# Graph Unit 9 Lab Report

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a.
Graph 1 shows the time (in seconds) it took subjects 1 and 2 to sprint 100 metres as the sprints increased. Graph 2 shows the immediate heart rate (in beats per minute) of both subjects after they finish each sprint. Graph 3 shows graph 2 including resting heart rates.

b.
Subject 1
• Female
• 16 years old
• Maximum heart rate: 204
• Exercise: 5-6 days/week
• Resting heart rate: 67

Subject 2
• Female
• 17 years old
• Maximum heart rate: 203
• Exercise: 3 days/week
• Resting heart rate: 85

For most sprints, subject 1 had a faster time than subject 2, and had a lower heart rate for all sprints. Sprint 1 was both subjects’ fastest and when their heart rates were lowest. Subject 1 had a 28% time decrease from sprint 1 to sprint 8, and subject 2 had a 29% decrease. Subject 1 reached a steady state heart rate, while subject 2’s heart rate continued to increase. Subject 1’s slowest sprint was at sprint 6, and highest heart rate at sprint 7. Subject 2’s slowest sprint was at sprint 8 and highest heart rate at sprint 8. After sprint 1, subject 1 performed at 86% of their maximum heart rate. Subject 2 performed at 95-97.5% of their maximum heart rate for all sprints.

2. Discussion

a.
Sources of Error
Possible sources of error in this practical would include:
This energy system resynthesises ATP quickly and powerfully for 10-30 seconds at 85-95% of the maximum heart rate. It is the energy system predominant during repeated efforts (Live It Up Chapter 3 & Energy Systems 2015). It can only operate for a short period as it results in muscle fatiguing by-products. This was evident for subject 1, as their results from sprints 2-8 showed that they were working within the 85-95% MHR anaerobic glycolysis range. The anaerobic glycolysis system would also have been predominant for subject 2, as the sprints were

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