Which activity is most likely to be fueled primarily by lactic acid fermentation?

• A. Long-distance cycling at a steady pace
• B. Sleeping overnight
• C. Sprinting at maximum effort for 30 seconds
• D. Walking at a moderate pace for an hour

Answer: (C)

Verified step by step guidance

1. Understand the concept of lactic acid fermentation: Lactic acid fermentation is an anaerobic process that occurs when oxygen is scarce. It allows cells to produce ATP quickly by converting glucose into lactic acid, but it is not efficient for sustained energy production.
2. Identify the type of activity that requires rapid energy production: Activities that demand short bursts of maximum effort rely on anaerobic processes like lactic acid fermentation because oxygen delivery to muscles cannot keep up with the energy demand.
3. Analyze the options: Long-distance cycling at a steady pace, sleeping overnight, and walking at a moderate pace for an hour are activities that rely primarily on aerobic respiration, which uses oxygen to produce ATP efficiently over longer periods.
4. Focus on sprinting at maximum effort for 30 seconds: Sprinting is a high-intensity activity that requires immediate energy. Since oxygen cannot be delivered quickly enough to meet the demand, lactic acid fermentation becomes the primary source of ATP during this short burst of effort.
5. Conclude that sprinting at maximum effort for 30 seconds is most likely fueled by lactic acid fermentation, as it matches the characteristics of activities relying on anaerobic energy production.