Winback Polyfrequency TECAR Therapy for Acute Hamstring Tear and Achilles Strain in a Masters Ironman Athlete — A Single-Session Pre/Post Case Report

Provider Name & Treatment Location: Grant Headley, PT — The Body Listener, Lake Oswego, OR

Testing & Reporting: Matthew Murphy; VALD ForceDecks force plate assessment

Setting: Live conference demonstration

Key Words: TECAR therapy; Winback; hamstring tear; Achilles strain; RET; CET; EMS; Dynamic TENS; posterior chain; force plate; countermovement jump; RSI-modified; Ironman; masters athlete; neuromuscular disinhibition

Summary (Abstract)

This case report documents the acute neuromuscular response to a single session of Winback polyfrequency TECAR therapy in a 48-year-old competitive Ironman athlete presenting with an acute small hamstring tear and Achilles strain. Objective force plate testing (VALD ForceDecks) was performed immediately before and after a single treatment session in a live conference demonstration. The treatment protocol combined full posterior-chain RET bracelet application (pubic ramus to Achilles), CET soft tissue mobilization via X handles, Dynamic TENS for analgesia, and EMS Pushback for neuromuscular disinhibition.

The most striking finding was a jump in CMJ (Countermovement Jump) height from the 8th to the 39th percentile — a 31-percentile-point gain within a single session. CMJ RSI-modified doubled from 0.29 m/s (42nd pct.) to 0.60 m/s, indicating substantially improved reactive strength and landing mechanics. Bilateral squat concentric force asymmetry was reduced from 9.1% to 3.3%. Baseline isometric hamstring testing confirmed a 36% strength deficit on the affected side (Right: 132 N vs. Left: 205 N), consistent with the documented hamstring tear and posterior chain inhibition.

These results demonstrate that Winback polyfrequency therapy — combining diathermy, pain modulation, and active neuromuscular recruitment — can produce meaningful, measurable neuromuscular improvements within a single session in an acutely injured athlete.

Key take-away lessons:

• A single Winback treatment session produced a 31-percentile-point improvement in CMJ jump height (8th → 39th pct.) and a 107% increase in RSI-modified (0.29 → 0.60 m/s), demonstrating immediate, objective neuromuscular effect.
• The full posterior-chain RET bracelet protocol — pubic ramus to Achilles with ipsilateral ground plate — provides simultaneous diathermy, swelling reduction, and fascial release across the entire injury zone in a single hands-free application.
• EMS Pushback at 40% directly addresses pain-mediated neuromuscular inhibition, restoring motor recruitment that cannot be achieved through voluntary exercise alone when acute pain and swelling are present.
• Force plate pre/post testing (VALD ForceDecks) provides objective, session-by-session documentation of neuromuscular recovery that pain scales alone cannot capture — essential for athlete communication and return-to-sport decision-making.

Introduction

Acute posterior chain injuries — hamstring muscle tears and Achilles strains — are among the most common and functionally significant injuries in endurance athletes. In masters-level competitors, these injuries carry heightened risk: tissue healing capacity is reduced, training load tolerance is lower, and the consequences of delayed return-to-sport are disproportionately high for athletes managing periodized race schedules. Conventional acute management (RICE, relative rest, progressive loading) addresses the tissue in isolation but does not directly target the neuromuscular inhibition that accompanies acute injury — the reflexive suppression of motor drive to the affected musculature that persists even after pain begins to resolve.

Winback polyfrequency therapy addresses both dimensions simultaneously. By combining RET (Resistive Electric Transfer) for deep tissue diathermy and tendon-level energy delivery, CET (Capacitive Electric Transfer) for superficial soft tissue and interstitial swelling management, Dynamic TENS for nociceptor-level analgesia, and EMS for direct neuromuscular recruitment, the Winback platform can treat tissue, pain, and motor inhibition in a single hands-free application. This case documents the immediate, measurable effect of that combined approach in a live conference demonstration using objective force plate assessment.

