Determination of the Degree of Dynamic Stability of the Foot in Single-leg Support in Relation to the Foot Posture Index in Judokas

NCT07417332 | Completed

• 1 other identifier: UCV/2022-2023/111
• Study Type: observational
• Target: 45
• Locations: 1 country
• Sites: 1

Brief 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. 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.

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; Athletic Performance; Martial Arts

Outcome Measures

Primary Outcomes (1)

• 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.

  Single assessment at baseline (one testing session)

Secondary Outcomes (2)

• Difference in dynamic stability between foot posture groups (pronated, neutral, supinated)

  Single assessment at baseline

• Association between dynamic stability and history of lower limb or spine injuries

  Single assessment at baseline

Study Arms (1)

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.

Other: Postural and Balance Assessment

Interventions

Postural and Balance Assessment OTHER

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.

Judo Athletes

Eligibility Criteria

• Age: 15 Years - 40 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64)
• Sampling Method: Non-Probability Sample

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.

You may qualify if:

• 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).

You may not qualify if:

• 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.

Sponsors & Collaborators

• Fundación Universidad Católica de Valencia San Vicente Mártir: lead

Study Sites (1)

Catholic University of Valencia San Vicente Mártir

Valencia, Valencia, 46001, Spain

Location

Related Publications (1)

• 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.

  BACKGROUND

MeSH Terms

Conditions

Athletic Injuries

Condition Hierarchy (Ancestors)

Wounds and Injuries

Study Officials

• Luis Baraja Vegas, PhD

  Catholic University of Valencia San Vicente Mártir

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Professor, PhD

Study Record Dates

• First Submitted: February 11, 2026
• First Posted: February 18, 2026
• Study Start: March 1, 2023
• Primary Completion: May 23, 2023
• Study Completion: June 26, 2023
• Last Updated: February 20, 2026

Record last verified: 2026-02

Data Sharing

• IPD Sharing: Will not share

Locations

ES (1)