Postural BalanceNCT07417332
Determination of the Degree of Dynamic Stability of the Foot in Single-leg Support in Relation to the Foot Posture Index in Judokas
An observational study of Postural Balance and Foot Posture, run by Fundación Universidad Católica de Valencia San Vicente Mártir at 1 site in Spain.
Trial summary
The goal of this observational study is to examine the relationship between foot type and dynamic stability (balance while standing on one leg) in judo athletes. Judo requires excellent balance to perform techniques effectively and avoid injuries. Read more about this study
- Who is it for?
- Ages 15 to 40 yearsHealthy volunteers can take part
- Conditions the study is for
- Postural Balance, Foot Posture, Sports Injuries
- What is being tested?
- Postural and Balance Assessment
- How many people
- 45 participants
- Where
- 1 siteSpain
- Study dates
- 1 Mar 2023to 26 Jun 2023
- Phase
- Observational
- Are there results?
- None posted in the registry
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 15 to 40 years
- All sexes
- Healthy volunteers accepted
- Child, Adult
Study population: Federated judo athletes aged 15 to 40 years from judo clubs in the Galician provinces of A Coruña and Pontevedra (Spain), with at least 3 years of practice and regular weekly training.
Who may be able to join
- Federated judo athletes between 15 and 40 years of age.
- Minimum of 3 years practicing judo.
- At least 2 judo training sessions per week.
- Ability to understand and follow study instructions.
- Signed informed consent (and parental consent for minors, if applicable).
Who cannot join
- Presence of any systemic disease that may cause morphological or biomechanical alterations of the lower limbs.
- Current biomechanical limitations of the lower limbs that prevent safe performance of the Y Balance Test.
- History of recent lower limb surgery or spinal surgery that may interfere with balance assessment.
- Refusal to undergo measurements or to have data collected at the time of evaluation.
Trial locations and contacts
1 site in 1 country.
Spain1 site
Catholic University of Valencia San Vicente Mártir
Valencia, Valencia, 46001
About this study
The goal of this observational study is to examine the relationship between foot type and dynamic stability (balance while standing on one leg) in judo athletes. Judo requires excellent balance to perform techniques effectively and avoid injuries. However, there is limited scientific knowledge about how foot posture affects balance in judokas.
The main questions this study aims to answer are:
Read more
- Does foot type (neutral, pronated, or supinated) affect dynamic stability in judokas?
- Are there differences in balance between male and female judokas?
- Does injury history affect dynamic stability?
- Is there a difference in balance between the dominant and non-dominant foot?
Participants in this study will:
- Have their foot type assessed using the Foot Posture Index (FPI-6), a clinical tool that evaluates foot alignment
- Perform the Y Balance Test, which measures how far they can reach in three directions while standing on one leg
- Complete a questionnaire about their training history, injuries, and demographic information
All assessments will be conducted in the participants' judo training facilities (tatami) during a single session.
Researchers will compare three groups of judokas (those with neutral, pronated, and supinated feet) to see if foot type influences balance performance. This information may help coaches and healthcare professionals better assess athletes, prevent injuries, and improve sports performance in judo.
Read the detailed description
Judo is a combat sport that places high demands on dynamic postural control due to continuous changes in stance, center of mass, and base of support during throws, defenses, and transitions between standing and ground fighting. Alterations in foot posture (neutral, pronated, or supinated) may modify lower limb biomechanics and could influence dynamic stability and injury risk, but this relationship has not been specifically examined in adult judokas.
This cross-sectional observational study was conducted in federated judokas from clubs in the Galician provinces of A Coruña and Pontevedra (Spain). A total of 45 athletes were classified into three groups according to the Foot Posture Index (FPI-6): pronated, neutral, and supinated feet. Dynamic postural stability was assessed using the Y Balance Test (YBT), normalized to limb length to obtain a composite percentage score for each lower limb. Additional variables included age, sex, training exposure, years practicing judo, dominant (habitual support) foot, and history of neck, spine, hip, or lower limb injuries.
The primary objective is to determine whether dynamic stability differs between foot posture groups. Secondary objectives are to: (1) explore associations between stability and sociodemographic/training variables, (2) examine differences in YBT scores between judokas with and without a history of lower limb or spine injuries, and (3) compare stability between the dominant and non-dominant foot in single-leg techniques. Statistical analyses include descriptive statistics, normality testing, one-way ANOVA with appropriate post-hoc tests for group comparisons, and Student's t-tests for bivariate analyses, with a two-sided significance level of p < 0.05.
The findings are expected to clarify whether specific foot morphologies are associated with reduced dynamic stability in judokas, providing clinically useful information for biomechanical assessment, targeted injury prevention, and performance optimization in this population.
