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Title: Scapular kinematic alterations during arm elevation with decrease in pectoralis minor stiffness after stretching in healthy individuals
Authors: Umehara, Jun
Nakamura, Masatoshi
Nishishita, Satoru
Tanaka, Hiroki
Kusano, Ken
Ichihashi, Noriaki
Author's alias: 梅原, 潤
中村, 雅俊
西下, 智
田中, 浩基
草野, 拳
市橋, 則明
Keywords: Shoulder
physical therapy
biomechanics
stretching
muscle stiffness
elastography
pectoralis minor muscle
Issue Date: Jul-2018
Publisher: Elsevier BV
Journal title: Journal of Shoulder and Elbow Surgery
Volume: 27
Issue: 7
Start page: 1214
End page: 1220
Abstract: Background: Pectoralis minor tightness may be seen in individuals with scapular dyskinesis, and stretching is used for the treatment of altered scapular motion in sports and clinical fields. However, few researchers have reported on the effects of pectoralis minor stiffness on scapular motion during arm elevation. This study investigated whether an acute decrease of pectoralis minor stiffness after stretching changes the scapular motion during arm elevation. Methods: The study allocated 15 dominant and 15 nondominant upper limbs in healthy men as control and interventional limbs, respectively. In the intervention limb group, the shoulder was passively and horizontally abducted at 150° of elevation for 5 minutes to stretch the pectoralis minor muscle. Before and after stretching, an electromagnetic sensor was used to examine 3-dimensional scapular motion during abduction and scaption. Ultrasonic shear wave elastography was used to measure pectoralis minor stiffness before and immediately after stretching and after arm elevation. Results: In the interventional limb, pectoralis minor stiffness decreased by 3.2 kPa immediately after stretching and by 2.5 kPa after arm elevation. The maximal changes in scapular kinematics after stretching were 4.8° of external rotation and 3.3° of posterior tilt in abduction, and 4.5° of external rotation and 3.7° of posterior tilt in scaption. Upward rotation in abduction or scaption did not change. Conclusions: Stretching for the pectoralis minor muscle increases external rotation and posterior tilt of the scapula during arm elevation.
Rights: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/244286
DOI(Published Version): 10.1016/j.jse.2018.02.037
PubMed ID: 29602634
Appears in Collections:Journal Articles

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