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Proceedings Paper

Functional imaging of muscle oxygenation and oxygen consumption in the knee extensor muscles during isometric contractions by spatially resolved near-infrared spectroscopy
Author(s): Khai Jun Kek; Takahiro Miyakawa; Nobuki Kudo; Katsuyuki Yamamoto
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Paper Abstract

In this study, we showed that exercise type- and intensity-dependent regional differences in muscle oxygenation and oxygen consumption rate (Vo2) of the knee extensor muscles could be imaged in real time with a multi-channel spatially resolved near-infrared spectroscopy (SR-NIRS) imaging device. Healthy subjects performed isometric knee extension exercise for 30 s (without- or with-leg-press action) at different exercise intensities [10%, 40% and 70% of maximum voluntary contraction (MVC)]. "Separation-type" probes were attached to the skin over the major knee extensor muscles: vastus lateralis (VL), rectus femoris (RF) and vastus medialis (VM). Placement of the probes enabled simultaneously measurement of 12 sites over a skin area of about 30 cm2 (temporal resolution = 0.25 s). Local Vo2 of each muscle, resting Vo2 (Vo2, rest) and recovery Vo2 (Vo2, rec ), were determined with arterial occlusion before the start and after the end of contraction, respectively. There was no significant difference between the values of Vo2 rest, in the muscles. However, during knee extension exercise without-leg-press action, Vo2 rec, value of the RF was significantly greater than the values of the VL and VM at all exercise intensities. In contrast, during exercise with-leg-press action, Vo2 rec, values of the RF and VM were greater than those of the VL, especially during exercise at 40% and 70% MVC. In summary, the regional differences in muscle oxygenation and Vo2 of the knee extensor muscles, probably due to the differences in relative contributions of muscles to exercise and in muscle architecture, were imaged using SR-NIRS.

Paper Details

Date Published: 13 February 2007
PDF: 12 pages
Proc. SPIE 6434, Optical Tomography and Spectroscopy of Tissue VII, 643422 (13 February 2007); doi: 10.1117/12.698783
Show Author Affiliations
Khai Jun Kek, Hokkaido Univ. (Japan)
Takahiro Miyakawa, Hokkaido Univ. (Japan)
Nobuki Kudo, Hokkaido Univ. (Japan)
Katsuyuki Yamamoto, Hokkaido Univ. (Japan)


Published in SPIE Proceedings Vol. 6434:
Optical Tomography and Spectroscopy of Tissue VII
Britton Chance; Robert R. Alfano; Bruce J. Tromberg; Mamoru Tamura; Eva Marie Sevick-Muraca, Editor(s)

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