Fatigue of leg muscles may occur after riding many kilometers on a bicycle because of
insufficient glucose
excess carbon dioxide
excess protein
insufficient oxygen
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When riding a bicycle for many kilometers, fatigue in leg muscles occurs primarily due to insufficient oxygen supply. During intense exercise, the muscles require more oxygen to generate energy aerobically. However, as the intensity of exercise increases, the demand for oxygen surpasses the body's ability to supply it. This leads to a condition known as oxygen debt or oxygen deficit, causing fatigue in the leg muscles. Therefore, the correct answer is D. insufficient oxygen.
How is it due to insufficient oxygen?
A. insufficient glucose
During long rides on a bicycle, the muscles require a constant supply of energy to sustain pedaling. This energy is primarily derived from glucose, which is stored in the muscles as glycogen. As the distance increases, the glycogen stores can become depleted, leading to muscle fatigue. Therefore, insufficient glucose availability contributes to fatigue of the leg muscles during extended cycling.