- Conditions
- Postural Balance, Foot Posture, Sports Injuries, Athletic Performance
- Being tested
- Postural and Balance Assessment
- Keywords
- Judo, Foot Posture Index (FPI-6), Dynamic Stability, Postural Balance, Y Balance Test, Lower Limb Biomechanics, Single-Leg Support, Sports Injury Risk, Athletic Performance, Martial Arts
- Medical subject headings
- Athletic Injuries
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Postural and Balance AssessmentOther
Non-invasive assessment of foot posture using the Foot Posture Index (FPI-6) and dynamic balance using the Y Balance Test performed once in each participant.
| Study group | Role | What they receive |
|---|---|---|
| Judo Athletes | Federated judo athletes aged 15 to 40 years from clubs in A Coruña and Pontevedra, Spain. All participants undergo assessment of foot posture using the Foot Posture Index (FPI-6) and dynamic postural stability using the Y Balance Test in a single evaluation session. Receives: Other: Postural and Balance Assessment |
What is being measured
The primary outcome is the main question the study is designed to answer.
Dynamic postural stability score (Y Balance Test) normalized by limb length
Dynamic postural stability will be assessed using the Y Balance Test (YBT). Participants stand on one leg at the center of a Y-shaped grid and reach in three directions (anterior, posteromedial, and posterolateral) with the contralateral leg. Three valid trials will be recorded for each leg after familiarization. For each direction, the mean of the three reach distances (in centimeters) will be calculated and then normalized to limb length (distance from anterior superior iliac spine to distal tibial malleolus) to obtain a percentage score. A composite YBT score will be derived by summing the three normalized reach distances and dividing by three. Higher scores indicate better dynamic postural stability.
Measured: Single assessment at baseline (one testing session)
Secondary outcomes (2)
Difference in dynamic stability between foot posture groups (pronated, neutral, supinated)
Participants will be classified into three groups according to their Foot Posture Index (FPI-6) scores: pronated, neutral, and supinated feet. The primary Y Balance Test (YBT) composite score, expressed as a percentage, will be compared between these three foot posture groups to determine whether foot type is associated with differences in dynamic postural stability. The YBT composite score is a percentage scale (theoretical range from 0 to values >100), where higher scores indicate better dynamic postural stability.
Measured: Single assessment at baseline
Association between dynamic stability and history of lower limb or spine injuries
Participants will report their history of injuries to the neck, spine, hip, or lower limb using a standardized questionnaire. The normalized composite Y Balance Test score will be compared between judokas with and without a history of such injuries to evaluate whether previous injury is associated with differences in dynamic postural stability.
Measured: Single assessment at baseline
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted18 Feb 2026
- Study start1 Mar 2023
- Primary completion23 May 2023
- Study completion26 Jun 2023
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Postural BalanceStudies of the same condition, open and under way.
- 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
- Observational
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Enrolment
- 45 participants (actual)
Sponsor and investigators
- Lead sponsor
- Fundación Universidad Católica de Valencia San Vicente Mártir
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Luis Baraja Vegas, Fundación Universidad Católica de Valencia San Vicente Mártir
- Investigators
- Luis Baraja Vegas, PhD, Principal investigator, Catholic University of Valencia San Vicente Mártir
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07417332
- Sponsor's protocol ID
- UCV/2022-2023/111
- Status last verified
- Feb 2026
- First submitted
- 11 Feb 2026
- Last updated
- 20 Feb 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Parada-Souto JC, Part-Ferrer R, Jaenada-Carrilero E, Sales Castellanos C, Gallego-Estévez R. Determination of the degree of dynamic stability of the foot in single-leg support in relation to the Foot Posture Index in judokas. Manuscript submitted for publication.
Study at a glance
From the registry record, last updated by the sponsor on 20 Feb 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Determination of the Degree of Dynamic Stability of the Foot in Single-leg Support in Relation to the Foot Posture Index in Judokas
- ClinicalTrials.gov ID
- NCT07417332
- Acronym / sponsor ID
- UCV/2022-2023/111
- Conditions
- Postural Balance, Foot Posture, Sports Injuries, Athletic Performance
- Keywords
- Judo, Foot Posture Index (FPI-6), Dynamic Stability, Postural Balance, Y Balance Test, Lower Limb Biomechanics, Single-Leg Support, Sports Injury Risk
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 45 participants (actual)
- Lead sponsor
- Fundación Universidad Católica de Valencia San Vicente MártirUniversity, hospital or other
- Study start
- 1 Mar 2023 (actual)
- Primary completion
- 23 May 2023 (actual)
- Study completion
- 26 Jun 2023 (actual)
- First posted
- 18 Feb 2026 (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.
The goal of this observational study is to examine the relationship between foot type and dynamic stability (balance while standing on one leg) in judo athletes. Judo requires excellent balance to perform techniques effectively and avoid injuries. However, there is limited scientific knowledge about how foot posture affects balance in judokas.
The main questions this study aims to answer are:
- Does foot type (neutral, pronated, or supinated) affect dynamic stability in judokas?
- Are there differences in balance between male and female judokas?
- Does injury history affect dynamic stability?
- Is there a difference in balance between the dominant and non-dominant foot?
Participants in this study will:
- Have their foot type assessed using the Foot Posture Index (FPI-6), a clinical tool that evaluates foot alignment
- Perform the Y Balance Test, which measures how far they can reach in three directions while standing on one leg
- Complete a questionnaire about their training history, injuries, and demographic information
All assessments will be conducted in the participants' judo training facilities (tatami) during a single session.
