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The aim of the experiment is to find the effect of exercise on the heart rate

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Introduction

DESIGN: Aim: The aim of the experiment is to find the effect of exercise on the heart rate Background: 'As a person exercise the heart rate increases because the muscles need more blood, which delivers oxygen and nutrients to them.' Jim Slogan 'The heart rate is increased by the sympathetic nervous system, which is controlled by the medulla oblongata, when a person exercises his carbon dioxide concentration in the blood increases, thus the blood pH increases and the pituitary gland senses the change, causing the sympathetic nervous system to increase heart rate' IB biology book Hypothesis: An increase in exercise will increase the heart rate. ...read more.

Middle

* Water level in blood (the higher the water level the higher its volume, making it easier for blood to reach an organ with fewer bumps) * Stimulant drugs * Hormones Materials: - 1x chair - 1x Handgrip heart monitor - 1x Stopwatch (+/- 0.02) - 1x Laptop with software Logger Light v1.5 installed - 5x Healthy volunteers with same size and age - Microsoft excel used to note the data Method: 1. Find 5 volunteers 2. Assign each volunteer a letter (A, B, C, D, E) ...read more.

Conclusion

DATA COLLECTION AND PROCESSING: Raw data: Students Heart rate before exercise/ bpm Heart rate after exercise/ bpm A 68 133 B 86 150 C 93 178 D 68 145 E 99 145 Processed data: Before exercise After exercise Average 82.8 150.2 Standard deviation 14.27 16.75 Standard error 6.38 7.49 Conclusion and evaluation: Conclusion: The result supports my hypothesis, and agrees with current knowledge, as it can be seen in the processed data the table shows that the average increases from 82.8 to 150.2 with 67.4 beats per minute difference. Evaluation: The results that were produced from the experiment matches with the current knowledge. Source of errors can be the stopwatch or that the volunteers can not be equally motivated. ...read more.

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