Title :
Force-velocity and length-tension properties of stimulated human quadriceps muscle in spinal cord injured children
Author :
Triolo, R.J. ; Robinson, D.E. ; Betz, R.R.
Author_Institution :
Shriners Hospital for Crippled Children, Philadelphia, PA, USA
Abstract :
The force-velocity and length-tension properties of electrically stimulated quadriceps muscles were determined in a pilot study with two teenage subjects with midthoracic spinal cord injuries. Percutaneous intramuscular electrodes were used to elicit maximal isometric and concentric isokinetic contractions over angles range from 20° to 80° of knee flexion and over speeds from 30° to 150° per second. Submaximal contractions were generated both eccentrically and concentrically. Maximal concentric moment-velocity-angle surfaces were found to be similar in all respects to force-velocity-length surfaces reported for isolated animal preparations. Submaximal profiles grossly approximated the characteristics of maximal contractions. For any joint angle, eccentric moments were generally greater than those produced isometrically or concentrically
Keywords :
biomechanics; muscle; eccentric moments; force-velocity properties; isolated animal preparations; joint angle; length-tension properties; maximal contractions; percutaneous intramuscular electrodes; spinal cord injured children; stimulated human quadriceps muscle; submaximal contractions; teenage subjects; Animals; Electrodes; Hospitals; Humans; Knee; Muscles; Pulse measurements; Spinal cord; Testing; Velocity measurement;
Conference_Titel :
Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in
Conference_Location :
Seattle, WA
DOI :
10.1109/IEMBS.1989.95642
