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Acute Muscular and Vascular Responses to a Single Session of Exercise With BFR in COPD (2BFREE_aigu)

25 giugno 2026 aggiornato da: University Hospital, Grenoble

Blood Flow Restriction (BFR): a Novel Approach to Potentiate the Effects of Rehabilitative Exercise Training in COPD? Study of Acute - Muscular, and Vascular - Responses to a Single Session of Exercise With BFR

Exercise training is a cornerstone of pulmonary rehabilitation (PR) in patients with chronic obstructive pulmonary disease (COPD). However, some patients derive limited benefits from conventional exercise programs. Previous studies suggest that the magnitude of exercise-induced muscle fatigue is associated with training effectiveness, with patients unable to develop significant muscle fatigue ("non-fatiguers") showing smaller improvements in functional capacity and quality of life.

Blood flow restriction (BFR) exercise consists in performing physical exercise while applying external pressure to the proximal part of the exercising limb, thereby reducing oxygen delivery to the muscles and limiting metabolite clearance. This approach has been shown to induce significant muscular adaptations despite the use of low exercise intensities. Because exercise intensity in COPD patients is often constrained by ventilatory limitations, BFR training may enhance muscle adaptations while reducing respiratory stress, potentially improving the effectiveness of PR.

The primary objective of this monocentric randomized crossover study is to compare lower-limb muscle fatigue induced by a single exercise session performed with BFR versus a standard exercise session in patients with COPD.

Panoramica dello studio

Descrizione dettagliata

Two exercise modalities commonly used in pulmonary rehabilitation will be investigated independently in two sub-studies: (1) resistance training performed with BFR or without BFR, and (2) aerobic endurance training performed with BFR or without BFR.

Tipo di studio

Interventistico

Iscrizione (Stimato)

40

Fase

  • Non applicabile

Contatti e Sedi

Questa sezione fornisce i recapiti di coloro che conducono lo studio e informazioni su dove viene condotto lo studio.

Contatto studio

Backup dei contatti dello studio

Luoghi di studio

    • Auvergne-Rhône-Alpes
      • La Tronche, Auvergne-Rhône-Alpes, Francia, 38700

Criteri di partecipazione

I ricercatori cercano persone che corrispondano a una certa descrizione, chiamata criteri di ammissibilità. Alcuni esempi di questi criteri sono le condizioni generali di salute di una persona o trattamenti precedenti.

Criteri di ammissibilità

Età idonea allo studio

  • Adulto
  • Adulto più anziano

Accetta volontari sani

No

Descrizione

Inclusion Criteria:

  • Negative pregnancy test and use of an acceptable contraceptive method throughout the study duration for women of childbearing potential
  • Established COPD defined as obstructive ventilatory defect (FEV1/FVC < 0.70 or below the 5th percentile)
  • Resting lung hyperinflation defined as functional residual capacity > 2.5 z-scores according to the Global Lung Function Initiative (GLI)
  • Clinical stability of COPD for at least 3 months, with no recent exacerbation requiring treatment modification
  • Covered by a national health insurance system
  • Able and willing to provide written informed consent

Non-inclusion Criteria:

  • Presence of a medical device incompatible with magnetic stimulation
  • Inability to perform an exercise test on a cycle ergometer
  • Any usual contraindication to exercise testing, including:

    • Recent myocardial infarction (3-5 days)
    • Unstable coronary insufficiency
    • Severe stenotic valvular disease
    • Uncontrolled arrhythmia with hemodynamic instability
    • Recent unexplained syncope
    • Uncontrolled heart failure
    • Uncontrolled arterial hypertension (systolic blood pressure ≥200 mmHg and/or diastolic blood pressure ≥110 mmHg at rest)
    • Acute thromboembolic disease and/or pulmonary edema
  • Conditions contraindicating the use of blood flow restriction (BFR), including:

    • Coagulation disorder
    • Peripheral neuropathy
    • Uncontrolled hypertension (>160/100 mmHg)
    • Peripheral arterial disease
    • History of venous thrombosis
    • Intensive care unit stay within the last 3 months
  • Participation in another study during an exclusion period
  • Inability to be contacted in case of emergency
  • Individuals covered under Articles L1121-5 to L1121-8 of the French Public Health Code (protected populations, including pregnant or breastfeeding women, prisoners, minors, individuals under legal protection, psychiatric inpatients, etc.)
  • Staff members with a hierarchical relationship with the principal investigator

Piano di studio

Questa sezione fornisce i dettagli del piano di studio, compreso il modo in cui lo studio è progettato e ciò che lo studio sta misurando.

Come è strutturato lo studio?

Dettagli di progettazione

  • Scopo principale: Trattamento
  • Assegnazione: Randomizzato
  • Modello interventistico: Assegnazione incrociata
  • Mascheramento: Nessuno (etichetta aperta)

Armi e interventi

Gruppo di partecipanti / Arm
Intervento / Trattamento
Sperimentale: Blood flow restricted exercise session
Sub-study 1: resistance exercise session with Blood Flow Restriction (RE-BFR); Sub-study 2: aerobic endurance exercise session with Blood Flow Restriction (END-BFR).

