Integrated Training Program On Jump Performance And Knee Valgus In Youth Football Players

NCT ID: NCT07009041

Last Updated: 2025-06-06

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 90 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-09-15
• Study Completion Date: 2024-11-12

Brief Summary

This study aimed to investigate the effects of stretching, strength, and plyometric exercise training programs, applied in addition to regular training, on jumping performance and knee valgus values in football players.

Detailed Description

The sample of this study consisted of male football players from an under-19 (U-19) team based in Kayseri, Turkey. The inclusion criteria required participants to be male, aged 18 or older, actively competing in the U-19 category, free from any disabilities, and to have at least five years of experience as licensed football players. In 2024, ninety athletes from an amateur football club were invited to participate in the study. Participants were assigned to experimental and control groups using an unbiased sampling method. Groups were balanced based on pre-test results to ensure equivalence.

A true experimental design was employed, specifically the pre-test-post-test control group model. Jump tests, including the countermovement jump (CMJ), free-arm countermovement jump (CMJFREE), drop jump (DJ), squat jump (SJ), and horizontal jump, were conducted using the My Jump 2 application. The knee valgus test was performed using the My Jump Lab application, which enables markerless motion analysis by evaluating images recorded by a mobile device. This application provides valuable insights into injury prevention particularly in the lower extremities and supports the assessment of proper execution of technical movements.

The training program included strength, flexibility, and plyometric exercises, designed to reduce muscle strength imbalances while enhancing flexibility and plyometric performance. Since improvements in motor characteristics and muscle balance are expected to positively affect knee valgus angles, all components of the training program were implemented in combination. Strength training was carried out over eight weeks and included full-body, core, and lower extremity exercises. In addition, the anterior cruciate ligament injury prevention program developed by Hewett et al., which emphasizes plyometric training, was incorporated during the first six weeks in accordance with its prescribed duration. Stretching exercises were performed following strength training sessions throughout the entire eight-week period. The training program was administered exclusively to the experimental group and followed a consistent schedule and sequence. Training sessions were conducted three times per week for eight weeks, separate from routine football practices. Plyometric exercises were included once per week, and a minimum one-day rest interval was maintained between sessions.

Data were analyzed using SPSS version 27. The Kolmogorov-Smirnov test was used to assess the normality of data distribution. Repeated Measures Analysis of Variance (ANOVA) was applied for within-subject comparisons, while the Bonferroni test was used to determine the source of significant differences. Between-group comparisons were conducted using the Independent Samples t-test.

Conditions

Knee Valgus

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: PREVENTION
• Blinding Strategy: NONE

Study Groups

Experimental Group

The group that received 8-week training programs

Group Type: EXPERIMENTAL

Strength training program

Intervention Type: OTHER

Strength training was implemented for eight weeks, including full-body, core, and leg exercises.

Stretching exercises program

Intervention Type: OTHER

Stretching exercises were performed after strength training for the entire eight-week period. The training was administered exclusively to participants in the experimental group, following a consistent schedule and sequence. The program was conducted three days a week for eight weeks, separate from regular football training.

Plyometric exercises program

Intervention Type: OTHER

Plyometric exercises were included only one day per week, and a minimum one-day rest period was maintained between training sessions.Since this program was originally 6 weeks long, it was implemented in the first 6 weeks of the study's implementation process.

Demographic tests

Intervention Type: DIAGNOSTIC_TEST

Demographic tests were applied to determine the height, weight and BMI values for the identification of the participants.

Jump tests

Intervention Type: DIAGNOSTIC_TEST

Jump tests (CMJ, CMJ Free, SJ, DJ, Horizontal Jump). Three different measurements were taken at three different times.(Before starting, end of week 4 and after completion of week 8).

Knee Valgus tests

Intervention Type: DIAGNOSTIC_TEST

It was conducted to determine the right and left knee valgus values of the participants.Three different measurements were taken at three different times. (Before starting, end of week 4 and after completion of week 8).

Control Group

Group without any intervention

Group Type: OTHER

Demographic tests

Intervention Type: DIAGNOSTIC_TEST

Demographic tests were applied to determine the height, weight and BMI values for the identification of the participants.

Jump tests

Intervention Type: DIAGNOSTIC_TEST

Jump tests (CMJ, CMJ Free, SJ, DJ, Horizontal Jump). Three different measurements were taken at three different times.(Before starting, end of week 4 and after completion of week 8).

Knee Valgus tests

Intervention Type: DIAGNOSTIC_TEST

It was conducted to determine the right and left knee valgus values of the participants.Three different measurements were taken at three different times. (Before starting, end of week 4 and after completion of week 8).

Interventions

Strength training program

Strength training was implemented for eight weeks, including full-body, core, and leg exercises.

Intervention Type: OTHER

Stretching exercises program

Stretching exercises were performed after strength training for the entire eight-week period. The training was administered exclusively to participants in the experimental group, following a consistent schedule and sequence. The program was conducted three days a week for eight weeks, separate from regular football training.

Intervention Type: OTHER

Plyometric exercises program

Plyometric exercises were included only one day per week, and a minimum one-day rest period was maintained between training sessions.Since this program was originally 6 weeks long, it was implemented in the first 6 weeks of the study's implementation process.

Intervention Type: OTHER

Demographic tests

Demographic tests were applied to determine the height, weight and BMI values for the identification of the participants.

Intervention Type: DIAGNOSTIC_TEST

Jump tests

Jump tests (CMJ, CMJ Free, SJ, DJ, Horizontal Jump). Three different measurements were taken at three different times.(Before starting, end of week 4 and after completion of week 8).

Intervention Type: DIAGNOSTIC_TEST

Knee Valgus tests

It was conducted to determine the right and left knee valgus values of the participants.Three different measurements were taken at three different times. (Before starting, end of week 4 and after completion of week 8).

Intervention Type: DIAGNOSTIC_TEST

Eligibility Criteria

Inclusion Criteria

• Being a football player playing in the U-19 football team
• Being a male
• Residing in Kayseri
• Be between 18-19 years old

Exclusion Criteria

• Not being a football player playing on the U-19 football team
• Being a female
• Residence outside Kayseri
• Being outside the 18-19 age range

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 19 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: Yes

Sponsors

TC Erciyes University

OTHER

Sponsor Role: lead

Responsible Party

Vesile Şahiner Güler

Principal Investigator

Responsibility Role: PRINCIPAL_INVESTIGATOR

Locations

Erciyes University

Talas, None Selected, Turkey (Türkiye)

Countries

Turkey (Türkiye)

Other Identifiers

ERU-SAGENS-VSG-01

Identifier Type: -

Identifier Source: org_study_id