Strength Training EffectsNCT07729085
Effect of Reverse Nordic Exercise on Countermovement in Youth Soccer Players
A study testing Nordic Reverse Protocol in people with Strength Training Effects, run by Universidad de Murcia at 1 site in Spain.
Trial 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. Read more about this study
- Who is it for?
- Ages 16 to 18 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Strength Training Effects
- What is being tested?
- Nordic Reverse Protocol
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 18 participants
- Where
- 1 siteSpain
- Study dates
- 1 Oct 2021to 4 Apr 2022
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 16 to 18 years
- Men only
- Healthy volunteers accepted
- Child, Adult
Who may be able to join
- Between 16 and 18 years old
- Soccer Players
Who cannot join
- Pathologies or Musculoskeletal Injuries in the last 6 months
- Surgical Interventions in the lower extremities in the last 6 months
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Preliminary Effects of Reverse Nordic Exercise on Countermovement Jump Performance in Youth Soccer Players: A Pilot Randomized Controlled Trial
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.
- Conditions
- Strength Training Effects
- Being tested
- Nordic Reverse Protocol
- Keywords
- Reverse Nordic Exercise, Countermovement jump, eccentric training, Soccer
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Nordic Reverse ProtocolProcedure or surgery
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 group | Role | What they receive |
|---|---|---|
| Experimental: Nordic Reverse Protocol | Experimental | The intervention group performed the reverse Nordic exercise or quadriceps drop protocol for four weeks in their training sessions. Participants assigned to the intervention group warm up for approximately 15/20 minutes, consisting of five minutes of continuous running at low speed (approximately 10 km/h), followed by 3 minutes of stretching the lower extremities and three separate progressive sprints.
between them with two minutes of rest to finish, then they will carry out the corresponding series and repetitions of the protocol and continue with their usual training. Receives: Procedure: Nordic Reverse Protocol |
| No Intervention : Usual Training Sessions | No intervention | The control group did not have any intervention, the participants randomly assigned to this group continued with their usual training sessions. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Jump Height
Chronojump Boscosystem® contact platform (Barcelona), to measure the vertical jump (CMJ and Abalakov) and the Chronojump Boscosystem® Software version 1.7.1
Measured: It was performed 3 days after completing the 4-week reverse Nordic exercise protocol.
Flight Time
Chronojump Boscosystem® contact platform (Barcelona), to measure the vertical jump (CMJ and Abalakov) and the Chronojump Boscosystem® Software version 1.7.1
Measured: It was performed 3 days after completing the 4-week reverse Nordic exercise protocol.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted27 Jul 2026
- Study start1 Oct 2021
- Primary completion4 Mar 2022
- Study completion4 Apr 2022
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Strength Training EffectsStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 18 participants (actual)
Sponsor and investigators
- Lead sponsor
- Universidad de Murcia
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Javier Reina Abellan; PhD, Universidad de Murcia
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07729085
- Sponsor's protocol ID
- CE012205
- Status last verified
- Jul 2026
- First submitted
- 19 Jul 2026
- Last updated
- 27 Jul 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Study at a glance
From the registry record, last updated by the sponsor on 27 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Preliminary Effects of Reverse Nordic Exercise on Countermovement Jump Performance in Youth Soccer Players: A Pilot Randomized Controlled Trial
- ClinicalTrials.gov ID
- NCT07729085
- Acronym / sponsor ID
- CE012205
- Conditions
- Strength Training Effects
- Keywords
- Reverse Nordic Exercise, Countermovement jump, eccentric training, Soccer
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 18 participants (actual)
- Lead sponsor
- Universidad de MurciaUniversity, hospital or other
- Study start
- 1 Oct 2021 (actual)
- Primary completion
- 4 Mar 2022 (actual)
- Study completion
- 4 Apr 2022 (actual)
- First posted
- 27 Jul 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Experimental: Nordic Reverse Protocol | Experimental | Procedure: Nordic Reverse ProtocolThe intervention group performed the reverse Nordic exercise or quadriceps drop protocol for four weeks in their training sessions. Participants assigned to the intervention group warm up for approximately 15/20 minutes, consisting of five minutes of continuous running at low speed (approximately 10 km/h), followed by 3 minutes of stretching the lower extremities and three separate progressive sprints. between them with two minutes of rest to finish, then they will carry out the corresponding series and repetitions of the protocol and continue with their usual training. |
| No Intervention : Usual Training Sessions | No intervention | –The control group did not have any intervention, the participants randomly assigned to this group continued with their usual training sessions. |
Who may qualify
- Ages
- 16 to 18 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Child, Adult
Key inclusion criteria (2 listed)
- Between 16 and 18 years old
- Soccer Players
Key exclusion criteria (2 listed)
- Pathologies or Musculoskeletal Injuries in the last 6 months
- Surgical Interventions in the lower extremities in the last 6 months
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Nordic Reverse ProtocolThe 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. | Procedure or surgery | Experimental: Nordic Reverse Protocol |
Primary outcome
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
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 27 Jul 2026.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Nordic Reverse Protocol in people with Strength Training Effects, run by Universidad de Murcia at 1 site in Spain.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 2 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 27 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Spain. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Jump Height (time frame: It was performed 3 days after completing the 4-week reverse Nordic exercise protocol.). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 27 Jul 2026.