Comparison of the Effects of Static Stretching and Full Range of Motion Strength Training on Posterior Band Flexibility

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.

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Study Overview

• Status: Completed
• Conditions: Static Stretching; Flexibility; Strength Training Effects
• Intervention / Treatment: Other: Streching group; Other: Strength training

• Study Type: Interventional
• Enrollment (Actual): 51
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Poland
  • Warsaw, Poland, 00-968
    • Józef Piłsudski Academy of Physical Education in Warsaw

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

• Age over 18 years,
• No lower limb injuries, no spinal injuries and no craniocerebral injuries in the last 6 months,
• No lower limb surgeries, no spinal surgeries and no central nervous system surgeries in the last 6 months,

Exclusion Criteria:

• Age under 18 years
• Injuries to the lower limbs, spine or craniocerebral injuries within the last 6 months,
• Surgical procedures to the lower limbs, spine or surgical procedures to the central nervous system within the last 6 months,

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Other
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
No Intervention: Control group; Only tests were performed in the group, no intervention was introduced
Experimental: Streching group; The group performed one training session per week consisting of 2 sets of 60 seconds of static stretching	Other: Streching group; The group performed one training session per week consisting of 2 sets of 60 seconds of static stretching
Experimental: Strength training group; 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.	Other: Strength training; 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.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
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 the test once. The same test was repeated after the 6-week intervention period to determine any improvements in flexibility.	From registration to completion of the study, the duration is up to 8 weeks

Collaborators and Investigators

• Sponsor: Józef Piłsudski University of Physical Education

Publications and helpful links

General 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.
• Rosenfeldt 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.

Study record dates

Study Major Dates

• Study Start (Actual): July 2, 2025
• Primary Completion (Actual): August 20, 2025
• Study Completion (Actual): August 25, 2025

Study Registration Dates

• First Submitted: July 2, 2025
• First Submitted That Met QC Criteria: July 2, 2025
• First Posted (Actual): July 11, 2025

Study Record Updates

• Last Update Posted (Actual): June 9, 2026
• Last Update Submitted That Met QC Criteria: June 7, 2026
• Last Verified: July 1, 2025

More Information

Terms related to this study

• Keywords: flexibility; hamstring flexibility; static streching; minimal-dose
• Additional Relevant MeSH Terms: Motor Activity; Movement; Musculoskeletal Physiological Phenomena; Musculoskeletal and Neural Physiological Phenomena; Therapeutics; Physical Therapy Modalities; Patient Care; Exercise Therapy; Rehabilitation; Aftercare; Continuity of Patient Care; Physical Conditioning, Human; Exercise; Resistance Training
• Other Study ID Numbers: SKE.0030.59.2025

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No