FlexibilityNCT07061041
Comparison of the Effects of Static Stretching and Full Range of Motion Strength Training on Posterior Band Flexibility
A study testing Strength training and Streching group in people with Flexibility and Strength Training Effects, run by Józef Piłsudski University of Physical Education at 1 site in Poland.
Trial summary
The study will be conducted in 2025. The methods used in the study are non-invasive methods. One study group will perform 2 series of static stretching of the posterior band once a week. The stretching time in each series will be 60s, and the duration of the intervention will be 6 weeks. Read more about this study
- Who is it for?
- Ages 18 to 25 yearsHealthy volunteers can take part
- Conditions the study is for
- Flexibility, Strength Training Effects, Static Stretching
- What is being tested?
- Strength training and Streching group
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 54 participants
- Where
- 1 sitePoland
- Study dates
- 2 Jul 2025to 25 Aug 2025
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 25 years
- All sexes
- Healthy volunteers accepted
- Adult
Who may be able to join
- Participants were required to be ≥18 years of age and free from musculoskeletal injuries or surgical procedures involving the lower extremities or trunk within the previous six months.
Who cannot join
- Participants were excluded if they were <18 years of age or had sustained a musculoskeletal injury or undergone surgery involving the lower extremities or trunk within the previous six months.
Trial locations and contacts
1 site in 1 country.
Poland1 site
Józef Piłsudski Academy of Physical Education in Warsaw
Warsaw, 00-968
About this study
The study will be conducted in 2025. The methods used in the study are non-invasive methods. One study group will perform 2 series of static stretching of the posterior band once a week. The stretching time in each series will be 60s, and the duration of the intervention will be 6 weeks. The test subjects will maintain a maximum prone position with their knee joints straight for a specified period of time during the stretching. The second study group will perform full range of motion strength training in the form of 3 series of 10 repetitions of the Romanian Deadlift (RDL) once a week, with the intervention duration also being 6 weeks. Prior to the start of the study, participants will undergo a toe-to-floor test to assess posterior band flexibility. The test will be repeated again after the intervention.
- Conditions
- Flexibility, Strength Training Effects, Static Stretching
- Being tested
- Strength training, Streching group
- Keywords
- flexibility, static streching, minimal-dose, hamstring flexibility
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Strength trainingOther
The group will perform one workout per week consisting of 3 series of the "Romanian deadlift" exercise of 10 repetitions. Each repetition will be performed at a specific pace - 3s in eccentric contraction and 1s in concentric contraction. The aforementioned exercise, the Romanian deadlift, will be performed by the subjects on a platform (elevation) in order to achieve maximum range of motion.
Streching groupOther
The group performed one training session per week consisting of 2 sets of 60 seconds of static stretching
| Study group | Role | What they receive |
|---|---|---|
| Control group | No intervention | Only tests were performed in the group, no intervention was introduced |
| Streching group | Experimental | The group performed one training session per week consisting of 2 sets of 60 seconds of static stretching Receives: Other: Streching group |
| Strength training group | Experimental | The group will perform one workout per week consisting of 3 series of the "Romanian deadlift" exercise of 10 repetitions. Each repetition will be performed at a specific pace - 3s in eccentric contraction and 1s in concentric contraction. The aforementioned exercise, the Romanian deadlift, will be performed by the subjects on a platform (elevation) in order to achieve maximum range of motion. Receives: Other: Strength training |
What is being measured
The primary outcome is the main question the study is designed to answer.
Flexibility
Flexibility was assessed using a modified stand-and-reach test. The participants stood with their feet shoulder-width apart and knees fully extended, then performed a forward bend, reaching as far as possible while maintaining straight legs. To measure the extent of their reach, a custom-built box was used. The box had the following dimensions: a length of 40 cm, a width of 45 cm, and a height of 35 cm. Each participant performed two trials, and the mean value was used for statistical analysis.. The same test was repeated after the 6-week intervention period to determine any improvements in flexibility.
Measured: From registration to completion of the study, the duration is up to 8 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted11 Jul 2025
- Study start2 Jul 2025
- Primary completion20 Aug 2025
- Study completion25 Aug 2025
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (2)Papers the sponsor has linked to this study.
- Other trials for FlexibilityStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind
- Who is masked
- Outcomes assessor
- Enrolment
- 54 participants (actual)
Sponsor and investigators
- Lead sponsor
- Józef Piłsudski University of Physical Education
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Michał Kaczorowski, Józef Piłsudski University of Physical Education
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07061041
- Sponsor's protocol ID
- SKE.0030.59.2025
- Status last verified
- Jul 2026
- First submitted
- 2 Jul 2025
- Last updated
- 20 Jul 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Shadmehr A, Hadian MR, Naiemi SS, Jalaie S. Hamstring flexibility in young women following passive stretch and muscle energy technique. J Back Musculoskelet Rehabil. 2009;22(3):143-8. doi: 10.3233/BMR-2009-0227.
