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NCT Number: NCT06992375

Shoulder Manipulation in Volleyball Players

Currently, it is difficult to find studies in the literature assessing the influence of manual therapy on kinetic and kinematic factors for the upper limbs of volleyball players, which in the long run may translate into a reduction in injuries by improving strength and balance in athletes, when planning training or therapy.

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Key information

Conditions

Manual Therapy Manipulation Muscle Strength Muscles Musculoskeletal System

Age range

18 year–30 year

Sex eligibility

Male

Study type

Interventional

Phase

Not applicable

Primary location

AZS Central Academic Sports Center in Gdańsk

Gdansk, 80-210, Poland

Location status: Recruiting

Location contact

Rafał Studnicki, PhD

CONTACT

[email protected]

583491509

Who can participate

Healthy volunteers accepted: Yes

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

Inclusion criteria

  • healthy individuals who are over 18 years old,
  • a player from the AZS volleyball league,
  • a player who regularly competes in the league,
  • expressing informed consent to participate in the study and undertaking to comply with the track regulations and wear a helmet.

Exclusion criteria

  • lack of volunteer consent,
  • previous surgeries of the upper, lower limb and spine,
  • other upper limb injuries in the last 6 months,
  • pain limiting participation in the study,

Treatment and study plan

Manual therapy

Other

This technique involves a low-amplitude, high-velocity push on the shoulder joints with an additional two-second tension

Placebo

Other

This technique involves a low-amplitude, high-velocity push on the shoulder joints with an additional two-second tension

Exercise

Other

The following exercise will be performed:push-ups

Primary outcomes

  1. Assessment of MVC.

    Time frame: The study will be conducted 3 times: pre-intervention, immediately after the intervention and immediately after training session. Each isometric muscle test lasts 3 seconds.

    Muscle EMG is an assessment of electrical characteristics during the test, the electrical source of which is the muscle membrane potential, and measured in μV.

  2. Assessment of MVC.

    Time frame: The study will be conducted 3 times: pre-intervention, immediately after the intervention and immediately after training session.Each isometric muscle test lasts 3 seconds.

    Muscle EMG is an assessment of electrical characteristics during the test, which is measured by the repetition frequency of muscle motor unit discharges, which is measured in Hz, at the same time of the test.Time

  3. Muscle stiffness

    Time frame: The study will be conducted 3 times: pre-intervention, immediately after the intervention and immediately after training session. Each Myoton application lasts 1 sec for one point.

    Muscle stiffness - characteristic resistance to physical contraction, which deforms initially forming. Stiffness (N/m) was calculated as S = amax.mprobe/Δl.

Secondary outcomes

  1. Assessment of proprioception.

    Time frame: The test will be performed 3 times: pre-intervention, immediately after the intervention and immediately after training session. Each joint measurement will be performed at three settings: 30, 45 and 90 degrees.

    Assessing proprioception is an assessment of the angular position of a joint and then an attempt to reproduce it, measured in degrees.

  2. Y balance test

    Time frame: The test will be conducted 3 times: pre-intervention, immediately after the intervention and immediately after training session.

    Consists of the volunteer standing on one leg while simultaneously stretching the other lower limb in 3 different directions. These are: anterior, posteromedial and posterolateral.

  3. Med Ball Throw

    Time frame: The test will be conducted 3 times: pre-intervention, immediately after the intervention and immediately after training session.

    It involves the volunteer sitting on the floor with their legs apart and having to throw a 2 kg ball forward in front of them.

  4. Close Kinetic Chain Upper Extremity Stability Test

    Time frame: The test will be administered 3 times: pre-intervention, immediately after the intervention and immediately after training session.

    The volunteer assumes a push-up position with their hands 36 inches apart, and their performance is assessed based on how many times in 15 seconds the person can lift one arm and move it across the position they are holding their hand in, and touch the other hand with it.

Study contacts

Contact information is provided by the study sponsor or research team.

Rafał Studnicki, PhD

CONTACT

[email protected]

583491509

Sponsors and collaborators

Lead sponsor

Medical University of Gdansk

Other

Registry information

Official study title

Assessment of the Impact of Shoulder Manipulation on Muscle Strength and Stiffness and Motor Functionality of Volleyball Players During Training

Acronym: Manual Therapy

Important dates

Study start
2025
Primary completion
2025
Study completion
2025
First posted
May 28, 2025
Registry last updated
May 28, 2025

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.

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