GUIDE
ARTICLES
Heart
rate monitoring
and the physiologic basis of
using it, in
exercise intensity dosage
Ursta Anghel
Mihai Relu
August
Krogh Institute, Department of Human Physiology, University of
Copenhagen, Denmark
Abstract.
The
aim of this article was to observe the relationship between heart
rate (HR) and maximum oxygen uptake (VO2max), as well as
the possibility of using HR in determining intensity level during
physic exercises.
Many
changes
occur prior, at the onset and during the exercise, in response to its
duration and intensity. The main reason is to assure in the shortest
time the required energy. These adaptations consist in increase of
cardiac output (CO) based on increasing HR and stroke volume (SV) and
blood flow within the working muscles and further increment of oxygen
consumption VO2. In submaximal exercise intensity it was
found that the contribution of aerobic energy production increases in
time. The relationship between HR and VO2max is not linear
within low exercise intensity. It tends to become more linear as the
exercise intensity increase. One explanation in this regard, can be
the increase in SV found within high exercise intensities.
Key
words:
heart
rate, VO2max heart debit
