Key Studies of Explanations of Stress 🌟

Welcome, students. In Health Psychology, stress is not just “feeling busy” or “being worried.” It is a major factor that can influence physical health, mental well-being, and everyday behavior. This lesson focuses on key studies that explain how stress works, why people respond differently to it, and how psychologists have investigated stress in real-life settings. By the end, you should be able to explain the main ideas, use correct terminology, and connect these studies to the wider Health Psychology topic.

What is stress and why do key studies matter?

Stress can be understood as the body’s and mind’s response to demands that feel challenging or threatening. These demands are often called stressors. A stressor may be external, such as exams, conflict, or money problems, or internal, such as worrying thoughts or fear. Stress matters in psychology because it can affect sleep, concentration, immune functioning, heart health, and decision-making.

Key studies are important because they give evidence for psychological explanations of stress. They help us understand whether stress is caused mainly by the event itself, by how a person interprets the event, or by social and biological factors together. This connects directly to the biopsychosocial perspective, which says health is influenced by interactions among biological, psychological, and social factors.

One major idea in stress research is that stress is not only about the situation but also about appraisal. Appraisal means the way a person evaluates a situation. If a person thinks, “This is dangerous and I cannot cope,” the stress response is likely to be stronger than if they think, “This is difficult, but manageable.” This idea is strongly linked to the work of Richard Lazarus and Susan Folkman.

Lazarus and Folkman: cognitive appraisal and coping 🧠

Lazarus and Folkman are central to explanations of stress because they showed that people do not respond to events in the same way. Their model argues that stress depends on cognitive appraisal. There are two key stages:

• Primary appraisal: the person decides whether the event is irrelevant, positive, or stressful.
• Secondary appraisal: the person evaluates whether they have the resources to cope.

If students is preparing for several important exams, one student may appraise the situation as a challenge and believe they can manage with planning. Another student may appraise it as a threat and feel overwhelmed. The event is similar, but the stress response differs because of appraisal.

Lazarus and Folkman also described coping strategies. Problem-focused coping means trying to deal with the cause of stress, such as making a revision timetable or asking a teacher for help. Emotion-focused coping means trying to manage the emotional response, such as relaxation, talking to a friend, or reinterpreting the situation.

This study is important because it explains why stress is subjective. It also shows that stress is not always harmful. Some stress can motivate people when they feel capable of coping. This is useful in Health Psychology because interventions can teach better coping skills rather than only trying to remove all stressors.

A real-world example is a student athlete injured before a competition. If they believe recovery is possible and they have support, they may use active coping. If they believe the injury is hopeless, stress may increase and recovery behavior may worsen.

Selye: the General Adaptation Syndrome and the body’s stress response 🫀

Hans Selye offered a biological explanation of stress through the General Adaptation Syndrome, often called GAS. This model suggests that the body responds to prolonged stress in three stages:

1. Alarm reaction: the body recognizes the stressor and activates the fight-or-flight response.
2. Resistance: the body tries to adapt and cope while staying alert.
3. Exhaustion: if stress continues too long, the body’s resources are depleted.

Selye’s work is important because it showed that stress has a physical component, not just an emotional one. During the alarm stage, the body releases stress hormones such as adrenaline and cortisol, which prepare the body for action. This can be helpful in short bursts, but long-term activation may damage health.

A useful classroom example is a worker dealing with constant deadlines. At first, the person may feel energized and focused. If the pressure continues for weeks or months, they may enter resistance, where they keep functioning but feel tired. If the stress continues without relief, they may reach exhaustion, leading to burnout, illness, or reduced performance.

Selye’s model helps explain why chronic stress is linked to health problems such as cardiovascular disease and weakened immune functioning. However, it is also limited because it focuses mainly on the body and less on thoughts, emotions, and social context. That is why modern health psychology often combines Selye’s biological ideas with cognitive and social explanations.

Social Readjustment Rating Scale and life events 📋

Another key approach to stress is the Social Readjustment Rating Scale, developed by Thomas Holmes and Richard Rahe. They studied life events and argued that major changes in life require “readjustment,” which can create stress. They created a scale of life events, giving each event a Life Change Unit score. For example, death of a spouse is rated as highly stressful, while minor changes receive lower scores.

