By Topic

A Three-Channel Electromyograph with Synchronized Slow-Motion Photography

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

6 Author(s)
R. W. Vreeland ; Res. and Dev. Lab., University of California Medical Center, San Francisco, Calif. ; D. H. Sutherland ; J. J. Dorsa ; L. A. Williams
more authors

Muscle transplants are performed to strengthen knee extension in polio patients. The time of contraction of muscles in relationship to gait is under investigation. Relative activity is evaluated by electromyographic recording of muscle action potentials. Voltages are recorded from three pairs of flexible wire electrodes implanted in the working muscles. The electromyograph incorporates three commercial preamplifiers, a three-channel electronic switch, a dc amplifier, and a long persistent cathode-ray tube with 3-second sweep. An image of the cathode-ray screen is projected optically via a half-silvered mirror into the lens of a 16-mm movie camera. The camera shoots through the mirror to photograph the walking patient on the same frame with the three muscle traces. Recording speed is 64 frames per second. Frame-by-frame analysis is accomplished by means of a hand-crank projector. This system of recording thus provides simultaneous visualization of muscle electrical activity and the mechanical aspects of gait.

Published in:

IRE Transactions on Bio-Medical Electronics  (Volume:8 ,  Issue: 1 )