (1) a 300-m test, (2) an incremental exercise up to exhaustion to determine the velocity associated with maximal oxygen uptake (v-VO(2max)), (3) a 70-s constant exercise at intensity halfway between the v-VO(2max) 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: [Formula: see text], 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.
authors.affiliation: Laboratoire de Biomécanique et de Physiologie, Mission Recherche, Institut National des Sports et de l'Education Physique (INSEP), 11 avenue du Tremblay, 75012 Paris, France. claire.thomas@univ-evry.fr
authors.forename: Claire
authors.initials: C
authors.lastname: Thomas
authors.forename: Olivier
authors.initials: O
authors.lastname: Bernard
authors.forename: Carina
authors.initials: C
authors.lastname: Enea
authors.forename: Chadi
authors.initials: C
authors.lastname: Jalab
authors.forename: Christine
authors.initials: C
authors.lastname: Hanon
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D006801:Humans; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology*; D010809:Physical Fitness / Q000502:physiology*; D015656:Respiratory Mechanics / Q000502:physiology*; D012420:Running / Q000502:physiology*
chemical_list: D019344:Lactic Acid