What typically results from a high stroke volume in athletes during intense physical activity?

A high stroke volume in athletes during intense physical activity is primarily associated with more efficient oxygen use. Stroke volume refers to the amount of blood the heart pumps with each beat, and in well-trained athletes, the cardiovascular system adapts to enhance this volume. When stroke volume increases, it allows for greater amounts of oxygenated blood to be delivered to the muscles during physical exertion.

This enhanced delivery of oxygen is crucial during intense exercise, as it supports the muscles' energy production and overall performance. With improved oxygen supply, athletes can maintain higher intensities for longer periods without succumbing to fatigue. Furthermore, as the body becomes more efficient at utilizing oxygen during prolonged exercise, the overall endurance and performance of the athlete improve.

In contrast, increased fatigue is generally associated with suboptimal oxygen delivery, and higher body temperature is a byproduct of increased metabolic processes rather than a direct result of stroke volume. Moreover, a lower metabolic rate would not be expected with an increase in stroke volume, as athletes typically demonstrate higher rates of metabolic activity to support their performance needs. Thus, the relationship between high stroke volume and more efficient oxygen use stands out as the primary benefit in the context of athletic performance during intense activity.