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The effects of training at equal pow...

Rafeei, Tourage.

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The effects of training at equal power levels using eccentric and concentric contractions on skeletal muscle fiber and whole muscle hypertrophy, muscle force, and muscle activation in human subjects.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The effects of training at equal power levels using eccentric and concentric contractions on skeletal muscle fiber and whole muscle hypertrophy, muscle force, and muscle activation in human subjects./
Author:	Rafeei, Tourage.
Description:	143 p.
Notes:	Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 2648.
Contained By:	Dissertation Abstracts International60-06B.
Subject:	Health Sciences, Rehabilitation and Therapy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9935726
ISBN:	0599367261

The effects of training at equal power levels using eccentric and concentric contractions on skeletal muscle fiber and whole muscle hypertrophy, muscle force, and muscle activation in human subjects.
Rafeei, Tourage.

The effects of training at equal power levels using eccentric and concentric contractions on skeletal muscle fiber and whole muscle hypertrophy, muscle force, and muscle activation in human subjects. - 143 p.

Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 2648.

Thesis (Ph.D.)--Virginia Commonwealth University, 1999.

The purpose of this study was to compare the effects of training using concentric and eccentric contractions on muscle hypertrophy, muscle activation, and muscle force. The training intensity of equal submaximal effort was used to provide a basis for comparison of concentric and eccentric contractions. Twenty healthy volunteers were randomly assigned to either concentric or eccentric training. Subjects performed 5 sets of 10 right knee extension contractions, three times per week. Both groups performed training contractions at a target power of 90% +/- 10% of their maximal concentric power. Needle biopsies were obtained prior to training, after 4 weeks of training and after 6 weeks of training from the right vastus lateralis muscle and muscle fiber type were differentiated. Images of the right quadriceps muscle were obtained using magnetic resonance imaging and the cross-sectional area (CSA) of each muscle was calculated at 20%, 40%, 60%, and 80% of the femur length prior to and after training. The EMG signals, obtained from the quadriceps muscles, were recorded during training and during maximal isometric contractions, prior to training, after 4 weeks and after 6 weeks of training. Repeated measure ANOVAs were used to determine if changes occurred within each group and to determine if the amount of change was different between groups. There was no overall difference between groups for type I fiber hypertrophy throughout the study. The mean increase in type II fiber CSA was greater in the concentric group than in the eccentric group. This difference occurred in the first 4 weeks of training. At nearly all levels the concentric group showed greater increase in all quadriceps muscles CSA than the eccentric group. Both concentric and eccentric groups increased their rmsEMG during maximal isometric contractions, with no difference between groups. There was a greater increase in maximal isometric force in the concentric group than in the eccentric group. The significant difference in maximal muscle force and lack of difference in the increased rmsEMG between training groups can be explained by the roles of other factors such as muscle hypertrophy that play a role in producing increased muscle force.

ISBN: 0599367261Subjects--Topical Terms:

1017926
Health Sciences, Rehabilitation and Therapy.

The effects of training at equal power levels using eccentric and concentric contractions on skeletal muscle fiber and whole muscle hypertrophy, muscle force, and muscle activation in human subjects.
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100 1 $a Rafeei, Tourage. $3 1948321
245 1 4 $a The effects of training at equal power levels using eccentric and concentric contractions on skeletal muscle fiber and whole muscle hypertrophy, muscle force, and muscle activation in human subjects.
300 $a 143 p.
500 $a Source: Dissertation Abstracts International, Volume: 60-06, Section: B, page: 2648.
500 $a Directors: Sheryl D. Finucane; Steven J. Goldberg.
502 $a Thesis (Ph.D.)--Virginia Commonwealth University, 1999.
520 $a The purpose of this study was to compare the effects of training using concentric and eccentric contractions on muscle hypertrophy, muscle activation, and muscle force. The training intensity of equal submaximal effort was used to provide a basis for comparison of concentric and eccentric contractions. Twenty healthy volunteers were randomly assigned to either concentric or eccentric training. Subjects performed 5 sets of 10 right knee extension contractions, three times per week. Both groups performed training contractions at a target power of 90% +/- 10% of their maximal concentric power. Needle biopsies were obtained prior to training, after 4 weeks of training and after 6 weeks of training from the right vastus lateralis muscle and muscle fiber type were differentiated. Images of the right quadriceps muscle were obtained using magnetic resonance imaging and the cross-sectional area (CSA) of each muscle was calculated at 20%, 40%, 60%, and 80% of the femur length prior to and after training. The EMG signals, obtained from the quadriceps muscles, were recorded during training and during maximal isometric contractions, prior to training, after 4 weeks and after 6 weeks of training. Repeated measure ANOVAs were used to determine if changes occurred within each group and to determine if the amount of change was different between groups. There was no overall difference between groups for type I fiber hypertrophy throughout the study. The mean increase in type II fiber CSA was greater in the concentric group than in the eccentric group. This difference occurred in the first 4 weeks of training. At nearly all levels the concentric group showed greater increase in all quadriceps muscles CSA than the eccentric group. Both concentric and eccentric groups increased their rmsEMG during maximal isometric contractions, with no difference between groups. There was a greater increase in maximal isometric force in the concentric group than in the eccentric group. The significant difference in maximal muscle force and lack of difference in the increased rmsEMG between training groups can be explained by the roles of other factors such as muscle hypertrophy that play a role in producing increased muscle force.
590 $a School code: 2383.
650 4 $a Health Sciences, Rehabilitation and Therapy. $3 1017926
650 4 $a Biology, Anatomy. $3 1021727
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773 0 $t Dissertation Abstracts International $g 60-06B.
790 1 0 $a Finucane, Sheryl D., $e advisor
790 1 0 $a Goldberg, Steven J., $e advisor
790 $a 2383
791 $a Ph.D.
792 $a 1999
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9935726