Supra-Additive Load Index (SALI)

Measuring how combined movements create additional performance cost beyond isolated exercise.

The Supra-Additive Load Index (SALI) measures how combined physical tasks interact to produce fatigue, coordination cost, or performance degradation beyond what would be expected from each task individually.

In real-world environments, people rarely perform movements in isolation. Work, sport, and daily life require sequences of actions where the interaction between movements creates additional load. SALI is designed to capture and quantify this interaction effect.

Why SALI Matters

Most physical performance systems assume that multiple tasks simply add together. SALI measures when combined movement creates disproportionate fatigue, revealing interaction effects that traditional benchmarks often miss.

Traditional Assumption

Multiple tasks are treated as additive workloads.

SALI Reality

Movement combinations often create nonlinear fatigue and coordination cost.

Baseline vs Combined Performance

SALI evaluates performance by comparing isolated task output with performance after movement combinations.

Baseline Performance

A task is performed in isolation under normal conditions.

Example:

300-meter run

Combined Performance

The same task is performed immediately after additional movements.

Example:

30 Pushups

30 Squats

30 Plank Leg Lifts

300-meter run

Core Functions of SALI

SALI provides a structured framework for understanding how compound workloads affect human performance beyond isolated exercise metrics.

Measuring Interaction Effects

Two manageable movements may create disproportionate fatigue when combined.

Quantifying Real-World Workload

SALI reflects physical demands found in work, sport, and operational environments.

Creating Comparable Fatigue Profiles

Normalized scoring reveals differences in fatigue handling across participants.

From Isolated Performance to Workload Intelligence

SALI reveals how people respond to compound workloads, making fatigue interaction measurable across environments and populations.

By structuring these measurements and normalizing the results, SALI allows researchers and participants to compare how individuals handle compound workloads across locations,environments, and populations.

This makes it possible to study fatigue interaction, training adaptations, and real-world work capacity in a consistent and scalable way.

4,260

Combined Tests

980

Participants

Movement Sets

Test Regions

Whether you’re exploring interoperability, dataset valuation, AI readiness, or ecosystem participation, we welcome conversations with researchers, organizations, and strategic partners interested in the future of structured data systems.

info@datauniversa.com

Frequently Asked Questions

The Supra-Additive Load Index (SALI) is a DataUniversa framework designed to measure how combinations of physical tasks affect performance. Traditional systems often evaluate exercises in isolation, but SALI examines what happens when movements are performed together. It captures the additional fatigue, coordination demands, and performance costs that emerge from compound workloads.

Real-world work, sport, and daily activities rarely occur as isolated tasks. A person may be required to lift, carry, climb, run, and make decisions in sequence. While each activity may be manageable on its own, the combination can create performance degradation that is not visible in single-exercise testing. SALI helps identify and quantify these interaction effects, providing a more realistic view of workload capacity.

SALI expands DataUniversa's movement intelligence capabilities beyond simple performance measurement. By creating structured records of compound workload response, SALI enables comparisons across participants, environments, occupations, and populations. This helps researchers, organizations, and decision-makers better understand fatigue, resilience, work capacity, and human performance under real-world conditions rather than idealized testing scenarios.