Effect of Foot Core Exercises on Jump Performance in Professional Volleyball Players (FCJUMP)

Effect of Foot Core Exercises on Jump Performance in Professional Volleyball Players: An Objective Evaluation Using ForceDecks

Brief Summary

The purpose of this study is to investigate the effect of foot core exercises on jump performance in professional volleyball players. Participants will be randomly assigned to two groups. The first group will perform a strength training program only, while the second group will perform foot core exercises in addition to the same strength training program. Jump performance will be assessed using the Countermovement Jump (CMJ) test, and performance scores will be obtained through force-time analysis using the ForceDecks system. The findings of this study are expected to contribute to the development of training programs aimed at improving performance and reducing injury risk in professional volleyball players.

Study Overview

• Status: Not yet recruiting
• Conditions: Athletic Performance
• Intervention / Treatment: Behavioral: Strength Training Program; Behavioral: Foot Core Exercise Program

Detailed Description

Detailed Description

This study is designed to examine the effects of foot core exercises on jump performance in professional volleyball players. Participants will be divided into two groups: a control group and an intervention group. The control group will follow a standardized strength training program, while the intervention group will perform the same strength training program combined with additional foot core exercises.

Jump performance will be evaluated using the Countermovement Jump (CMJ) test. Kinetic variables derived from force-time data will be collected using the ForceDecks system. Pre- and post-intervention measurements will be compared to determine the effects of the training programs.

The results of this study are expected to provide evidence-based information for designing training programs that enhance athletic performance and help reduce injury risk in professional volleyball players.

• Study Type: Interventional
• Enrollment (Estimated): 43
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Önder Çalışkan, MSc Candidate; Phone Number: +905379125304; Email: fztondercaliskan@outlook.com

Study Locations

• Turkey (Türkiye)
  • Mudanya
    • Bursa, Mudanya, Turkey (Türkiye)
      • Mudanya University
      • Contact: Hazal B Yılmaz, PhD; Phone Number: +90 553 444 59 25; Email: hazalberfin.yilmaz@mudanya.edu.tr

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Male professional volleyball players aged 18 to 35 years
• Actively licensed athletes competing in clubs affiliated with the Turkish Volleyball Federation
• Regular participation in team training sessions without interruption for at least the past 3 months
• No history of surgery or serious injury involving the lower extremities (foot, ankle, knee, or hip) within the last 6 months
• Agreement not to participate in any additional strength, balance, or proprioception-based exercise programs during the study period
• No medical or physiological condition that would prevent participation in the Countermovement Jump (CMJ) test performed using the ForceDecks system
• Voluntary participation with written informed consent obtained prior to enrollment

Exclusion Criteria:

• Presence of deformity, chronic pain, or functional impairment in the foot or ankle
• History of lower extremity orthopedic surgery within the past 6 months
• History of neurological or vestibular disorders, or systemic diseases affecting balance
• Participation in physiotherapy interventions, rehabilitation protocols, or exercise programs outside the scope of the study during the study period

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Strength Training Group; Description Participants in this group will perform a standardized lower-extremity strength training program routinely used for professional volleyball players.	Behavioral: Strength Training Program; Description Participants will perform a standardized lower-extremity strength training program routinely used for professional volleyball players. Arms Assigned; Strength Training Group; Strength Training Plus Foot Core Exercises Group
Experimental: Strength Training plus Foot Core Exercise Group; Experimental: Strength Training Plus Foot Core Exercises Group Description Participants in this group will perform the same standardized lower-extremity strength training program in addition to a foot core exercise program targeting intrinsic and extrinsic foot muscles.	Behavioral: Strength Training Program; Description Participants will perform a standardized lower-extremity strength training program routinely used for professional volleyball players. Arms Assigned; Strength Training Group; Strength Training Plus Foot Core Exercises Group; Behavioral: Foot Core Exercise Program; Description Participants will perform foot core exercises targeting intrinsic and extrinsic foot muscles. The exercises are designed to improve foot stability and functional control. Arms Assigned ✔️ Strength Training Plus Foot Core Exercises Group ❌ Strength Training Group (işaretleme)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Vertical Jump Height (Countermovement Jump)	Maximum vertical jump height measured during the Countermovement Jump (CMJ) test.	Baseline and post-intervention (approximately 8 weeks)

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Force-Time Variables During Countermovement Jump	Force-time variables obtained from force platform measurements during the Countermovement Jump (CMJ) test.	Baseline and post-intervention (approximately 8 weeks)

Collaborators and Investigators

• Sponsor: Mudanya University
• Investigators: Principal Investigator: Hazal B Yılmaz, PhD, Mudanya University

Study record dates

Study Major Dates

• Study Start (Estimated): March 1, 2026
• Primary Completion (Estimated): March 1, 2027
• Study Completion (Estimated): June 1, 2027

Study Registration Dates

• First Submitted: January 3, 2026
• First Submitted That Met QC Criteria: February 5, 2026
• First Posted (Actual): February 12, 2026

Study Record Updates

• Last Update Posted (Actual): February 12, 2026
• Last Update Submitted That Met QC Criteria: February 5, 2026
• Last Verified: February 1, 2026

More Information

Terms related to this study

• Keywords: Athletic Performance; Countermovement Jump; Jump Performance; Volleyball Players; Foot Core Exercise; Force Plates
• Other Study ID Numbers: 2025/222

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: Individual participant data will not be shared, as this study is conducted as part of a master's thesis with a limited sample size, and data sharing is not covered by the informed consent approved by the ethics committee.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No