IASTM vs. Static Stretching for Hamstring Tightness
Official title: Comparison of the Short- and Long-Term Effects of Static Stretching and Instrument-Assisted Soft Tissue Mobilization on Flexibility, Performance, and Pressure Pain Threshold in Individuals With Hamstring Tightness: A Randomized Controlled Trial
Run by Gazi University · NCT07838844 · Data updated 2026-11-12
This study tests whether instrument-assisted soft tissue mobilization or static stretching better improves hamstring flexibility for adults with tight hamstrings.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 46 (estimated) |
| Sponsor | Gazi University Academic / other |
| Locations | 1 site (Kulu, Konya) |
| Status | Recruiting |
| Started | September 22, 2026 |
| Main results expected | December 31, 2026 |
| Study ends | December 31, 2026 |
| Registry record updated | November 4, 2026 |
| Trial ID | NCT07838844 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults 18 years and older with hamstring tightness defined by hip flexion ROM <65° on the SLR test, without neurological signs.
✕Probably not a fit
Individuals with prior lower-extremity trauma or surgery, neurological signs, pregnancy, or active lower-extremity skin issues may not experience benefit.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
In this randomized trial, 46 adults with hamstring tightness are assigned to receive either instrument-assisted soft tissue mobilization (IASTM) or static stretching. Treatments occur three times per week for four weeks, totaling 12 sessions. Outcomes include knee extension range of motion, pressure pain threshold, and physical performance measures (vertical jump and single-leg hop) assessed before treatment, 3 days after the last session, and 8 weeks after treatment ends. The goal is to compare short-term and longer-term effects of the two approaches on flexibility, pain sensitivity, and function. The trial uses computer-generated randomization and is conducted at Selcuk University, Konya, with lead sponsor GÖKHAN MARAŞ.
Why it matters
Potential benefit: If successful, the findings could help clinicians choose between IASTM and static stretching to improve hamstring flexibility and function over time.
How similar studies have gone: Previous studies have shown short-term flexibility gains with both approaches, but long-term data are limited, making this trial relatively novel in assessing 8-week outcomes.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Age 18 years or older * Hamstring tightness, defined as hip flexion range of motion \<65° on the Straight Leg Raise (SLR) test, without neurological signs * No diagnosed chronic musculoskeletal or systemic disease * Signed informed consent form Exclusion Criteria: * Previous trauma or surgical operation involving the lower extremity * Neurological symptoms radiating to one or both lower extremities due to hamstring injury, spinal pathology, or sciatic nerve involvement * Ankle instability * Pregnancy * Neurological signs elicited during the Straight Leg Raise (SLR) test * Hyperalgesia, hematoma, varicose veins, or active skin infection in the lower extremity
Where it's running
-
Selcuk University, Kulu Faculty of Health Sciences
Kulu, Konya, Turkey (Türkiye) Recruiting
Study contacts
- Principal investigator: Gokhan Maras, PT, PhD — Selcuk University, Kulu Faculty of Health Sciences
- Study coordinator: Gokhan Maras, PT, PhD
- Email: gokhan.maras@selcuk.edu.tr
- Phone: +90 542 785 9619
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.