Exercise economy refers to?

Exercise economy refers to?

• A. Efficiency is increased and the fatigue of contractile mechanisms is delayed
• B. Increased heart rate during activity
• C. Greater force variability
• D. More oxygen consumption at a given workload

Answer: (A)

Exercise economy is about how efficiently the body uses energy to produce a given amount of work. When economy improves, you can perform the same workload with less energy, which often means a lower oxygen cost and a slower onset of fatigue. The statement that best fits this is that efficiency is increased and the fatigue of contractile mechanisms is delayed—better efficiency means the muscles work more economically, so the metabolic strain is reduced and fatigue develops later. The other ideas don’t capture this efficiency angle: heart rate alone isn’t a direct measure of energy cost, force variability relates to neuromuscular control rather than energy efficiency, and consuming more oxygen at the same workload signals worse, not better, economy.

Exercise economy is about how efficiently the body uses energy to produce a given amount of work. When economy improves, you can perform the same workload with less energy, which often means a lower oxygen cost and a slower onset of fatigue. The statement that best fits this is that efficiency is increased and the fatigue of contractile mechanisms is delayed—better efficiency means the muscles work more economically, so the metabolic strain is reduced and fatigue develops later. The other ideas don’t capture this efficiency angle: heart rate alone isn’t a direct measure of energy cost, force variability relates to neuromuscular control rather than energy efficiency, and consuming more oxygen at the same workload signals worse, not better, economy.