HMS, BM EQ-Bank 169

Explain how duration affects the body's utilisation of the three energy systems during a 400 m sprint. (3 marks)

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Sample Answer

Initial 0-10 seconds utilises ATP-PCr system for immediate energy at race start
As duration extends to 10-45 seconds, glycolytic system becomes predominant providing energy through glucose breakdown
Final stages see increased aerobic contribution as duration approaches 60 seconds though glycolytic remains primary
Systems overlap throughout race duration but predominance shifts based on time demands

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Sample Answer

Initial 0-10 seconds utilises ATP-PCr system for immediate energy at race start
As duration extends to 10-45 seconds, glycolytic system becomes predominant providing energy through glucose breakdown
Final stages see increased aerobic contribution as duration approaches 60 seconds though glycolytic remains primary
Systems overlap throughout race duration but predominance shifts based on time demand