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Unilateral vs Bilateral Isometric Training in Youth Soccer Players

NCT07556315 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 41

Last updated 2026-04-29

No results posted yet for this study

Summary

This randomized controlled trial investigates the effects of unilateral and bilateral isometric strength training integrated into an 8-week complex training program on neuromuscular performance in elite youth soccer players. Forty-one male players competing at the national level will be randomly assigned to one of three groups: unilateral isometric training (UNI), bilateral isometric training (BI), or a control group performing the same training program without additional isometric exercises.

All participants will complete a structured complex strength training program once per week for eight weeks during the competitive season. Neuromuscular performance will be assessed before and after the intervention using countermovement jump height, broad jump distance, maximal isometric squat peak force and 30-m sprint time. The aim of the study is to determine whether the mode of isometric training (unilateral vs bilateral) influences adaptations in strength, power and sprint performance in youth soccer players.

An additional objective of the study is to determine whether the type of isometric training intervention influences inter-limb asymmetries in neuromuscular performance. Selected tests will therefore be performed both bilaterally and unilaterally to assess potential differences between dominant and non-dominant limbs.

Conditions

  • Athletic Performance
  • Soccer
  • Resistance Training

Interventions

BEHAVIORAL

Unilateral Isometric Training

Isometric strength exercises performed unilaterally including plantar flexion, squat, and hip extension against an immovable barbell.

BEHAVIORAL

Bilateral Isometric Training

Isometric strength exercises performed bilaterally including plantar flexion, squat, and hip extension against an immovable barbell.

BEHAVIORAL

Complex Strength Training

A structured complex training program consisting of paired resistance and ballistic exercises performed once per week for eight weeks.

Sponsors & Collaborators

  • The Jerzy Kukuczka Academy of Physical Education in Katowice

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
14 Years
Max Age
19 Years
Sex
MALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2025-09-30
Primary Completion
2025-12-11
Completion
2025-12-11

Countries

  • Poland

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07556315 on ClinicalTrials.gov