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The electrically elicited force resp...

Scott, Wayne B.

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The electrically elicited force responses of the paralyzed quadriceps femoris muscles of people with spinal cord injury.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The electrically elicited force responses of the paralyzed quadriceps femoris muscles of people with spinal cord injury./
Author:	Scott, Wayne B.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2004,
Description:	144 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 3985.
Contained By:	Dissertation Abstracts International65-08B.
Subject:	Physical therapy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3144813
ISBN:	9780496030620

The electrically elicited force responses of the paralyzed quadriceps femoris muscles of people with spinal cord injury.
Scott, Wayne B.

The electrically elicited force responses of the paralyzed quadriceps femoris muscles of people with spinal cord injury. - Ann Arbor : ProQuest Dissertations & Theses, 2004 - 144 p.

Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 3985.

Thesis (Ph.D.)--University of Delaware, 2004.

Electrical stimulation of skeletal muscle can be used by persons with spinal cord injury (SCI) to perform functional movements and to condition their paralyzed muscles to counter many of the deleterious consequences of SCI. However, the paralyzed muscles of persons with SCI undergo characteristic physiologic changes that affect the response of the muscle to electrical stimulation. The overall goal of this work was to explore the force responses of the functionally important paralyzed quadriceps muscle to different frequencies and patterns of electrical stimulation.

ISBN: 9780496030620Subjects--Topical Terms:

588713
Physical therapy.

The electrically elicited force responses of the paralyzed quadriceps femoris muscles of people with spinal cord injury.
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100 1 $a Scott, Wayne B. $3 3426831
245 1 4 $a The electrically elicited force responses of the paralyzed quadriceps femoris muscles of people with spinal cord injury.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2004
300 $a 144 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-08, Section: B, page: 3985.
500 $a Professor in charge: Stuart A. Binder-Macleod.
502 $a Thesis (Ph.D.)--University of Delaware, 2004.
520 $a Electrical stimulation of skeletal muscle can be used by persons with spinal cord injury (SCI) to perform functional movements and to condition their paralyzed muscles to counter many of the deleterious consequences of SCI. However, the paralyzed muscles of persons with SCI undergo characteristic physiologic changes that affect the response of the muscle to electrical stimulation. The overall goal of this work was to explore the force responses of the functionally important paralyzed quadriceps muscle to different frequencies and patterns of electrical stimulation.
520 $a The first study investigated the effects of SCI on the contractile properties and force-frequency relationship (FFR) of the quadriceps muscles of SCI subjects and matched able-bodied (AB) subjects in both a non-fatigued and fatigued condition. Compared to the matched AB subjects, the paralyzed muscles of the SCI subjects were weak, less resistant to fatigue, and contracted and relaxed faster. The F50 measure that was used to assess differences in the FFR was lower for the SCI subjects than the AB subjects in the fatigued condition. The F50s for the SCI and AB group were significantly greater in the fatigued condition as compared to their respective non-fatigued F50s. These results indicate that lower frequencies can produce equivalent normalized forces in SCI subjects as compared to AB subjects, and that when fatigued higher frequencies are required to produce equivalent normalized forces as compared to the non-fatigued condition for both groups.
520 $a The second study investigated the force response of the quadriceps muscles of SCI subjects and matched AB subjects to 6-pulse stimulation trains of different frequencies and patterns of stimulation. Traditionally, constant-frequency trains (CFT) have been used to activate paralyzed skeletal muscle. However, research from AB subjects has shown that variable-frequency trains (VFT) and doublet-frequency trains (DFT) can augment force production, particularly when muscles are fatigued. In this study, the VFT and DFT stimulation train patterns were largely ineffective at augmenting the forces produced by the paralyzed muscles except at the lowest frequencies tested. In contrast, for the AB subjects in both the non-fatigued and fatigued conditions either the VFT or DFT, or both, produced higher forces than the CFT at nearly all of the frequencies tested. These results indicate that the responses of non-paralyzed and paralyzed muscle are different and that further work may be required to identify the stimulation train patterns that maximize force production from paralyzed muscle.
520 $a The third study investigated a strategy of using a combination of stimulation train types to repetitively activate the paralyzed quadriceps muscle to counter the rapid onset of fatigue that limits the clinical effectiveness of functional electrical stimulation. The combination of CFTs followed by DFTs reached the targeted isometric force more times than either the CFTs alone or DFTs alone. This finding confirms that switching train types is a useful strategy to offset the rapid fatigue that persons with SCI experience when using FES.
590 $a School code: 0060.
650 4 $a Physical therapy. $3 588713
650 4 $a Animal Physiology. $3 894174
690 $a 0382
690 $a 0433
710 2 $a University of Delaware. $3 1017826
773 0 $t Dissertation Abstracts International $g 65-08B.
790 $a 0060
791 $a Ph.D.
792 $a 2004
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3144813