The line of pull can be adjusted to target specific movement patterns by changing mount height, patient position, and cable angle — more versatile than fixed-path leg extension or leg curl machines.

Momentum is eliminated. VOLTRA I's direct drive motor delivers constant resistance without the ballistic component of free weights, reducing re-injury risk during early-to-mid stage rehab.

The 1 lb increments allow precise progressive loading that matches tissue healing timelines more closely than the 5–10 lb jumps typical of weight machines.

Data tracking provides objective documentation of load, volume, and progression for clinical notes and communication with referrers.

Isometric quad sets with measurable force output (Isometric Mode) to track early quadriceps activation and compare bilateral symmetry.

Concentric-only knee extension (Weight Training Mode with Concentric-Only enabled) to begin loading without eccentric stress.

Isokinetic knee extension at slow speeds (0.1–0.2 m/s) for controlled, through-range loading.

Progressive isotonic loading in Weight Training Mode with matched concentric/eccentric resistance.

Introduce eccentric overload at +10–15% as quad strength and tissue tolerance improve.

Isokinetic speed progression (0.3–0.5 m/s) to reintroduce moderate-speed movement patterns.

Regular isometric testing to track LSI (Limb Symmetry Index) progression. Document peak force bilaterally.

Eccentric overload at higher percentages (+20–40%) for deceleration capacity.

Damper Mode for velocity-dependent loading that trains reactive braking.

Isokinetic testing at faster speeds (0.6–1.0 m/s) to assess force production at sport-relevant velocities.

Isometric strength benchmarking as one component of return-to-sport criteria (LSI ≥ 90%).

Use Weight Training Mode for pain-free range strengthening, starting at low loads and progressing based on symptoms.

Isometric holds at specific knee angles (e.g., 30°, 60°, 90°) to load the quads without full-range compression if needed.

The Resistance Band Mode can provide accommodating resistance that reduces load at end-range flexion where patellofemoral compression is highest.

Eccentric calf loading is a cornerstone of Achilles tendinopathy management. Use the eccentric overload setting for precise dosing.

The Travel Platform provides a stable floor anchor for standing calf exercises. Mount at low position, face away, and perform heel raises against cable resistance.

Progress from concentric-only → matched concentric/eccentric → eccentric overload as the tendon tolerates.

Mount at various heights for hip flexion, extension, abduction, and adduction exercises against cable resistance.

Ankle strap attachment allows specific targeting of hip musculature without the compensatory patterns that bodyweight exercises often permit.

Isokinetic Mode at controlled speeds is useful for post-hip arthroscopy patients where movement speed needs to be constrained.

Document mount height, patient position, mode, speed (if isokinetic), and load for every session. Reproducibility is critical for tracking progression.

Use the Auto Load feature for patients who struggle to get into loaded positions safely.

Export session data via CSV for integration into clinical notes. The data includes timestamps, loads, reps, and force metrics.

For patients training unsupervised (e.g., home users with VOLTRA I), the Assist Mode and Slip Detection provide passive safety margins.

VOLTRA I for Practitioners

Isometric Testing & Benchmarking

Isokinetic Protocols for Rehabilitation

Eccentric Loading Protocols