title: [Relationship between respiration exchange ratio and muscle oxygen content measured by near-infrared spectroscopy].
abstract: OBJECTIVE
  To study the relationship between respiration exchange ratio (RER) and tissue oxygen content in human skeletal muscle.
  
  
  METHODS
  Using a portable tissue oximeter based on near-infrared spectroscopy (NIRS), the relative changes of skeletal muscle oxygen content were measured non-invasively and in vivo when healthy volunteers were performing an incremental intensity running protocol. The results were compared with heart rate (HR), VO2, VCO2, and RER.
  
  
  RESULTS
  In the experiment, the change in skeletal muscle oxygenation content of the volunteers was regular and has a significant close relationship to HR, VO2 and RER (P=0.01).
  
  
  CONCLUSIONS
  It shows that NIRS is a new photonic technology which provides a measurable biomedical parameter for the evaluation of athlete's physique and training effect. It offers reference for monitoring and assessing training effect in vivo, real-time and non-invasively.
authors.affiliation: Sports Kinetics Department of Wuhan Institute of Physical Education, Wuhan Hubei, China. xguodong@email.wipe.edu.cn
authors.forename: Guo-dong
authors.initials: GD
authors.lastname: Xu
authors.forename: Ming
authors.initials: M
authors.lastname: Liu
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Hui
authors.initials: H
authors.lastname: Gong
authors.forename: Qing-ming
authors.initials: QM
authors.lastname: Luo
mesh_terms: D000328:Adult; D001810:Blood Volume; D002245:Carbon Dioxide / Q000378:metabolism; D005069:Evaluation Studies as Topic; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D018482:Muscle, Skeletal / Q000378:metabolism*; D010101:Oxygen Consumption / Q000502:physiology*; D005082:Physical Exertion / Q000502:physiology; D012119:Respiration; D012420:Running; D013055:Spectrophotometry, Infrared / Q000295:instrumentation / Q000379:methods
chemical_list: D002245:Carbon Dioxide