An interventional study of 448 kHz capacitive resistive monopolar radiofrequency in Achilles Tendon Injury and Achilles Tendon, sponsored by University of Malaga. Not yet recruiting at 1 site in Spain. Open to participants aged 18 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-06-17.
Sponsored by University of Malaga · Not applicable, Interventional, and Health services research
448 kHz capacitive-resistive monopolar radiofrequency is an emerging physiotherapy technique whose usefulness and clinical relevance still need to be investigated. This study is a pre-post quasi-experimental study in which several variables will be measured before and immediately after 448 kHz capacitive resistive monopolar radiofrequency. It aims to analyze the morphological and mechanical changes in the Achilles tendon following the intervention in healthy runners.
The Achilles tendon is fundamental to running biomechanics, and its performance directly affects athletic performance and injury prevention. 448 kHz capacitive resistive monopolar radiofrequency has demonstrated effects on vascularization, recovery, and elasticity of musculoskeletal tissues. However, there are no studies that comprehensively evaluate the morphological, mechanical, and functional changes in the Achilles tendón in healthy runners after the application of this technique. The investigators expect the intervention to induce short-term morphological and mechanical changes in the Achilles tendon, providing further insight into the potential of this technique as a preventive tool.
100 studies on the registry are indexed under Tendon Injuries; 27 are open to participants now.
This study's planned enrollment of 19 is below the median of 44 across 70 interventional studies indexed under Tendon Injuries.
Browse Tendon Injuries studies →University of Malaga is the lead sponsor of 121 studies on the registry; 34 are open to participants now.
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Exclusion Criteria:
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Monopolar capacitive-resistive radiofrequency (CRMR) at 448 kHz. Applied with the objective of hyperthermia (thermal effect).
Device: 448 kHz capacitive resistive monopolar radiofrequency
The procedure will consist of a 20-minute radiofrequency session on the Achilles tendon, applying 10 minutes in capacitive mode and 10 minutes in resistive mode. The device has a maximum peak power of 200 W and 450 V. Both modes will be administered as a hyperthermia dose, adjusted according to the patient's subjective perception of heat, with a target of 8/10. The application will be performed longitudinally on the Achilles tendon, from proximal to distal and from distal to proximal, measuring the variables before and after the procedure. In resistive mode, continuous wave will be used, and the return electrode will be a plate placed under the patient's abdomen. The entire procedure will be carried out following the manufacturer's instructions.
Achilles tendon thickness (mm) measured by B-mode ultrasound
The Achilles tendon will be assessed with the participant in a prone position, legs extended and feet resting over the edge of the examination couch. Ultrasound images will be acquired using a linear transducer in the long axis of the tendon, at the level of the medial malleolus, in order to reduce bone-related artefacts. B-mode ultrasound will be used for the evaluation.
Time frame: 1 hour
Elastography in Achilles tendon
Tendon stiffness and elasticity were assessed using compression elastography. Color-coded elastographic maps and quantitative tissue deformation values were obtained following standardized procedures previously described in the literature. Measurements were performed at the same procedure used for measuring tendon thickness.
Time frame: 1 hour
Plantar flexion strength
It will be assessed using an electronic isometric dynamometer, recording the maximum force generated during a voluntary plantar flexion contraction against fixed resistance, maintaining a standardized ankle position and performing several attempts to obtain a reliable value.
Time frame: 1 hour
Functionality of the lower limb
It will be evaluated using the Multijump Rebound Test, a validated test that analyzes the capacity for repeated jumping and the efficiency of the stretch-shortening cycle, allowing the functional changes to be related to the morphological and mechanical properties of the muscle-tendon system.
Time frame: 1 hour
Plan to share: Undecided — Initially, individual participant data are not planned to be shared. However, data sharing may be considered if a formal collaboration agreement is proposed by another research group working on the same topic, provided that the request is scientifically justified and ethically appropriate. In such cases, all necessary protocols and safeguards will be implemented to ensure data anonymisation, confidentiality, and compliance with applicable data protection regulations.
No publications or documents are linked to this record.
Start is estimated for Jul 2026; primary completion for Jul 2026, 0 months later.
Of 36 non-industry interventional studies with no phase under Tendon Injuries, half reached primary completion within 13 months of starting (the median), counting those still running; a quarter within 7 and three quarters within 36. This study's planned 0 months is below that.
Counting every sponsor, half of 38 studies reached it within 14 months; a quarter within 7 and three quarters within 36.
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This study is not yet recruiting, as verified in Jun 2026. You cannot join it, but the record below documents what was studied.
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