Injury Prevention in SportsJUDO-RCTNCT06929377
Effectiveness of a Judo-specific Injury Prevention Programme on Performance in Judo Athletes
A study testing IPPON warm-up programme in people with Injury Prevention in Sports and Sports Performance, run by Hacettepe University at 2 sites in Turkey (Türkiye).
Trial summary
Judo is a popular international combat sport with an estimated 20 million active participants world-wide and participation in judo entails a substantial risk of injury in both elite and recreational judo. Read more about this study
- Who is it for?
- Ages 13 years and olderHealthy volunteers can take part
- Conditions the study is for
- Injury Prevention in Sports, Sports Performance, Sports
- What is being tested?
- IPPON warm-up programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 40 participants
- Where
- 2 sitesTurkey (Türkiye)
- Study dates
- 1 May 2025to 1 Dec 2025
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 13 years and older
- All sexes
- Healthy volunteers accepted
- Child, Adult, Older adult
Who may be able to join
- age should be more than 13 years
- the asymptomatic judokas with no history of major injury or surgery in last 6 months,
- having experience in at least 3 years competitive judo,
- actively participating in competitive judo at least 1 year,
- competing at least in national level.
Who cannot join
- competing in paralympic sports,
- if they had any major injuries or surgeries in last 6 months,
- if they had any systemic, neurological or rheumatological diseases,
- being pre-pubertal stage (Tanner I) according to Tanner Scale,
- indicated their unwillingness to participate to this study.
Trial locations and contacts
2 sites in 1 country. Contact the study team or a site near you to ask about taking part.
Turkey (Türkiye)2 sites
Hacettepe University, Faculty of Physical Therapy and Rehabilitation
Ankara
SERCAN YILLI, +905335680674, sercanyilli@gmail.com
Hacettepe University
Ankara
SERCAN YILLI, MSc, +905335680674, sercanyilli@gmail.com
About this study
Official title: Effectiveness of a Judo-specific Injury Prevention Programme on Performance: a Randomized Controlled Trial in Judo Athletes
Judo is a popular international combat sport with an estimated 20 million active participants world-wide and participation in judo entails a substantial risk of injury in both elite and recreational judo. It is known that judo involves a significantly higher risk of sports per activity compared with another combat sports such as wrestling, karate, taekwondo an deven popular team sports such as football, basketball and volleyball. Therefore, preventing injuries in judo is so important and various interventions can use in this regard. These include; taping, warm-up and cool-down programs, proper technique trainings and exercise programs. Injury prevention programmes in other sports have been proven effective in reducing injury rates for elite and recreational athletes. In judo, research on exercise-based prevention is limited to the description of injury prevention programs, but the effectiveness of these programs has never been evaluated. The aim of this study is to investigate the effects of the judo-specific ''IPPON'' warm-up programs for injury prevention of judokas on performance parameters and incidence of injuries among professional judo athletes. In this study, the investigators research the Judo-Specific Special Conditioning Test and the Isometric/Dynamic Judogi Grip Strength Test will be evaluated for performance parameters. In addition, the Upper and Lower Extremity Y Balance Test will be evaluated for balance and the Upper Extremity Internal/External Rotation Strength Test and the Lower Extremity Hamstring/Quadriceps Strength Test will be evaluated for muscle strength assessment. The Turkish translation of the Oslo Trauma Research Center Overuse Questionnaire (OSTRC-O) will be used to monitor the incidence of injuries among professional judo athletes.
