Investigation of the Effect of Core Stability Training on Balance, Trunk Muscle Endurance, and Athletic Performance of Poomsae Taekwondo Athletes with Trunk Impairment
Design
A controlled clinical trial with parallel groups, single-blind, randomized, phase II, conducted on 30 participants. Randomization will be performed using the RAND function in Excel.
Settings and conduct
All tests are conducted once before the intervention (training protocol) and once again after the intervention, and the results are recorded for each participant. Following the pre-tests, an eight-week core stability training program is implemented, consisting of three sessions per week, totaling 24 sessions. Each session lasts 60 minutes (10 minutes of warm-up and cool-down, 40 minutes of training program) and is conducted in groups at the Barzegari Taekwondo Academy.
Participants/Inclusion and exclusion criteria
Inclusion criteria: Male athletes active in Poomsae who regularly participate in sports activities. Age range between 18 and 25 years. Athletes’ sports experience of at least 5 years and a maximum of 10 years. Athletes with trunk impairment are identified using the Tuck Jump Test.
Exclusion criteria: Absence from two consecutive training sessions; presence of obvious dislocations or fractures in any part of the body; having other neurological disorders that may affect balance and muscle strength; having bone disorders or non-specific low back pain; sustaining a fracture or injury during training.
Intervention groups
ntervention group: Performs core stability exercises.
Control group: Receives no intervention and only continues their daily activities.
Main outcome variables
Balance, trunk muscle endurance, and athletic performance
General information
Reason for update
Acronym
IRCT registration information
IRCT registration number:IRCT20251216068361N1
Registration date:2025-12-20, 1404/09/29
Registration timing:prospective
Last update:2025-12-20, 1404/09/29
Update count:0
Registration date
2025-12-20, 1404/09/29
Registrant information
Name
Mehrdad Mohammadzadeh
Name of organization / entity
The University of Guilan
Country
Iran (Islamic Republic of)
Phone
+98 26 3226 1353
Email address
mohammadzadeh79@webmail.guilan.ac.ir
Recruitment status
Recruitment complete
Funding source
Expected recruitment start date
2025-12-22, 1404/10/01
Expected recruitment end date
2026-03-01, 1404/12/10
Actual recruitment start date
empty
Actual recruitment end date
empty
Trial completion date
empty
Scientific title
The effect of core stability exercises on balance, endurance of trunk muscles and sports performance of taekwondo poomsae athletes with trunk defect
Public title
The Effect of Core Stability Training on Functional Components in Poomsae Taekwondo Athletes
Purpose
Supportive
Inclusion/Exclusion criteria
Inclusion criteria:
Male athletes active in the poomsae discipline who regularly engage in their sports activities.
They should be within the age range of 18 to 25 years.
The athletes have a minimum of 5 years and a maximum of 10 years of sports experience.
Athletes with trunk impairment are identified using the Tuck Jump Test.
Exclusion criteria:
They should not have been absent from two consecutive training sessions.
They should not have any apparent dislocations or fractures.
They should not have any other neurological diseases that might affect balance and muscle strength.
They should not have bone diseases or non-specific low back pain (without a clear and specific cause).
They should not sustain a fracture or injury during training.
Age
From 18 years old to 25 years old
Gender
Male
Phase
N/A
Groups that have been masked
No information
Sample size
Target sample size:
30
Randomization (investigator's opinion)
Randomized
Randomization description
The individuals will be randomly placed in one of the two study groups with the help of a random number table and will receive the corresponding intervention.
Blinding (investigator's opinion)
Single blinded
Blinding description
Participants will be kept blind and will not be informed about how they are allocated to the study groups.
Placebo
Not used
Assignment
Parallel
Other design features
Secondary Ids
empty
Ethics committees
1
Ethics committee
Name of ethics committee
Ethics committee in biomedical research of Guilan university
Street address
5th kilometer of Persian Gulf Highway, Rasht, Guilan Province, Iran
City
Rasht
Province
Guilan
Postal code
4199613776
Approval date
2024-10-21, 1403/07/30
Ethics committee reference number
IR.GUILAN.REC.1403.145
Health conditions studied
1
Description of health condition studied
Taekwondo athletes with neuromuscular deficits in the trunk
ICD-10 code
M62.9
ICD-10 code description
Disorder of muscle, unspecified
Primary outcomes
1
Description
Balance
Timepoint
Measurement of balance tests before and after an eight week study
Method of measurement
Stork Balance Test and Star Excursion Balance Test
2
Description
Trunk Muscle Endurance
Timepoint
Measurement of trunk muscle endurance tests before and after an eight week study
Method of measurement
Trunk flexion test at 60°, Biering–Sorensen test, Right and left side bridge tests, Plank test
3
Description
Sport Performance
Timepoint
Measurement of Sport performance tests before and after an eight week study
Method of measurement
Taekwondo kick test series
Secondary outcomes
empty
Intervention groups
1
Description
Intervention group: Core stability exercises for eight weeks, three days per week, 60 minutes per session
Category
Rehabilitation
2
Description
Control group: During the eight weeks, the control group performed their regular Taekwondo training three days per week.
