Fundamentals · F05

Hormones & Physiology

The endocrine system's role in performance, adaptation, stress response, and long-term capacity.

Core Concept

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How Hormones Actually Govern Performance Capacity

Hormones don't just influence mood — they set the physiological conditions under which performance is possible. This article explains the key hormonal variables that determine how much output your system can sustain over time.

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The Full Picture

11 articles

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Cortisol: What It Does and When It Becomes a Problem

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Testosterone and Training Adaptation: What the Evidence Shows

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HRV as a Performance Signal: How to Read It Correctly

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The Endocrine Response to Training Load

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Why Chronic Stress Degrades Performance Over Time

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Adrenaline and Acute Performance: Short-Term Boost, Long-Term Cost

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Insulin Sensitivity and Energy Availability in Athletes

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How Sleep Deprivation Disrupts Hormonal Balance

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Thyroid Function and Unexplained Fatigue

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The Hormonal Cost of Overtraining

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