If you have ever stared at a blank document titled “IA Draft” and felt your brain quietly power down, you are not alone. The hardest part of IB SEHS is rarely the science. It is choosing an investigation that is doable, ethical, measurable, and still interesting enough that you do not hate it by week three.
This guide gives you 10 IB SEHS IA ideas that feel like real questions people argue about in gyms, on teams, and in everyday life. Each one is built to be syllabus-aligned, easy to test with school-level equipment, and structured so you can score well on research design, data analysis, conclusions, and evaluation.
A quick checklist before you pick an IB SEHS IA idea
Before you commit, run your research question through this mini filter:
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One clear independent variable (with 2-3 levels max)
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One measurable dependent variable (time, distance, heart rate, jump height, etc.)
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Controls you can realistically hold constant (surface, warm-up, rest, time of day)
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Enough data for analysis (repeats + a decent sample size)
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Safe + ethical participation with informed consent
When you are ready to build the theory section, start from the IB SEHS hub and connect your idea to syllabus language: IB Sports, exercise and health science Resources.
Top 10 IB SEHS IA ideas that are actually interesting
Caffeine and reaction time in young adults
Why it scores well: It is simple to measure, and your evaluation can be strong because placebo effect and tolerance are real limitations.
IB SEHS link: Neuromuscular function, fatigue, and performance.
RevisionDojo angle: Use topic notes to justify mechanisms, then practice writing conclusion-style statements with exam wording in the Questionbank.
Heart rate recovery: trained vs untrained
Why it scores well: Clear grouping variable, very clean dependent variable, and strong links to cardiovascular adaptations.
IB SEHS link: Training effects, aerobic fitness indicators.
Practical tip: standardize the same protocol (step test, shuttle-style effort, or cycling) and control rest posture during recovery.
Music tempo and sprint speed
Why it scores well: It blends psychology and performance, but still stays measurable.
IB SEHS link: Arousal, attention, and performance.
To build stronger theory connections, skim psychology concepts you can borrow for your write-up: Psychology of Sport.
Static vs dynamic warm-up and vertical jump
Why it scores well: Tight methods section, easy repeats, and very visible graphs (means + error bars).
IB SEHS link: Flexibility, muscle elasticity, neuromuscular readiness.
Evaluation win: talk about familiarization trials (jump technique improves with practice).
Sleep restriction and reaction time
Why it scores well: Big real-world relevance, strong discussion potential, and clear ethical considerations.
IB SEHS link: Fatigue, CNS alertness, performance.
Keep it ethical: do not encourage extreme deprivation. Compare something realistic (normal sleep vs slightly reduced sleep) with consent.
Dominant vs non-dominant hand grip strength
Why it scores well: High reliability, low risk, and easy control of variables.
IB SEHS link: Muscle function, strength testing, reliability.
Stats tip: repeats matter here. Averages and standard deviation make your analysis feel serious.
Five-minute meditation and resting heart rate
Why it scores well: Clear independent variable (meditation vs control condition), plus a thoughtful evaluation on environment and expectation effects.
IB SEHS link: Autonomic nervous system and stress response.
If you want to add a richer justification, connect it to mental skills work like imagery and arousal regulation: Imagery and Visualisation in Sport.
Footwear type and 20m sprint time
Why it scores well: Classic biomechanics with a modern, relatable hook.
IB SEHS link: Friction, force application, stride efficiency.
Control tips: same surface, same warm-up, same start technique, and randomize shoe order.
Gender differences in balance performance
Why it scores well: The method can be simple, but the evaluation and ethics discussion can be excellent.
IB SEHS link: Proprioception, motor control, center of mass.
Important: frame results carefully. Discuss individual variation, training background, and sampling bias.
Arm span and swim time (or throw distance)
Why it scores well: It is a clean relationship study, perfect for correlation analysis.
IB SEHS link: Anthropometrics, levers, biomechanics.
If swimming access is hard, substitute an overarm throw test or rowing erg time. The analysis logic stays the same.
How to turn an IB SEHS IA idea into marks
A good IA is mostly process. Use this workflow:
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Plan and structure with the IB SEHS IA Guide
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Model your method with practical advice from SEHS IA Survival Guide: From Brainstorm to Final Submission
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Analyze properly using the approach in How to Analyze SEHS Data Like a Pro
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Check rubric alignment with the IB SEHS IA Grader
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See what good looks like inside the IB SEHS IA Examples
RevisionDojo also helps beyond the IA: you can lock definitions with Flashcards, test understanding with the Questionbank, unblock writing with AI Chat, and build exam calm with Mock Exams and Predicted Papers.
Conclusion: pick the IB SEHS idea you will still like in week three
The best IB SEHS IA idea is not the most original. It is the one you can run reliably, explain clearly, and evaluate honestly. Choose a question that fits your life, your school equipment, and your time.
When you are ready to turn the idea into a high-mark report, use RevisionDojo as your home base: start with syllabus-aligned Study Notes, pressure-test understanding in the Questionbank, draft with AI Chat support, and polish with Grading tools and the Coursework Library. Your investigation becomes simpler when your workflow is connected, and that is where marks tend to compound.