Question

What is the effect of exercise on cardio respiratory system?

Answer 1

1. Heart rate increases: The resting heart rate of healthy persons falls between 60 and 80 beats per minute. In middle-aged, inactive people, it could reach 100 beats per minute. Elite endurance athletes have been observed to have heart rates as low as 28–40 beats per minute. Even before exercise starts, the heart rate rises in anticipation; this is known as the anticipatory response, and it is brought on by the release of the neurotransmitters norepinephrine and adrenaline.
2. Stroke volume increases: The stroke volume, which is expressed in milliliters per beat, is the volume of blood expelled from the left or right ventricle. The stroke volume increases proportionately with exercise intensity.