COVID-19 is an emerging, rapidly evolving situation.
Get the latest public health information from CDC:

Get the latest research information from NIH: Menu

Determining the Number of Repetitions Specific Isokinetic Knee Evaluation Protocols

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT03355183
Recruitment Status : Completed
First Posted : November 28, 2017
Last Update Posted : May 16, 2018
Information provided by (Responsible Party):
Ankara Yildirim Beyazıt University

Brief Summary:
The aim of this study is to determine the repetition numbers of the peak force value generated during isokinetic knee flexion and extensor movement evaluation at 60 and 180 °/ sec angular velocities and to identify the factors associated with this repetition.

Condition or disease Intervention/treatment Phase
Sports Physical Therapy Other: Isokinetics Not Applicable

Detailed Description:
Individual evaluation in the field of health; is very important because it sets out the steps necessary for defining and improving the current situation. Evaluation of muscular strength is a key factor in sports to improve performance and determine the risk of injury. Thus, the training and training process that will optimize the performance of the athlete can be planned and necessary steps can be taken to prevent injuries. There are many methods to determine muscle strength, manual muscle testing and isokinetic evaluation are the most frequently used methods. Isokinetic evaluation provides the ability to objectively measure dynamic force. Potential injuries are avoided by providing effective and optimal loading of joints and muscles throughout the range of motion. With isokinetic dynamometry, it can measure and amplify at high speed with maximal contraction using muscle function at full speed over the entire range of motion. With this method, it is possible to assess the strength of the muscles of the joint movements in the agonist (the group performing the movement as a primer) and the antagonist (the muscle group controlling the movement in the movement) during all reciprocal movements. One of the most important values of this evaluation is the peak torque, the maximum force. The peak torque value is influenced by many internal factors such as the environmental factors, the adaptation of the isokinetic instrument to the person, as well as the internal factors of the person being assessed. One of the most important of the effective factors is to determine the appropriate number of repetitions. Isokinetic dynamometers offer the possibility to make various adjustments such as angular velocity, number of repetitions, the range of motion, the current state of the person. Therefore, the evaluator can determine the number of repetitions itself. Sufficient repeatability is required to allow the individual to create maximum force. However, too much repetition can cause fatigue in the individual as well as an additional workload in terms of time. There are many studies in the literature carried out with different repeat numbers at different angular velocities. The studies include protocols ranging from five repetitions to twenty repetitions with very different repeat numbers. Five repetitions may not be sufficient for the peak torque to appear, but twenty repetitions cause fatigue in the athlete and lead to loss of time. There is no standardized repeat number for isokinetic knee evaluation in the literature. The lack of consensus on the number of repetitions hampers the interpretation of the works. In our work, it will be determined how many times the athletes reached peak torque values. This will prevent future studies from carrying out an incorrect measurement without reaching the maximum peak force with a low number of repetitions, or having too many repetitions to include tougher, longer evaluations. Standardization of repeat numbers will make evaluation easier and more meaningful if it increases the objectivity of evaluation.

Layout table for study information
Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 196 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Screening
Official Title: Determining the Number of Repetitions Specific to Angular Speed of 60°\ Second and 180°\ Second in Establishing Isokinetic Knee Evaluation Protocols
Actual Study Start Date : May 10, 2017
Actual Primary Completion Date : November 30, 2017
Actual Study Completion Date : December 1, 2017

Arm Intervention/treatment
Experimental: Healthy athletes
Muscular strength of healthy athletes who are not physically disabled and doing sports for 3 years as a professional will be measured by isokinetic dynamometer.
Other: Isokinetics
Isokinetics, or accommodating resistance, is a form of exercise where a person provides a maximum muscle contraction against a resistance or lever arm, (isokinetic dynamometer) at a fixed speed through a given range of motion. This type of muscle action can be done either concentrically or eccentrically at the given joint.

Primary Outcome Measures :
  1. Isokinetic muscle strength's [ Time Frame: 1 month ]
    the repetetion numbers of the peak force value generated during isokinetic knee flexion and extensor movement evaluation at 60 and 180 ° / will be assested with ISOMED 2000 device

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Layout table for eligibility information
Ages Eligible for Study:   14 Years to 40 Years   (Child, Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Do sports for at least 3 years
  • To have physical and mental fitness to perform isokinetic evaluation
  • Being a mid-level workout (2-4 times a week)
  • Volunteer to participate in the work.

Exclusion Criteria:

  • • Hip, knee, ankle and back injuries in the last year

    • Having undergone lower extremity surgery
    • Having obstructive conditions such as muscular shortening that would prevent the movement gap to be standardized for isokinetic evaluation
    • Having a discomfort to affect neuromuscular control
    • In the last 6 months, intraarticular injection has been applied to the knee joint

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT03355183

Layout table for location information
Ankara Yıldırım Beyazıt Üniversitesi
Ankara, Turkey
Sponsors and Collaborators
Ankara Yildirim Beyazıt University
Layout table for additonal information
Responsible Party: Ankara Yildirim Beyazıt University Identifier: NCT03355183    
Other Study ID Numbers: 34
First Posted: November 28, 2017    Key Record Dates
Last Update Posted: May 16, 2018
Last Verified: May 2018

Layout table for additional information
Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Ankara Yildirim Beyazıt University: