Healthy Active MalesNCT07822568
Comparison of Hip Adductor Training Using an Isokinetic Device Versus the Copenhagen Adduction Exercise
A study testing Isokinetic device-based hip adductor training and Copenhagen adduction exercise training in people with Healthy Active Males, run by University of Primorska at 1 site in Slovenia.
Trial summary
This randomized controlled trial compared two exercise approaches for strengthening the hip adductor muscles in healthy, recreationally active adults. Participants were assigned to one of three groups: training using a custom isokinetic device, training using the Copenhagen adduction exercise, or a control group that… Read more about this study
- Who is it for?
- Ages 18 years and older, men onlyHealthy volunteers can take part
- Conditions the study is for
- Healthy Active Males
- What is being tested?
- Isokinetic device-based hip adductor training and Copenhagen adduction exercise training
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 55 participants
- Where
- 1 siteSlovenia
- Study dates
- 30 Sep 2024to 19 May 2026
- 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 18 years and older
- Men only
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Healthy and free from musculoskeletal injury at the time of enrollment;
- Recreationally active males;
- Able to successfully complete 5 repetitions of the Copenhagen adduction exercise.
Who cannot join
- Serious injury to nervous, muscular, skeletal, or connective tissue involving the back, hip, or lower extremities within the previous 12 months
- Inability to perform the Copenhagen adduction exercise
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Comparison of Hip Adductor Training Using an Isokinetic Device Versus the Copenhagen Adduction Exercise: A Randomized Controlled Trial
This randomized controlled trial compared two exercise approaches for strengthening the hip adductor muscles in healthy, recreationally active adults. Participants were assigned to one of three groups: training using a custom isokinetic device, training using the Copenhagen adduction exercise, or a control group that did not perform the specific hip adductor training. The intervention lasted 8 weeks. The device-based program used controlled eccentric muscle actions, in which the hip adductors produce force while being lengthened, whereas the Copenhagen adduction exercise involved a commonly used body-weight strengthening exercise.
The purpose of the study was to determine how these two types of hip adductor training affect muscle strength and other physical characteristics that may be relevant to performance and the prevention of groin and hip adductor injuries. The main research question was whether training with the isokinetic device produces different and potentially greater adaptations than the Copenhagen adduction exercise and no specific training. The study hypothesis was that device-based eccentric training would lead to greater improvements in hip adductor strength and related functional and muscle characteristics than copenhagen adduction exercise training, while the control group would show little or no change.
- Conditions
- Healthy Active Males
- Being tested
- Isokinetic device-based hip adductor training, Copenhagen adduction exercise training
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Isokinetic device-based hip adductor trainingOther
An 8-week, twice-weekly hip adductor training program performed using an isokinetic device. The exercise involved controlled eccentric contractions of the hip adductors. The device moved the lower limbs into hip abduction at a controlled angular velocity while participants resisted the movement with the hip adductor muscles. Training volume was progressively increased over the intervention.
Copenhagen adduction exercise trainingOther
An 8-week, twice-weekly hip adductor strengthening program using the Copenhagen adduction exercise. Participants performed the exercise with an emphasis on the eccentric phase, and training volume was progressively increased.
| Study group | Role | What they receive |
|---|---|---|
| Isokinetic device-based training | Experimental | Participants completed an 8-week hip adductor training program using an isokinetic device. Training consisted of controlled eccentric hip adduction exercise, in which the hip adductor muscles produced force while being lengthened. Training was performed twice per week with progressive training volume. Receives: Other: Isokinetic device-based hip adductor training |
| Copenhagen adduction exercise training | Experimental | Participants completed an 8-week hip adductor strengthening program using the Copenhagen adduction exercise. Training was performed twice per week, with the number of sets and repetitions progressively increased during the intervention. Receives: Other: Copenhagen adduction exercise training |
| Control | No intervention | Participants did not perform either of the study-specific hip adductor training programs during the 8-week intervention period. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Eccentric adductor peak torque
Eccentric hip adductor peak torque of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Eccentric work
Work during eccentric hip adductor contraction of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Adductor longus muscle thickness
Adductor longus muscle thickness measured using ultrasound imaging.
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Secondary outcomes (8)
Angle at peak torque during eccentric contraction
Angle at peak torque during eccentric contraction of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Concentric adductor peak torque
Concentric hip adductor peak torque of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s and 90°/s
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Concentric abductor peak torque
Concentric hip abductor peak torque of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s and 90°/s
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Hip Adduction:abduction strength ratio
Ratio of concentric hip adduction to abduction peak torque.
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Lateral shuffle test
Time to complete the lateral shuffle test using photocells.
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Passive hip abduction range of motion
Passive hip abduction range of motion measured using a goniometer, expressed in degrees.
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Adductor longus muscle stiffness
Adductor longus muscle stiffness assessed using ultrasound-based elastography and expressed in kPa.
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Passive resistance to hip abduction
Passive resistance to hip abduction assessed using an isokinetic dynamometer; stiffness derived from the torque-angle relationship.
