Which model illustrates the body's changing reaction to increased stress over time?

The General Adaptation Syndrome (GAS) Model is a well-established framework that describes the body's response to stress in three stages: alarm, resistance, and exhaustion. This model illustrates how the body initially reacts to a stressor, such as increased physical activity or training, by mobilizing immediate resources in the alarm phase. If the stressor is maintained, the body enters the resistance phase, during which it adapts to the stress, building strength and resilience. However, prolonged exposure to stress without adequate recovery can lead to the exhaustion phase, where the body's resources are depleted, resulting in decreased performance and potential injury.

Understanding the GAS model is crucial for strength and conditioning professionals, as it underscores the importance of managing training loads and allowing adequate recovery to prevent burnout and injuries. This model serves as a guideline for programming and helps trainers monitor athletes' responses to training over time, ensuring that exercise regimens are designed to promote adaptation rather than overwhelm the body's systems.