Stress Response and Physiology

Understanding Stress Response

The stress response refers to internal changes that mobilize the body's resources to deal with a stressor. This response can be explained both physiologically and psychologically.

• Stressor: Any event or situation that triggers a stress response.

• Autonomic Nervous System (ANS): The part of the nervous system that controls involuntary bodily functions and is responsible for the physiological response to stress.

Branches of the Autonomic Nervous System

The ANS consists of two main branches that regulate the body's response to stress:

Example: When faced with a threat, the sympathetic branch activates the fight-or-flight response, while the parasympathetic branch helps the body recover once the threat is gone.

The General Adaptation Syndrome (GAS)

Phases of Stress Response

The General Adaptation Syndrome (GAS), proposed by Hans Selye, describes the body's physiological response to stressors in three distinct phases:

Example: If you narrowly avoid a car accident, your body first enters the alarm phase, then adapts in the resistance phase, and may experience exhaustion if stress continues.

Transactional Model of Stress and Coping

Stages of Stress Appraisal and Coping

The Transactional Model explains how individuals assess and respond to stressors through a series of cognitive steps:

1. Primary Appraisal: Evaluating the significance of the stressor (Is it a threat?).

2. Secondary Appraisal: Assessing available resources and options for coping.

3. Coping: Implementing strategies to manage the stressor.

4. Reappraisal: Reflecting on the effectiveness of coping strategies and adjusting as needed.

Example: After a car breakdown, you first assess the threat (primary appraisal), consider your options (secondary appraisal), take action (coping), and later evaluate your response (reappraisal).

Factors Affecting Stress Response

Individual Differences in Appraisal

An individual's response to stress is influenced by:

• Available resources: Skills, support systems, and coping mechanisms.

• Self-efficacy: Belief in one's ability to manage stress.

Example: Someone confident in public speaking may appraise a presentation as less stressful than someone with little experience.

The Yerkes-Dodson Law of Arousal

Relationship Between Stress and Performance

The Yerkes-Dodson Law describes how performance varies with arousal (or stress) level:

• Performance increases with arousal up to an optimal point.

• Too little or too much stress can decrease performance.

Equation:

Example: Moderate stress before an exam can enhance focus and performance, while excessive stress may impair concentration.

Summary Table: Models of Stress Response

Additional info: These models are foundational for understanding how stress affects health and well-being, and are directly relevant to Personal Health studies.