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Effects of Length on the Catchlike Property of Human Quadriceps Femoris Muscle

SCK Lee, PT, is a doctoral candidate in the Interdisciplinary Graduate Program in Biomechanics and Movement Sciences, University of Delaware, Newark, Del
ML Gerdom, is a student in the Master's of Physical Therapy Program, Department of Physical Therapy, University of Delaware
SA Binder-Macleod, PhD, PT, is Chair and Associate Professor, Department of Physical Therapy, University of Delaware, 315 McKinly Lab, Newark, DE 19716 (USA) (sbinder{at}udel.edu). Address all correspondence to Dr Binder-Macleod

Background and Purpose. Recent reports have suggested that electrical stimulation trains that take advantage of the catchlike property of skeletal muscle can produce higher forces from skeletal muscle than traditionally used constant-frequency trains. This study investigated the effects of catchlike-inducing trains on human quadriceps femoris muscles while the knee joint was held at 15 degrees of flexion. Subjects and Methods. Subjects (N=12) were tested with constant-frequency trains that had interpulse intervals ranging from 10 to 160 milliseconds and comparable catchlike-inducing trains. Data were collected during the control condition (1 train every 10 seconds) and during repetitive contractions (1 train per second). Results. During control and repetitive activation conditions, catchlike-inducing trains produced approximately 5% to 110% greater peak forces than comparable constant-frequency trains, depending on the frequencies being compared. Total forces produced (ie, force-time integrals) were increased up to 59% and 49% during the control and repetitive activation conditions, respectively. Conclusion and Discussion. These results support earlier findings that catchlike-inducing trains may be advantageous in functional electrical stimulation applications.

Key Words: Catchlike property • Fatigue • Functional electrical stimulation • Human quadriceps femoris muscle • Muscle length

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