title: Comparative analysis of acromiohumeral distances according to the locations of the arms and humeral rotation.
abstract: [Purpose] The purpose of this study was to compare the potential effects of resistance exercise according to the positions of the arms and the rotation of the humerus on the subhumeral acromial space. [Subjects] The study subjects were 34 subjects without shoulder pain. [Methods] Ultrasonographic measurements of the acromiohumeral distance of the subjects were made at three shoulder positions: 90° flexion, scaption at 90° abduction, and 90° abduction in an upright sitting position. The subjects were instructed to vertically push against a table to the maximum level with the humerus in internal, neutral, and external rotation. The measurements were made three times in each position. [Results] There was a significant difference in acromiohuneral distance between neutral and internal rotation of the humerus, and between external rotation and internal rotation of the humerus. In the scaption position, there was a significant difference between neutral and internal rotation of the humerus, and between external rotation and internal rotation of the humerus. In the 90° flexion position, there was a significant difference between neutral and internal rotation, and between neutral and external rotation. There was a significant difference between the flexion position and the abduction position, and between the flexion position and the scaption position. In terms of the internal rotation of the humerus, there was a significant difference between 90° flexion and 90° abduction. [Conclusion] These findings can be applied in exercises prescribed to increase the acromiohumeral distance and to aid the treatment and evaluation of shoulder dysfunctions.
authors.affiliation: Department of Physical Therapy, College of Rehabilitation Science, Daegu University, Republic of Korea.
authors.forename: Haroo
authors.initials: H
authors.lastname: Kim
authors.affiliation: Department of Physical Therapy, College of Rehabilitation Science, Daegu University, Republic of Korea.
authors.forename: Boin
authors.initials: B
authors.lastname: Kim
authors.affiliation: Department of Physical Therapy, College of Health and Sciences, Kangwon National University, Republic of Korea.
authors.forename: Jemyung
authors.initials: J
authors.lastname: Shim
authors.affiliation: Department of Physical Therapy, Graduate School, Catholic University of Pusan, Republic of Korea.
authors.forename: Haeyeon
authors.initials: H
authors.lastname: Kwon
authors.affiliation: Department of Physical Therapy, Rehabilitation Center, Gimhae Good morning Hospital.
authors.forename: Juhyeon
authors.initials: J
authors.lastname: Jung
keywords: Acromiohumeral distance; Humeral rotation; Ultrasonographic