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Complete the table by identifying the causes of fatigue for the energy systems - HSC - SSCE Personal Development and Physical Education - Question 22 - 2006 - Paper 1
Question 22
Complete the table by identifying the causes of fatigue for the energy systems. Alactacid system ATP/PC Lactic acid system Aerobic system
Worked Solution & Example Answer:Complete the table by identifying the causes of fatigue for the energy systems - HSC - SSCE Personal Development and Physical Education - Question 22 - 2006 - Paper 1
Step 1
Alactacid system
Answer
The main cause of fatigue in the alactacid system, which relies predominantly on ATP and phosphocreatine (PC), is the depletion of phosphocreatine. As these energy stores are limited and deplete quickly during high-intensity, short-duration activities, the lack of available phosphocreatine leads to an inability to regenerate ATP efficiently.
Step 2
Lactic acid system
Answer
Fatigue in the lactic acid system is primarily caused by the accumulation of lactic acid and hydrogen ions in the muscles. During anaerobic activity, as the intensity increases, lactic acid levels rise and lead to a decrease in pH, which can inhibit muscle contraction and lead to the sensation of fatigue and discomfort.
Step 3
Aerobic system
Answer
In the aerobic system, fatigue results from a combination of factors, including the depletion of glycogen stores, a decrease in the ability to transport oxygen, and the accumulation of metabolic byproducts. As exercise continues, the body’s ability to maintain adequate energy production diminishes due to these factors, leading to fatigue.