Tissue oxygen saturation is non-invasively measured using near-infrared spectroscopy, by two device, INVOS®(somanetics Corporation, USA ) and InSpectra™ (Hutchinson Technology, USA). Each probes are attached to both thenar muscles and vascular occlusion test (VOT) is performed. The investigators will compare the Invos® data to InSpectra™ to investigate whether tissue oxygen saturation values by INVOS® can substitute for InSpectra™.
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Change of Tissue Oxygenation Value During Ischemia and Reperfusion Period Until Basline Value Was Achieved
Timeframe: Until basline tissue oxygenation value was achieved
Sum of Tissue Oxygenation Value Which Above Basline Value After Reperfusion Period Until Basline Value Was Achieved
Timeframe: Until basline tissue oxygenation value was achieved