The monitoring of a single muscle location does not reflect the heterogeneity of the muscle groups activation during exercise. In the past, measurements of oxygen consumption (VO2) at single muscle locations could be carried out non-invasively by near-infrared continuous wave spectroscopy (NIRCWS) at rest or during isometric contractions. In the present study, human regional quadriceps (vastus lateralis and rectus femoris) VO2 was investigated at rest and during maximal voluntary contractions using a 12- channel NIRCWS system with an acquisition time of 0.1 s.
It is not known to what extent effects in extracerebral tissue influence non-invasive near infra-red optical measurement of cerebral arterial oxygenation saturation. Measurements were made at different positions on the forehead of six healthy adult male volunteers with arterial saturation near to 100%. The optical ratios between the pulse heights at different wavelengths were as expected from the spectral characteristics of hemoglobin, but showed an unacceptably large spread: the mean ratio between the 770 and 905 nm pulse heights was 0.69 (SD 0.08, range 0.50 - 0.95). We consider that this was due to pulsation of large extracranial arteries.
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