Multi-Sling Athlete Measurement: Seeing More of the Movement Response

Multi-Sling Athlete Measurement: Seeing More of the Movement Response

Sport rarely happens at one point on the body. A cut involves trunk rotation over a planted foot. A throw travels from the ground through the shoulder. A sprint loads one limb, then the other. A single measurement surface records a part of that picture — a useful part, but a part. Where multiple I AM 900 Sensor Slings are used during the same defined task, relevant physical measurements can be recorded at different Sling locations, which widens what the recorded response shows.

One Sling Records One Surface. The Task Involves More.

A single Sling configuration answers a single-location question well: what is the recorded response at this measurement location during this task? Multi-Sling measurement exists because real sporting tasks distribute themselves across the body — and because the questions a practitioner asks often do too.

How Multi-Sling Measurement Works

Two or more Sensor Slings are configured at different relevant locations for the same defined task, and the task is performed under the same conditions as the baseline. Each Sling records its own supported physical measurements at its own measurement locations. The recordings are tied to the same task, in the same session, so they can be read together.

Proximal and Distal Locations

Where the instrument configuration places them, Sling locations can sit closer to the trunk (proximal) or further from it (distal) for the same task. This is a configuration choice about where measurements are recorded — it is not a claim that the measurement reads a kinetic chain as a biological structure. The recordings describe what was measured at those locations, nothing more.

What Can Be Recorded Across Locations

Pressure, Pressure Distribution and Sensor-Zone Response

Each Sling records distributed pressure at its measurement locations, how that pressure is distributed across its relevant sensor locations, and the differences and changes its sensor zones record as the task progresses.

Angle, Orientation and Speed (Rate of Change)

Orientation information supported by each sensor configuration — and, where supported, the rate at which a recorded variable changes. In tasks defined by how quickly positions change, rate of change is often as informative as the position itself.

Timing and Sequence

When measurable events occur, and the order in which they occur — now recorded at multiple locations for the same task. This is where multi-Sling measurement earns its place: a sequence recorded at one location can be compared with a sequence recorded at another, in the same task, at the same time.

Repeatability

How consistently each measured response appears across comparable trials — per location, and across the task as configured. Movement variability and repeatability are established concerns in human-movement measurement (Stergiou & Decker. Human movement variability, nonlinear dynamics, and pathology: is there a connection? Human Movement Science, 2011; Atkinson & Nevill. Statistical methods for assessing measurement error in variables relevant to sports medicine. Sports Medicine, 1998). Repeatability is treated here as a measured variable, not an assumption.

Relationships Between Recorded Measurements

With several locations recording the same task, the relationships between the recorded measurements become visible — whether timing at one location leads or follows another, whether repeatability differs between locations. These relationships are observations about the recorded data. They are not: a proprietary combined score (none exists), a claim about which ligament is causing a problem, or a direct reading of a biological chain. Where the pressure mat is also used for the same task, it adds ground/contact pressure and loading information — a different measurement from the Sling's, never merged into one number. See Sensor Sling vs Pressure Mat.

Where It Fits: Baseline, Calibration, Retest

Multi-Sling measurement runs on the same backbone as every I AM 900 assessment: establish the athlete baseline, measure the defined task, apply the practitioner-directed calibration (what calibration means), retest the same task, and compare what changed. The framework is on the method page, the process at /calibrate, the sport pathway at /sport, and the instrument itself at I AM 900 Sensor Sling. For what to measure in sport, see What Should You Measure in Sport?