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Off-season Training Effects on U19 Soccer Players

Comparison of Functional and Traditional Strength and Power Training on U19 Soccer Players During Off-season in Norway: A Randomized Controlled Trial

Status
Completed
Phases
NA
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05534191
Enrollment
53
Registered
2022-09-09
Start date
2023-09-01
Completion date
2024-01-14
Last updated
2025-09-04

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Soccer Performance

Keywords

Technical skills, Power, Coordination, Speed

Brief summary

The goal of this randomized controlled trial is to evaluate whether functional strength and power training or traditional strength and power training during the off-season can improve soccer-specific performance in trained male U19 Norwegian soccer players. The main questions it aims to answer are: Does functional training lead to greater improvements in technical soccer skills (passing, shooting, dribbling) compared to traditional training? Do both training modalities improve mobility, dynamic balance, sprint speed, change of direction, and jumping performance? Researchers will compare the functional training group, the traditional training group, and a control group to see if either training approach provides superior performance benefits. Participants will: Take part in an 8-week intervention. Complete two weekly strength sessions (functional or traditional depending on allocation). Attend two weekly soccer sessions during the first 4 weeks (all groups). Undergo a standardized test battery measuring mobility, balance, technical skills, sprinting, change of direction, and vertical jump before and after the intervention.

Interventions

To quantify the effect of a strength intervention for footballers on improved range of motion, balance, speed, jump height, and technical football skills compared to a training group performing basic power exercises and machine-based strength training and a control group.

Sponsors

The Research Council of Norway
CollaboratorOTHER
Aalborg University
Lead SponsorOTHER

Study design

Allocation
RANDOMIZED
Intervention model
FACTORIAL
Primary purpose
OTHER
Masking
NONE

Eligibility

Sex/Gender
MALE
Age
16 Years to 20 Years
Healthy volunteers
Yes

Inclusion criteria

Male soccer players aged 16-20 years. Active competitors in the Norwegian G19 0. Division or the Norwegian Tipping League (Senior 3. Division). Minimum of eight years of organized soccer experience. At least two years of structured resistance training experience. No concurrent involvement in other structured physical activity programs.

Exclusion criteria

History of lower-limb injury within the past three months. Inability to meet the required training attendance (≥14 out of 16 sessions). Participation in additional structured training programs outside the intervention.

Design outcomes

Primary

MeasureTime frameDescription
Loughborough soccer passing testDay 1Measure precision in passing (Seconds)
Loughborough soccer shooting testDay 1Measure precision in shooting and reaction (Points and secounds )
Agility with ballDay 1Measure technical abilities with the ball (Seconds)

Secondary

MeasureTime frameDescription
Active dorsi flexion testDay 1Measure range of motion (Degrees)
Dynamic leap balance testDay 1Measure improved dynamic balance (Secounds)
Active knee extension testDay 1Measure range of motion (Degrees)
Vertical jumping testDay 1Measure jumping abilities (Cm)
10 m and 20 m linear sprintDay 1Measure the ability to accelerate and maximum speed (Seconds; Km/h)
S180 sprinting testDay 1Measure change of direction abilities (Secounds)
Hip External rotationDay 1Measure range of motion (Degrees)
Hip Internal rotationDay 1Measure range of motion (Degrees)

Countries

Norway

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026