Which of the following can be a major contributor to fatigue during exercise?

Inadequate hydration is a significant factor contributing to fatigue during exercise. Adequate hydration is crucial for maintaining blood volume, regulating body temperature, and ensuring effective muscle contraction. When the body is dehydrated, it can lead to a decrease in performance, increased perceived exertion, and quicker onset of fatigue. This happens because dehydration impairs cardiovascular function and causes a higher heart rate, which means that the body has to work harder to deliver oxygen to the muscles, leading to quicker exhaustion.

High protein intake, while important for muscle repair and recovery, does not directly relate to acute fatigue experienced during exercise. A regular exercise routine typically improves overall fitness levels, endurance, and muscle strength, contributing positively to an individual's ability to perform exercises without pronounced fatigue. Proper nutrition, while vital for sustaining energy levels and overall health, does not specifically isolate fatigue-related factors, as it involves a balanced intake of carbohydrates, fats, proteins, vitamins, and minerals. Thus, the focus on hydration becomes critical for optimal exercise performance and energy levels.