A1 Refereed original research article in a scientific journal

Knee extension dynamometer: a new device for dynamic isokinetic magnetic resonance spectroscopy experiments




AuthorsMattila KT, Komu M, Karsikas R, Hatakka P, Heinonen OJ, Kormano M

Publication year1996

JournalMagnetic Resonance Materials in Physics, Biology and Medicine

Journal name in sourceMagma (New York, N.Y.)

Journal acronymMAGMA

Volume4

Issue2

First page 115

Last page22

Number of pages8

ISSN0968-5243

DOIhttps://doi.org/10.1007/BF01772518


Abstract
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 2024-26-11 at 13:50