Diaphragm Facilitation to See If It Boosts Arm and Shoulder Performance in Volleyball Players
Official title: Immediate Effects of Diaphragmatic Facilitation on Upper Extremity Performance in Volleyball Players
Run by Istinye University · NCT07784517 · Data updated 2026-11-12
This test checks whether a brief manual diaphragmatic facilitation session can improve breathing and upper-extremity performance in active volleyball players.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years to 30 Years |
| Sex | All |
| Enrollment | 50 (estimated) |
| Sponsor | Istinye University Academic / other |
| Locations | 1 site (Istanbul) |
| Status | Recruiting |
| Started | August 30, 2026 |
| Main results expected | November 15, 2026 |
| Study ends | November 30, 2026 |
| Registry record updated | October 1, 2026 |
| Trial ID | NCT07784517 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Active volleyball players aged 18–30 who train regularly and have no recent major upper-extremity or trunk injuries or diagnosed respiratory disease.
✕Probably not a fit
Individuals with recent surgeries, current active injuries, or chronic respiratory conditions may not experience benefit.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This interventional study examines the immediate effects of manual diaphragmatic facilitation on respiratory function and upper-extremity performance in healthy, actively training volleyball players. Participants will receive about 15 minutes of diaphragmatic facilitation or a sham session, with pre- and post-intervention measurements. Outcomes include spirometry, maximal inspiratory and expiratory pressures, the Medicine Ball Throw Test, the Closed Kinetic Chain Upper Extremity Stability Test, and scapular movement assessments. The goal is to determine whether enhancing diaphragmatic function can translate to better trunk stability and upper-limb performance during dynamic volleyball activity.
Why it matters
Potential benefit: If successful, athletes may experience improved breathing, core stability, and upper-extremity performance during volleyball play.
How similar studies have gone: Prior work in related domains has suggested diaphragmatic techniques can influence respiratory and trunk-control measures, but immediate performance benefits in athletes are less established.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Aged between 18 and 30 years. * Regularly participating in volleyball for at least one year. * Training at least twice per week or actively participating in volleyball at the league or tournament level. * No history of a serious upper extremity or trunk injury within the previous six months, i-including injuries affecting the shoulder, scapular region, or spine. * No diagnosed chronic respiratory disease, including asthma, chronic obstructive pulmonary disease, or allergic bronchitis. * Willing and able to provide written informed consent. Exclusion Criteria: * History of surgery involving the upper extremity, spine, or trunk within the previous six months, including shoulder arthroscopy or spinal disc surgery. * Presence of an active musculoskeletal injury, including tendinopathy, bursitis, or ligament injury. * Presence of a diagnosed respiratory disease, including asthma, chronic obstructive pulmonary disease, or bronchiectasis. * Presence of a diagnosed postural or spinal deformity that may affect study assessments, including scoliosis, clinically significant kyphosis, or clinically significant lordosis. * History of a neurological or cardiovascular disease.
Where it's running
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Istinye University
Istanbul, Turkey (Türkiye) Recruiting
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.