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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
Amylopectin has a higher glycaemic index (GI) compared to amylose. This means that amylopectin is digested and absorbed more quickly, leading to a rapid increase in blood glucose levels. This is beneficial for a runner because having a readily available source of glucose enhances energy availability during physical activity. In contrast, amylose has a lower GI and digests more slowly, providing a more sustained release of glucose. Eating a meal with a balance of both can help cyclists maintain energy levels for an extended period, allowing for both immediate and sustained energy during a run.
Step 2
cellular respiration.
Answer
Cellular respiration is the process by which cells convert glucose into energy (ATP) in the presence of oxygen. The glucose derived from the starch consumed will undergo glycolysis, producing pyruvate, which then enters the Krebs cycle when sufficient oxygen is available. This process efficiently generates ATP, which is essential for muscle contraction and overall physical performance. Therefore, a meal rich in starch taken a few hours before running enhances the availability of glucose, leading to improved stamina and endurance during the run.