9/14/2023 0 Comments Cardiovascular endurance testsDuring exercise, Joe can likely easily triple his cardiac output to be around 15L per minute whereas Fred probably can only increase his to about 10L per minute. If Joe and Fred both have approximately 5L of total blood volume, their resting cardiac output is approximately 5L per minute because we circulate all of our blood volume approximately once every minute at rest. Stroke volume X heart rate = cardiac output. The heart – the ability of the heart to contract strongly enough to eject a significant amount of blood with each heart beat (called stroke volume), plus the ability to increase in rate.Fred hit his maximal cardiovascular level and experienced fatigue sooner than Joe, so Joe has a higher level of cardiovascular fitness compared to Fred. Suppose Fred decided to try a parkrun but after 1km he just couldn’t catch his breath and his legs were burning and he had to stop running and walk for a bit. Fred is a bit of a couch potato and has a few extra pounds around his midsection. Let’s suppose Joe does parkrun every Sat and runs 5km in about 25-30 min. Let’s compare Joe and Fred, they are both 45 years old. How fit you are determines how much physical exercise you can do before your muscles fatigue. When the muscles can no longer produce enough ATP to keep the muscles contracting, the muscle become fatigued and you can’t continue the activity. Our cardiovascular fitness level is the ability to circulate blood, and therefore glucose and oxygen, to our muscles, as well as the ability of the muscles to use the glucose and oxygen to make ATP. When we do aerobic exercise we increase our breathing rate and heart rate and our muscle cells use oxygen to make energy (ATP). The ability to do sustained exercise for a period of time at moderate to high intensity levels is directly related to the health of your cardiovascular system (heart and blood vessels) as well as muscle conditioning.
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