Discussion
The main contribution of this work was to provide a series of
HRV records in professional soccer players of the highest level
throughout a full season. This, in turn, has enabled reference values
for this population type to be obtained in order to identify
those measures that may be useful in the follow-up of any
fatigue situations.
As far as we know, there are no studies that provide similar data.
There are works that try to establish the role of HRV in the follow-up
of fatigue [30,41,42] and some of them even study soccer
but they are either at lower competitive levels [10,12] or are
conducted in situations limited in time [8,17].