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Describe the effect of stroke volume and cardiac output on aerobic performance. - HSC - SSCE Personal Development and Physical Education - Question 25 - 2013 - Paper 1
Question 25
Describe the effect of stroke volume and cardiac output on aerobic performance.
Worked Solution & Example Answer:Describe the effect of stroke volume and cardiac output on aerobic performance. - HSC - SSCE Personal Development and Physical Education - Question 25 - 2013 - Paper 1
Step 1
Effect of Stroke Volume on Aerobic Performance
Answer
Stroke volume refers to the amount of blood ejected by the heart with each contraction. In the context of aerobic performance, a higher stroke volume allows for more oxygenated blood to be delivered to the muscles during exercise. This increased blood flow enhances the capacity for aerobic metabolism, improving endurance and overall athletic performance. Athletes often experience an increase in stroke volume through training, as the heart becomes more efficient.
Step 2
Effect of Cardiac Output on Aerobic Performance
Answer
Cardiac output is the product of stroke volume and heart rate, representing the total volume of blood the heart pumps per minute. High cardiac output is essential for sustaining high-intensity aerobic activities, as it ensures that sufficient oxygen reaches the working muscles. Improved cardiac output leads to better performance, as the body can maintain activity levels for longer periods without fatigue. Training can enhance both stroke volume and heart rate response, ultimately increasing cardiac output.