Publication: A complementary technique that improves flexibility without compromising strength: the role of ultrasound-guided nerve stimulation
Authors
Sola Martínez, Sergio ; Cánovas Ambit, Germán ; Baño Alcaraz, Aitor ; López Nicolás, Manuel ; García Vidal, José Antonio
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Facultades de la UMU::Facultad de Medicina
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Publisher
Elsevier
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DOI
https://doi.org/10.1016/j.jbmt.2026.08.010
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info:eu-repo/semantics/article
Description
Abstract
Background
Hamstring flexibility is a key determinant of musculoskeletal function and physical performance; however, conventional interventions such as static stretching may negatively affect muscle strength. Ultrasound-guided peripheral nerve stimulation has emerged as a potential neuromodulatory technique, although its effects on flexibility and strength remain insufficiently explored.
Objective
To evaluate the effects of ultrasound-guided electrical stimulation of the sciatic nerve on hamstring flexibility and muscle strength.
Methods
A randomized, double-blind, placebo-controlled clinical trial was conducted in 40participants. Participants were allocated to either an experimental group receiving ultrasound-guided peripheral nerve stimulation or a control group undergoing a sham intervention. Hamstring flexibility was assessed using the popliteal angle, toe-touch, and fingertip-to-floor tests, and muscle strength was measured with a digital dynamometer. Assessments were performed before and immediately after the intervention.
Results
Significant improvements in all flexibility measures were observed in the experimental group (p < 0.05), whereas no significant changes were detected in the control group (p > 0.05). Between-group comparisons demonstrated significantly greater improvements in flexibility in the experimental group (p < 0.05). No statistically significant differences were found in muscle strength between groups (p > 0.05).
Conclusion
Ultrasound-guided peripheral nerve stimulation improved immediate hamstring flexibility without evidence of an acute reduction in the measured strength outcomes in this exploratory sample.. This technique may represent a promising alternative for both clinical rehabilitation and performance optimization, although further studies are required to confirm the durability of its effects.
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Citation
Journal of Bodywork and Movement Therapies, Available online 20 August 2026, In Press, Journal Pre-proof
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