The heart rate and stroke volume of a 40 year old cyclist were monitored as he used an exercise bike - Scottish Highers Human Biology - Question 8 - 2015
Question 8
The heart rate and stroke volume of a 40 year old cyclist were monitored as he used an exercise bike.
The cyclist was told to pedal at a constant rate as his work l... show full transcript
Worked Solution & Example Answer:The heart rate and stroke volume of a 40 year old cyclist were monitored as he used an exercise bike - Scottish Highers Human Biology - Question 8 - 2015
Step 1
Use data from the graph to describe the changes that occurred in the cyclist's stroke volume when the work level increased from 1 to 7 units.
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Answer
Between work levels 1 to 5, the stroke volume increased steadily. It went from 88 cm³ to 140 cm³ by work level 5, indicating that as the cyclist pedaled harder, his stroke volume increased. Beyond work level 5, it remained constant at 140 cm³.
Step 2
State what the cyclist's heart rate was when his stroke volume was 120 cm³.
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Answer
At a stroke volume of 120 cm³, the cyclist's heart rate was 102 beats/min.
Step 3
Calculate the cyclist's cardiac output when his work level was 6 units.
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Answer
Using the formula for cardiac output:
extcardiacoutput=extheartrateimesextstrokevolume
From the graph, at work level 6, the heart rate is 120 beats/min and the stroke volume is 140 cm³:
Use information from the table and the graph to determine the work level that the cyclist should maintain in order to metabolise fat.
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Answer
To metabolise fat, the cyclist should maintain a heart rate of at least 123 beats/min, corresponding to work level 3.
Step 5
Use information from the table to predict the minimum heart rate for improving the fitness of a 70 year old.
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Answer
For a 70 year old, the minimum heart rate for improving fitness is estimated to be 120 beats/min.
Step 6
Use the table to calculate the percentage decrease that occurs between the ages of 10 and 60 years.
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Answer
The minimum heart rate for improving fitness decreases from 168 beats/min at age 10 to 124 beats/min at age 60. The percentage decrease can be calculated as follows:
