True Fitness Z7 Series - Manual (Page 68)

fitness test, maximal: the only valid way to accurately determine
maximal oxygen uptake, using VO
2
monitoring. Several protocols
exist, but in general a treadmill is used and the exercise intensity is
gradually increased over a five to eight minute period. The subject
is strongly encouraged to run to absolute exhaustion which, given
the psychological and safety difficulties of this, creates inevitable
variations in test results. This maximal effort is supposed to contain
within it some point where the subject is consuming the maximum
amount of oxygen.
fitness test, submaximal: a safer, easier, and more convenient way to
estimate maximal oxygen uptake, at the expense of a great deal of
accuracy. The best results from such tests is typically +/- 15% com-
pared with “true” VO
2
max. These tests are usually staged extrapola-
tion protocols, such as the YMCA bike protocol and some tread-
mill protocols. Non-extrapolation protocols include the Astrand-
Ryhming bike protocol and the Gerkin treadmill protocol.
heart rate, maximum (HRmax) : the heart rate at which the body will
allow no further increase. For healthy people, reaching maximum
heart rate is not unsafe. HRmax is usually an estimate based on age,
as it decreases with age.
heart rate reserve (HRR): the range of heart rate values between
maximum and resting heart rates. This is useful because it cor-
responds very closely to the VO
2
range from resting to maximum.
%HRR reserve thus is a very good estimate of % VO
2
max.
heart rate, resting: most accurately measured when laying down in
the morning, with no food or caffeine ingestion for at least the pre-
vious three hours.
interval workout: consists of alternating periods of widely different
exercise intensities, usually called the work and rest intervals. (In
the origin of the phrase, interval referred only to the rest interval.)
A
PPENDIX
E - G
LOSSARY
Z 7 Tr e a d m i l l O w n e r ' s G u i d e 96