Stairmaster 4000 PT series, Owner'S Manual

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Page 19
4000 PT CONSOLE
THE FITNESS TEST PROGRAMS
Understanding Submaximal Exercise Testing
Before using the StairMaster ® 4000 PT ® for submaximal exercise testing, it
should be noted that all submaximal fitness tests make several assumptions:
• That a steady-state heart rate is obtained for each exercise
workload.
• That a linear relationship exists between heart rate, oxygen
uptake and workload.
• That the maximal heart rate for a given age is uniform.
• That the mechanical efficiency of the physical activity performed
(i.e., oxygen uptake at a given workload) is the same for
everyone.
It should be kept in mind that any one or all of the above mentioned
assumptions may not be met during a submaximal exercise test. If for any
reason one of the assumptions is not met, then errors in predicting VO
2 max
will
occur.
Unfortunately, it is often quite difficult to meet all of the requirements
for the four listed assumptions. For example, exercising at a given workload for
only a few minutes can involve an insufficient amount of time for many
individuals to achieve a true steady-state. To ensure that a steady-state has
been achieved, the heart rate should be measured after two minutes of
exercise at a given workload and again after the third minute of exercise at
that workload. These two heart rates should then be compared. If a difference
of more than five beats per minute between the two is found, the subject
should continue to exercise at one-minute intervals at the same workload until
two successive heart rates differ by less than five beats per minute.
It is also important that the submaximal heart rates obtained be
between 115 and 150 beats per minute, because it is within this heart rate
range that a linear relationship tends to exist between heart rate and oxygen
uptake or workload for most adults. When the heart rate is less than 115,
many external factors (e.g., talking, laughing, apprehension, etc.) can greatly
influence heart rate. Once the heart rate reaches a level between 115 and