Read the detailed description
Judo is a popular international combat sport with an estimated 20 million active participants worldwide. Judo is characterised by the combination of balance, coordination, flexibility, agility, speed and strength with the aim to incapacitate their opponent. It is demanding of the neuromuscular and physical capacity of athletes. Participation in judo entails a substantial risk of injury in both elite and recreational judo. Injury prevention programmes in other sports have been proven effective in reducing injury rates for elite and recreational athletes. In judo, research on exercise-based prevention is limited to the description of injury prevention programmes, but the effectiveness of these programmes has never been evaluated. The main objective of our study was to evaluate the effectiveness of the bottom-up developed trainer-based IPPON intervention on the performance parameters compared with the usual warm-up in judo athletes. The secondary objectives were to evaluate injury severity, injury incidence, location-specific prevalences, time loss and sudden and gradual onset injury recurrence rates. We hypothesised that the IPPON intervention would increase performance parameters and reduce the overall injury prevalences. The IPPON intervention is an injury prevention programme designed specifically to reduce injuries in judo athletes. IPPON intervention mainly focuses on preventing musculoskeletal injuries of the shoulder, knee and ankle. The IPPON intervention consists of 36 exercises divided into (1) flexibility and agility, (2) balance and coordination and (3) strength and stability. Each category consisted of 12 exercises with 3 levels of difficulty. Athletes performed 4 exercises per category and thus 12 exercises at the start of the training at least two times per week. Prior to the intervention exercises, athletes completed running exercises and falling techniques. Athletes in the control group were instructed to continue their usual warm-up and regular judo practice as warm-up prior to training or competition is standard routine in judo. The duration of the IPPON intervention was aligned with the average duration of the usual warm-up in the control groups. Although, not measured in the study procedure, the approximate duration of warm-up was 15 min in both groups. The primary outcome was the performance parameters (Judo-Specific Special Conditioning Test, Isometric/Dynamic Judogi Grip Strength Test, Upper and Lower Extremity Y Balance Test, Upper Extremity Internal/External Rotation Strength Test, Lower Extremity Hamstring/Quadriceps Strength Test) over 8 weeks of follow-up, and secondary outcome was the overall injury prevalences (injury severity, injury incidence, location-specific prevalences, time loss and sudden and gradual onset injury recurrence rates) measured with the Turkish translation of the Oslo Trauma Research Center Overuse Questionnaire (OSTRC-O) at 2 weekly intervals over 16 weeks of follow-up.
- Conditions
- Injury Prevention in Sports, Sports Performance, Sports
- Being tested
- IPPON warm-up programme
- Keywords
- Judo, injury prevention, sports performance, a randomized controlled trial
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
IPPON warm-up programmeOther
The IPPON intervention is an injury prevention programme designed specifically to reduce injuries in judo athletes. The trainer-supervised IPPON intervention mainly focuses on preventing musculoskeletal injuries of the shoulder, knee and ankle. The IPPON intervention consists of 36 exercises divided into (1) flexibility and agility, (2) balance and coordination and (3) strength and stability. Each category consisted of 12 exercises with 3 levels of difficulty. Athletes performed 4 exercises per category and thus 12 exercises at the start of the training at least two times per week.
| Study group | Role | What they receive |
|---|---|---|
| Intervention Group - IPPON Group | Experimental | Intervention Group will be completed the judo specific exercise programme. It's called as ''IPPON'' warm-up programme. The IPPON intervention is an injury prevention programme designed specifically to reduce injuries in judo athletes.The IPPON intervention consists of 36 exercises divided into (1), flexibility and agility, (2) balance and coordination and (3) strength and stability. Each category consisted of 12 exercises with 3 levels of difficulty. Athletes performed 4 exercises per category and thus 12 exercises at the start of the training at least two times per week. Receives: Other: IPPON warm-up programme |
| Control Group | No intervention | Athletes in the control group were instructed to continue their usual warm-up and regular judo practice as warm-up prior to training or competition is standard routine in judo. The duration of the IPPON intervention was aligned with the average duration of the usual warm-up in the control groups. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Specific Judo Fitness Test (SJFT)
The SJFT formula is based ona total of throws (TT) made in three sets (1-15 s, 2-30 s, 3-30 s) separated by a 10 s break and heart rate (HR) collected immediately after the test and after 1 min with the inversely related index as the primary outcome [6]. During each period the athlete (tori) been evaluated throws two partners (uke A and B; far from each by 6 m) as many time as possible using the ippon-seoi-nage technique. Both uke A and B should have a similar height and weight from the tori. Just after and one minute after the test heart rate is measured.
