title: Quantifying Neuromuscular Fatigue Induced by an Intense Training Session in Rugby Sevens.
abstract: OBJECTIVE
  To compare the sensitivity of a sprint vs a countermovement-jump (CMJ) test after an intense training session in international rugby sevens players, as well as analyze the effects of fatigue on sprint acceleration.
  
  
  METHODS
  Thirteen international rugby sevens players completed two 30-m sprints and a set of 4 repetitions of CMJ before and after a highly demanding rugby sevens training session.
  
  
  RESULTS
  Change in CMJ height was unclear (-3.6%; ±90% confidence limits 11.9%. Chances of a true positive/trivial/negative change: 24/10/66%), while a very likely small increase in 30-m sprint time was observed (1.0%; ±0.7%, 96/3/1%). A very likely small decrease in the maximum horizontal theoretical velocity (V0) (-2.4; ±1.8%, 1/4/95%) was observed. A very large correlation (r = -.79 ± .23) between the variations of V0and 30-m-sprint performance was also observed. Changes in 30-m sprint time were negatively and very largely correlated with the distance covered above the maximal aerobic speed (r = -.71 ± .32).
  
  
  CONCLUSIONS
  The CMJ test appears to be less sensitive than the sprint test, which casts doubts on the usefulness of a vertical-jump test in sports such as rugby that mainly involve horizontal motions. The decline in sprint performance relates more to a decrease in velocity than in force capability and is correlated with the distance covered at high intensity.
authors.forename: Bruno
authors.initials: B
authors.lastname: Marrier
authors.forename: Yann
authors.initials: Y
authors.lastname: Le Meur
authors.forename: Julien
authors.initials: J
authors.lastname: Robineau
authors.forename: Mathieu
authors.initials: M
authors.lastname: Lacome
authors.forename: Anthony
authors.initials: A
authors.lastname: Couderc
authors.forename: Christophe
authors.initials: C
authors.lastname: Hausswirth
authors.forename: Julien
authors.initials: J
authors.lastname: Piscione
authors.forename: Jean-Benoît
authors.initials: JB
authors.lastname: Morin
mesh_terms: D000054:Acceleration; D000328:Adult; D005080:Exercise Test / Q000379:methods*; D005538:Football / Q000502:physiology*; D006339:Heart Rate; D006801:Humans; D008297:Male; D018763:Muscle Fatigue / Q000502:physiology*; D010465:Perception; D064797:Physical Conditioning, Human / Q000379:methods*; D005082:Physical Exertion / Q000502:physiology; D059385:Plyometric Exercise
keywords: jump; performance; sprint; team sports; tests