Type

Journal Article

Authors

Giuseppe De Vito
Jennifer Wilkinson
Romain Denis

Subjects

Pharmacology

Topics
humans metabolism time factors knee hemoglobins oxygen consumption torque muscle contraction analysis of variance quadriceps muscle pulmonary ventilation male spectroscopy near infrared regional blood flow young adult hemodynamics blood supply adult biomechanics

Influence of angular velocity on vastus lateralis and rectus femoris oxygenation dynamics during knee extension exercises. (2011)

Abstract 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 (VO(2p)) was recorded throughout the tests. Peak torque and VO(2p) 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 VO(2p) 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.
Collections Ireland -> University College Dublin -> PubMed

Full list of authors on original publication

Giuseppe De Vito, Jennifer Wilkinson, Romain Denis

Experts in our system

1
Giuseppe De Vito
University College Dublin
Total Publications: 47