Measured: 8 weeks
Isometric Judogi Grip Strength Test
Isometric judogi chin-up: the athletes were asked to keep their elbows flexed with their chin above the hands for as long as possible and holding time was clocked. The test was interrupted as soon as athletes were unable to maintain the initial isometric position. In this test, athletes were encouraged to maintain the position for as long as possible.
Measured: 8 weeks
Dynamic Judogi Grip Strength Test
Dynamic judogi chin-up: the athletes were asked to stretch their elbows completely and then flex them until the chin was above the bar and repetitions of the complete exercise were counted. Only repetitions which were carried out completely were counted, and the test was interrupted as soon as athletes were no longer able to carry out the proposed exercise completely and/or gave up voluntarily. In this test, athletes were encouraged to carry out as many dynamic repetitions as possible.
Measured: 8 weeks
Upper Extremity Y Balance Test (UQ-YBT)
UQ-YBT: All participants will be provided written instructions and then observed a demonstration performed by one of the investigators. In their socks or barefoot, the participants then assumed a pushup position with feet no greater than shoulder width apart. While maintaining the pushup position, the participant used his/her free hand to maximally reach, slowly and under control, in each of three directions Medial, Inferolateral, and Superolateral in a sequential order without the free hand touching down.
Measured: 8 weeks
Lower Extremity Y Balance Test (LQ-YBT)
LQ-YBT: Consisted of unilateral lower extremity reaches in the ANT, PM and PL directions. After written instructions were given and the test was demonstrated by one of the instructors, the participants were asked to keep their stance heel down and hands on hips while performing each reach direction with the non-stance leg in socks or barefoot. After a one-minute rest period, the participants will be completed three formal testing trials for each of the ANT, PM, and PL directions.
Measured: 8 weeks
Upper Extremity External/Internal Rotation (ER/IR) Muscle Strength Ratio
For the ER/IR muscle strength measurements, the Hand Held Dynamometer (Jamaar) will be placed 2 cm proximal of the processus styloideus ulnae, on the dorsal (ER strength) or ventral (IR strength) forearm during sitting position. Three repetitions of 5 seconds of maximal voluntary effort were performed using a ''make'' test (gradually increasing resistance up to maximum without ''breaking'' the subject's strength).
Measured: 8 weeks
Lower Extremity Hamstring/Quadriceps (H/Q) Muscle Strength Ratio
Participants performed two maximal isometric repetitions intending to flex and extend the knee in each lower limb to assess isometric hamstring and quadriceps strength, respectively. Before the onset of the testing, participants performed a standardized and specific warm-up. For quadriceps, test will be performed on a custom-built bench while participants are in a seated position at 30° of knee flexion and 90° of hip flexion with stabilization straps around the thighs. For hamstring, the participant will be seated at the edge of a table with the hip and knee flexed to 90 degrees and hands gripping the sides of the table while the clinician stabilizes the dynamometer between the participant's leg and table. H/Q ratio will be calculated.
Measured: 8 weeks
Secondary outcomes (1)
Oslo Trauma Research Center Overuse Questionnaire (OSTRC-O)
The OSTRC questionnaire is about overuse injury and health problems. These questionnaires are tools for injury and illness registration with four essential questions used to assess the severity. Scores in each symptom range from 0 to 100. The range of values in each question is from 0 to 25, with 0 representing no problem and 25 representing the maximum problem level in each question. Therefore, questions 1 and 4 are scored 0-8-17-25, and questions 2 and 3 are scored 0-6-13-19-25.
Measured: 16 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Apr 2025
- Study start1 May 2025 (estimated)
- Primary completion1 Sep 2025 (estimated)
- Study completion1 Dec 2025 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (5)Papers the sponsor has linked to this study.
- Other trials for Injury Prevention in SportsStudies of the same condition, open and under way.