The important idea here is that stress can build up when many changes happen close together. A person may not be affected by one event alone, but several events together can increase the likelihood of illness. For example, students might experience moving house, changing schools, and family conflict in the same month. Each event may be manageable separately, but together they create a heavier stress load.

This study is useful because it makes stress measurable and allows researchers to compare life changes across people. It also supports the idea that stress can be linked to illness. However, it has limitations. It assumes that the same event affects everyone in a similar way, but that is not true. The same event can be exciting for one person and devastating for another. That is why appraisal is so important.

In exam answers, it is good to explain that this study reflects a more objective, event-based explanation of stress, while Lazarus and Folkman provide a more subjective, cognitive explanation.

Biopsychosocial connections to stress and health 🔍

Stress is not only psychological. It affects and is affected by the body and the social world. The biopsychosocial perspective is a major way to connect these studies to Health Psychology.

Biological factors include hormone release, immune response, sleep disruption, and blood pressure changes. Psychological factors include appraisal, personality, coping style, and beliefs about control. Social factors include family support, culture, school pressure, and work demands.

For example, a teenager with strong family support may appraise exams as manageable and use problem-focused coping. Another teenager with little support may feel less able to cope, leading to stronger stress responses. These differences show why health outcomes can vary so much between people facing similar stressors.

Stress research is also linked to health promotion and intervention. If stress results from appraisal and coping, then schools can teach time management, relaxation, and cognitive reappraisal. If chronic stress affects health through repeated activation of the stress response, then interventions can focus on reducing long-term exposure and improving recovery.

A very important IB Psychology skill is to connect theory to evidence. For example, if a study finds that social support lowers stress, this supports the idea that coping resources matter. If a study shows that prolonged stress increases illness risk, this supports Selye’s biological explanation. If a study finds that the same life event affects different people differently, this supports Lazarus and Folkman.

How to use key studies in an IB Psychology answer ✍️

When writing about explanations of stress, students should do more than describe a study. Strong answers explain the aim, the key concept, and why the study matters.

A good structure is:

• Identify the study or model.
• Explain the main idea using correct terminology.
• Give a real-world example.
• State one strength or limitation.
• Link it to Health Psychology.

For example, you could write that Lazarus and Folkman explain stress as a result of cognitive appraisal, meaning that stress depends on how a person interprets the event and their coping resources. A strength is that it explains individual differences. A limitation is that appraisal can be difficult to measure directly.

You could also write that Selye’s GAS explains how the body adapts to chronic stress through alarm, resistance, and exhaustion. A strength is that it highlights the biological consequences of prolonged stress. A limitation is that it ignores the role of thinking and social support.

If the question asks for explanation, use clear cause-and-effect language. If the question asks for application, show how the theory fits a scenario. If the question asks for evaluation, compare strengths and weaknesses fairly.

Conclusion ✅

Key studies of explanations of stress show that stress is complex and multi-layered. Lazarus and Folkman emphasized appraisal and coping, Selye explained the body’s physical response to prolonged stress, and Holmes and Rahe showed that major life events can contribute to stress load. Together, these studies help explain why stress affects health, why people differ in their responses, and how interventions can be designed.

For IB Psychology SL, the main goal is not just to memorize names. It is to understand how each study explains stress, how the evidence supports the explanation, and how all of this fits into Health Psychology. students, if you can connect stress to cognition, biology, and social context, you are thinking like a psychologist.

Study Notes

• Stress is the body’s and mind’s response to demands that feel challenging or threatening.
• Lazarus and Folkman explain stress using appraisal and coping.
• Primary appraisal asks whether an event is stressful.
• Secondary appraisal asks whether a person has the resources to cope.
• Problem-focused coping targets the cause of stress.
• Emotion-focused coping targets feelings caused by stress.
• Selye’s General Adaptation Syndrome has three stages: alarm, resistance, and exhaustion.
• Chronic stress can contribute to health problems because of long-term biological activation.
• Holmes and Rahe studied life events and argued that major changes create stress through readjustment.
• Stress research fits the biopsychosocial perspective because biological, psychological, and social factors all matter.
• In IB answers, always link the study to health outcomes, coping, and real-life application.