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NCT Number: NCT04755257

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

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Key information

Conditions

Muscle Architecture Isokinetic Rotator Muscle Shoulder

Age range

18 year–25 year

Sex eligibility

Male

Study type

Observational

Primary location

Ankara Yıldırım Beyazıt University, Faculty of Health Sciences, Department of Physiotherapy and Rehabilitation

Ankara, Etlik, 06010, Turkey (Türkiye)

Who can participate

Only the study team can determine whether someone qualifies for participation.

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

Treatment and study plan

Isokinetic test

Device

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.

Primary outcomes

  1. concentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

    Time frame: Six month

    concentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

  2. concentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

    Time frame: Six month

    concentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

  3. 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)

    Time frame: 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)

  4. 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)

    Time frame: 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)

  5. eccentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

    Time frame: Six month

    eccentric shoulder internal rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

  6. eccentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

    Time frame: Six month

    eccentric shoulder external rotation peak torque and peak torque/weight at the angular velocity of 60˚/s in Method I (scapular position)

  7. 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)

    Time frame: 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)

  8. 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)

    Time frame: 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)

Sponsors and collaborators

Lead sponsor

Ankara Yildirim Beyazıt University

Other

Registry information

Important dates

Study start
2019
Primary completion
2020
Study completion
2020
First posted
Feb 16, 2021
Registry last updated
Feb 16, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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