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1 Department of Physiology, Faculty of Medical Sciences, University of Nijmegen, and 2 Neuromuscular Centre Nijmegen, Institute of Neurology, University Medical Centre St. Radboud, 6500 HB Nijmegen, The Netherlands
The aim of this study was to investigate local muscle O2
consumption (musc
O2) and forearm blood
flow (FBF) in resting and exercising muscle by use of near-infrared
spectroscopy (NIRS) and to compare the results with the global
muscO2 and FBF derived from the
well-established Fick method and plethysmography.
muscO2 was derived from
1) NIRS using venous occlusion, 2) NIRS using arterial occlusion, and 3) the Fick method
[muscO2(Fick)]. FBF was
derived from 1) NIRS and 2) strain-gauge
plethysmography. Twenty-six healthy subjects were tested at rest and
during sustained isometric handgrip exercise. Local variations were
investigated with two independent and simultaneously operating NIRS
systems at two different muscles and two measurement depths.
muscO2 increased more than fivefold in
the active flexor digitorum superficialis muscle, and it increased 1.6 times in the brachioradialis muscle. The average increase in
muscO2(Fick) was twofold.
FBF increased 1.4 times independent of the muscle or the method. It is
concluded that NIRS is an appropriate tool to provide information about local muscO2 and local FBF because both
place and depth of the NIRS measurements reveal local differences that
are not detectable by the more established, but also more global, Fick method.
muscle metabolism; forearm blood flow; noninvasive; sustained isometric handgrip exercise
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