# Study 000N Manuscript

## Title

`Prospective Envelope-State Markers In A Longitudinal Altered-Biomechanics Archive`

## Background

The archive already supports adaptation under structural constraint, operating-envelope behavior, support-dependent burden separation, and more than one successful low-burden route.

What remained unresolved was whether these findings could be translated into a usable prospective state-reading system.

This matters because retrospective theory is scientifically useful, but forward-usable markers are what turn the theory into an operational framework.

## Objective

To test whether measurable pre-run markers can define envelope state transitions in advance rather than only after burden outcomes are known.

## Methods

This study synthesized completed archive outputs from `000H`, `000I`, `000J`, `000K`, and `000M`.

The study evaluated four evidence families:

1. support-factor candidate strength
2. state-case contrasts
3. outdoor-case pressure tests
4. multi-mode safeguards

The strongest answer was determined by whether the archive supported:

- no marker system
- one universal threshold
- or a mode-sensitive marker family

## Results

### The strongest prospective markers were running-share context and treadmill-neighbor density

The `000H` candidate-factor table showed that:

- running-share context rose from `5.1299%` in the October 2025 cluster to `91.0839%` in the April 2026 low-burden boundary probe
- treadmill-neighbor density rose from `1.75` to `32.0`

These effects were much stronger than recent total activity volume and stronger as advance state markers than downstream performance signatures.

### The same marker family separated the mature low-burden state from both October and early short positive-burden probes

The early short probes on `2025-04-30` and `2025-05-03` showed:

- running-share context near `11%`
- treadmill neighbors of `4`
- positive burden despite earlier phase timing

The October cluster showed even thinner support:

- running-share context between `3.8363%` and `7.1952%`
- treadmill neighbors of `1` to `2`
- positive burden across all cluster cases

The mature April 2026 state showed:

- running-share context of `91.0839%`
- treadmill neighbors of `32`
- low burden

So the marker family prospectively organizes a mature supported state versus a contracted high-risk state.

### One universal threshold failed against the early long-settled low-burden mode

The early `2025-04-16` low-burden outside run occurred with:

- running-share context of `28.2459%`
- treadmill neighbors of `3`
- low burden

This is far below the mature supported-state marker values.

So one fixed threshold cannot explain every successful low-burden state in the archive.

### The best model is a mode-sensitive marker family

The archive is therefore better explained by:

- a marker family that prospectively identifies major state classes

rather than by:

- one single universal readiness score

## Conclusion

The archive supports `prospective envelope-state markers` in constrained form.

The strongest markers are:

- `local running-share context`
- `treadmill-neighbor density`

These markers prospectively distinguish the mature supported boundary-expression state from the contracted high-risk state.

But because the early long-settled low-burden mode remains successful outside that high-support signature, the archive supports a `mode-sensitive marker family` rather than a universal fixed threshold.

This makes `000N` the first study in the program to move the envelope framework toward forward-usable state reading without overclaiming complete prediction.