Comparison of Lower Extremity Parameters in Monofin and Bi-fin Swimmers.

NCT07621913 | Active Not Recruiting

• 1 other identifier: 27.04.2026-2026/04
• Study Type: observational
• Target: 42
• Locations: 1 country
• Sites: 1

Brief Summary

The purpose of this study is to compare the leg muscle features and joint movements of swimmers who use a single large fin (monofin) versus those who use two fins (bi-fins). Different types of fins change how legs move in the water. This may affect the muscle structure and swimming performance. The researchers want to find out the differences between these two groups of swimmers. During the study, the researchers will do the following: Record the age, height, and weight of healthy swimmers who train regularly. Measure the stiffness and flexibility of the leg muscles using MyotonPro device. Check how well the hips, knees, and ankles can move using digital goniometer. The findings from this study will help create safer training programs for swimmers. Coaches will use the results to improve swimming performance and lower the risk of leg injuries.

Conditions

Lower Extremity Muscles Biomechanical Properties and Joint Range of Motion in Swimmers

Outcome Measures

Primary Outcomes (1)

• Measuring the biomechanical properties of muscles with MyotonPro

  Bilaterally Biomechanical properties (F - Natural Oscillation Frequency \[Hz\], characterizing Tone or Tension, S - Dynamic Stiffness \[N/m\], D - Logarithmic Decrement \[relative unit\], characterizing Elasticity, R - Mechanical Stress Relaxation Time \[ms\], C - Ratio of Relaxation and Deformation time \[relative unit\], characterizing Creep) of the rectus femoris, tibialis anterior, medial gastrocnemius and hamstring muscles were measured using Myoton PRO. Because the MyotonPRO assessment yields a single-session composite outcome by presenting all relevant units concurrently on the screen, these variables were treated as a whole rather than being documented separately.

  From enrollment to the end of treatment at 6 weeks

Secondary Outcomes (2)

• Measuring the length of lower extremity using a tape measure.

  From enrollment to the end of measurements at 6 weeks.

• Measuring the range of motion of the lower extremity using a digital goniometer

  From enrollment to the end of 6 weeks.

Study Arms (2)

Monofin swimmers

Device: Measuring of the biomechanical properties of muscles with MyotonPro; Device: Measurement of the length of the lower extremity with a tape measure.; Device: Measuring the range of motion of the lower extremity joints with a digital goniometer

Bi-fin swimmers

Device: Measuring of the biomechanical properties of muscles with MyotonPro; Device: Measurement of the length of the lower extremity with a tape measure.; Device: Measuring the range of motion of the lower extremity joints with a digital goniometer

Interventions

Measuring of the biomechanical properties of muscles with MyotonPro DEVICE

MyotonPro is used to utilize the biomechanical properties of the muscle. During measurements, the patient will be seated in a chair with back support; the biomechanical properties of the rectus femoris, tibialis anterior, medial gastrocnemius, and hamstring muscles (F - Natural Oscillation Frequency \[Hz\], Tone or Tension ranges, S - Dynamic Stiffness \[N/m\], D - Logarithmic Decrease \[relative unit\], Elasticity increase, R - Mechanical Stress Relaxation Time \[ms\], C - Relaxation and Deformation Time Ratio \[relaxation and deformation time ratio \[N/m\]) will be measured bilaterally using Myoton PRO. All measurements will be tracked according to the mileage.

Bi-fin swimmers; Monofin swimmers

Measurement of the length of the lower extremity with a tape measure. DEVICE

Swimmers' right and left leg lengths (cm) will be measured. All measurements will be tracked in terms of kilometers covered. All measurements will be compared statistically according to pallet types.

Bi-fin swimmers; Monofin swimmers

Measuring the range of motion of the lower extremity joints with a digital goniometer DEVICE

Passive range of motion of the lower extremity shoulder joint (flexion, extension, adduction, abduction, external rotation, and internal rotation) will be measured using a digital goniometer. Results will be recorded in degrees (°). All measurements will be compared statistically according to pallet types.

Bi-fin swimmers; Monofin swimmers

Eligibility Criteria

• Age: 12 Years - 18 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64)
• Sampling Method: Probability Sample

Study Population

Young healthy swimmers

You may qualify if:

• Being between 12-18 years old
• Having been involved in at least one swimming style for at least 3 years
• Having participated in at least one competition
• Obtaining parental consent. Obtaining parental consent.

You may not qualify if:

• \- Having undergone any surgery on the shoulder girdle muscles.
• Having any orthopedic or physical disorder in the shoulder girdle muscles (e.g., frozen shoulder).
• Participating in another sport besides swimming.

Sponsors & Collaborators

• Istanbul Gelisim University: lead

Study Sites (1)

Istanbul Gelisim University

Istanbul, Avcılar, 34310, Turkey (Türkiye)

Location

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: May 20, 2026
• First Posted: June 2, 2026
• Study Start: May 2, 2026
• Primary Completion: June 15, 2026
• Study Completion: June 30, 2026
• Last Updated: June 2, 2026

Record last verified: 2026-05

Data Sharing

• IPD Sharing: Will not share

Locations

TU (1)