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Phys Ther. 1999 Aug;79(8):738-48.

Effects of length on the catchlike property of human quadriceps femoris muscle.

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1
Interdisciplinary Graduate Program in Biomechanics and Movement Sciences, University of Delaware, Newark, USA.

Abstract

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 kneejoint 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.

PMID:
10440660
[Indexed for MEDLINE]
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