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Scapular position and shoulder girdl...

The University of Toledo.

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Scapular position and shoulder girdle muscular activation during isometric contractions, comparisons between young and older adults.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Scapular position and shoulder girdle muscular activation during isometric contractions, comparisons between young and older adults./
Author:	Timmons, Mark K.
Description:	105 p.
Notes:	Adviser: Danny M. Pincivero.
Contained By:	Dissertation Abstracts International68-08B.
Subject:	Health Sciences, Medicine and Surgery. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3279602
ISBN:	9780549203322

Scapular position and shoulder girdle muscular activation during isometric contractions, comparisons between young and older adults.
Timmons, Mark K.

Scapular position and shoulder girdle muscular activation during isometric contractions, comparisons between young and older adults. - 105 p.

Adviser: Danny M. Pincivero.

Thesis (Ph.D.)--The University of Toledo, 2007.

The incidence of shoulder pathology is known to increase with increasing age. Altered scapular orientation and motion has also been associated with shoulder pathologies. However, the effect of age on the orientation of the scapula is not well understood. The purpose of this investigation was to explore differences between younger and older healthy adults in the effects of arm abduction angle and isometric muscular activity on the orientation of the scapula. Twenty-seven healthy adult volunteers, 13 older (58.6 +/- 6.2 years) (OA) and 14 younger (23.2 +/- 2.5 years) (YA) participated in this investigation. Scapular position (SP) was determined during maximal and sub-maximal (10-90% MVC) constant force isometric abduction contraction in the plane of the scapula. Contractions were performed with the arm at 30°, 60° and 90° of arm abduction (AA). During each contraction, the electromyogram (EMG) was recorded from the scapular rotator, Deltoid, Bicep Brachii, Infraspinatus, and Latissimus Dorsi muscles.

ISBN: 9780549203322Subjects--Topical Terms:

1017756
Health Sciences, Medicine and Surgery.

Scapular position and shoulder girdle muscular activation during isometric contractions, comparisons between young and older adults.
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020 $a 9780549203322
035 $a (UMI)AAI3279602
035 $a AAI3279602
040 $a UMI $c UMI
100 1 $a Timmons, Mark K. $3 1043240
245 1 0 $a Scapular position and shoulder girdle muscular activation during isometric contractions, comparisons between young and older adults.
300 $a 105 p.
500 $a Adviser: Danny M. Pincivero.
500 $a Source: Dissertation Abstracts International, Volume: 68-08, Section: B, page: 5176.
502 $a Thesis (Ph.D.)--The University of Toledo, 2007.
520 $a The incidence of shoulder pathology is known to increase with increasing age. Altered scapular orientation and motion has also been associated with shoulder pathologies. However, the effect of age on the orientation of the scapula is not well understood. The purpose of this investigation was to explore differences between younger and older healthy adults in the effects of arm abduction angle and isometric muscular activity on the orientation of the scapula. Twenty-seven healthy adult volunteers, 13 older (58.6 +/- 6.2 years) (OA) and 14 younger (23.2 +/- 2.5 years) (YA) participated in this investigation. Scapular position (SP) was determined during maximal and sub-maximal (10-90% MVC) constant force isometric abduction contraction in the plane of the scapula. Contractions were performed with the arm at 30°, 60° and 90° of arm abduction (AA). During each contraction, the electromyogram (EMG) was recorded from the scapular rotator, Deltoid, Bicep Brachii, Infraspinatus, and Latissimus Dorsi muscles.
520 $a The results revealed that both groups displayed a similar pattern of scapular upward rotation with increased AA. Isometric abduction contraction produced a downward rotation (DR) of the scapula from the resting position. The magnitude of the DR was dependant on the intensity of the contraction. The OA group had more scapular DR than the YA group during the MVC at the 90° arm abduction position.
520 $a Differences in muscle activation occurred in all muscles with increasing contraction intensity and arm abduction angle. The IEMG increased with increasing arm abduction angle while the EMG median frequency (MDF) decreased with arm abduction. The EMG MDF decreased with increasing contraction intensity. Group differences were found in the analysis of the EMG signal in both the time and frequency domain. The OA group showed lower IEMG of the of the Bicep Brachii, Infraspinatus, Latissimus Dorsi and Upper Trapezium muscles. The OA group showed lower EMG MDF in the Deltoid, Latissimus Dorsi and Upper Trapezium muscle. The differences in SP seen between OA and YA groups at high intensity isometric muscle contraction may result from the lower activation of the muscles that upwardly rotate the scapula as well as stabilize the glenohumeral joint.
590 $a School code: 0232.
650 4 $a Health Sciences, Medicine and Surgery. $3 1017756
650 4 $a Health Sciences, Recreation. $3 1018003
650 4 $a Health Sciences, Rehabilitation and Therapy. $3 1017926
690 $a 0382
690 $a 0564
690 $a 0575
710 2 $a The University of Toledo. $3 1023352
773 0 $t Dissertation Abstracts International $g 68-08B.
790 $a 0232
790 1 0 $a Pincivero, Danny M., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3279602