Researchers will compare three groups of judokas (those with neutral, pronated, and supinated feet) to see if foot type influences balance performance. This information may help coaches and healthcare professionals better assess athletes, prevent injuries, and improve sports performance in judo.
Detailed description
Judo is a combat sport that places high demands on dynamic postural control due to continuous changes in stance, center of mass, and base of support during throws, defenses, and transitions between standing and ground fighting. Alterations in foot posture (neutral, pronated, or supinated) may modify lower limb biomechanics and could influence dynamic stability and injury risk, but this relationship has not been specifically examined in adult judokas.
This cross-sectional observational study was conducted in federated judokas from clubs in the Galician provinces of A Coruña and Pontevedra (Spain). A total of 45 athletes were classified into three groups according to the Foot Posture Index (FPI-6): pronated, neutral, and supinated feet. Dynamic postural stability was assessed using the Y Balance Test (YBT), normalized to limb length to obtain a composite percentage score for each lower limb. Additional variables included age, sex, training exposure, years practicing judo, dominant (habitual support) foot, and history of neck, spine, hip, or lower limb injuries.
The primary objective is to determine whether dynamic stability differs between foot posture groups. Secondary objectives are to: (1) explore associations between stability and sociodemographic/training variables, (2) examine differences in YBT scores between judokas with and without a history of lower limb or spine injuries, and (3) compare stability between the dominant and non-dominant foot in single-leg techniques. Statistical analyses include descriptive statistics, normality testing, one-way ANOVA with appropriate post-hoc tests for group comparisons, and Student's t-tests for bivariate analyses, with a two-sided significance level of p < 0.05.
The findings are expected to clarify whether specific foot morphologies are associated with reduced dynamic stability in judokas, providing clinically useful information for biomechanical assessment, targeted injury prevention, and performance optimization in this population.
Study design
- Observational model
- Cohort
- Time perspective
- Cross-sectional
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Judo Athletes | – | Other: Postural and Balance AssessmentFederated judo athletes aged 15 to 40 years from clubs in A Coruña and Pontevedra, Spain. All participants undergo assessment of foot posture using the Foot Posture Index (FPI-6) and dynamic postural stability using the Y Balance Test in a single evaluation session. |
Who may qualify
- Ages
- 15 to 40 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
- Study population
- Federated judo athletes aged 15 to 40 years from judo clubs in the Galician provinces of A Coruña and Pontevedra (Spain), with at least 3 years of practice and regular weekly training.
Key inclusion criteria (5 listed)
- Federated judo athletes between 15 and 40 years of age.
- Minimum of 3 years practicing judo.
- At least 2 judo training sessions per week.
- Ability to understand and follow study instructions.
- Signed informed consent (and parental consent for minors, if applicable).
Key exclusion criteria (4 listed)
- Presence of any systemic disease that may cause morphological or biomechanical alterations of the lower limbs.
- Current biomechanical limitations of the lower limbs that prevent safe performance of the Y Balance Test.
- History of recent lower limb surgery or spinal surgery that may interfere with balance assessment.
- Refusal to undergo measurements or to have data collected at the time of evaluation.
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 |
|---|---|---|
| Postural and Balance AssessmentNon-invasive assessment of foot posture using the Foot Posture Index (FPI-6) and dynamic balance using the Y Balance Test performed once in each participant. | Other | Judo Athletes |
Primary outcome
Dynamic postural stability score (Y Balance Test) normalized by limb length
Time frame: Single assessment at baseline (one testing session)
Dynamic postural stability will be assessed using the Y Balance Test (YBT). Participants stand on one leg at the center of a Y-shaped grid and reach in three directions (anterior, posteromedial, and posterolateral) with the contralateral leg. Three valid trials will be recorded for each leg after familiarization. For each direction, the mean of the three reach distances (in centimeters) will be calculated and then normalized to limb length (distance from anterior superior iliac spine to distal tibial malleolus) to obtain a percentage score. A composite YBT score will be derived by summing the three normalized reach distances and dividing by three. Higher scores indicate better dynamic postural stability.
2 secondary outcomes
Difference in dynamic stability between foot posture groups (pronated, neutral, supinated)
Time frame: Single assessment at baseline
Association between dynamic stability and history of lower limb or spine injuries
Time frame: Single assessment at baseline
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 20 Feb 2026.
- BackgroundParada-Souto JC, Part-Ferrer R, Jaenada-Carrilero E, Sales Castellanos C, Gallego-Estévez R. Determination of the degree of dynamic stability of the foot in single-leg support in relation to the Foot Posture Index in judokas. Manuscript submitted for publication.
- 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. This study is not recruiting at the moment.
Luis Baraja Vegas, PhD principal investigator
Catholic University of Valencia San Vicente Mártir
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Postural Balance and Foot Posture, run by Fundación Universidad Católica de Valencia San Vicente Mártir at 1 site in Spain.
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 4 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: finished, as of the sponsor's last update on 20 Feb 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Spain. 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Dynamic postural stability score (Y Balance Test) normalized by limb length (time frame: Single assessment at baseline (one testing session)). 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 NCT07417332, which also lists 1 linked publication.
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 20 Feb 2026.