Development of the Muscle Architecture Based Isokinetic Strength Assessment Position for Shoulder Rotator Muscles

Today, the most commonly used position is the seated position with 45° of shoulder abduction (Abd) in the scapular plane, known as the most functional isokinetic assessment of shoulder-rotator strength (1). However, considering the architectural feature of the rotator muscles, a position where the maximum sarcomere length is obtained, in which the maximum muscle strength is produced, has not been investigated. Ward et al. showed that the shoulder position, in which the sarcomere length of the muscles was between 2.0 - 2.6 µm, was 25⁰ Abd and 20⁰ external rotation (ER) as a result of their study on the rotator cuff muscles architecture (2). The test position selected in isokinetic measurements is the main factor for outcome measurements and the repeatability of the measurements directly depends on the selected position (3). This study was planned to investigate the effects of the position where the shoulder is at 25⁰ Abd and 20⁰ ER to develop the most suitable isokinetic strength evaluation position based on muscle architecture for shoulder rotator muscles.Using IsoMed 2000 device (D. & R. Ferstl GmbH, Hemau, Germany) we conducted the isokinetic test of concentric (CON) and eccentric (ECC) shoulder internal (IR) and external (ER) strength at the angular velocity of 60˚/s in both Method I (scapular position) and Method II (25⁰ Abd and 20⁰ ER). There were seven days between the testing sessions, and both tests were conducted at the same time of day. The same examiner with experience in performing isokinetic testing with IsoMed 2000 tested all subjects in both testing sessions

Study Overview

• Status: Completed
• Conditions: Shoulder; Muscle Architecture; Isokinetic; Rotator Muscle
• Intervention / Treatment: Device: Isokinetic test

• Study Type: Observational
• Enrollment (Actual): 52

Contacts and Locations

Study Locations

• Turkey
  • Etlik
    • Ankara, Etlik, Turkey, 06010
      • Ankara Yıldırım Beyazıt University, Faculty of Health Sciences, Department of Physiotherapy and Rehabilitation

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 25 years (Adult)
• Accepts Healthy Volunteers: N/A
• Genders Eligible for Study: Male

• Sampling Method: Probability Sample

Study Population

healthy male subjects

Description

Inclusion Criteria:

• Being between the ages of 18-25
• Body mass index (BMI) being between 18.5-24.9 kg / m 2
• Volunteering to participate in the study
• Having the skills to do the tests and exercises to be applied

Exclusion Criteria:

• Having a history of upper extremity injury within the past year
• Having a sensory problem that prevents participation in the study
• Have any musculoskeletal, neurological, respiratory, or cardiovascular risk factors that limit exercise
• Having a history of malignant disease

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
concentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	concentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	Six month
concentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	concentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	Six month
concentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	concentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	Six month
concentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	concentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	Six month
eccentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	eccentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	Six month
eccentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	eccentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)	Six month
eccentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	eccentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	Six month
eccentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	eccentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method II (25⁰ Abd and 20⁰ ER)	Six month

Collaborators and Investigators

• Sponsor: Ankara Yildirim Beyazıt University
• Investigators: Principal Investigator: Caglar Soylu, PhD, Ankara Yildirim Beyazıt University

Study record dates

Study Major Dates

• Study Start (Actual): November 15, 2019
• Primary Completion (Actual): January 15, 2020
• Study Completion (Actual): May 15, 2020

Study Registration Dates

• First Submitted: February 11, 2021
• First Submitted That Met QC Criteria: February 11, 2021
• First Posted (Actual): February 16, 2021

Study Record Updates

• Last Update Posted (Actual): February 16, 2021
• Last Update Submitted That Met QC Criteria: February 11, 2021
• Last Verified: February 1, 2021

More Information

Terms related to this study

• Keywords: Shoulder; Isokinetic; Muscle Architecture; Rotator muscle
• Other Study ID Numbers: 2019-367

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No