title: Compression Garments, Muscle Contractile Function, and Economy in Trail Runners.
abstract: BACKGROUND
  Physiological mechanisms behind the use of compression garments (CGs) during off-road running are unknown.
  
  
  OBJECTIVE
  To investigate the influence of wearing CGs vs conventional running clothing (CON) on muscle contractile function and running economy before and after short-distance trail running.
  
  
  METHODS
  Knee-extensor neuromuscular function and running economy assessed from two 5-min treadmill runs (11 and 14 km/h) were evaluated before and after an 18.6-km short-distance trail run in 12 trained athletes wearing either CGs (stocking + short-tight) or CON. Quadriceps neuromuscular function was assessed from mechanical and EMG recording after maximal percutaneous electrical femoral-nerve stimulations (single-twitch doublets at 10 [Db10] and 100 Hz [Db100] delivered at rest and during maximal quadriceps voluntary contraction [MVC]).
  
  
  RESULTS
  Running economy (in mL O2· km-1· kg-1) increased after trail running independent of the clothing condition and treadmill speeds (P < .001). Similarly, MVC decreased after CON and CGs conditions (-11% and -13%, respectively, P < .001). For both clothing conditions, a significant decrease in quadriceps voluntary activation, Db10, Db100, and the low-to-high frequency doublet ratio were observed after trail running (time effect, all P < .01), without any changes in rectus femoris maximal M-wave.
  
  
  CONCLUSIONS
  Wearing CGs does not reduce physiological alterations induced during short-distance trail running. Further studies should determine whether higher intensity of compression pressure during exercises of longer duration may be effective to induce any physiological benefits in experienced trail runners.
authors.forename: Fabrice
authors.initials: F
authors.lastname: Vercruyssen
authors.forename: Mathieu
authors.initials: M
authors.lastname: Gruet
authors.forename: Serge S
authors.initials: SS
authors.lastname: Colson
authors.forename: Sabine
authors.initials: S
authors.lastname: Ehrstrom
authors.forename: Jeanick
authors.initials: J
authors.lastname: Brisswalter
mesh_terms: D054874:Athletic Performance / Q000502:physiology*; D003020:Clothing; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007717:Knee / Q000502:physiology; D009119:Muscle Contraction / Q000502:physiology*; D018763:Muscle Fatigue / Q000502:physiology; D010101:Oxygen Consumption; D010465:Perception; D005082:Physical Exertion / Q000502:physiology; D052097:Quadriceps Muscle / Q000502:physiology; D012420:Running / Q000502:physiology*
keywords: compression clothing; muscle fatigue; neuromuscular performance; oxygen demand; short-distance trail running