Clinical justification: why this creates a new measurement domain:
 

Clinically, most objective movement assessment tools answer questions like “How does this patient walk, reach, or stand up in a natural environment?” using motion capture, IMUs, force plates, and dynamometers. These systems are invaluable for describing impairment, but they do not control the mechanical context in which movement occurs; gravity, path choice, and therapist setup all remain major sources of variance. Force Vector 360 defines a new measurement domain by fixing the mechanical context—a reproducible circular path with minimized gravitational bias—and then asking, “How well can this neuromuscular system inhabit a known, repeatable geometry?” That shift turns movement quality into a property that can be tested like a lab instrument: path fidelity, torque smoothness, joint‑coupling behavior, and compensatory strategies become directly comparable across visits, therapists, and facilities. In this domain, the patient is not just performing a task; they are being evaluated against a standardized mechanical challenge, which is something current clinical tools do not provide.
 

Reviewer‑friendly explanation for NIH/NSF

For NIH/NSF reviewers, the key point is that prior tools cannot generate the specific data Force Vector 360 is designed to produce, because they operate in a fundamentally different measurement paradigm.
 

1. Prior tools measure open movement, not constrained movement. Motion‑capture systems, IMUs, and gait labs quantify kinematics and kinetics in natural or guided tasks (walking, reaching, sit‑to‑stand), but the movement path, gravitational loading, and joint‑coupling strategies are free to vary.

2. Isokinetic and robotic systems isolate joints or trajectories, not functional circular paths. Devices like Biodex and lower‑limb rehab robots provide controlled torque or trajectory at specific joints or along predefined linear paths, often for strength or gait training. They do not enforce a closed, single‑plane circular upper‑body movement with gravity‑neutral loading.

3. None of these systems combine mechanical path enforcement with continuous functional‑movement telemetry. Existing platforms either constrain motion (robots, dynamometers) or measure it (motion capture, sensors), but they do not use a fixed circular geometry as both the intervention and the measurement reference, nor do they produce continuous torque, velocity, smoothness, and deviation curves along that path.
    

Force Vector 360 therefore occupies a novel instrumentation space: it is a mechanically constrained, gravity‑neutral functional‑movement platform that generates repeatable neuromechanical telemetry under standardized geometry. The proposed work is not a marginal improvement on existing motion‑capture or rehab robots; it is the creation and validation of a new class of measurement device whose data cannot be obtained from current tools, and which is uniquely suited to reliability testing, protocol development, and future AI‑driven movement modeling.