title: Differences in Oxygenation Kinetics Between the Dominant and Nondominant Flexor Digitorum Profundus in Rock Climbers.
abstract: OBJECTIVE
  To examine differences in oxygenation kinetics in the nondominant and dominant flexor digitorum profundus (FDP) of rock climbers.
  
  
  METHODS
  Participants were 28 sport climbers with a range of on-site abilities (6a+ to 8a French Sport). Using near-infrared spectroscopy, oxygenation kinetics of the FDP was assessed by calculating the time to half recovery (t1/2 recovery) of the tissue-saturation index (TSI) after 3-5 min of ischemia.
  
  
  RESULTS
  A 2-way mixed-model ANOVA found a nonsignificant interaction (P = .112) for TSI by sex. However, there was a significant main effect (P = .027) of handedness (dominant vs nondominant FDP). The dominant forearm recovered 13.6% faster (t1/2 recoverymean difference = 1.12 s, 95% CI 0.13-2.10 s) than the nondominant FDP. This was not affected by 6-mo on-site climbing ability or sex (P = .839, P = .683).
  
  
  CONCLUSIONS
  Significant intraindividual differences in oxygenation kinetics of the FDP were found. Improvements in oxygenation kinetics in the FDP are likely due to the abilities of the muscle to deliver, perfuse, and consume oxygen. These enhancements may be due to structural adaptations in the microvasculature, such as an increase in capillary density and enhanced improvement in capillary filtration.
authors.forename: David
authors.initials: D
authors.lastname: Giles
authors.forename: Vanesa España
authors.initials: VE
authors.lastname: Romero
authors.forename: Inmaculada
authors.initials: I
authors.lastname: Garrido
authors.forename: Alejandro
authors.initials: A
authors.lastname: de la O Puerta
authors.forename: Keeron
authors.initials: K
authors.lastname: Stone
authors.forename: Simon
authors.initials: S
authors.lastname: Fryer
mesh_terms: D005260:Female; D005542:Forearm / Q000098:blood supply*; D007839:Functional Laterality / Q000502:physiology; D018737:Hand Strength / Q000502:physiology; D006801:Humans; D007537:Isometric Contraction / Q000502:physiology; D008297:Male; D009051:Mountaineering / Q000502:physiology*; D018482:Muscle, Skeletal / Q000098:blood supply* / Q000502:physiology*; D010101:Oxygen Consumption; D019265:Spectroscopy, Near-Infrared
keywords: asymmetry; handedness; near-infrared spectroscopy; rock climbing