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Effects of Inter-Set Rest Intervals on Muscle Damage After Flywheel Exercise in Untrained Men (RCT)

8 septembre 2026 mis à jour par: Federal University of Vicosa

Effects of Different Inter-Set Rest Intervals on Indirect Markers of Muscle Damage and Mechanical Parameters After Flywheel Resistance Training in Untrained Men: A Randomized Parallel-Group Clinical Trial

This randomized parallel-group clinical trial will compare the acute effects of three different inter-set rest intervals during a single lower-limb flywheel resistance exercise session in untrained men. Participants will be randomly allocated to one of three groups: 1-minute, 2-minute, or 3-minute inter-set rest interval. The primary outcome will be the change in maximal voluntary isometric contraction of the knee extensors 48 hours after exercise. Secondary outcomes will include mechanical variables during the exercise session, countermovement jump performance, knee flexor maximal voluntary isometric contraction, muscle soreness, pressure pain threshold, range of motion, ultrasound-derived muscle thickness and echo intensity, perceived exertion, perceived discomfort, perceived recovery status, creatine kinase, and lactate dehydrogenase.

Aperçu de l'étude

Statut

Recrutement

Les conditions

Intervention / Traitement

Description détaillée

Participants will complete seven laboratory visits. The first two visits will be used for baseline assessments and test-retest reliability. The third and fourth visits will be used for technical familiarization with the flywheel exercises. The fifth visit will include the experimental flywheel resistance exercise session and immediate post-exercise assessments. The sixth and seventh visits will include follow-up assessments 48 and 96 hours after the experimental session, respectively. Blood samples for creatine kinase and lactate dehydrogenase will be collected before the experimental session and 72 hours after exercise in a partner laboratory.

The experimental session will include squat, Romanian deadlift, knee extension, and knee flexion exercises performed using flywheel devices. All groups will perform the same exercises, volume, inertia, and execution instructions. The only difference between groups will be the inter-set rest interval: 1 minute, 2 minutes, or 3 minutes.

Type d'étude

Interventionnel

Inscription (Estimé)

30

Phase

  • N'est pas applicable

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Lieux d'étude

    • Minas Gerais
      • Viçosa, Minas Gerais, Brésil, 36570-900
        • Recrutement
        • Federal University of Vicosa
        • Contact:

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Adulte

Accepte les volontaires sains

Oui

La description

Inclusion Criteria:

  • Age between 18 and 40 years;
  • Apparently healthy and clinically able to perform physical exercise;
  • No participation in structured resistance training during the previous 6 months;
  • Agreement to comply with all study visits and procedures;
  • Signed informed consent form.

Exclusion Criteria:

  • History of lower-limb musculoskeletal injury or surgery that may impair performance or safety during the proposed exercise protocol;
  • Current pain, injury, or functional limitation in the lower limbs;
  • Use of ergogenic aids that may affect physical performance or muscle recovery;
  • Use of analgesic or anti-inflammatory medication during the study period;
  • Failure to attend the scheduled visits required for the primary outcome assessment.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Science basique
  • Répartition: Randomisé
  • Modèle interventionnel: Affectation parallèle
  • Masquage: Aucun (étiquette ouverte)

Armes et Interventions

Groupe de participants / Bras
Intervention / Traitement
Expérimental: 1-Minute Inter-set Rest Interval
Participants allocated to this group will perform a single lower-limb flywheel resistance exercise session using a 1-minute inter-set rest interval. The session will include squat, Romanian deadlift, knee extension, and knee flexion exercises.
Participants will perform a single lower-limb flywheel resistance exercise session using a 1-minute inter-set rest interval. The session will include squat, Romanian deadlift, knee extension, and knee flexion exercises. Each exercise will be performed for 4 sets of 2 preparatory repetitions followed by 8 valid repetitions, using the same flywheel inertia, exercise order, and execution instructions across all groups. Participants will be instructed to perform the concentric phase as fast as possible and to brake the eccentric phase during the final portion of the movement. The interval between exercises will be standardized at 3 minutes.
Expérimental: 2-Minute Inter-set Rest Interval
Participants allocated to this group will perform a single lower-limb flywheel resistance exercise session using a 1-minute inter-set rest interval. The session will include squat, Romanian deadlift, knee extension, and knee flexion exercises.
Participants will perform a single lower-limb flywheel resistance exercise session using a 2-minute inter-set rest interval. The session will include squat, Romanian deadlift, knee extension, and knee flexion exercises. Each exercise will be performed for 4 sets of 2 preparatory repetitions followed by 8 valid repetitions, using the same flywheel inertia, exercise order, and execution instructions across all groups. Participants will be instructed to perform the concentric phase as fast as possible and to brake the eccentric phase during the final portion of the movement. The interval between exercises will be standardized at 3 minutes.
Expérimental: 3-Minute Inter-set Rest Interval
Participants allocated to this group will perform a single lower-limb flywheel resistance exercise session using a 1-minute inter-set rest interval. The session will include squat, Romanian deadlift, knee extension, and knee flexion exercises.
Participants will perform a single lower-limb flywheel resistance exercise session using a 3-minute inter-set rest interval. The session will include squat, Romanian deadlift, knee extension, and knee flexion exercises. Each exercise will be performed for 4 sets of 2 preparatory repetitions followed by 8 valid repetitions, using the same flywheel inertia, exercise order, and execution instructions across all groups. Participants will be instructed to perform the concentric phase as fast as possible and to brake the eccentric phase during the final portion of the movement. The interval between exercises will be standardized at 3 minutes.