PubMed 20023343Rosenfeldt M, Stien N, Behm DG, Saeterbakken AH, Andersen V. Comparison of resistance training vs static stretching on flexibility and maximal strength in healthy physically active adults, a randomized controlled trial. BMC Sports Sci Med Rehabil. 2024 Jun 28;16(1):142. doi: 10.1186/s13102-024-00934-1.
PubMed 38943165
Study at a glance
From the registry record, last updated by the sponsor on 20 Jul 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Comparison of the Effects of Static Stretching and Full Range of Motion Strength Training on Posterior Band Flexibility
- ClinicalTrials.gov ID
- NCT07061041
- Acronym / sponsor ID
- SKE.0030.59.2025
- Conditions
- Flexibility, Strength Training Effects, Static Stretching
- Keywords
- flexibility, static streching, minimal-dose, hamstring flexibility
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 54 participants (actual)
- Lead sponsor
- Józef Piłsudski University of Physical EducationUniversity, hospital or other
- Study start
- 2 Jul 2025 (actual)
- Primary completion
- 20 Aug 2025 (actual)
- Study completion
- 25 Aug 2025 (actual)
- First posted
- 11 Jul 2025 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The study will be conducted in 2025. The methods used in the study are non-invasive methods. One study group will perform 2 series of static stretching of the posterior band once a week. The stretching time in each series will be 60s, and the duration of the intervention will be 6 weeks. The test subjects will maintain a maximum prone position with their knee joints straight for a specified period of time during the stretching. The second study group will perform full range of motion strength training in the form of 3 series of 10 repetitions of the Romanian Deadlift (RDL) once a week, with the intervention duration also being 6 weeks. Prior to the start of the study, participants will undergo a toe-to-floor test to assess posterior band flexibility. The test will be repeated again after the intervention.
Study design
- Primary purpose
- Other
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (outcomes assessor)
- Number of arms
- 3
| Arm | Type | Receives |
|---|---|---|
| Control group | No intervention | –Only tests were performed in the group, no intervention was introduced |
| Streching group | Experimental | Other: Streching groupThe group performed one training session per week consisting of 2 sets of 60 seconds of static stretching |
| Strength training group | Experimental | Other: Strength trainingThe group will perform one workout per week consisting of 3 series of the "Romanian deadlift" exercise of 10 repetitions. Each repetition will be performed at a specific pace - 3s in eccentric contraction and 1s in concentric contraction. The aforementioned exercise, the Romanian deadlift, will be performed by the subjects on a platform (elevation) in order to achieve maximum range of motion. |
Who may qualify
- Ages
- 18 to 25 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- Participants were required to be ≥18 years of age and free from musculoskeletal injuries or surgical procedures involving the lower extremities or trunk within the previous six months.
Key exclusion criteria (1 listed)
- Participants were excluded if they were <18 years of age or had sustained a musculoskeletal injury or undergone surgery involving the lower extremities or trunk within the previous six months.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Strength trainingThe group will perform one workout per week consisting of 3 series of the "Romanian deadlift" exercise of 10 repetitions. Each repetition will be performed at a specific pace - 3s in eccentric contraction and 1s in concentric contraction. The aforementioned exercise, the Romanian deadlift, will be performed by the subjects on a platform (elevation) in order to achieve maximum range of motion. | Other | Strength training group |
| Streching groupThe group performed one training session per week consisting of 2 sets of 60 seconds of static stretching | Other | Streching group |
Primary outcome
Flexibility
Time frame: From registration to completion of the study, the duration is up to 8 weeks
Flexibility was assessed using a modified stand-and-reach test. The participants stood with their feet shoulder-width apart and knees fully extended, then performed a forward bend, reaching as far as possible while maintaining straight legs. To measure the extent of their reach, a custom-built box was used. The box had the following dimensions: a length of 40 cm, a width of 45 cm, and a height of 35 cm. Each participant performed two trials, and the mean value was used for statistical analysis.. The same test was repeated after the 6-week intervention period to determine any improvements in flexibility.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 20 Jul 2026.
- Background: PubMed 20023343Shadmehr A, Hadian MR, Naiemi SS, Jalaie S. Hamstring flexibility in young women following passive stretch and muscle energy technique. J Back Musculoskelet Rehabil. 2009;22(3):143-8. doi: 10.3233/BMR-2009-0227.
- Background: PubMed 38943165Rosenfeldt M, Stien N, Behm DG, Saeterbakken AH, Andersen V. Comparison of resistance training vs static stretching on flexibility and maximal strength in healthy physically active adults, a randomized controlled trial. BMC Sports Sci Med Rehabil. 2024 Jun 28;16(1):142. doi: 10.1186/s13102-024-00934-1.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Strength training and Streching group in people with Flexibility and Strength Training Effects, run by Józef Piłsudski University of Physical Education at 1 site in Poland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 20 Jul 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Poland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Flexibility (time frame: From registration to completion of the study, the duration is up to 8 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07061041, which also lists 2 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 20 Jul 2026; AzTrials last refreshed its copy on 7 Nov 2026.