Sub-study 1 (RE-BFR): Resistance training consisting of 1 × 30 repetitions followed by 3 × 15 repetitions at 30% 1-RM, performed with thigh BFR to 50-60% of arterial occlusion pressure (AOP).

Sub-study 2 (END-BFR): Low-intensity cycling exercise (~30% peak aerobic power) performed with thigh BFR to 50-60% of AOP.

Comparatore attivo: Standard exercise session
Sub-study 1: resistance exercise session (RE); Sub-study 2: aerobic endurance exercise session (END).

Sub-study 1 (RE): Resistance exercise consisting of 4 × 10 repetitions at 60-70% 1-RM.

Sub-study 2 (END): Conventional aerobic endurance cycling exercise performed at ~50% peak aerobic power.

Cosa sta misurando lo studio?

Misure di risultato primarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Muscle fatigue
Lasso di tempo: Assessed 15-minutes before, and 3, 30, 60-minutes after exercise
Muscle fatigue assessed by magnetic stimulation of the femoral nerve
Assessed 15-minutes before, and 3, 30, 60-minutes after exercise

Misure di risultato secondarie

Misura del risultato
Misura Descrizione
Lasso di tempo
Flow Mediated Dilation (FMD)
Lasso di tempo: 30-minutes pre-exercise, and 10 and 75-minutes post-exercise
Brachial artery FMD assessed by ultrasound
30-minutes pre-exercise, and 10 and 75-minutes post-exercise
Symptoms of dyspnea
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Modified Borg scale: ranging from 0 (nothing at all) to 10 (maximal)
Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Affective valence
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Feeling scale: ranging from -5 (very bad) to 5 (very good)
Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Affective intensity
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Felt Arousal Scale: ranging from 1 (low activation state) to 6 (high activation state)
Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Oxygen uptake
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Using metabolic chart, in L/min
Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Carbon dioxide output
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Using metabolic chart, in L/min
Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Minute ventilation
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Using metabolic chart, in L/min
Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Breathing pattern
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Tidal volume (in L) and respiratory rate (in breaths per minute), using metabolic chart
Assessed at the end of each exercise set/bout (sub-study 1) or continuously throughout exercise (sub-study 2).
Heart rate
Lasso di tempo: Continuous monitoring throughout the exercise session.
Using electrocardiogram, in beats/min
Continuous monitoring throughout the exercise session.
Blood pressure
Lasso di tempo: Continuous monitoring throughout the exercise session.
Using digital cuff system, in mmHg
Continuous monitoring throughout the exercise session.
Cardiac output
Lasso di tempo: Continuous monitoring throughout the exercise session.
Using impedance cardiography, in L/min
Continuous monitoring throughout the exercise session.
Leg discomfort
Lasso di tempo: Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)
Modified Borg scale: ranging from 0 (nothing at all) to 10 (maximal)
Assessed at the end of each exercise set/bout (sub-study 1) or every 2 minutes throughout exercise (sub-study 2)

Collaboratori e investigatori

Qui è dove troverai le persone e le organizzazioni coinvolte in questo studio.

Pubblicazioni e link utili

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Studiare le date dei record

Queste date tengono traccia dell'avanzamento della registrazione dello studio e dell'invio dei risultati di sintesi a ClinicalTrials.gov. I record degli studi e i risultati riportati vengono esaminati dalla National Library of Medicine (NLM) per assicurarsi che soddisfino specifici standard di controllo della qualità prima di essere pubblicati sul sito Web pubblico.

Studia le date principali

Inizio studio (Stimato)

1 novembre 2026

Completamento primario (Stimato)

1 dicembre 2028

Completamento dello studio (Stimato)

1 dicembre 2028

Date di iscrizione allo studio

Primo inviato

11 giugno 2026

Primo inviato che soddisfa i criteri di controllo qualità

19 giugno 2026

Primo Inserito (Effettivo)

25 giugno 2026

Aggiornamenti dei record di studio

Ultimo aggiornamento pubblicato (Effettivo)

30 giugno 2026

Ultimo aggiornamento inviato che soddisfa i criteri QC

25 giugno 2026

Ultimo verificato

1 giugno 2026

Maggiori informazioni

Termini relativi a questo studio

Piano per i dati dei singoli partecipanti (IPD)

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Descrizione del piano IPD

The data that support the findings of this study will be made available from the contact person/backup upon reasonable request.

Informazioni su farmaci e dispositivi, documenti di studio

Studia un prodotto farmaceutico regolamentato dalla FDA degli Stati Uniti

No

Studia un dispositivo regolamentato dalla FDA degli Stati Uniti

No

Queste informazioni sono state recuperate direttamente dal sito web clinicaltrials.gov senza alcuna modifica. In caso di richieste di modifica, rimozione o aggiornamento dei dettagli dello studio, contattare register@clinicaltrials.gov. Non appena verrà implementata una modifica su clinicaltrials.gov, questa verrà aggiornata automaticamente anche sul nostro sito web .

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