Que mesure l'étude ?

Principaux critères de jugement

Mesure des résultats
Description de la mesure
Délai
Change in maximal voluntary isometric contraction of the knee extensors
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Maximal voluntary isometric contraction of the knee extensors will be assessed using a load cell with the knee positioned at 90 degrees of flexion. The primary outcome will be the change in force between baseline and immediately, 48 hours, and 96 hours after the experimental exercise session using a flywheel.
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in maximal voluntary isometric contraction of the knee flexors
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
The maximum voluntary isometric contraction of the knee flexors will be assessed using a load cell with the knee positioned at 45 degrees of flexion. The primary outcome will be the change in force between baseline and immediately, 48 hours, and 96 hours after the experimental exercise session using a flywheel.
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session

Mesures de résultats secondaires

Mesure des résultats
Description de la mesure
Délai
Change in vastus lateralis and biceps femoris long head muscle thickness
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in vastus lateralis and biceps femoris long head echo intensity
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in countermovement jump performance
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in active and passive knee flexion and extension range of motion
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in lower-limb muscle soreness score assessed by the Visual Analogue Scale
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Lower-limb muscle soreness will be assessed using a 100-mm Visual Analogue Scale. The scale ranges from 0 to 100, where 0 indicates no pain and 100 indicates the worst possible pain. Higher scores indicate greater muscle soreness. The outcome will be reported as the change in muscle soreness score from baseline to the post-exercise time points.
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in pressure pain threshold of the thigh muscles
Délai: Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Baseline, 10 minutes after the experimental exercise session, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Change in serum creatine kinase and lactate dehydrogenase concentrations
Délai: Pre-exercise and 72 hours after the experimental exercise session
Pre-exercise and 72 hours after the experimental exercise session
Peak concentric and eccentric power output during flywheel exercise
Délai: During all 16 sets performed in the experimental exercise session
Peak concentric and eccentric power output will be recorded during each valid repetition of the flywheel exercise session using a load cell connected to the flywheel device. Data will be collected for all sets and exercises, excluding the initial preparatory repetitions. The outcome will be reported as peak concentric power, peak eccentric power, and eccentric/concentric power ratio across the experimental exercise session.
During all 16 sets performed in the experimental exercise session
Rating of perceived exertion assessed by the OMNI-Resistance Exercise Scale
Délai: After each of the 16 sets performed during the experimental exercise session and 10 minutes after the experimental exercise session
Rating of perceived exertion will be assessed using the OMNI-Resistance Exercise Scale. The scale ranges from 0 to 10, where 0 indicates extremely easy and 10 indicates extremely hard. Higher scores indicate greater perceived exertion. The outcome will be reported after each set of the experimental flywheel exercise session and 10 minutes after the end of the session.
After each of the 16 sets performed during the experimental exercise session and 10 minutes after the experimental exercise session
Perceived discomfort assessed by the Discomfort Scale
Délai: After each of the 16 sets performed during the experimental exercise session and 10 minutes after the experimental exercise session
Perceived discomfort will be assessed using a 0-to-100 Discomfort Scale. The scale ranges from 0 to 100, where 0 indicates no discomfort and 100 indicates maximal discomfort. Higher scores indicate greater perceived discomfort. The outcome will be reported after each set of the experimental flywheel exercise session and 10 minutes after the end of the session.
After each of the 16 sets performed during the experimental exercise session and 10 minutes after the experimental exercise session
Perceived recovery status assessed by the Perceived Recovery Status Scale
Délai: Baseline, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session
Perceived recovery status will be assessed using the Perceived Recovery Status Scale. The scale ranges from 0 to 10, where 0 indicates very poor recovery and 10 indicates full recovery. Higher scores indicate better perceived recovery. The outcome will be reported as the perceived recovery status score at baseline and at the post-exercise follow-up time points.
Baseline, 48 hours after the experimental exercise session, and 96 hours after the experimental exercise session

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Parrainer

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude (Réel)

1 juin 2026

Achèvement primaire (Estimé)

1 octobre 2026

Achèvement de l'étude (Estimé)

1 octobre 2026

Dates d'inscription aux études

Première soumission

29 mai 2026

Première soumission répondant aux critères de contrôle qualité

25 juin 2026

Première publication (Réel)

1 juillet 2026

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Réel)

11 septembre 2026

Dernière mise à jour soumise répondant aux critères de contrôle qualité

8 septembre 2026

Dernière vérification

1 septembre 2026

Plus d'information

Termes liés à cette étude

Autres numéros d'identification d'étude

  • 7.151.525 (Autre identifiant: Ethics Committee Approval Number)
  • 81740024.5.0000.5153 (Autre identifiant: CAAE)

Plan pour les données individuelles des participants (IPD)

Prévoyez-vous de partager les données individuelles des participants (DPI) ?

NON

Informations sur les médicaments et les dispositifs, documents d'étude

Étudie un produit pharmaceutique réglementé par la FDA américaine

Non

Étudie un produit d'appareil réglementé par la FDA américaine

Non

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .