Immediate Effects of Neuromuscular Electrical Stimulation on Pain and Function in Achilles Tendon Disorders
Immediate Effects of Neuromuscular Electrical Stimulation on Pain and Functional Performance in Individuals With Achilles Tendinopathy and Tendon Rupture: A Randomized Crossover Clinical Trial
University of Brasilia
30 participants
Jan 6, 2026
INTERVENTIONAL
Conditions
Summary
The Achilles tendon exhibits high tensile strength and can withstand extremely high loads. However, it is susceptible to injuries such as tendinopathies and ruptures, which are associated with structural alterations and loss of function. Strategies have been investigated to enhance clinical rehabilitation. Nevertheless, the effects of neuromuscular electrical stimulation on pain and functional improvement, as well as the optimal dosing parameters for the rehabilitation of Achilles tendon injuries, remain inconclusive. The aim of this study is to compare the immediate effects of two electrical stimulation protocols on pain, functional performance, peripheral oxygen extraction, and maximal tendon displacement during a single leg heel rise functional task in patients with Achilles tendinopathy and/or a history of Achilles tendon rupture. In addition, this study aims to characterize Achilles tendon structural properties and ankle plantarflexor muscle strength in this population.
Eligibility
Inclusion Criteria3
- Primary complaint of pain localized in the midportion (2-6 cm proximal to the calcaneus) or insertion of the Achilles tendon, and/or a history of Achilles tendon rupture occurring at least 3 months prior to assessment.
- Pain on palpation of the Achilles tendon.
- Pain during load-bearing activities
Exclusion Criteria4
- Exclusive diagnosis of bursitis confirmed by ultrasonographic assessment
- Any other lower limb injury
- History of lower limb surgery within the past year
- Previous Achilles tendon tenoplasty performed less than 3 months prior to assessment
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Interventions
Neuromuscular electrical stimulation-induced contractions will be delivered using an electrical stimulator connected to a pair of 5×5 cm self-adhesive surface electrodes. Stimulation will be applied in a superimposed manner during voluntary movement, at a frequency of 75 Hz and a phase duration of 400 µs.
Locations(1)
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NCT07453485