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A non-invasive, near-infrared tissue spectrophotometer has been previously described. The device utilizes the differential absorption characteristics of oxy-hemoglobin (HbO2) and deoxy-hemoglobin (Hb) at 760 and 850 nm to indicate localized changes in tissue oxygenation. The present study was undertaken to examine the relative magnitude of vastus lateralis deoxygenation in highly-trained cyclists at maximal effort. A ramp exercise to exhaustion was immediately followed by a cuff ischemia to elicit a maximal Hb signal. All of the subjects exhibited further deoxygenation upon cuff ischemia; determined to be 63%, 69%, 72%, and 56% of maximal Hb signal. This suggests that there was incomplete depletion of oxygen supply in the vastus lateralis muscles of these subjects at exhaustion.
Keith Kendrick,Britton Chance, andRuss Richardson
"Relative deoxygenation in the vastus lateralis", Proc. SPIE 1888, Photon Migration and Imaging in Random Media and Tissues, (14 September 1993); https://doi.org/10.1117/12.154667
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Keith Kendrick, Britton Chance, Russ Richardson, "Relative deoxygenation in the vastus lateralis," Proc. SPIE 1888, Photon Migration and Imaging in Random Media and Tissues, (14 September 1993); https://doi.org/10.1117/12.154667