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Comparison of Eccentric Exercise and Static Stretching on Muscle Flexibility

NCT06469346 · Status: ACTIVE_NOT_RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 42

Last updated 2025-08-19

No results posted yet for this study

Summary

Background: Muscle flexibility is a fundamental physical quality for body development, daily life and sports activities, and also for maintaining muscle quality during aging. Limited flexibility leads to an increased prevalence of musculoskeletal injury in general population and longer return to sports activities.

Among the existent strategies to increase muscle flexibility in sports training and physical rehabilitation, static stretching is commonly used by health and physical activity professionals. Its effectiveness in increasing flexibility has been widely demonstrated; however its effects on muscle strength and power remains controversial.

Therefore, eccentric resistance exercise has been proposed as an effective intervention for increasing muscle flexibility through structural changes on muscle architecture (pennation angle and fascicle length) with the additional benefit of resistance training on muscle strength and power. Nonetheless, its unknown if the increase in muscle flexibility through eccentric resistance exercise could be similar to what has been previously demonstrated with static stretching.

Conditions

  • Muscle Stretching Exercise
  • Range of Motion, Articular

Interventions

OTHER

Nordic Hamstring Eccentric Exercise Training

Warm up: stationary bycicle at 50 watts and 60 bpm Mobility exercises for hip and knee joint Nordic eccentric exercise protocol: * Week 1: 2 sets x 5 repetitions * Week 2: 2 sets x 6 repetitions * Week 3: 3 sets x 6 repetitions * Week 4-6: 3 sets x 8 repetitions

OTHER

Passive Hamstring Static Stretching Training

Warm up: stationary bycicle at 50 watts and 60 bpm Mobility exercises for hip and knee joint * Week 1-2: 1 set x 2 repetitions of 30 seconds * Week 3: 1 set x 3 repetitions of 30 seconds * Week 4-6: 1 set x 3 reps of 40 seconds

OTHER

Control Group

No intervention

Sponsors & Collaborators

  • Universidad de La Frontera

    lead OTHER

Principal Investigators

  • Gabriel N Marzuca-Nassr · Universidad de La Frontera

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
35 Years
Sex
MALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2025-03-03
Primary Completion
2025-12-30
Completion
2025-12-30

Countries

  • Chile

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT06469346 on ClinicalTrials.gov