Comparison of Hip Adductor Training Using an Isokinetic Device Versus the Copenhagen Adduction Exercise

NCT07822568 | Completed

• 1 other identifier: HipAdd_Intervention
• Study Type: interventional
• Target: 55
• Locations: 1 country
• Sites: 1

Brief 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 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

Outcome Measures

Primary Outcomes (3)

• 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

  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

  Baseline and during Week 9, following completion of the 8-week intervention

• Adductor longus muscle thickness

  Adductor longus muscle thickness measured using ultrasound imaging.

  Baseline and during Week 9, following completion of the 8-week intervention

Secondary Outcomes (8)

• Angle at peak torque during eccentric contraction

  Baseline and during Week 9, following completion of the 8-week intervention

• Concentric adductor peak torque

  Baseline and during Week 9, following completion of the 8-week intervention

• Concentric abductor peak torque

  Baseline and during Week 9, following completion of the 8-week intervention

• Hip Adduction:abduction strength ratio

  Baseline and during Week 9, following completion of the 8-week intervention

• Lateral shuffle test

  Baseline and during Week 9, following completion of the 8-week intervention

Study Arms (3)

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.

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.

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.

Interventions

Isokinetic device-based hip adductor training OTHER

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.

Isokinetic device-based training

Copenhagen adduction exercise training OTHER

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.

Copenhagen adduction exercise training

Eligibility Criteria

• Age: 18 Years+
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• 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.

You may not qualify if:

• 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

Sponsors & Collaborators

• University of Primorska: lead

Study Sites (1)

Fakulteta za vede o zdravju

Izola, 6310, Slovenia

Location

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: BASIC SCIENCE
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Porf. Dr.

Study Record Dates

• First Submitted: September 10, 2026
• First Posted: September 16, 2026
• Study Start: September 30, 2024
• Primary Completion: May 19, 2026
• Study Completion: May 19, 2026
• Last Updated: September 21, 2026

Record last verified: 2026-09

Data Sharing

• IPD Sharing: Will share

Locations

SL (1)