Diaphragmatic Facilitation and Upper Extremity Performance in Volleyball Players
25. august 2026 oppdatert av: Kubra Kardes, Istinye University
Immediate Effects of Diaphragmatic Facilitation on Upper Extremity Performance in Volleyball Players
The diaphragm contributes to both respiration and trunk stabilization. Effective diaphragmatic function may support postural control, force transfer, and upper extremity performance during dynamic activities. However, evidence regarding the immediate effects of manual diaphragmatic facilitation on upper extremity performance in athletes remains limited.
This study aims to investigate the immediate effects of manual diaphragmatic facilitation on upper extremity performance and respiratory function in actively participating volleyball players. Participants will receive an approximately 15-minute session of manual diaphragmatic facilitation. Pulmonary function, respiratory muscle strength, and upper extremity strength, stability, and endurance will be assessed immediately before and after the intervention. Assessments will include spirometry, maximal inspiratory and expiratory pressures, the Medicine Ball Throw Test, the Closed Kinetic Chain Upper Extremity Stability Test, and the Scapular Endurance Test.
Studieoversikt
Status
Rekruttering
Forhold
Intervensjon / Behandling
Studietype
Intervensjonell
Registrering (Antatt)
50
Fase
- Ikke aktuelt
Kontakter og plasseringer
Denne delen inneholder kontaktinformasjon for de som utfører studien, og informasjon om hvor denne studien blir utført.
Studiesteder
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Istanbul, Tyrkia (Türkiye), 34010
- Rekruttering
- Istinye University
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Ta kontakt med:
- Kubra Kardes, Asst.Prof
- Telefonnummer: 05387115631
- E-post: kubrakoce@gmail.com
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Deltakelseskriterier
Forskere ser etter personer som passer til en bestemt beskrivelse, kalt kvalifikasjonskriterier. Noen eksempler på disse kriteriene er en persons generelle helsetilstand eller tidligere behandlinger.
Kvalifikasjonskriterier
Alder som er kvalifisert for studier
- Voksen
Tar imot friske frivillige
Ja
Beskrivelse
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.
Studieplan
Denne delen gir detaljer om studieplanen, inkludert hvordan studien er utformet og hva studien måler.
Hvordan er studiet utformet?
Designdetaljer
- Primært formål: Behandling
- Tildeling: Randomisert
- Intervensjonsmodell: Parallell tildeling
- Masking: Dobbelt
Våpen og intervensjoner
Deltakergruppe / Arm |
Intervensjon / Behandling |
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Eksperimentell: Intervention Group
Diaphragmatic Facilitation Group
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Following a standardized dynamic warm-up, participants in the intervention group will receive a single session of manual resisted diaphragmatic facilitation.
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Eksperimentell: Control Group
Sham Control Group
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Participants in the control group will complete the same dynamic warm-up protocol, followed by a sham intervention consisting of superficial, non-facilitatory palpation and general breathing instructions.
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Hva måler studien?
Primære resultatmål
Resultatmål |
Tiltaksbeskrivelse |
Tidsramme |
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Forced Vital Capacity
Tidsramme: 4 weeks
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Forced vital capacity is the maximum volume of air that a participant can forcibly exhale after taking the deepest possible breath.
It will be measured by spirometry and recorded in liters.
Higher values generally indicate greater ventilatory capacity, whereas lower values may indicate reduced pulmonary capacity or expiratory limitation.
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4 weeks
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Forced Expiratory Volume in One Second
Tidsramme: 4 weeks
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Forced expiratory volume in one second is the volume of air that a participant can forcibly exhale during the first second of a forced expiratory maneuver.
It will be measured by spirometry and recorded in liters.
Higher values generally indicate better expiratory airflow, whereas lower values may indicate reduced expiratory airflow.
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4 weeks
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Ratio of Forced Expiratory Volume in One Second to Forced Vital Capacity
Tidsramme: 4 weeks
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The ratio of forced expiratory volume in one second to forced vital capacity represents the proportion of the forced vital capacity exhaled during the first second of a forced expiratory maneuver.