- More trials run by Hacettepe UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Enrolment
- 40 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Hacettepe University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, SERCAN YILLI, Hacettepe University
- Investigators
- SERCAN YILLI, MSc, Principal investigator, Hacettepe UniversityELIF TURGUT, Professor, Principal investigator, Hacettepe University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06929377
- Sponsor's protocol ID
- 03.2025fbu
- Acronym
- JUDO-RCT
- Status last verified
- Apr 2025
- First submitted
- 27 Mar 2025
- Last updated
- 16 Apr 2025
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Malliaropoulos NG, Callan M, Johnson J. Comprehensive training programme for judo players nine plus 9+: possible lower limb primary injury prevention. Muscles Ligaments Tendons J. 2014 Jul 14;4(2):262-8. eCollection 2014 Apr. No abstract available.
PubMed 25332945Kamitani T, Malliaropoulos NG, Omiya M, Otaka Y, Inoue K, Onidani N. On the way to the Tokyo Summer Olympic Games (2020). Prevention of severe head and neck injuries in judo: it's time for action. Br J Sports Med. 2017 Nov;51(22):1581-1582. doi: 10.1136/bjsports-2017-097681. Epub 2017 Aug 17. No abstract available.
PubMed 28818954von Gerhardt AL, Vriend I, Verhagen E, Tol JL, Kerkhoffs GMMJ, Reurink G. Systematic development of an injury prevention programme for judo athletes: the IPPON intervention. BMJ Open Sport Exerc Med. 2020 Sep 29;6(1):e000791. doi: 10.1136/bmjsem-2020-000791. eCollection 2020.
PubMed 33033621Pocecco E, Ruedl G, Stankovic N, Sterkowicz S, Del Vecchio FB, Gutierrez-Garcia C, Rousseau R, Wolf M, Kopp M, Miarka B, Menz V, Krusmann P, Calmet M, Malliaropoulos N, Burtscher M. Injuries in judo: a systematic literature review including suggestions for prevention. Br J Sports Med. 2013 Dec;47(18):1139-43. doi: 10.1136/bjsports-2013-092886.
PubMed 24255909von Gerhardt AL, Reurink G, Kerkhoffs GMMJ, Verhagen E, Krabben K, Mooren J, Gal JSI, Brons A, Joorse R, van den Broek B, Kemler E, Tol JL. Effectiveness of a judo-specific injury prevention programme: a randomised controlled trial in recreational judo athletes. Br J Sports Med. 2023 Apr;57(8):450-456. doi: 10.1136/bjsports-2022-105869. Epub 2023 Jan 30.
PubMed 36717214
Study at a glance
From the registry record, last updated by the sponsor on 16 Apr 2025. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effectiveness of a Judo-specific Injury Prevention Programme on Performance: a Randomized Controlled Trial in Judo Athletes
- ClinicalTrials.gov ID
- NCT06929377
- Acronym / sponsor ID
- JUDO-RCT / 03.2025fbu
- Conditions
- Injury Prevention in Sports, Sports Performance, Sports
- Keywords
- Judo, injury prevention, sports performance, a randomized controlled trial
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 40 participants (estimated)
- Lead sponsor
- Hacettepe UniversityUniversity, hospital or other
- Study start
- 1 May 2025 (estimated)
- Primary completion
- 1 Sep 2025 (estimated)
- Study completion
- 1 Dec 2025 (estimated)
- First posted
- 16 Apr 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Judo is a popular international combat sport with an estimated 20 million active participants world-wide and participation in judo entails a substantial risk of injury in both elite and recreational judo. It is known that judo involves a significantly higher risk of sports per activity compared with another combat sports such as wrestling, karate, taekwondo an deven popular team sports such as football, basketball and volleyball. Therefore, preventing injuries in judo is so important and various interventions can use in this regard. These include; taping, warm-up and cool-down programs, proper technique trainings and exercise programs. Injury prevention programmes in other sports have been proven effective in reducing injury rates for elite and recreational athletes. In judo, research on exercise-based prevention is limited to the description of injury prevention programs, but the effectiveness of these programs has never been evaluated. The aim of this study is to investigate the effects of the judo-specific ''IPPON'' warm-up programs for injury prevention of judokas on performance parameters and incidence of injuries among professional judo athletes. In this study, the investigators research the Judo-Specific Special Conditioning Test and the Isometric/Dynamic Judogi Grip Strength Test will be evaluated for performance parameters. In addition, the Upper and Lower Extremity Y Balance Test will be evaluated for balance and the Upper Extremity Internal/External Rotation Strength Test and the Lower Extremity Hamstring/Quadriceps Strength Test will be evaluated for muscle strength assessment. The Turkish translation of the Oslo Trauma Research Center Overuse Questionnaire (OSTRC-O) will be used to monitor the incidence of injuries among professional judo athletes.
