Comparison of Eccentric Exercise and Static Stretching on Muscle Flexibility

NCT ID: NCT06469346

Last Updated: 2025-08-19

Basic Information

• Recruitment Status: ACTIVE_NOT_RECRUITING
• Clinical Phase: NA
• Total Enrollment: 42 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-03-03
• Study Completion Date: 2025-12-30

Brief 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.

Detailed Description

Hypothesis: The increase in hamstring flexibility after 6 weeks of eccentric resistance training in young males would be similar compared to 6 weeks static stretching training in the same population.

Goals: The primary aim of the study is to compare the effectiveness of 6 weeks eccentric resistance training vs 6 weeks static stretching training on hamstring flexibility in young males.

Specific Goals: Determine the effect of 6 weeks excentric exercise training and 6 weeks static stretching training on unilateral maximal isometric voluntary strength between both groups

To compare the effect of 6 weeks excentric exercise training and 6 weeks static stretching training in structural changes on muscle architecture (pennation angle, fascicle length and muscle thickness).

Methodology:

Study design: Forty two young males between 18 and 35 years will be divided into three groups: hamstring eccentric resistance training group (EEG, n=14), hamstring static stretching group (SSG, n=14) and control group (CG, n=14). Volunteers of eccentric resistance training group will be subjected to 6 weeks of Nordic hamstring exercise (3x/wk), while volunteers of static stretching group will be subjected to 6 weeks of hamstring passive static stretching (3x/wk). Control group will not attend any type of intervention. Before and after 6 weeks of training, Knee Extension Angle and Sit and Reach test will be performed for measuring hamstring flexibility. Unilateral Hamstring Isometric Maximal Voluntary Strength will be determined by load cell force transducer, and pennation angle, fascicle length and muscle thickness of Long Head Biceps Femoris will be conducted through muscle ultrasonography

Study parameters/endpoint:

The main study endpoint is the increase in hamstring flexibility assessed with Knee Extension Angle and Sit and Reach Test.

Secondary endpoints include Unilateral Hamstring Isometric Maximal Voluntary Strength (IMVS) and Architectural changes in Long Head Biceps Femoris muscle.

Other parameters include age, body weight, body height, body mass index (BMI), level of physical activity.

Expected results: With the proposed project, the investigators expect that eccentric exercise training will increase hamstring muscle flexibility at similar level compared with static stretching training. The findings will define the potential of eccentric exercise training on muscle flexibility in healthy participants. These results could expand the benefits of this type of exercise training focused on being included in populations with limited mobility such as elderly and injured populations

Conditions

Muscle Stretching Exercise; Range of Motion, Articular

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

Eccentric Exercise Group (EEG)

These participants will be subjected to 6 weeks of Nordic hamstring eccentric exercise (3 times per week)

Group Type: EXPERIMENTAL

Nordic Hamstring Eccentric Exercise Training

Intervention Type: OTHER

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

Static Stretching Group (SSG)

These participants will be subjected to 6 weeks of passive static stretching on hamstring muscle (3 times per week)

Group Type: EXPERIMENTAL

Passive Hamstring Static Stretching Training

Intervention Type: OTHER

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

Control Group

These participants will not be under any type of treatment during the intervention protocol

Group Type: OTHER

Control Group

Intervention Type: OTHER

No intervention

Interventions

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

Intervention Type: 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

Intervention Type: OTHER

Control Group

No intervention

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Masculine University students between 18 and 35 years old
• Physically Inactive considering physical activity recommendations from World Health Organization
• Bilateral hamstring muscle stiffness defined as <160° in passive Knee Extension Angle Test
• Body Max Index 18,5 < BMI < 24,9 kg/m2

Exclusion Criteria

• Lower back and lower limb (hip, thigh, knee, ankle) musculoskeletal injury in the last 12 months.
• Hamstring injury (strain, tendinopathy, tendon avulsion) previously during the period of life
• Dietary anabolic supplements consumption
• Musculoskeletal, cardiovascular, respiratory o similar health condition that limits participation on physical activity programs
• Regular resistance training (2 or more times per week, carrying out progressive training) in the previous 6 months
• Smoker (1 cigarette per day)

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 35 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: Yes

Sponsors

Universidad de La Frontera

OTHER

Sponsor Role: lead

Responsible Party

Gabriel Nasri Marzuca-Nassr

Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Gabriel N Marzuca-Nassr

Role: PRINCIPAL_INVESTIGATOR

Universidad de La Frontera

Locations

Universidad de La Frontera

Temuco, Cautín, Chile

Countries

Chile

Other Identifiers

MGTFNG-2024

Identifier Type: -

Identifier Source: org_study_id