Introduction
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Heart RateA heart rate reflects the amount of work the heart must do to meet the increased demands of the body when engaged in activity. It is one of the simplest and most informative of the cardiovascular parameters. The heart rate is determined by counting the number of times your heart contracts in a certain period and then converting this number to the standard measure in beats per minute. For an average person who does not exercise regularly, the heart will beat about 70-75 times per minute. Cross-country skiers have an average heart rate of 28-40 beats per minute! Olympic cross-country skiers often have larger hearts, slower resting heart rates, and an increased coronary circulation as a result of their endurance training. |
Stroke Volume
An Olympic cross-country skier, with a stronger heart, can pump as much as 100 ml with each contraction. For an average person, the stroke volume is about 70 ml. Each time the heart contracts, blood is ejected. This is referred to as the stroke volume. The stroke volume is the volume of blood ejected from the left ventricle.
- Describe the difference between resting heart rate and maximum heart rate
- Calculate heart rate threshold levels and target zones
- List the four factors which determine stroke volume
- Learn about new cardiovascular diagnostic techniques which determine how stroke volume changes with exercise.
- Calculate a stroke volume
Terms to know
- Heart rate: The number of times the heart contracts per minute.
- Resting heart rate: The heart rate at rest; averaging 60 to 80 beats per minute.
- Maximum heart rate: The highest heart rate value attainable during an all-out effort to the point of exhaustion.
- Stroke Volume: Vollume of blood pumped per heart contraction.
- EDV: End diastolic (resting phase) value.
- ESV: End systolic (pumping phase) value.
- Resting heart rate
- Maximal heart rate
- Four factors which determine stroke volume
- Cardiovascular diagnostic techniques
- Questions for your review