Detailed description
Judo is a popular international combat sport with an estimated 20 million active participants worldwide. Judo is characterised by the combination of balance, coordination, flexibility, agility, speed and strength with the aim to incapacitate their opponent. It is demanding of the neuromuscular and physical capacity of athletes. Participation in judo entails a substantial risk of injury in both elite and recreational judo. Injury prevention programmes in other sports have been proven effective in reducing injury rates for elite and recreational athletes. In judo, research on exercise-based prevention is limited to the description of injury prevention programmes, but the effectiveness of these programmes has never been evaluated. The main objective of our study was to evaluate the effectiveness of the bottom-up developed trainer-based IPPON intervention on the performance parameters compared with the usual warm-up in judo athletes. The secondary objectives were to evaluate injury severity, injury incidence, location-specific prevalences, time loss and sudden and gradual onset injury recurrence rates. We hypothesised that the IPPON intervention would increase performance parameters and reduce the overall injury prevalences. The IPPON intervention is an injury prevention programme designed specifically to reduce injuries in judo athletes. IPPON intervention mainly focuses on preventing musculoskeletal injuries of the shoulder, knee and ankle. The IPPON intervention consists of 36 exercises divided into (1) flexibility and agility, (2) balance and coordination and (3) strength and stability. Each category consisted of 12 exercises with 3 levels of difficulty. Athletes performed 4 exercises per category and thus 12 exercises at the start of the training at least two times per week. Prior to the intervention exercises, athletes completed running exercises and falling techniques. Athletes in the control group were instructed to continue their usual warm-up and regular judo practice as warm-up prior to training or competition is standard routine in judo. The duration of the IPPON intervention was aligned with the average duration of the usual warm-up in the control groups. Although, not measured in the study procedure, the approximate duration of warm-up was 15 min in both groups. The primary outcome was the performance parameters (Judo-Specific Special Conditioning Test, Isometric/Dynamic Judogi Grip Strength Test, Upper and Lower Extremity Y Balance Test, Upper Extremity Internal/External Rotation Strength Test, Lower Extremity Hamstring/Quadriceps Strength Test) over 8 weeks of follow-up, and secondary outcome was the overall injury prevalences (injury severity, injury incidence, location-specific prevalences, time loss and sudden and gradual onset injury recurrence rates) measured with the Turkish translation of the Oslo Trauma Research Center Overuse Questionnaire (OSTRC-O) at 2 weekly intervals over 16 weeks of follow-up.
Study design
- Primary purpose
- Prevention
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Intervention Group - IPPON Group | Experimental | Other: IPPON warm-up programmeIntervention Group will be completed the judo specific exercise programme. It's called as ''IPPON'' warm-up programme. The IPPON intervention is an injury prevention programme designed specifically to reduce injuries in judo athletes.The IPPON intervention consists of 36 exercises divided into (1), flexibility and agility, (2) balance and coordination and (3) strength and stability. Each category consisted of 12 exercises with 3 levels of difficulty. Athletes performed 4 exercises per category and thus 12 exercises at the start of the training at least two times per week. |
| Control Group | No intervention | –Athletes in the control group were instructed to continue their usual warm-up and regular judo practice as warm-up prior to training or competition is standard routine in judo. The duration of the IPPON intervention was aligned with the average duration of the usual warm-up in the control groups. |
Who may qualify
- Ages
- 13 years and older
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (5 listed)
- age should be more than 13 years
- the asymptomatic judokas with no history of major injury or surgery in last 6 months,
- having experience in at least 3 years competitive judo,
- actively participating in competitive judo at least 1 year,
- competing at least in national level.
