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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Key information

Conditions

Flexibility Static Stretching Strength Training Effects

Age range

18 year–25 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Józef Piłsudski Academy of Physical Education in Warsaw

Warsaw, 00-968, Poland

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

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.

Exclusion criteria

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.

Treatment and study plan

Strength training

Other

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 group

Other

The group performed one training session per week consisting of 2 sets of 60 seconds of static stretching

Primary outcomes

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.

Sponsors and collaborators

Lead sponsor

Józef Piłsudski University of Physical Education

Other

Registry information

Important dates

Study start: 2025
Primary completion: 2025
Study completion: 2025
First posted: Jul 11, 2025
Registry last updated: Jul 20, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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