It will be calculated from spirometric measurements and reported as a percentage.
Higher values generally indicate a greater proportion of air expelled during the first second, whereas lower values may indicate expiratory airflow limitation.
The results will be interpreted with consideration of age- and sex-appropriate reference values.
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4 weeks
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Maximal Inspiratory Pressure
Tidsramme: 4 weeks
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Maximal inspiratory pressure will be used to assess inspiratory muscle strength, primarily reflecting the function of the diaphragm and other inspiratory muscles.
The measurement will be repeated three times, and the highest valid value will be recorded in centimeters of water.
A higher absolute pressure value indicates greater inspiratory muscle strength, whereas a lower absolute pressure value indicates weaker inspiratory muscle strength.
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4 weeks
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Maximal Expiratory Pressure
Tidsramme: 4 weeks
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Maximal expiratory pressure will be used to assess expiratory muscle strength, particularly the strength of the abdominal and other expiratory muscles.
The measurement will be repeated three times, and the highest valid value will be recorded in centimeters of water.
A higher pressure value indicates greater expiratory muscle strength, whereas a lower pressure value indicates weaker expiratory muscle strength.
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4 weeks
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Medicine Ball Throw Distance
Tidsramme: 4 weeks
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Upper extremity explosive power will be assessed using the Medicine Ball Throw Test.
The participant will sit with the back supported against a wall and the legs extended and will be instructed to throw the medicine ball as far as possible.
Throwing distance will be measured in meters.
A longer distance indicates greater upper extremity explosive power, whereas a shorter distance indicates lower explosive power.
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4 weeks
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Closed Kinetic Chain Upper Extremity Stability Test Score
Tidsramme: 4 weeks
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Upper extremity stability, strength, power, and endurance will be assessed using the Closed Kinetic Chain Upper Extremity Stability Test.
The participant will assume a push-up position with the hands placed on two markers positioned 90 centimeters apart.
The participant will alternately move each hand across the body to touch the opposite marker during the specified test period.
The total number of valid touches will be recorded.
A higher number of touches indicates better upper extremity functional performance and stability, whereas a lower number indicates poorer performance.
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4 weeks
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Scapular Muscular Endurance Time
Tidsramme: 4 weeks
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The functional endurance of the scapular stabilizing muscles will be assessed using the Scapular Muscular Endurance Test.
An appropriately sized wooden rod will be positioned between the participant's elbows while both scapulae are maintained in a neutral position.
The length of time for which the participant can maintain the standardized test position will be recorded in seconds.
A longer duration indicates greater scapular muscular endurance, whereas a shorter duration indicates lower scapular muscular endurance.
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4 weeks
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Samarbeidspartnere og etterforskere
Det er her du vil finne personer og organisasjoner som er involvert i denne studien.
Sponsor
Studierekorddatoer
Disse datoene sporer fremdriften for innsending av studieposter og sammendragsresultater til ClinicalTrials.gov. Studieposter og rapporterte resultater gjennomgås av National Library of Medicine (NLM) for å sikre at de oppfyller spesifikke kvalitetskontrollstandarder før de legges ut på det offentlige nettstedet.
Studer hoveddatoer
Studiestart (Antatt)
30. august 2026
Primær fullføring (Antatt)
15. november 2026
Studiet fullført (Antatt)
30. november 2026
Datoer for studieregistrering
Først innsendt
21. august 2026
Først innsendt som oppfylte QC-kriteriene
21. august 2026
Først lagt ut (Faktiske)
25. august 2026
Oppdateringer av studieposter
Sist oppdatering lagt ut (Faktiske)
27. august 2026
Siste oppdatering sendt inn som oppfylte QC-kriteriene
25. august 2026
Sist bekreftet
1. august 2026
Mer informasjon
Begreper knyttet til denne studien
Nøkkelord
Ytterligere relevante MeSH-vilkår
Andre studie-ID-numre
- 2025/07
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