The goal of this clinical trial is to evaluate the impact of various passive post-exercise recovery techniques on professional athletes. The main questions it aims to answer are:

Do passive recovery modalities significantly improve muscle oxygenation and tissue temperature immediately following high-intensity effort?

Which specific technique is most effective in reducing perceived pain, measured by the pressure pain threshold, and restoring muscle strength?

Researchers will compare six different therapeutic interventions-Transfer of Energy Capacitive and Resistive therapy, manual massage, intermittent negative pressure therapy, extracorporeal shockwave therapy, percussion therapy, and pneumatic pressotherapy-to determine which provides a superior immediate physiological and functional recovery effect.

Participants will:

Perform a high-intensity physical effort designed to induce peripheral fatigue.

Be randomly assigned to receive one of the six recovery protocols.

Undergo objective measurements immediately after the intervention, including near-infrared spectroscopy to assess muscle oxygen saturation, tissue thermography, algometry, and dynamometry.

This project is designed as a randomized, double-blind (outcome assessor and statistician), crossover clinical trial. The study aims to address the critical need for evidence-based recovery strategies in high-demand sports such as basketball, where muscle overload is a primary risk factor for injury.The investigation will focus on the immediate physiological and functional effects of six widely utilized physiotherapy modalities:Capacitive and Resistive Energy Transfer (TECAR) Therapy: Utilized to improve tissue perfusion and modulate inflammatory responses through deep endogenous thermotherapy.Percussive Massage Therapy: Applied via mechanical vibration to reduce muscular stiffness and enhance explosive force restoration.Extracorporeal Shockwave Therapy (ESWT): Evaluated for its capacity to enhance muscular microcirculation and accelerate immediate tissue metabolic activity.Intermittent Pneumatic Compression (Pressotherapy): Targeted at reducing perceived pain and the sensation of limb heaviness through mechanical fluid drainage.Intermittent Negative Pressure Therapy (Vacuum Therapy): Investigated for its role in localized blood flow enhancement and pain modulation.Manual Sports Massage: Defined as the traditional manual intervention for reducing perceived muscle soreness and improving soft tissue flexibility.Physiological monitoring will be conducted using Near-Infrared Spectroscopy (NIRS) to measure muscle oxygen saturation ($SmO_2$) and total hemoglobin, providing direct data on muscle oxidative metabolism. Functional outcomes will be assessed through pressure pain thresholds (PPT) via algometry and maximal isometric strength via dynamometry to determine the effectiveness of each technique in restoring neuromuscular homeostasis.The study will be conducted at the Sierra Varona Physiotherapy Clinic (Toledo, Spain) between February and March 2026..

Inclusion Criteria:

Professional or Semi-professional athletes (specifically basketball players or endurance athletes) with a minimum of 2 years of competitive experience.

Aged between 18 and 35 years.

Healthy individuals with no current musculoskeletal injuries in the lower limbs.

Regular training frequency of at least 4-5 sessions per week.

Signed informed consent to participate in the study and follow the 6-week crossover protocol.

Commitment to maintain similar nutritional and sleep habits throughout the duration of the study.

Exclusion Criteria:

Presence of any acute or chronic injury in the gastrocnemius or Achilles tendon in the last 6 months.

Contraindications for specific therapies:

For Shockwave Therapy: Blood clotting disorders or use of anticoagulants.

For TECAR/Diathermy: Metal implants in the lower limbs or pacemakers.

For Cupping: Acute skin infections or dermatological hypersensitivity.

Consumption of performance-enhancing drugs, anti-inflammatory medication (NSAIDs), or stimulants that could affect muscle oxygenation (SmO2) or pain perception.

Recent surgery in the lower extremities (within the last year).

Inability to complete the standardized fatigue protocol or attend all 6 intervention sessions.

"De-identified individual participant data (including muscle oxygenation variables, pressure pain thresholds, and isometric strength values) will be made available upon reasonable request to the principal investigator. Data will be shared to facilitate meta-analyses or to verify the findings of this study, provided that the requesting researcher provides a methodologically sound proposal and signs a data use agreement to ensure athlete confidentiality."

Due to the nature of the physical interventions-such as manual massage, extracorporeal shockwave therapy, and intermittent negative pressure-participants and therapists cannot be blinded to the treatment assignment. To mitigate potential bias, a double-blind approach will be implemented for data collection and statistical analysis.

The Outcome Assessor, responsible for recording measurements from near-infrared spectroscopy, algometry, and dynamometry, will remain blinded to the specific recovery modality administered to the athlete during each period. To maintain this blinding, the assessment will take place in a separate area from the intervention site. Furthermore, the statistical analysis will be conducted by an independent investigator using a coded dataset, ensuring that group allocation remains concealed until the final results are processed.