Exercise and mental health (Biological)

Welcome to Exercise and Mental Health!

In this chapter, we explore one of the most exciting areas of Sport and Exercise Psychology: the link between moving our bodies and feeling better in our minds. While we often think of exercise as something we do for physical fitness, psychologists are fascinated by how it changes our brain chemistry and emotional well-being. We will look at why exercise helps, dive into a fascinating study about dance and Parkinson’s disease, and learn how to design a strategy to help people feel better through movement.

1. Background: The Biological Benefits of Exercise

Why does a brisk walk or a gym session make us feel "lighter" or happier? From a biological perspective, exercise acts like a natural medicine for the brain. Here are the three main ways it works:

Neurotransmitters and Hormones

When we exercise, our body releases "feel-good" chemicals:

• Endorphins: These are the body’s natural painkillers. they create a sense of euphoria, often called a "runner’s high."
• Serotonin: Exercise increases serotonin levels, which helps regulate mood, sleep, and appetite. Low levels of serotonin are often linked to depression.
• Cortisol: This is the "stress hormone." Regular exercise helps the body manage cortisol levels, making us feel less "on edge."

The Anti-Depressant Effect

Research suggests that for mild-to-moderate depression, regular aerobic exercise (like running, swimming, or cycling) can be just as effective as anti-depressant medication or psychotherapy. This is because exercise promotes neuroplasticity—the brain’s ability to repair itself and grow new connections.

Types of Exercise

While all movement is good, psychologists often distinguish between:
1. Aerobic Exercise: High-intensity movement that increases heart rate (e.g., jogging).
2. Anaerobic Exercise: Short bursts of exertion (e.g., weightlifting).
Both have benefits, but aerobic exercise is most strongly linked to reducing anxiety and depression.

Quick Summary: Exercise isn't just about muscles; it's about brain chemistry. It boosts serotonin and endorphins while lowering stress hormones like cortisol.

2. Key Research: Lewis et al. (2014)

The core study for this chapter is by Lewis et al. (2014), which looked at how social dance affects the mood of people with Parkinson’s disease.

The Context

Parkinson’s disease is a biological condition where the brain loses dopamine-producing cells, leading to shaking and difficulty moving. People with Parkinson’s also frequently suffer from depression and anxiety because of the physical toll of the illness.

Aims

The researchers wanted to see if a social dance intervention could improve the mood states of people with Parkinson's over a long period (10 weeks) and after a single session.

Method and Sample

• Participants: \(22\) participants with Parkinson’s disease.
• Design: A quasi-experiment using a repeated measures design (comparing participants' moods before and after the dance sessions).
• The Intervention: Participants took part in weekly social dance classes (like tango or ballroom) for 10 weeks.

Procedure

Researchers used a tool called the POMS (Profile of Mood States). This is a questionnaire that measures six different mood states: Tension-Anxiety, Depression-Dejection, Anger-Hostility, Vigor-Activity, Fatigue-Inertia, and Confusion-Bewilderment.

Results

The findings were very positive:
1. Short-term: After just one \(50\)-minute dance class, participants showed a significant reduction in Anger, Confusion, Fatigue, and Tension.
2. Long-term: Over the \(10\) weeks, the overall mood of the group improved, particularly in terms of reduced Tension and Vigor (feeling more energetic).
3. The researchers also found that the "social" element of the dance—the rhythm and the interaction—seemed to help the brain more than simple repetitive exercises.

Conclusions

Lewis et al. concluded that social dance is a highly effective biological and social tool for improving the mental health of people with physical conditions. It shows that exercise doesn't have to be "boring" to have powerful brain benefits!

Key Takeaway: Lewis et al. (2014) proves that even in clinical populations with brain disorders, movement like dancing can significantly lower negative emotions like anger and tension.

3. Application: An Exercise Strategy to Improve Mental Health

If you were a health psychologist asked to design a program to improve a community's mental health, what would it look like? Based on the biological evidence, your strategy should include:

The "Green Exercise" Strategy

• Type of Activity: Suggest rhythmic aerobic exercise (like brisk walking, dancing, or swimming). This mimics the rhythmic nature of the Lewis et al. study.
• Frequency: Recommend \(30\) minutes, \(3\) to \(5\) times a week. This is the "dosage" often found to be most effective for neurochemical changes.
• Environment: Encourage Green Exercise (exercise outdoors). Research shows that being in nature further reduces cortisol levels compared to a gym.
• Social Element: Include a group setting. As Lewis et al. showed, the social interaction helps reduce the "Depression-Dejection" mood state.
• Intensity: Moderate intensity (enough to get the heart rate up but still be able to talk). This ensures a steady release of endorphins without causing excessive physical stress.

Memory Aid: Remember the "F.I.T.S." acronym for your strategy: Frequency (3-5 times), Intensity (Moderate), Type (Aerobic/Rhythmic), and Social (Group-based).

4. Evaluation: Issues and Debates

When discussing this topic in an exam, you can use these "big picture" ideas to gain extra marks:

Biological Reductionism

Is it just the chemicals? The biological explanation is reductionist because it focuses mostly on endorphins and serotonin. It might ignore cognitive factors (like feeling proud of yourself) or social factors (like making new friends in a dance class).

Nature vs. Nurture

Our nature (biology) dictates how our brain responds to exercise. However, our nurture (upbringing/environment) determines whether we have access to a safe park or a gym to exercise in.

Determinism

This area is somewhat deterministic. It suggests that if you do the exercise, your biology must change and your mood will improve. However, free will plays a huge role—someone suffering from severe depression may find it incredibly difficult to find the motivation to start exercising in the first place.

Usefulness of Research

The research is extremely useful. Unlike expensive drugs with side effects, exercise is free (or cheap) and has "side effects" that are actually good for you, like better heart health!

Quick Review Box

• Biological Cause: Endorphins, Serotonin, and reduced Cortisol.
• Key Study: Lewis et al. (2014) — Social dance improves mood (POMS) in Parkinson's patients.
• Key Result: Significant drop in anger and tension after dance.
• Strategy: Rhythmic, moderate aerobic exercise in a social or outdoor setting.
• Avoid this mistake: Don't just say exercise "makes you happy." Use the technical terms: reduces tension, anxiety, and depression via neurotransmitters.

Note: For more on how biological factors affect sport, see the chapter on "Arousal and anxiety (Biological)".