Matrix COMMERCIAL SERIES TREADMILL Owner's Manual download pdf (Page 25)

NAUTILUS

MORE WORKOUTS: FIT TEST PROGRAM

beats from the average given by a prediction equation. If an individual’s age-predicted maximal heart rate is

higher than that person’s true maximal heart rate, then his/her estimated VO

2 max will be an overestimation of the

correct or actual value.

The ﬁ nal assumption addresses the issue of mechanical efﬁ ciency. Oxygen uptake at any given work rate can

vary by approximately 15% between different individuals. Therefore, individuals vary in the amount of oxygen

they require to perform a certain exercise workload. Some individuals are more efﬁ cient at performing a given

task than others. As a result, the average oxygen consumption associated with a given workload may vary

signiﬁ cantly from one person to another. Thus, VO

2 max predicted by sub-maximal exercise tests tends to be

overestimated for those who are mechanically efﬁ cient and underestimated for those who are inefﬁ cient.

The point to remember is that sub-maximal exercise testing, though not as precise as maximal exercise testing,

is not without advantages. For example, the results of such testing can provide a fairly accurate reﬂ ection of

an individual’s ﬁ tness status without the cost, risk, effort (on the part of the subject) and time involved in max

testing. If an individual is given repeated sub-maximal exercise tests and that person’s heart rate response to

a ﬁ xed workload is found to decrease over time, it is reasonably safe to conclude that the individual has made

improvements in aerobic (cardiorespiratory) ﬁ tness, irrespective of the accuracy of the VO

2 max prediction.

Pretest Screening

Prior to any exercise test (maximal or sub-maximal), participants should complete a brief health/medical

questionnaire, have their resting blood pressure and heart rate measured, and provide an informed consent form.

The Physical Activity Readiness Questionnaire (PAR-Q) is an example of a valid health/medical questionnaire

for screening individuals prior to sub-maximal exercise testing. Canadian health and ﬁ tness practitioners have

extensively (and quite successfully) used the PAR-Q to determine whether individuals should be given an exercise

test. A “yes” answer to any of the following seven questions taken from the PAR-Q would disqualify a participant

from taking part in an exercise test until appropriate medical clearance was obtained.

PHYSICAL ACTIVITY READINESS QUESTIONNAIRE (PAR-Q)

1. Has your doctor ever said you have a heart condition and recommended only medically supervised physical

activity?

2. Do you have chest pain brought on by physical activity?

3. Have you developed chest pain within the past month?

4. Do you tend to lose consciousness or fall over as a result of dizziness?

5. Do you have a bone or joint problem that could be aggravated by the proposed physical activity?

6. Has a doctor ever recommended medication for your blood pressure or a heart condition?

7. Are you aware, through your own experience or a doctor’s advice, of any other physical reason against your

exercising without medical supervision?

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Matrix COMMERCIAL SERIES TREADMILL Owner's Manual Page 25