Which of the following factors could be examined to provide evidence of improvements in aerobic conditioning?

• A. Reduced lung capacity
• B. Decreased muscle flexibility
• C. Decreased resting heart rate
• D. Increased blood pressure at rest

Answer: (C)

Verified step by step guidance

1. Understand the concept of aerobic conditioning: Aerobic conditioning refers to the body's ability to efficiently use oxygen during prolonged physical activity. Improvements in aerobic conditioning are often associated with enhanced cardiovascular and respiratory function.
2. Examine the physiological markers of aerobic conditioning: Key indicators include decreased resting heart rate, increased stroke volume, improved oxygen uptake, and enhanced efficiency of the cardiovascular system.
3. Analyze the options provided: Reduced lung capacity and increased blood pressure at rest are not indicative of improved aerobic conditioning, as they suggest a decline in respiratory and cardiovascular health. Decreased muscle flexibility is unrelated to aerobic conditioning and pertains more to musculoskeletal health.
4. Focus on decreased resting heart rate: A lower resting heart rate is a strong indicator of improved aerobic conditioning. It reflects the heart's ability to pump blood more efficiently, requiring fewer beats per minute to maintain circulation at rest.
5. Conclude that decreased resting heart rate is the correct answer: This physiological change demonstrates enhanced cardiovascular efficiency, which is a hallmark of improved aerobic conditioning.