Which option reflects the physiological adaptations expected in an endurance swimmer’s training program? | | Oxygen uptake | Haemoglobin level | Resting heart rate | Stroke volume | |-----------------------|---------------|-------------------|--------------------|---------------| | (A) | Increase | Increase | Decrease | Increase | | (B) | Increase | Decrease | Decrease | Increase | | (C) | Increase | Increase | Decrease | Decrease | | (D) | Increase | Decrease | Increase | Increase | - HSC - SSCE Personal Development and Physical Education - Question 19 - 2010 - Paper 1

To determine the correct answer, we need to analyze the physiological adaptations that occur due to endurance training in swimmers.

1. Oxygen Uptake: It typically increases as the body becomes more efficient at utilizing oxygen during prolonged exercise. This is expected due to enhanced cardiovascular capacity.

2. Haemoglobin Level: The level tends to increase, allowing for better oxygen transportation in the blood. This adaptive response is crucial for improving endurance.

3. Resting Heart Rate: This usually decreases, reflecting improved cardiovascular fitness; a lower heart rate at rest indicates a stronger heart that pumps more efficiently.

4. Stroke Volume: This increases, meaning the heart pumps a greater volume of blood with each beat as a result of training adaptations.

Considering these adaptations, option (A) reflects the expected physiological changes: Oxygen uptake increases, haemoglobin level increases, resting heart rate decreases, and stroke volume increases.