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Updated: Dec 7, 2025
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Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
Published on: May 1, 2018
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Effectiveness of hamstring stretching using a pressure biofeedback unit for 4 weeks: A randomized controlled trial
Jin-Oh Ahn1, Jong-Hyuck Weon2, Eun-Kyung Koh3
1Department of KEMA Therapy, Graduate School of Humanities Industry, Joongbu University, Geumsan, South Korea.
Summary
Using a pressure biofeedback unit (PBU) to maintain anterior pelvic tilting during hamstring stretching significantly improves flexibility. This method enhances the active knee extension test results for individuals with hamstring shortness.
Area of Science:
- Sports Rehabilitation
- Biomechanics
- Physical Therapy
Background:
- Hamstring stretching and length testing are common in lower back pain (LBP) management.
- Optimal hamstring assessment requires maintaining an anterior pelvic tilt (APT).
- The effectiveness of pressure biofeedback units (PBU) for ensuring APT during hamstring interventions is unstudied.
Purpose of the Study:
- To evaluate the efficacy of using a PBU for hamstring stretching.
- To determine if PBU enhances hamstring flexibility during active knee extension (AKE) tests.
Main Methods:
- Forty participants with hamstring shortness were randomized into control (no PBU) and intervention (PBU) groups.
- Both groups underwent four weeks of active knee extension (AKE) stretching.
- AKE tests were performed pre- and post-intervention, with and without PBU.
Main Results:
- The PBU group showed a significantly greater increase in AKE angle post-intervention compared to the control group.
- Both groups improved AKE angle with PBU, but the intervention group's improvement was more pronounced.
- No significant group effect was observed for AKE tests without PBU.
Conclusions:
- A pressure biofeedback unit (PBU) is recommended for maintaining anterior pelvic tilt during hamstring length tests and stretching.
- PBU use enhances the effectiveness of hamstring stretching interventions.
- This technique can optimize rehabilitation outcomes for individuals with hamstring tightness.
