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Optimization of isotonic performance...

Lee, Samuel Chung-Kyu.

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Optimization of isotonic performance of human skeletal muscle.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Optimization of isotonic performance of human skeletal muscle./
Author:	Lee, Samuel Chung-Kyu.
Description:	212 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 3654.
Contained By:	Dissertation Abstracts International60-08B.
Subject:	Biology, Animal Physiology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9941025
ISBN:	0599425539

Optimization of isotonic performance of human skeletal muscle.
Lee, Samuel Chung-Kyu.

Optimization of isotonic performance of human skeletal muscle. - 212 p.

Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 3654.

Thesis (Ph.D.)--University of Delaware, 1999.

Electrical stimulation can be used to activate paralyzed muscle to produce functional movements (FES). Muscle fatigue, however, is a major limitation thus, optimization of force production is needed. One method of producing the most force from each active motor unit is to use stimulation patterns that exploit the catchlike property of skeletal muscle ( CITs). CITs have an initial, high-frequency burst (burst portion) at the onset of a subtetanic constant-frequency train of pulses (constant-frequency portion). Burst characteristics that optimize isometric contractions include a pair of pulses (doublet) with a 5-ms interpulse interval (IPI). No studies have examined the influence of the constant-frequency portion of CITs or muscle length on force augmentation. Additionally, no studies have examined isotonic contractions. The purpose of this research was to identify stimulation patterns that optimize isotonic performance of human skeletal muscle.

ISBN: 0599425539Subjects--Topical Terms:

1017835
Biology, Animal Physiology.

Optimization of isotonic performance of human skeletal muscle.
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020 $a 0599425539
035 $a (UnM)AAI9941025
035 $a AAI9941025
040 $a UnM $c UnM
100 1 $a Lee, Samuel Chung-Kyu. $3 1948326
245 1 0 $a Optimization of isotonic performance of human skeletal muscle.
300 $a 212 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-08, Section: B, page: 3654.
500 $a Professor in charge: Stuart A. Binder-Macleod.
502 $a Thesis (Ph.D.)--University of Delaware, 1999.
520 $a Electrical stimulation can be used to activate paralyzed muscle to produce functional movements (FES). Muscle fatigue, however, is a major limitation thus, optimization of force production is needed. One method of producing the most force from each active motor unit is to use stimulation patterns that exploit the catchlike property of skeletal muscle ( CITs). CITs have an initial, high-frequency burst (burst portion) at the onset of a subtetanic constant-frequency train of pulses (constant-frequency portion). Burst characteristics that optimize isometric contractions include a pair of pulses (doublet) with a 5-ms interpulse interval (IPI). No studies have examined the influence of the constant-frequency portion of CITs or muscle length on force augmentation. Additionally, no studies have examined isotonic contractions. The purpose of this research was to identify stimulation patterns that optimize isotonic performance of human skeletal muscle.
520 $a First, the frequency of the constant-frequency portion of CITs on force optimization was studied at different muscle lengths during isometric contractions. The results of these studies helped to formulate hypotheses for optimizing isotonic performance.
520 $a CFTs and CITs were used to produce isotonic contractions of quadriceps femoris muscles during low, medium and high loads both when the muscles were fresh and fatigued. Excursion, work, peak power, and average power in response to each contraction were calculated. Low-frequency CITs augmented performance during fresh and fatigued conditions. For fresh muscles, optimal CITs had an initial doublet with a 5-ms IPI. For fatigued muscles, optimum CITs had triplets or quadruplets with 5-ms IPIs. Augmentations in performance by CITs vs. CFTs increased with fatigue and load. All performance measures had parabolic relationships as a function of IPI. For fresh muscle, optimal CITs (50- to 60-ms IPIs) did not produce augmentations in performance vs. optimal CFTs (40- to 50-ms IPIs). For fatigued muscle, optimal CITs (30- to 50-ms IPIs) produced greater performance than all CFTs. Fatigue of performance measures was related to problems in excitation-contraction coupling. CITs were effective in augmenting performance vs. CFTs because they produced more rapid rates of rise of force. The present results suggest that CITs may reduce fatigue during FES.
590 $a School code: 0060.
650 4 $a Biology, Animal Physiology. $3 1017835
650 4 $a Health Sciences, Rehabilitation and Therapy. $3 1017926
690 $a 0433
690 $a 0382
710 2 0 $a University of Delaware. $3 1017826
773 0 $t Dissertation Abstracts International $g 60-08B.
790 1 0 $a Binder-Macleod, Stuart A., $e advisor
790 $a 0060
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9941025