IB Internal Assessment (IA) Biology Higher level (HL) 2026 May Solution & Worked Answer

Assessing the Impact of Genetic Predisposition to Hypertension on Blood Pressure Recovery Following High-Intensity Interval Sprinting

Solution Overview

This investigation explores how genetic predisposition to hypertension influences blood pressure recovery time following a 10-minute high-intensity interval training (HIIT) session. The study compares a hypertensive individual with a normotensive individual, controlling for age, gender, and environmental factors.

Using digital blood pressure monitors, pulse oximeters, and smart rings, the researcher tracked systolic/diastolic blood pressure, SpO2, pulse rate, and heart rate variability. Statistical analysis via t-tests resulted in the acceptance of the null hypothesis, finding no significant difference in mean blood pressure recovery between the subjects.

The exemplar is notable for its rigorous control of variables, detailed evaluation of limitations—including medication interference and measurement error—and comprehensive physiological data collection.

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