Muscle oxygen saturation heterogeneity among leg muscles during ramp exercise

Shun Takagi*, Ryotaro Kime, Masatsugu Niwayama, Norio Murase, Toshihito Katsumura

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)


We examined whether O2 saturation in several leg muscles changes as exercise intensity increases. Twelve healthy young males performed 20 W/min ramp bicycle exercise until exhaustion. Pulmonary O2 uptake (VO 2) was monitored continuously during the experiments to determine peak oxygen uptake. Muscle O2 saturation (SmO2) was also monitored continuously at the belly of the vastus lateralis (VL), rectus femoris, vastus medialis, biceps femoris, gastrocnemius lateralis, gastrocnemius medialis, and tibialis anterior by near-infrared spatial resolved spectroscopy. Although the VL muscle mainly contributes during cycling exercise, deoxygenation was enhanced not only in the VL muscle but also in the other thigh muscles and lower leg muscles with increased exercise intensity. Furthermore, SmO2 response during ramp cycling exercise differed considerably between leg muscles.

Original languageEnglish
Title of host publicationAdvances in Experimental Medicine and Biology
Number of pages6
Publication statusPublished - 2013
Externally publishedYes

Publication series

NameAdvances in Experimental Medicine and Biology
ISSN (Print)00652598


  • Cycling exercise
  • Heterogeneity
  • Muscle oxygen saturation
  • Near-infrared spatial resolved spectroscopy
  • Oxygen uptake

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)


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