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Updated: Jun 2, 2026
Muscle Imbalances: Testing and Training Functional Eccentric Hamstring Strength in Athletic Populations
Published on: May 1, 2018
Effects of a 6-Week Home-Based High- or Regular-Volume Static Stretching or Hamstring Resistance Exercise in Young
Nongnuch Luangpon1, Wirasinee Srijunto1, Sirawee Chaovalit2
1Allied Health Sciences Faculty, Burapha University, Chonburi, Thailand.
Objectives:
This study aimed to examine the effects of unilateral long-duration static stretching (LS) on range of motion (ROM), musculotendinous unit (MTU) stiffness, muscle thickness (MT), strength, and contralateral effects (CE) in young men with hamstring tightness.
Methods:
Sixty-eight young men (22.0 ± 1.7 years) were randomly assigned to one of four groups: LS, typical-duration static stretching (SS), hamstring resistance exercise (HRE), or control. ROM, MTU stiffness, MT, and knee-flexor peak torque were assessed at baseline, after the 6-week intervention, and at the 3-month follow-up.
Results:
ROM improvement after the 6-week was observed across the LS, SS, and HRE groups (all p<0.05). Significant decreases in MTU stiffness were observed, with reductions of 0.13 Nm/deg in the hamstrings for both the stretching groups (all p<0.05). At the 3-month follow-up, reductions in MTU stiffness remained evident in the LS group. A significant time effect was observed for bilateral peak torque without interaction or group effects, while MT showed no changes.
Conclusions:
One hour of hamstring stretching did not result in superior improvements in ROM, MTU stiffness, or morphological and CE adaptations compared to other exercise modalities. Nevertheless, SS remains a time-efficient approach to enhance flexibility and mechanical properties in a home-based setting.
Clinical Trial Registration:
Thai Clinical Trials Registry (TCTR20250219007).
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