Which activity would primarily rely on the aerobic energy system?

Which activity would primarily rely on the aerobic energy system?

• A. 100m sprint
• B. Marathon
• C. Hockey
• D. Short tennis rally

Answer: (B)

The main idea here is how energy is produced to suit the length of the activity. The marathon relies primarily on the aerobic energy system because it is a long, steady effort that lasts for hours. The aerobic system uses oxygen to produce ATP through oxidative phosphorylation, drawing on fats and carbohydrates for fuel. That allows the body to keep supplying energy at a sustainable rate over a prolonged period, with the cardiovascular and respiratory systems continuously delivering oxygen to the muscles. In contrast, a 100m sprint is over in a matter of seconds, so it depends mainly on the rapid but finite energy from the ATP-PC system and, to a lesser extent, anaerobic glycolysis, which don’t require oxygen and exhaust quickly. Hockey and short tennis rallies involve short bursts of high-intensity effort and repeated actions, so they use a mix of energy systems, with the aerobic system supporting longer periods and recovery but not dominating the peak effort.

The main idea here is how energy is produced to suit the length of the activity. The marathon relies primarily on the aerobic energy system because it is a long, steady effort that lasts for hours. The aerobic system uses oxygen to produce ATP through oxidative phosphorylation, drawing on fats and carbohydrates for fuel. That allows the body to keep supplying energy at a sustainable rate over a prolonged period, with the cardiovascular and respiratory systems continuously delivering oxygen to the muscles.

In contrast, a 100m sprint is over in a matter of seconds, so it depends mainly on the rapid but finite energy from the ATP-PC system and, to a lesser extent, anaerobic glycolysis, which don’t require oxygen and exhaust quickly. Hockey and short tennis rallies involve short bursts of high-intensity effort and repeated actions, so they use a mix of energy systems, with the aerobic system supporting longer periods and recovery but not dominating the peak effort.