Key exclusion criteria (5 listed)
- competing in paralympic sports,
- if they had any major injuries or surgeries in last 6 months,
- if they had any systemic, neurological or rheumatological diseases,
- being pre-pubertal stage (Tanner I) according to Tanner Scale,
- indicated their unwillingness to participate to this study.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| IPPON warm-up programmeThe IPPON intervention is an injury prevention programme designed specifically to reduce injuries in judo athletes. The trainer-supervised IPPON intervention mainly focuses on preventing musculoskeletal injuries of the shoulder, knee and ankle. The IPPON intervention consists of 36 exercises divided into (1) flexibility and agility, (2) balance and coordination and (3) strength and stability. Each category consisted of 12 exercises with 3 levels of difficulty. Athletes performed 4 exercises per category and thus 12 exercises at the start of the training at least two times per week. | Other | Intervention Group - IPPON Group |
Primary outcome
Specific Judo Fitness Test (SJFT)
Time frame: 8 weeks
The SJFT formula is based ona total of throws (TT) made in three sets (1-15 s, 2-30 s, 3-30 s) separated by a 10 s break and heart rate (HR) collected immediately after the test and after 1 min with the inversely related index as the primary outcome [6]. During each period the athlete (tori) been evaluated throws two partners (uke A and B; far from each by 6 m) as many time as possible using the ippon-seoi-nage technique. Both uke A and B should have a similar height and weight from the tori. Just after and one minute after the test heart rate is measured.
Isometric Judogi Grip Strength Test
Time frame: 8 weeks
Isometric judogi chin-up: the athletes were asked to keep their elbows flexed with their chin above the hands for as long as possible and holding time was clocked. The test was interrupted as soon as athletes were unable to maintain the initial isometric position. In this test, athletes were encouraged to maintain the position for as long as possible.
Dynamic Judogi Grip Strength Test
Time frame: 8 weeks
Dynamic judogi chin-up: the athletes were asked to stretch their elbows completely and then flex them until the chin was above the bar and repetitions of the complete exercise were counted. Only repetitions which were carried out completely were counted, and the test was interrupted as soon as athletes were no longer able to carry out the proposed exercise completely and/or gave up voluntarily. In this test, athletes were encouraged to carry out as many dynamic repetitions as possible.
Upper Extremity Y Balance Test (UQ-YBT)
Time frame: 8 weeks
UQ-YBT: All participants will be provided written instructions and then observed a demonstration performed by one of the investigators. In their socks or barefoot, the participants then assumed a pushup position with feet no greater than shoulder width apart. While maintaining the pushup position, the participant used his/her free hand to maximally reach, slowly and under control, in each of three directions Medial, Inferolateral, and Superolateral in a sequential order without the free hand touching down.
Lower Extremity Y Balance Test (LQ-YBT)
Time frame: 8 weeks
LQ-YBT: Consisted of unilateral lower extremity reaches in the ANT, PM and PL directions. After written instructions were given and the test was demonstrated by one of the instructors, the participants were asked to keep their stance heel down and hands on hips while performing each reach direction with the non-stance leg in socks or barefoot. After a one-minute rest period, the participants will be completed three formal testing trials for each of the ANT, PM, and PL directions.
