title: Movement Patterns and Metabolic Responses During an International Rugby Sevens Tournament.
abstract: OBJECTIVE
  To investigate the running demands and associated metabolic perturbations during an official rugby sevens tournament.
  
  
  METHODS
  Twelve elite players participated in 7 matches wearing GPS units. Maximal sprinting speed (MSS) and maximal aerobic speed (MAS) were measured. High-intensity threshold was individualized relative to MAS (>100% of MAS), and very-high-intensity distance was reported relative to both MAS and MSS. Blood samples were taken at rest and after each match.
  
  
  RESULTS
  Comparison of prematch and postmatch samples revealed significant (P < .01) changes in pH (7.41-7.25), bicarbonate concentration ([HCO3-]) (24.8-13.6 mmol/L), and lactate concentration ([La]) (2.4-11.9 mmol/L). Mean relative total distance covered was 91 ± 13 m/min with ~17 m/min at high-intensity. Player status (whole-match or interchanged players), match time, and total distance covered had no significant impact on metabolic indices. Relative distance covered at high intensity was negatively correlated with pH and [HCO3-] (r = .44 and r = .42, respectively; P < .01) and positively correlated with [La] (r = .36; P < .01). Total distance covered and distance covered at very high intensity during the 1-min peak activity in the last 3 min of play were correlated with [La] (r = .39 and r = .39, respectively; P < .01).
  
  
  CONCLUSIONS
  Significant alterations in blood-metabolite indices from prematch to postmatch sampling suggest that players were required to tolerate a substantial level of acidosis related to metabolite accumulation. In addition, the ability to produce energy via the glycolytic energy pathway seems to be a major determinant in match-related running performance.
authors.forename: Anthony
authors.initials: A
authors.lastname: Couderc
authors.forename: Claire
authors.initials: C
authors.lastname: Thomas
authors.forename: Mathieu
authors.initials: M
authors.lastname: Lacome
authors.forename: Julien
authors.initials: J
authors.lastname: Piscione
authors.forename: Julien
authors.initials: J
authors.lastname: Robineau
authors.forename: Rémi
authors.initials: R
authors.lastname: Delfour-Peyrethon
authors.forename: Rachel
authors.initials: R
authors.lastname: Borne
authors.forename: Christine
authors.initials: C
authors.lastname: Hanon
mesh_terms: D000138:Acidosis / Q000097:blood*; D000328:Adult; D056352:Athletes; D001639:Bicarbonates / Q000097:blood; D005538:Football / Q000502:physiology*; D040362:Geographic Information Systems; D006801:Humans; D019344:Lactic Acid / Q000097:blood; D008297:Male; D009068:Movement; D012420:Running / Q000502:physiology*; D055815:Young Adult
chemical_list: D001639:Bicarbonates; D019344:Lactic Acid
keywords: GPS; acidosis; high-speed running; lactate; team sport