Muscle oxygenation kinetics at the onset of exercise do not depend on exercise intensity

Ken Ichi Shibuya, Junya Tanaka, Tetsuro Ogaki

Research output: Contribution to journalArticle

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Abstract

The purpose of this study was to determine whether the onset kinetics of muscle oxygenation in localized working muscle (mOxy) was affected by differences in exercise intensity. Five healthy male subjects exercised for 6 min at 125 W, 150 W, and 175 W, and 1 min at 300 W on a cycle ergometer. mOxy was estimated by near-infrared spectroscopy (NIRS) with a continuous wave photometer. The MRS probe was positioned on the vastus lateralis muscle of the right leg. The relative change in mOxy was calculated from the relative change of the oxygenated hemoglobin (OxyHb) and deoxygenated hemoglobin (DeoxyHb) concentration from their resting values ([mOxy]= Δ[OxyHb]-Δ[DeoxyHb]). Assuming an exponential time course with time delay, the time constants of the mOxy were 5.7 (SD 2.2) s at 125 W, 5.6 (SD 1.9) s at 150 W, 6.0 (SD 2.2) s at 175 W, and 5.6 (SD 2.1) s at 300 W. The time delays of the mOxy were 6.7 (SD 4.2) s at 125 W, 8.6 (SD 1.6) s at 150 W, 6.4 (SD 3.0) s at 175 W, and 5.4 (SD 2.9) s at 300 W. The mean response times of the mOxy were 12.5 (SD 2.7) s at 125 W, 14.2 (SD 2.4) s at 150 W, 12.4 (SD 4.4) s at 175 W, and 11.0 (SD 3.1) s at 300 W. These results indicate that the kinetics of mOxy were not affected by differences in exercise intensity.

Original languageEnglish
Pages (from-to)712-715
Number of pages4
JournalEuropean Journal of Applied Physiology
Volume91
Issue number5-6
DOIs
Publication statusPublished - May 1 2004

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Hemoglobins
Exercise
Muscles
Near-Infrared Spectroscopy
Quadriceps Muscle
Reaction Time
Leg
Healthy Volunteers

All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physiology (medical)

Cite this

Muscle oxygenation kinetics at the onset of exercise do not depend on exercise intensity. / Shibuya, Ken Ichi; Tanaka, Junya; Ogaki, Tetsuro.

In: European Journal of Applied Physiology, Vol. 91, No. 5-6, 01.05.2004, p. 712-715.

Research output: Contribution to journalArticle

Shibuya, Ken Ichi ; Tanaka, Junya ; Ogaki, Tetsuro. / Muscle oxygenation kinetics at the onset of exercise do not depend on exercise intensity. In: European Journal of Applied Physiology. 2004 ; Vol. 91, No. 5-6. pp. 712-715.
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