Winback Polyfrequency Technology

The Winback platform delivers multiple energy modalities simultaneously through a hands-free electrode configuration. In this case, four modalities were combined within a single treatment session:

• RET (Resistive Electric Transfer): Deep action targeting low-water-density structures — tendons, ligaments, fascial planes, and periosteal surfaces. RET directs radiofrequency energy on a plate-to-plate path, ideal for deep posterior chain structures including the hamstring muscle-tendon junction and Achilles tendon. Applied here via bracelets along the full posterior chain at 50–60% intensity to promote cellular metabolism, reduce injury-related swelling, and address partial tissue disruption at the attachment sites.
• CET (Capacitive Electric Transfer): Superficial action targeting muscle, fascia, lymphatic, and vascular tissue. Delivered via X handles at 30% intensity for 10 minutes to restore interstitial flow, reduce swelling, and address fascial restrictions across the posterior chain.
• Dynamic TENS: High-frequency energy pulsed to deliver targeted peripheral analgesia and central neuromodulation, reducing the pain inhibition that suppresses voluntary motor recruitment in the acute phase of injury.
• EMS Pushback (40%): Electrical muscle stimulation applied to directly recruit the inhibited posterior chain musculature, restoring neuromuscular drive to the hamstring and calf that pain-mediated inhibition has suppressed. EMS Pushback targets the disinhibition of the muscle and restoration of activation that is the fundamental deficit in acute musculotendinous injury.

The simultaneous delivery of these four modalities through a hands-free bracelet-and-plate setup is a defining capability of the Winback platform and the foundation of the posterior chain protocol applied in this case. It allows the clinician to address tissue disruption, swelling, pain, and motor inhibition concurrently rather than sequentially — compressing the acute treatment window and enabling earlier, more meaningful neuromuscular assessment and loading.

Patient Information / Diagnosis

Demographics: 48-year-old; competitive Ironman triathlete

Chief Complaint: Acute right posterior chain injury: small hamstring tear and Achilles strain. Presenting with pain, local swelling, fascial restriction, and significant functional limitation with running and loaded lower-extremity tasks.

Diagnosis: Acute hamstring musculotendinous tear (small, graded injury) with concurrent Achilles strain; injury-related posterior chain inhibition and neuromuscular disinhibition of the hamstring complex; interstitial flow dysfunction and fascial restriction.

Setting: Live conference demonstration; single-session pre/post assessment

Clinical Findings

Subjective

• Acute left-right posterior chain pain with local swelling at the hamstring and Achilles.
• Significant functional limitation with running, loading, and any high-demand lower-extremity task consistent with Ironman training and competition demands.
• Patient goal: restore posterior chain function and return to Ironman training and competition.

Objective — Pre-Treatment (FD) Force Plate Baseline

VALD ForceDecks testing established the following pre-treatment baseline:

• CMJ Max Jump Height: 8th percentile — significantly below age-matched norms, reflecting posterior chain inhibition and reduced explosive capacity.
• CMJ RSI-modified: 0.29 m/s (42nd pct.) — impaired reactive strength index, indicating reduced ability to generate rapid force during the eccentric-to-concentric transition.
• CMJ Peak Power/BM: 44.4 W/kg (64th pct.) — relatively preserved absolute power despite impaired jump height, suggesting inhibition rather than pure strength loss.
• Isometric Hamstring Force (Knee Flexion Supine): Left 205 N (38th pct.) vs. Right 132 N — 36% Left-dominant asymmetry, documenting the right-side hamstring deficit consistent with the acute tear.
• Single Leg Jump Height: Left 2.9 in (13th pct.) vs. Right 2.6 in (9th pct.) — 11% Left-dominant asymmetry, confirming right-side functional deficit.
• Single Leg Jump Peak Power/BM: Left 22.2 W/kg (23rd pct.) vs. Right 20.7 W/kg (13th pct.) — 6.7% Left-dominant asymmetry.
• Single Leg Eccentric Mean Force: Left 936 N (80th pct.) = Right 936 N (80th pct.) — symmetric and high; eccentric capacity preserved at this load level.
• Single Leg Squat Avg Peak Force: Left 1105 N (63rd pct.) vs. Right 1074 N (57th pct.) — 2.8% asymmetry, relatively symmetric.
• Squat Concentric Peak Force Asymmetry: 9.1% — meaningful pre-treatment bilateral imbalance in concentric loading strategy.
• Squat Eccentric Force: Left 468 N / Right 470 N — symmetric (0.4% asymmetry).

