The use of HRV in the early detection of fatigue or over-training
is based in the following facts: physical workloads are a physiological
stress manifesting as a high sympathetic stimulation; The
recovery process involves the reduction of sympathetic stimulation
and the return to a resting parasympathetic predominance.
We can assume that poor assimilation of workloads (which lead
to fatigue) will be reflected in a resting state marked by elevated
sympathetic tone and/or depressed parasympathetic.
But the utility of HRV does not only depend on the variables that
can be measured in the different domains and the knowledge
that we may obtain from its physiological significance, but also
that it is determined by other factors. These factors include the
measurement method, the techniques used for the analysis of
the time series, and the frequency that the measurements have
to be performed to obtain useful information. In this study, the
measurements were made almost weekly, being more frequent
depending on how the season progressed. Although some
authors suggest using a minimum of 3 valid HRV measurements
per week to analyse the adaptivity to training loads [36], our
experience shows that one weekly record provides valuable
information in soccer.
As for the variables measured in this study, we have selected
those that have a much wider consensus among investigators
The use of HRV in the early detection of fatigue or over-trainingis based in the following facts: physical workloads are a physiologicalstress manifesting as a high sympathetic stimulation; Therecovery process involves the reduction of sympathetic stimulationand the return to a resting parasympathetic predominance.We can assume that poor assimilation of workloads (which leadto fatigue) will be reflected in a resting state marked by elevatedsympathetic tone and/or depressed parasympathetic.But the utility of HRV does not only depend on the variables thatcan be measured in the different domains and the knowledgethat we may obtain from its physiological significance, but alsothat it is determined by other factors. These factors include themeasurement method, the techniques used for the analysis ofthe time series, and the frequency that the measurements haveto be performed to obtain useful information. In this study, themeasurements were made almost weekly, being more frequentdepending on how the season progressed. Although someauthors suggest using a minimum of 3 valid HRV measurementsper week to analyse the adaptivity to training loads [36], ourexperience shows that one weekly record provides valuableinformation in soccer.As for the variables measured in this study, we have selectedthose that have a much wider consensus among investigators
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