Which physical function is enhanced by improved cardiorespiratory fitness?

Improved cardiorespiratory fitness significantly enhances metabolic rate, which refers to the body's efficiency in converting food into energy. When a person engages in regular cardiovascular exercise, such as running, swimming, or cycling, their heart and lungs improve in efficiency. This leads to better oxygen delivery and utilization throughout the body, resulting in an increased capacity for energy expenditure.

As cardiorespiratory fitness improves, the body enhances its ability to oxidize fat and carbohydrates, resulting in a higher resting metabolic rate. Individuals with higher cardiorespiratory fitness levels often experience greater energy expenditure during both physical activity and at rest, which can also support weight management and overall health.

The other options do not reflect the primary benefits of enhanced cardiorespiratory fitness. For instance, weight gain is typically not an enhancement associated with improved fitness, and electric activity in the brain may not directly correlate with cardiorespiratory fitness levels. Muscle elasticity is influenced more by flexibility and strength training rather than cardiorespiratory fitness specifically.