Effect of Reverse Nordic Exercise on Countermovement in Youth Soccer Players

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

Status

Completed

Phases

Unknown

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT07729085

Enrollment

Registered

2026-07-27

Start date

2021-10-01

Completion date

2022-04-04

Last updated

2026-07-27

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

Conditions

Strength Training Effects

Keywords

Reverse Nordic Exercise, Countermovement jump, eccentric training, Soccer

Brief summary

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.

Interventions

PROCEDURENordic Reverse Protocol

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.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

BASIC_SCIENCE

Masking

SINGLE (Outcomes Assessor)

Eligibility

Sex/Gender

MALE

Age

16 Years to 18 Years

Healthy volunteers

Yes

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

Design outcomes

Primary

Measure	Time frame	Description
Jump Height	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	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

Countries

Spain

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Jul 28, 2026