Which energy system provides long-term energy lasting more than 2 minutes?

Which energy system provides long-term energy lasting more than 2 minutes?

• A. Immediate energy
• B. Glycolytic/Lactic Acid
• C. Aerobic/Oxidative
• D. ATP-PC System

Answer: (C)

Understanding how energy is supplied during exercise shows why the aerobic/oxidative system fits long-term, >2 minutes activity. This system uses oxygen to drive the mitochondrial processes (Krebs cycle and electron transport chain), burning carbohydrates or fats to produce ATP. Because it relies on oxygen, it can sustain ATP production for extended periods, from several minutes to hours, which is why endurance and endurance-strength activities lean on it. The trade-off is rate versus total output: the aerobic system can generate a large amount of ATP, but not as quickly as the immediate or glycolytic systems. Those other systems are designed for short bursts of high power—the ATP-PC system for roughly the first 10 seconds and the glycolytic system for roughly up to 2 minutes. Once the pace lasts longer than a couple minutes, the body shifts to aerobic metabolism to maintain energy production. So, for energy lasting more than about two minutes, the aerobic/oxidative system is the primary source.

Understanding how energy is supplied during exercise shows why the aerobic/oxidative system fits long-term, >2 minutes activity. This system uses oxygen to drive the mitochondrial processes (Krebs cycle and electron transport chain), burning carbohydrates or fats to produce ATP. Because it relies on oxygen, it can sustain ATP production for extended periods, from several minutes to hours, which is why endurance and endurance-strength activities lean on it.

The trade-off is rate versus total output: the aerobic system can generate a large amount of ATP, but not as quickly as the immediate or glycolytic systems. Those other systems are designed for short bursts of high power—the ATP-PC system for roughly the first 10 seconds and the glycolytic system for roughly up to 2 minutes. Once the pace lasts longer than a couple minutes, the body shifts to aerobic metabolism to maintain energy production.

So, for energy lasting more than about two minutes, the aerobic/oxidative system is the primary source.