The calculated MTC at Beginning of Cycle (BOC) was found to be $-3.5 \text pcm/^\circ\textC$.

In the vast digital repositories of 20th-century European history, individual documents often serve as windows into the daily lives of ordinary people. One such document, cataloged as AGES-PH-04-001, is a seemingly mundane piece of bureaucracy: a questionnaire. However, its contents offer a granular, on-the-ground view of German agriculture during one of the most volatile periods in modern history—the twilight of the Weimar Republic and the rise of the Third Reich.

AGES-PH-04-001 was not a simple form. It was a comprehensive audit designed to measure the viability of Germany's food supply. The "Large Farm" questionnaire (distinct from forms for smallholders or cottage industries) asked for detailed data on:

Perhaps the most provocative finding: among the 340 participants who underwent a structured lifestyle intervention (better diet, resistance training, and sleep hygiene) mid-study, 28% showed a decrease in PAO over 3 years. That is, their physiological age regressed by an average of 1.7 years relative to chronological age.

While not a controlled trial, this is powerful real-world evidence that biological aging is not a one-way street.