Upper Extremity External/Internal Rotation (ER/IR) Muscle Strength Ratio
Time frame: 8 weeks
For the ER/IR muscle strength measurements, the Hand Held Dynamometer (Jamaar) will be placed 2 cm proximal of the processus styloideus ulnae, on the dorsal (ER strength) or ventral (IR strength) forearm during sitting position. Three repetitions of 5 seconds of maximal voluntary effort were performed using a ''make'' test (gradually increasing resistance up to maximum without ''breaking'' the subject's strength).
Lower Extremity Hamstring/Quadriceps (H/Q) Muscle Strength Ratio
Time frame: 8 weeks
Participants performed two maximal isometric repetitions intending to flex and extend the knee in each lower limb to assess isometric hamstring and quadriceps strength, respectively. Before the onset of the testing, participants performed a standardized and specific warm-up. For quadriceps, test will be performed on a custom-built bench while participants are in a seated position at 30° of knee flexion and 90° of hip flexion with stabilization straps around the thighs. For hamstring, the participant will be seated at the edge of a table with the hip and knee flexed to 90 degrees and hands gripping the sides of the table while the clinician stabilizes the dynamometer between the participant's leg and table. H/Q ratio will be calculated.
1 secondary outcome
Oslo Trauma Research Center Overuse Questionnaire (OSTRC-O)
Time frame: 16 weeks
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 16 Apr 2025.
- Background: PubMed 25332945Malliaropoulos NG, Callan M, Johnson J. Comprehensive training programme for judo players nine plus 9+: possible lower limb primary injury prevention. Muscles Ligaments Tendons J. 2014 Jul 14;4(2):262-8. eCollection 2014 Apr. No abstract available.
- Background: PubMed 28818954Kamitani T, Malliaropoulos NG, Omiya M, Otaka Y, Inoue K, Onidani N. On the way to the Tokyo Summer Olympic Games (2020). Prevention of severe head and neck injuries in judo: it's time for action. Br J Sports Med. 2017 Nov;51(22):1581-1582. doi: 10.1136/bjsports-2017-097681. Epub 2017 Aug 17. No abstract available.
- Background: PubMed 33033621von Gerhardt AL, Vriend I, Verhagen E, Tol JL, Kerkhoffs GMMJ, Reurink G. Systematic development of an injury prevention programme for judo athletes: the IPPON intervention. BMJ Open Sport Exerc Med. 2020 Sep 29;6(1):e000791. doi: 10.1136/bmjsem-2020-000791. eCollection 2020.
- Background: PubMed 24255909Pocecco E, Ruedl G, Stankovic N, Sterkowicz S, Del Vecchio FB, Gutierrez-Garcia C, Rousseau R, Wolf M, Kopp M, Miarka B, Menz V, Krusmann P, Calmet M, Malliaropoulos N, Burtscher M. Injuries in judo: a systematic literature review including suggestions for prevention. Br J Sports Med. 2013 Dec;47(18):1139-43. doi: 10.1136/bjsports-2013-092886.
- Background: PubMed 36717214von Gerhardt AL, Reurink G, Kerkhoffs GMMJ, Verhagen E, Krabben K, Mooren J, Gal JSI, Brons A, Joorse R, van den Broek B, Kemler E, Tol JL. Effectiveness of a judo-specific injury prevention programme: a randomised controlled trial in recreational judo athletes. Br J Sports Med. 2023 Apr;57(8):450-456. doi: 10.1136/bjsports-2022-105869. Epub 2023 Jan 30.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
SERCAN YILLI, MSc principal investigator
Hacettepe University
ELIF TURGUT, Professor principal investigator
Hacettepe University
2 sites in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing IPPON warm-up programme in people with Injury Prevention in Sports and Sports Performance, run by Hacettepe University at 2 sites in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 5 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: opening soon, as of the sponsor's last update on 16 Apr 2025. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 2 sites in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact SERCAN YILLI, MSc (+905335680674, sercanyilli@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Specific Judo Fitness Test (SJFT) (time frame: 8 weeks). The study lists 7 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT06929377, which also lists 5 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 16 Apr 2025.