A1 Journal article – refereed
Knee extension dynamometer: a new device for dynamic isokinetic magnetic resonance spectroscopy experiments

List of Authors: Mattila KT, Komu M, Karsikas R, Hatakka P, Heinonen OJ, Kormano M
Publication year: 1996
Journal: Magnetic Resonance Materials in Physics, Biology and Medicine
Journal name in source: Magma (New York, N.Y.)
Journal acronym: MAGMA
Volume number: 4
Issue number: 2
ISSN: 0968-5243

In the present study we introduce a new device for exercise magnetic resonance spectroscopy (MRS). It operates in a standard whole-body scanner. Mechanical exertion unit allows maximal 10 degrees to 15 degrees short-arc knee extensions. The device operates hydraulically and is based on isokinetic movement. The force and work conducted are automatically controlled by the electronic control and computer unit. A small surface coil placed on the vastus medialis muscle allows the collection of spectra without interfering spectra from nearby resting muscles. The force used for the extensions can be followed simultaneously as a curve on the screen in the operator's room and the data is transferred to a personal computer for later analysis. Total work and fatigue percentage are also calculated by the device. It also allows the use of different isokinetic exercise protocols. The measurements of force proved reliable in repeat measurements using an isokinetic test device as a control. This device has been used clinically for over a year, is easy to operate, and offers reliable measurements. It is well suited to trials where muscle energy states versus time are followed since it allows noninvasive simultaneous quantification of muscle performance and collecting MRS spectra at rest, during exercise, and in the recovery phase.

Last updated on 2019-21-08 at 21:31