Effect of Reverse Nordic Exercise on Countermovement in Youth Soccer Players

This pilot randomized controlled trial aims to evaluate the preliminary effects and feasibility of a four-week Reverse Nordic Exercise program on countermovement jump performance in youth soccer players during the competitive season. Participants are randomly allocated to either a Reverse Nordic Exercise group, which performs a progressive eccentric quadriceps training program in addition to regular soccer training, or a control group that continues usual training. Countermovement jump performance is assessed before and after the intervention to estimate potential treatment effects and inform the design of a future fully powered randomized controlled trial.

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Key information

Conditions

Strength Training Effects

Age range

16 year–18 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

Universidad Católica San Antonio de Murcia

Murcia, 30107, Spain

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Between 16 and 18 years old
Soccer Players

Exclusion criteria

Pathologies or Musculoskeletal Injuries in the last 6 months
Surgical Interventions in the lower extremities in the last 6 months

Treatment and study plan

Nordic Reverse Protocol

Procedure

The participant begins on their knees, with the trunk upright and fully aligned. At this moment, the soccer player slowly leans back, maintaining the starting position by means of a controlled flexion of the knees. This fall is executed at the lowest speed possible to maximize muscle load in the eccentric phase and reach the point of maximum flexion.

Primary outcomes

Jump Height

Time frame: It was performed 3 days after completing the 4-week reverse Nordic exercise protocol.

Chronojump Boscosystem® contact platform (Barcelona), to measure the vertical jump (CMJ and Abalakov) and the Chronojump Boscosystem® Software version 1.7.1
Flight Time

Time frame: It was performed 3 days after completing the 4-week reverse Nordic exercise protocol.

Chronojump Boscosystem® contact platform (Barcelona), to measure the vertical jump (CMJ and Abalakov) and the Chronojump Boscosystem® Software version 1.7.1

Sponsors and collaborators

Lead sponsor

Universidad de Murcia

Other

Registry information

Official study title

Preliminary Effects of Reverse Nordic Exercise on Countermovement Jump Performance in Youth Soccer Players: A Pilot Randomized Controlled Trial

Important dates

Study start: 2021
Primary completion: 2022
Study completion: 2022
First posted: Jul 27, 2026
Registry last updated: Jul 27, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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Completed