Category
Rehabilitation
Recruitment centers
1
Recruitment center
Name of recruitment center
Barzegari Taekwondo Academy
Full name of responsible person
Ali Barzegari
Street address
Shahid Beheshti Street, Foroughi Esfahani Street, Hafez and Saadi Towers
City
Karaj
Province
Alborz
Postal code
3153833862
Phone
+98 26 3226 1353
Email
alibarzegari1403@gmail.com
Sponsors / Funding sources
1
Sponsor
Name of organization / entity
University of Guilan
Full name of responsible person
Dr. Ali Bani
Street address
5th kilometer of Persian Gulf Highway, Rasht, Guilan Province, Iran
City
Rasht
Province
Guilan
Postal code
4199613776
Phone
+98 13 3332 8845
Email
bani@guilan.ac.ir
Grant name
Grant code / Reference number
Is the source of funding the same sponsor organization/entity?
No
Title of funding source
University of Guilan
Proportion provided by this source
100
Public or private sector
Public
Domestic or foreign origin
Domestic
Category of foreign source of funding
empty
Country of origin
Type of organization providing the funding
Academic
Person responsible for general inquiries
Contact
Name of organization / entity
University of Guilan
Full name of responsible person
Mehrdad Mohammadzadeh
Position
Student
Latest degree
Bachelor
Other areas of specialty/work
Corrective Exercises – Adapted Physical Education and Para-sports
Street address
5th kilometer of Persian Gulf Highway, Rasht, Guilan Province, Iran
City
Rasht
Province
Guilan
Postal code
4199613776
Phone
+98 13 3332 8845
Email
Mehrdadnft1579@gmail.com
Person responsible for scientific inquiries
Contact
Name of organization / entity
University of Guilan
Full name of responsible person
Mehrdad Mohammadzadeh
Position
Student
Latest degree
Bachelor
Other areas of specialty/work
Corrective Exercises – Adapted Physical Education and Para-sports
Street address
5th kilometer of Persian Gulf Highway, Rasht, Guilan Province, Iran
City
Rasht
Province
Guilan
Postal code
4199613776
Phone
+98 13 3332 8845
Email
mehrdadnft1579@gmail.com
Person responsible for updating data
Contact
Name of organization / entity
University of Guilan
Full name of responsible person
Mehrdad Mohammadzadeh
Position
Student
Latest degree
Bachelor
Other areas of specialty/work
Corrective Exercises – Adapted Physical Education and Para-sports
Street address
5th kilometer of Persian Gulf Highway, Rasht, Guilan Province, Iran
City
Rasht
Province
Guilan
Postal code
4199613776
Phone
+98 13 3332 8845
Email
mehrdadnft1579@gmail.com
Sharing plan
Deidentified Individual Participant Data Set (IPD)
Yes - There is a plan to make this available
Study Protocol
Yes - There is a plan to make this available
Statistical Analysis Plan
Yes - There is a plan to make this available
Informed Consent Form
Yes - There is a plan to make this available
Clinical Study Report
Yes - There is a plan to make this available
Analytic Code
Yes - There is a plan to make this available
Data Dictionary
Yes - There is a plan to make this available
Title and more details about the data/document
All data of the measured variables can be shared after de-identifying the participants.
When the data will become available and for how long
Data access begins from 2026
To whom data/document is available
Only for researchers affiliated with academic and scientific institutions.
Under which criteria data/document could be used
Scientific use for improvement and comparison with other studies is permitted.
From where data/document is obtainable
Email address for correspondence with the researcher to obtain necessary information: mehrdadnft1579@gmail.com
What processes are involved for a request to access data/document
The applicant must send the reason for using the documents via email, and after being reviewed by the researcher, a response will be provided as soon as possible. mehrdadnft1579@gmail.com