# Study 000G Plain-Language Summary

Study `000G` tests whether cadence behaves like the more protected running control variable in this altered-mechanics archive, while stride behaves like the more sacrificial expression variable.

The data supports that model. In the later specialized outside-context probes, cadence stayed above treadmill-expected values in every case while stride stayed below expected values in every case. But cadence preservation did not automatically keep burden low. The October 2025 outside-envelope cluster kept the same protected-cadence pattern while still showing strongly positive HR residual burden. The April 2026 boundary probe showed the same mechanical pattern with much lower burden, which means cadence protection alone is not the whole story. Envelope support appears to matter.