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Acute Effects of Proprioceptive Neuromuscular Facilitation on Hamstring-to-Quadriceps Strength Ratio (Acute Effects)

13. maj 2026 opdateret af: Coşkun YILMAZ, Gümüşhane Universıty

Acute Effects of Proprioceptive Neuromuscular Facilitation and Static Stretching on Hamstring-to-Quadriceps Strength Ratio in Healthy Young Men

This study aimed to compare the acute effects of proprioceptive neuromuscular facilitation (PNF) and static stretching on hamstring-to-quadriceps (H/Q) strength ratios in healthy young men. A randomized crossover design was used in which participants completed both stretching protocols on separate days. Isokinetic muscle strength and H/Q ratios were assessed following each intervention. The findings provide insight into the immediate effects of different stretching modalities on muscle balance and performance.

Studieoversigt

Status

Afsluttet

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

The present study investigated the acute effects of two commonly used stretching modalities-proprioceptive neuromuscular facilitation (PNF) and static stretching-on isokinetic muscle strength and hamstring-to-quadriceps (H/Q) ratios in physically active healthy young males. The study employed a randomized crossover design with repeated measures, allowing each participant to complete both experimental conditions under standardized laboratory settings.

Participants attended three sessions: a familiarization session followed by two experimental sessions separated by at least 48 hours. Each experimental session included a standardized warm-up, followed by either PNF or static stretching intervention, and subsequent isokinetic strength testing. Peak torque values for quadriceps (concentric) and hamstrings (concentric and eccentric) were measured using an isokinetic dynamometer at 60°/s. Traditional and functional H/Q ratios were calculated.

The primary aim was to determine whether these stretching modalities produce acute alterations in muscle strength and H/Q ratios. The study also examined whether the type of ratio (traditional vs. functional) significantly influences outcomes. Findings contribute to understanding the neuromuscular implications of stretching in warm-up protocols.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

23

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

  • Tyrkiet (Türkiye)
    • Trabzon, Ordu, Giresun, Rize, Artvin, Gümüşhane
      • Gümüşhane, Trabzon, Ordu, Giresun, Rize, Artvin, Gümüşhane, Tyrkiet (Türkiye), 29600
        • Gumushane Univetsity

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen

Tager imod sunde frivillige

Ja

Beskrivelse

Inclusion Criteria:

  • Age between 18 - 25 years, healthy male individuals
  • Physically active (≥3 days/week, ≥30 min/day)

Exclusion Criteria:

  • Musculoskeletal injury in the last 6 months
  • Any neurological or orthopedic disorder

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Andet
  • Tildeling: Randomiseret
  • Interventionel model: Crossover opgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: PNF Stretching
Participants performed four repetitions of PNF stretching consisting of a 6-second isometric hamstring contraction at approximately 60% of maximal voluntary contraction followed by a 30-second passive stretch. Rest intervals were standardized.
Andet: PNF Stretching
Participants performed four repetitions of PNF stretching consisting of a 6-second isometric hamstring contraction at approximately 60% of maximal voluntary contraction followed by a 30-second passive stretch. Rest intervals were standardized.
Andet: Static Stretching
Participants performed four repetitions of static hamstring stretching, each lasting 30 seconds, with 30-second rest intervals between repetitions.
Eksperimentel: Static Stretching
Participants performed four repetitions of static hamstring stretching, each lasting 30 seconds, with 30-second rest intervals between repetitions
Andet: PNF Stretching
Participants performed four repetitions of PNF stretching consisting of a 6-second isometric hamstring contraction at approximately 60% of maximal voluntary contraction followed by a 30-second passive stretch. Rest intervals were standardized.
Andet: Static Stretching
Participants performed four repetitions of static hamstring stretching, each lasting 30 seconds, with 30-second rest intervals between repetitions.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Hamstring-to-Quadriceps (H/Q) Ratio
Tidsramme: Immediately after intervention
Both traditional (Hcon/Qcon) and functional (Hecc/Qcon) ratios were calculated using isokinetic peak torque values.
Immediately after intervention

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Quadriceps Concentric Peak Torque
Tidsramme: Immediately post-intervention
Quadriceps Concentric Peak Torque
Immediately post-intervention
Hamstring Concentric Peak Torque
Tidsramme: Immediately post-intervention
Hamstring Concentric Peak Torque
Immediately post-intervention
Hamstring Eccentric Peak Torque
Tidsramme: Immediately post-intervention
Hamstring Eccentric Peak Torque
Immediately post-intervention

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Gümüşhane Universıty

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

5. marts 2025

Primær færdiggørelse (Faktiske)

15. april 2025

Studieafslutning (Faktiske)

20. april 2025

Datoer for studieregistrering

Først indsendt

6. maj 2026

Først indsendt, der opfyldte QC-kriterier

13. maj 2026

Først opslået (Faktiske)

15. maj 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

15. maj 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

13. maj 2026

Sidst verificeret

1. maj 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 2025/169

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

IPD-planbeskrivelse

Individual participant data will not be shared.

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Kliniske forsøg med Muskelstyrke

Kliniske forsøg med PNF Stretching

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