title: Influence of muscle fibre composition on muscle oxygenation during maximal running.
abstract: OBJECTIVE
  To investigate the relationship between muscle oxygenation (specifically, the levels of oxygenated haemoglobin and myoglobin [oxyHb/Mb]) during maximal running and muscle fibre composition, and to determine whether muscle fibre composition can be non-invasively estimated from oxyHb/Mb levels during maximal running.
  
  
  METHODS
  Eight male runners ([Formula: see text], 60.9± 4.6 mL·kg-1·min-1) performed an incremental running test on a treadmill. OxyHb/Mb levels of the vastus lateralis during maximal running were measured by near-infrared spectroscopy (NIRS). Muscle fibre composition of the vastus lateralis was determined from muscle biopsy samples from the same region measured by NIRS, and the fibre types were classified as type I, type IIa, or type IIb fibres using traditional pH-sensitive ATPase staining. Type I and type IIa fibres together were defined as oxidative fibres.
  
  
  RESULTS
  OxyHb/Mb levels during running were lowest at exhaustion in all participants. OxyHb/Mb levels at exhaustion were positively correlated with the percentages of type I fibres (r=0.755, p<0.05) and oxidative fibres (r=0.944, p<0.01).
  
  
  CONCLUSIONS
  We conclude that higher oxyHb/Mb levels at exhaustion during maximal running are correlated with a higher percentage of oxidative fibres, indicating the potential importance of oxidative fibres in the maintenance of oxyHb/Mb levels during maximal running. Additionally, muscle fibre composition could be non-invasively estimated from oxyHb/Mb levels during maximal running tests in runners.
authors.affiliation: Graduate School of Health and Sports Science , Juntendo University , Inzai-shi, Chiba , Japan.
authors.forename: Tomoharu
authors.initials: T
authors.lastname: Kitada
authors.affiliation: Graduate School of Health and Sports Science , Juntendo University , Inzai-shi, Chiba , Japan.
authors.forename: Shuichi
authors.initials: S
authors.lastname: Machida
authors.affiliation: Graduate School of Health and Sports Science , Juntendo University , Inzai-shi, Chiba , Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Naito
keywords: Athlete; Biopsy; Muscle metabolism; Running