IB SEHS: Acute vs Chronic Exercise Responses

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Ventilation increases to bring in O_2 and remove CO_2

These responses drop back toward baseline during recovery. If you want a clear system-by-system breakdown, pair this with Short-Term Exercise Responses Explained.

Chronic exercise responses (what changes because you trained)

In IB SEHS, chronic exercise responses are long-term training adaptations caused by repeated sessions over time. They explain why trained performers can work at higher intensities with less fatigue.

High-value chronic examples:

• Lower resting heart rate (often from improved stroke volume)

• Increased stroke volume and stronger cardiac function

• Improved aerobic capacity (VO_2 max) in many untrained individuals after training

• Increased muscular strength or endurance, depending on the training type

If you want to connect adaptations to cardiovascular data, RevisionDojo’s notes on Cardiac Output, Stroke Volume and Heart Rate Data and Cardiovascular Adaptations from Endurance Training are perfect extensions.

The comparison examiners want in IB SEHS

A clean compare/contrast usually sounds like this:

• Acute: heart rate rises during exercise to increase oxygen delivery

• Chronic: resting heart rate lowers after training because stroke volume increases

Notice the language: during, immediately, right after signal acute; after weeks, long-term, as a result of training signal chronic.

To sharpen answer structure, use How to Revise Exercise Responses and, for general exam technique, Structure IB Answers to Maximize Marks.

How RevisionDojo helps you score on IB SEHS response questions

Knowing definitions is step one. Scoring marks is step two.

RevisionDojo helps IB SEHS students turn this topic into reliable points using:

• Study Notes to lock the definitions and mechanisms

• Flashcards to drill acute vs chronic examples until it’s automatic

• AI Chat to fix confusing phrasing and tighten cause--effect chains

• Questionbank for exam-style practice across exercise physiology

• Grading tools to see where your explanation loses marks

• Mock Exams and Predicted Papers to simulate pressure without panic

• Tutors when you want human feedback fast

If you’re building wider context, explore the SEHS subject hub.

Final takeaway: make the time scale obvious

If you remember nothing else, remember this: acute is the body surviving the session; chronic is the body rewriting itself because the sessions keep happening. That single distinction lifts clarity across IB SEHS short answers and longer responses.

When you’re ready to practise it under exam conditions, use RevisionDojo’s Study Notes, Flashcards, AI Chat, and Questionbank to turn acute vs chronic exercise responses into automatic marks.

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