title: Energy-System Contributions to Simulated Judo Matches.
abstract: OBJECTIVE
  To estimate the contribution of the 3 energy systems to simulated judo matches.
  
  
  METHODS
  Twelve judo athletes (18 ± 1 y, 175.1 ± 5.3 cm, 74.3 ± 10.5 kg, 11.7% ± 1.5% body fat, 8 ± 2 y of practice) performed 5 combats with different durations (1, 2, 3, 4, and 5 min), against the same opponent, on different days and blinded to the duration. The estimated energy contributions for the oxidative, glycolytic, and ATP-PCr systems were calculated based on oxygen uptake (V̇O2) during activity, Delta of lactate, and the fast phase of excess V ̇ O2, respectively. Analysis of mixed models for repeated measures was used to compare the contribution of the 3 energy systems and different durations of judo matches, followed by a post hoc Bonferroni test.
  
  
  RESULTS
  The oxidative system's contribution (70%) was higher than those of the glycolytic (8%; P < .001) and ATP-PCr (21%; P < .001) energy systems (in all durations), and the ATP-PCr contribution was higher than that of the glycolytic energy system (up to 3 min). In addition, during the match there was an increase in the oxidative (from 50% to 81%; P < .001), a decrease in the ATP-PCr (from 40% to 12%; P < .001), and maintenance of the glycolytic contributions (between 6% and 10%).
  
  
  CONCLUSIONS
  There is a predominance of the oxidative system to supply the energy cost of judo matches from the first minute of combat up to the end, compared with the anaerobic systems.
authors.forename: Ursula F
authors.initials: UF
authors.lastname: Julio
authors.forename: Valéria L G
authors.initials: VLG
authors.lastname: Panissa
authors.forename: João V
authors.initials: JV
authors.lastname: Esteves
authors.forename: Rubiana L
authors.initials: RL
authors.lastname: Cury
authors.forename: Marcus F
authors.initials: MF
authors.lastname: Agostinho
authors.forename: Emerson
authors.initials: E
authors.lastname: Franchini
mesh_terms: D000293:Adolescent; D003163:Competitive Behavior / Q000502:physiology*; D004734:Energy Metabolism / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D016139:Martial Arts / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology; D010465:Perception; D005082:Physical Exertion / Q000502:physiology; D013996:Time and Motion Studies
chemical_list: D019344:Lactic Acid
keywords: blood lactate; combat sports; oxygen consumption; rating of perceived exertion; time–motion