The Relationship Between a Muscle Fiber Recruitment Pattern and a Tissue Oxygenation Level on Isometric Contractions with Vascular Occlusion

Abstract

This study examined how muscle ischemia influence tissue oxygen kinetics and a recruitment pattern of muscle fiber in the same intramuscular distal and proximal part of vastus lateralis. We measured changes in near-infrared spectroscopy（NIRS）and in surface EMG during knee extension movement at 10, 30 and 50%MVC in cuff ischemia and non-cuff ischemia conditions. Four adult male subjects were examined. Deoxygenation during knee extension was higher in distal part than in proximal part at 10%MVC with and without cuff ischemia. Cuff ischemia during muscle contraction influences tissue oxygen kinetics, but a recruitment pattern of muscle fiber is not necessarily influenced.