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NCT Number: NCT07621913

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

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.

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This study is active but is not currently recruiting participants.

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Key information

Conditions

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

Age range

12 year–18 year

Sex eligibility

All sexes

Study type

Observational

Primary location

Istanbul Gelisim University

Istanbul, Avcılar, 34310, Turkey (Türkiye)

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Inclusion Criteria:
  • 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.

Exclusion criteria

  • - 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.

Treatment and study plan

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.

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.

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.

Primary outcomes

  1. Measuring the biomechanical properties of muscles with MyotonPro

    Time frame: From enrollment to the end of treatment at 6 weeks

    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.

Secondary outcomes

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

    Time frame: From enrollment to the end of measurements at 6 weeks.

    The measuring tape will be used to measure the swimmers' Right and left legs length (cm).

  2. Measuring the range of motion of the lower extremity using a digital goniometer

    Time frame: From enrollment to the end of 6 weeks.

    Passive range of motion of the lower extremity joints (flexion, extension, adduction, abduction, external rotation, and internal rotation) will be measured using a digital goniometer. Results will be recorded in degrees (°)

Sponsors and collaborators

Lead sponsor

Istanbul Gelisim University

Other

Registry information

Official study title

Comparison of Lower Extremity Muscle Biomechanical Properties, Joint Range of Motion, and Performance Parameters in Monofin and Bi-fin Swimmers

Important dates

Study start
2026
Primary completion
2026
Study completion
2026
First posted
Jun 2, 2026
Registry last updated
Jun 2, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.