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Influence of angular velocity on Vastus Lateralis and Rectus Femoris oxygenation dynamics during knee extension exercises
Author(s) -
Denis Romain,
Wilkinson Jennifer,
De Vito Giuseppe
Publication year - 2011
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/j.1475-097x.2011.01023.x
Subject(s) - medicine , oxygenation , vastus medialis , rectus femoris muscle , blood flow , vasodilation , cardiology , anatomy , anesthesia , physical medicine and rehabilitation , electromyography
Summary The purpose of this study was to investigate whether changes in angular velocity would alter vastus lateralis (VL) and rectus femoris (RF) oxygenation status during maximal isokinetic knee extension exercises. Eleven recreationally active male participants randomly performed ten maximal knee extensions at 30, 60, 120 and 240° s −1 . Tissue oxygenation index (TOI) and total haemoglobin concentration ([tHb]) were acquired from the VL and RF muscles by means of near‐infrared spectroscopy (NIRS). Breath‐by‐breath pulmonary oxygen consumption () was recorded throughout the tests. Peak torque and significantly decreased as a function of velocity ( P <0·05). Interestingly, RF and VL TOI significantly increased as a function of velocity ( P <0·05), whereas [tHb] significantly decreased as a function of velocity ( P <0·05). A greater number of muscle fibre recruited at slow velocity, where the torque and were the highest, might explain the lower VL and RF TOI observed herein. Furthermore, the increase in local blood flow (suggested by [tHb] changes) during isokinetic knee extension exercises performed at slow angular velocity might have been induced by a higher intramuscular pressure during the contraction phases as well as a greater microcirculatory vasodilatation during relaxation phases. Implementing slow‐velocity isokinetic exercises in rehabilitation or other training programmes could delay the short‐term anoxia generated by such exercises and result in muscle metabolism enhancement.