Measured: Baseline and during Week 9, following completion of the 8-week intervention
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted16 Sep 2026
- Study start30 Sep 2024
- Primary completion19 May 2026
- Study completion19 May 2026
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Healthy Active MalesStudies 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
- None (open label)
- Enrolment
- 55 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Primorska
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Nejc Sarabon, University of Primorska
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07822568
- Sponsor's protocol ID
- HipAdd_Intervention
- Status last verified
- Sep 2026
- First submitted
- 10 Sep 2026
- Last updated
- 21 Sep 2026
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Yes
Study at a glance
From the registry record, last updated by the sponsor on 21 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Comparison of Hip Adductor Training Using an Isokinetic Device Versus the Copenhagen Adduction Exercise: A Randomized Controlled Trial
- ClinicalTrials.gov ID
- NCT07822568
- Acronym / sponsor ID
- HipAdd_Intervention
- Conditions
- Healthy Active Males
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 55 participants (actual)
- Lead sponsor
- University of PrimorskaUniversity, hospital or other
- Study start
- 30 Sep 2024 (actual)
- Primary completion
- 19 May 2026 (actual)
- Study completion
- 19 May 2026 (actual)
- First posted
- 16 Sep 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 randomized controlled trial compared two exercise approaches for strengthening the hip adductor muscles in healthy, recreationally active adults. Participants were assigned to one of three groups: training using a custom isokinetic device, training using the Copenhagen adduction exercise, or a control group that did not perform the specific hip adductor training. The intervention lasted 8 weeks. The device-based program used controlled eccentric muscle actions, in which the hip adductors produce force while being lengthened, whereas the Copenhagen adduction exercise involved a commonly used body-weight strengthening exercise.
The purpose of the study was to determine how these two types of hip adductor training affect muscle strength and other physical characteristics that may be relevant to performance and the prevention of groin and hip adductor injuries. The main research question was whether training with the isokinetic device produces different and potentially greater adaptations than the Copenhagen adduction exercise and no specific training. The study hypothesis was that device-based eccentric training would lead to greater improvements in hip adductor strength and related functional and muscle characteristics than copenhagen adduction exercise training, while the control group would show little or no change.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Isokinetic device-based training | Experimental | Other: Isokinetic device-based hip adductor trainingParticipants completed an 8-week hip adductor training program using an isokinetic device. Training consisted of controlled eccentric hip adduction exercise, in which the hip adductor muscles produced force while being lengthened. Training was performed twice per week with progressive training volume. |
| Copenhagen adduction exercise training | Experimental | Other: Copenhagen adduction exercise trainingParticipants completed an 8-week hip adductor strengthening program using the Copenhagen adduction exercise. Training was performed twice per week, with the number of sets and repetitions progressively increased during the intervention. |
| Control | No intervention | –Participants did not perform either of the study-specific hip adductor training programs during the 8-week intervention period. |
Who may qualify
- Ages
- 18 years and older
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (3 listed)
- Healthy and free from musculoskeletal injury at the time of enrollment;
- Recreationally active males;
- Able to successfully complete 5 repetitions of the Copenhagen adduction exercise.
Key exclusion criteria (2 listed)
- Serious injury to nervous, muscular, skeletal, or connective tissue involving the back, hip, or lower extremities within the previous 12 months
- Inability to perform the Copenhagen adduction exercise
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 |
|---|---|---|
| Isokinetic device-based hip adductor trainingAn 8-week, twice-weekly hip adductor training program performed using an isokinetic device. The exercise involved controlled eccentric contractions of the hip adductors. The device moved the lower limbs into hip abduction at a controlled angular velocity while participants resisted the movement with the hip adductor muscles. Training volume was progressively increased over the intervention. | Other | Isokinetic device-based training |
| Copenhagen adduction exercise trainingAn 8-week, twice-weekly hip adductor strengthening program using the Copenhagen adduction exercise. Participants performed the exercise with an emphasis on the eccentric phase, and training volume was progressively increased. | Other | Copenhagen adduction exercise training |
Primary outcome
Eccentric adductor peak torque
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Eccentric hip adductor peak torque of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s
Eccentric work
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Work during eccentric hip adductor contraction of the dominant leg measured using an isokinetic dynamometer (Humac Norm) at an angular velocity of 30°/s
Adductor longus muscle thickness
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Adductor longus muscle thickness measured using ultrasound imaging.
8 secondary outcomes
Angle at peak torque during eccentric contraction
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Concentric adductor peak torque
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Concentric abductor peak torque
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Hip Adduction:abduction strength ratio
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Lateral shuffle test
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Passive hip abduction range of motion
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Adductor longus muscle stiffness
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
Passive resistance to hip abduction
Time frame: Baseline and during Week 9, following completion of the 8-week intervention
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 21 Sep 2026.
- Individual participant dataSharing planned: Yes
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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 Isokinetic device-based hip adductor training and Copenhagen adduction exercise training in people with Healthy Active Males, run by University of Primorska at 1 site in Slovenia.
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 3 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 21 Sep 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 Slovenia. 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?
Eccentric adductor peak torque (time frame: Baseline and during Week 9, following completion of the 8-week intervention). The study lists 3 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 21 Sep 2026.