Protocol summary
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Study aim
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The study compares the effects of static stretching, slow dynamic stretching, and fast dynamic stretching on performance recovery, flexibility, balance, speed, and agility after a functional fatigue protocol in football players. Additionally, it aims to identify the most effective stretching technique for maintaining or enhancing performance after fatigue in football players.
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Design
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The present study includes 40 participants. The participants will be randomly assigned to four groups—static stretching, fast dynamic stretching, slow dynamic stretching, and control—using simple randomization and the method of random assignment by drawing names from a ball.
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Settings and conduct
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In the present study, participants will perform the research interventions and the fatigue protocol at their training location.
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Participants/Inclusion and exclusion criteria
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Participants must have a body mass index (BMI) of 20-25 and no history of lower limb injury, trauma, or disease in the past six years, along with a limited range of motion. Additionally, they must have at least three years of regular training experience in football (three sessions per week) and should not be simultaneously participating in any other lower limb stretching program.
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Intervention groups
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The present study includes four groups: static stretching, fast dynamic stretching, slow dynamic stretching, and control. The first three groups perform their intervention program in a single session following a functional fatigue protocol, while the control group does not receive any intervention after fatigue.
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Main outcome variables
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The outcome variables of the present study are improvement in balance, flexibility, agility, and vertical jump performance.
General information
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Reason for update
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Since this study was conducted in a single-blind manner, the blinding procedure section has been updated.
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Acronym
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IRCT registration information
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IRCT registration number:
IRCT20230612058457N5
Registration date:
2025-03-07, 1403/12/17
Registration timing:
prospective
Last update:
2025-08-29, 1404/06/07
Update count:
2
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Registration date
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2025-03-07, 1403/12/17
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Registrant information
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Recruitment status
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Recruitment complete
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Funding source
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Expected recruitment start date
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2025-03-24, 1404/01/04
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Expected recruitment end date
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2025-04-02, 1404/01/13
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Actual recruitment start date
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empty
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Actual recruitment end date
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empty
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Trial completion date
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empty
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Scientific title
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The role of stretching protocols in enhancing post-fatigue performance and flexibility in soccer
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Public title
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Comparison of three stretching protocols after fatigue in football players
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Purpose
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Prevention
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Inclusion/Exclusion criteria
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Inclusion criteria:
Body Mass Index (BMI) 20-25
No history of lower limb injury, trauma, or disease in the past six years, with limited range of motion.
Participants must have at least three years of regular training experience in football (three sessions per week).
No participation in a lower limb stretching program.
Participants should be aged between 18-25 years old.
Exclusion criteria:
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Age
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From 18 years old to 25 years old
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Gender
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Male
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Phase
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N/A
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Groups that have been masked
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Sample size
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Target sample size:
40
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Randomization (investigator's opinion)
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Randomized
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Randomization description
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In the present study, participants are randomly assigned to four groups—static, slow dynamic, fast dynamic, and control—using a lottery draw method by pulling names from a ball.
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Blinding (investigator's opinion)
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Single blinded
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Blinding description
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After assigning participants to each group, the outcome assessor was unaware of (or: was blinded to) the group allocation.
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Placebo
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Not used
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Assignment
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Parallel
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Other design features
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Ethics committees
1
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Ethics committee
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Approval date
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2025-02-17, 1403/11/29
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Ethics committee reference number
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IR.BASU.REC.1403.064
Health conditions studied
1
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Description of health condition studied
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Comparison of three types of stretching protocols pre and post of functional fatigue in soccer players
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ICD-10 code
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ICD-10 code description
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Primary outcomes
1
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Description
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In the present study, flexibility is being examined.
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Timepoint
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Before and after the application of the fatigue protocol.
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Method of measurement
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Flexibility is assessed using the modified Thomas test and PKET.
2
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Description
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In the present study, balance is being investigated.
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Timepoint
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Before and after the application of the fatigue protocol.
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Method of measurement
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Balance is measured using the Y Balance Test.
3
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Description
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In the present study, agility is being investigated.
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Timepoint
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Before and after the application of the fatigue protocol.
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Method of measurement
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Agility is evaluated using the Illinois Agility Test
4
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Description
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In the present study, speed is being examined.
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Timepoint
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Before and after the application of the fatigue protocol.
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Method of measurement
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Speed is assessed using the 20-meter sprint test.
5
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Description
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In the present study, vertical jump is being examined.
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Timepoint
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Before and after the application of the fatigue protocol.
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Method of measurement
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Vertical jump is assessed using the countermovement jump test.
Intervention groups
1
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Description
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Intervention group: Static stretching of the hamstrings and quadriceps will include standing hamstring stretches (standing with feet hip-width apart and knees straight, participants bend forward while lowering their heads and wrapping their hands around the calf of one leg) followed by calf raises (from an initial standing position with knees straight, participants raise one leg upward while bending at the hip). Quadriceps stretching will be performed using a standing quadriceps stretch (participants stand on one leg while bending the opposite knee and holding it behind them with one hand for balance) followed by lunges (participants position one foot forward and one foot back while bending the front knee). Each stretch will be held for 30 seconds with two repetitions (once for each leg).
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Category
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Prevention
2
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Description
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Intervention group: The fast dynamic group will perform the stretches like the static group, with the only difference being that each movement will be done at 100 beats per minute.
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Category
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Prevention
3
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Description
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Intervention group: The fast dynamic group will perform the stretches like the static group, with the only difference being that each movement will be done at 50 beats per minute.
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Category
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Prevention
4
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Description
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Control group: The control group will engage in 5 minutes of active rest in the form of walking.
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Category
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Prevention
1
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Sponsor
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Grant name
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Grant code / Reference number
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Is the source of funding the same sponsor organization/entity?
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Yes
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Title of funding source
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The University of Bu-Ali Sina
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Proportion provided by this source
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100
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Public or private sector
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Public
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Domestic or foreign origin
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Domestic
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Category of foreign source of funding
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empty
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Country of origin
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Type of organization providing the funding
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Academic
Sharing plan
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Deidentified Individual Participant Data Set (IPD)
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Yes - There is a plan to make this available
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Study Protocol
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Yes - There is a plan to make this available
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Statistical Analysis Plan
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Yes - There is a plan to make this available
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Informed Consent Form
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Yes - There is a plan to make this available
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Clinical Study Report
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No - There is not a plan to make this available
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Analytic Code
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Yes - There is a plan to make this available
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Data Dictionary
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Yes - There is a plan to make this available
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Title and more details about the data/document
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All data will be shared after anonymizing individuals, ensuring their non-identifiability.
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When the data will become available and for how long
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The data access period will start immeduately after the results are printed.
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To whom data/document is available
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The data will be made available to researchers, organizations, and institutions related to the field of football and also for publication in accessible journals.
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Under which criteria data/document could be used
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In order to assist scientific research and promote the implementation of executive goals with a focus on reducing musculoskeletal injuries and enhancing the performance of football players in the field,
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From where data/document is obtainable
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Mohammad Alimoradi/malimoradi@sport.uk.ac.ir
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What processes are involved for a request to access data/document
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Requests for access to data will be answered within a week
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Comments
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