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Compare TWO different energy systems by exploring their duration, sources of fuel and causes of fatigue - HSC - SSCE Personal Development and Physical Education - Question 25 - 2017 - Paper 1
Question 25
Compare TWO different energy systems by exploring their duration, sources of fuel and causes of fatigue. Use examples to support your answer.
Worked Solution & Example Answer:Compare TWO different energy systems by exploring their duration, sources of fuel and causes of fatigue - HSC - SSCE Personal Development and Physical Education - Question 25 - 2017 - Paper 1
Step 1
ATP/PC Energy System
Answer
The ATP/PC system is an anaerobic energy system that does not require oxygen. It relies primarily on stored ATP and creatine phosphate (PC) for immediate energy. This system is highly efficient for short bursts of activity, lasting approximately 10 to 12 seconds. During high-intensity efforts, such as sprinting or heavy lifting, the energy is quickly replenished as ATP breaks down. However, fatigue sets in rapidly mainly due to the depletion of phosphocreatine stores, which limits the re-synthesis of ATP.
Step 2
Aerobic Energy System
Answer
In contrast, the aerobic energy system requires oxygen and utilizes carbohydrates and fats as fuel, allowing for sustained energy production during longer-duration activities. This system can support exercise at moderate intensities for extended periods (from several minutes to hours). Fatigue in aerobic activities arises from factors such as glycogen depletion and the accumulation of lactic acid, which occurs when intensity exceeds the body's ability to deliver oxygen. For example, long-distance runners rely heavily on the aerobic system to maintain endurance over time.
Step 3
Comparison of Energy Systems
Answer
In summary, the ATP/PC system is optimal for short, explosive movements due to its rapid energy availability but tires quickly, while the aerobic system supports prolonged activities with a slower energy release. Each system has distinct fuel sources and fatigue mechanisms, showcasing their specialized roles in athletic performance.