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While all experts agreed that protein needs for performance are likely greater than believed in past generations, particularly for strength training athletes, and that dietary fat could sustain an active person through lower-intensity training bouts, current research still points to carbohydrate as an indispensable energy source for high-intensity performance - VCE - SSCE Chemistry - Question 10 - 2021 - Paper 1
Question 10
While all experts agreed that protein needs for performance are likely greater than believed in past generations, particularly for strength training athletes, and th... show full transcript
Worked Solution & Example Answer:While all experts agreed that protein needs for performance are likely greater than believed in past generations, particularly for strength training athletes, and that dietary fat could sustain an active person through lower-intensity training bouts, current research still points to carbohydrate as an indispensable energy source for high-intensity performance - VCE - SSCE Chemistry - Question 10 - 2021 - Paper 1
Step 1
the glycaemic indexes of amylopectin and amylose
Answer
The glycaemic index (GI) of a carbohydrate indicates how quickly it raises blood glucose levels after consumption. Amylopectin, comprising about 70% of starch, has a high GI, meaning it is rapidly digestible and quickly elevates blood glucose. This can provide immediate energy for runners prior to their activity.
On the other hand, amylose, which constitutes approximately 30% of starch, has a lower GI due to its slower digestion and absorption. This makes it beneficial for sustained energy release during prolonged exercise. Consuming a meal with a mix of both components allows for quick energy followed by a steady supply, benefiting a runner's performance.
Step 2
cellular respiration
Answer
Cellular respiration is the process by which cells convert glucose into energy (ATP). During running, increased energy demands require efficient ATP production. The immediate glucose provided by amylopectin supports rapid glycolysis, while the slower-released glucose from amylose ensures that energy levels remain stable throughout the duration of the run. This balance optimizes performance, as runners can maintain their energy levels and enhance endurance.