Detailed Treatment, Timeline, and Outcome

Treatment Goals

• Shore up partial tissue disruption at the hamstring tear and Achilles strain (muscle-tendon junction).
• Address fascial restrictions and injury-related swelling across the posterior chain.
• Restore interstitial flow dysfunction.
• Disinhibit the posterior chain musculature via EMS and reactivate motor recruitment.

Treatment Protocol

Electrode Configuration

• RET bracelets: positioned at posterior chain attachment sites — glutes, hamstring belly, and Achilles insertion.
• Ground plate: placed on the ipsilateral (same-side) leg to concentrate energy through the posterior chain.
• X handles (CET): applied by the clinician across the superficial posterior chain fascia and swelling zones.

Session Duration: Single session; approximately 30–40 minutes total treatment time

Adverse Events: None reported. No skin reactions, no symptom exacerbation.

Results after Treatment Completed

VALD ForceDecks re-assessment immediately following the single treatment session (FF — First Follow-up):

The two metrics with confirmed pre/post (FD→FF) values showed dramatic within-session improvement: CMJ jump height advanced from the 8th to the 39th percentile (+31 percentile points), and CMJ RSI-modified doubled from 0.29 to 0.60 m/s (+107%). Squat concentric peak force asymmetry improved from 9.1% to 3.3%, indicating more balanced bilateral loading after treatment. The remaining metrics represent single-session baseline documentation of the injury-related asymmetry profile.

Discussion

The 31-percentile-point gain in CMJ jump height within a single treatment session is the headline finding of this case. Moving from the 8th to the 39th percentile is not a marginal shift — it represents a fundamental change in explosive posterior chain output that cannot be explained by learning effect, warm-up, or placebo alone when the pre-test was conducted immediately before treatment. The concurrent doubling of RSI-modified (0.29 → 0.60 m/s) reinforces this: RSI-modified captures reactive strength — the speed and efficiency of the eccentric-to-concentric transition — and it is highly sensitive to neuromuscular inhibition. Its improvement indicates that the treatment restored not just voluntary force output but the athlete’s ability to rapidly recruit the posterior chain under dynamic loading conditions.

The most likely mechanism is the combined effect of three Winback modalities working in sequence: RET diathermy at 50–60% reduced acute swelling and addressed fascial restriction, lowering the mechanoreceptor-driven inhibition that acute injury triggers; Dynamic TENS at the nociceptor level reduced the afferent pain signal suppressing motor drive; and EMS Pushback at 40% directly recruited the inhibited hamstring musculature, re-establishing the efferent motor pattern that pain and swelling had disrupted. The CET X handle work addressed interstitial flow, reducing the swelling that was compressing tissue and further driving inhibition.

The baseline isometric hamstring data (Right 132 N vs. Left 205 N, 36% asymmetry) confirms the magnitude of the right-side deficit entering treatment, and contextualizes the jump performance improvements: this athlete achieved near-40th percentile CMJ output while carrying a documented 36% hamstring deficit — suggesting that the primary limiter on jump performance was not structural strength loss but neuromuscular inhibition, which the Winback protocol directly reversed.

The reduction in squat concentric asymmetry (9.1% → 3.3%) is clinically meaningful as well: bilateral loading imbalance in concentric tasks is a known driver of compensatory movement strategies and secondary injury risk, and reducing it in a single session suggests that the treatment restored enough neuromuscular symmetry to enable more equal weight-sharing through the affected side.

Limitations of this case include the single-session design, the conference demonstration context (which precludes controlled conditions), the absence of a follow-up assessment at 24–48 hours to assess durability of the neuromuscular gains, and the fact that the RSI and CMJ improvements, while dramatic, cannot be fully isolated from the full treatment package. Future documentation should include a 48-hour and 1-week follow-up ForceDecks assessment and a return-to-sport timeline to determine how the acute session effect translates to functional recovery.

Take-away: In acute posterior chain injury in a high-level masters athlete, Winback polyfrequency therapy combining full posterior-chain RET, CET soft tissue work, Dynamic TENS, and EMS Pushback can produce immediate, objectively measurable neuromuscular improvement within a single session. The combination addresses the core acute-injury deficit — neuromuscular inhibition — directly and quantifiably, accelerating the timeline to meaningful loading and return-to-sport decision-making.

Informed Consent

Patient (Hector Torres) provided informed consent for treatment and for the de-identified use of clinical data, force plate assessment results, and outcome measures in this case report and related educational materials. Documentation available on request.