# Study 000E Abstract

This study asked whether session-level burden rises when the altered-mechanics running system is pushed outside its narrowed successful context.

The narrowed successful context was defined as the later stabilized running context established in prior studies. The outside-context probes were the later specialized runs isolated in `Microstudy B`, with outdoor expression serving as the current operational test case.

The results supported a clear answer. The later specialized outside-context probes had a mean HR residual of `12.67 bpm`, compared with `3.09 bpm` in the late narrowed-context window and `-1.60 bpm` in the early window. All `5/5` later outside-context probes showed positive HR residual burden (`p = 0.03125`). Relative to local stabilized matched runs within `+/- 0.10 m/s`, outside-context heart rate was higher on average by `10.50 bpm`, although that local matched comparison was positive in `4/5` cases rather than uniformly positive.

The hybrid-cardio confound remained cleared because the later outdoor probes were `69` to `109` days away from the later hybrid-cardio block identified in `000C`.

The strongest supported conclusion is that `session-level burden rises when the system is forced outside its narrowed successful context`.