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Acute Effects of Isometric Conditioning on Sprint, Jump and Change of Direction Performance in Youth Soccer Players

NCT07482254 · Status: ENROLLING_BY_INVITATION · Phase: NA · Type: INTERVENTIONAL · Enrollment: 12

Last updated 2026-03-19

No results posted yet for this study

Summary

This study aims to examine the acute effects of an isometric conditioning activity on sprinting, jumping, and change-of-direction performance in elite youth soccer players. Twelve male soccer players aged 15-19 years from a professional academy will participate in a randomized crossover study. Each participant will complete two experimental sessions separated by one week.

During each session, participants will perform a standardized warm-up followed by baseline performance tests including countermovement jumps, drop jumps, a 30-m sprint test, and a 505 change-of-direction test. After baseline testing, participants will complete one of two conditions in randomized order: (1) an isometric conditioning activity consisting of unilateral standing isometric calf raises, or (2) a control condition consisting of low-intensity treadmill walking. Performance tests will be repeated seven minutes after the intervention to assess acute changes in neuromuscular performance.

Jump performance will be assessed using a dual force plate system sampling at 1000 Hz, and sprint performance will be measured using electronic timing gates. The study will be conducted on an indoor athletics runway located in a gymnasium. The results will help determine whether isometric conditioning activities can acutely enhance explosive performance in youth soccer players.

Conditions

  • Athletic Performance
  • Soccer
  • Isometric Strength Training

Interventions

BEHAVIORAL

Isometric Conditioning Activity

Participants perform unilateral standing isometric calf raises consisting of 3 sets of 3 repetitions with a 3-second contraction for each repetition. A 3-minute rest period is provided between sets.

BEHAVIORAL

Control Condition

Participants perform low-intensity treadmill walking at a speed of 6 km·h-¹ for 9 minutes.

Sponsors & Collaborators

  • The Jerzy Kukuczka Academy of Physical Education in Katowice

    lead OTHER

Principal Investigators

  • Jonatan Helbin, MSc · Academy of Physical Education in Katowice

Study Design

Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
NONE
Model
CROSSOVER

Eligibility

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

Timeline & Regulatory

Start
2026-03-10
Primary Completion
2026-03-17
Completion
2026-03-17

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 NCT07482254 on ClinicalTrials.gov