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The graph shows the relationship between an athlete's running time and the contribution of three energy systems - HSC - SSCE Personal Development and Physical Education - Question 17 - 2019 - Paper 1
Question 17
The graph shows the relationship between an athlete's running time and the contribution of three energy systems. Which of the following shows the by-product and rat... show full transcript
Worked Solution & Example Answer:The graph shows the relationship between an athlete's running time and the contribution of three energy systems - HSC - SSCE Personal Development and Physical Education - Question 17 - 2019 - Paper 1
Step 1
Which of the following shows the by-product and rate of recovery following exhaustion for the dominant energy system at 50 seconds running time?
Answer
To determine the by-product and rate of recovery, examine the energy system contributions at 50 seconds on the graph. At this time, the anaerobic system is predominantly used, which produces lactic acid as its by-product. The rate of recovery following exhaustion with lactic acid as the by-product is generally noted to be between 30 minutes to 2 hours. Therefore, the correct answer is D: Lactic acid, 30 minutes – 2 hours.