From the obtained ECG recording frequency domain parameters namely Total Power (TP), High Frequency (HF--0.15 to 0.4 Hz) reflecting parasympathetic tone
, Low Frequency (LF 0.04 - 0.15 Hz) representing both sympathetic and parasympathetic tone
, Very Low Frequency (VLF--0.0033 to 0.04 Hz) reflecting thermoregulatory mechanisms and LF/HF Ratio an indicator of sympatho vagal balance were recorded.
(3) The subjects in the Fornari et al study who received CST after receiving a stressor had marked improvement in parasympathetic tone
and a much lower overall Cortisol response compared to the control group who did not receive any treatment after the stressor.
In a population of normal subjects, using short-term and long-term observations, it was found that parasympathetic tone
is predominant over sympathetic tone in women and vice versa in men.
There are other fancy ways to measure sympathetic and parasympathetic tone
. EEGs can show the activity in different parts of the brain that control the sympathetic and parasympathetic nervous systems.
A possible autonomic imbalance in peripheral vertigo might be due to a change in parasympathetic tone
. This possibility needs further studies.
There is a report, which suggests that normalized units of LF and HF are more sensitive indicators compared with the raw data of LH and HF for assessing sympathetic and parasympathetic tone
These suggest an enhanced sympathetic and depressed parasympathetic tone
at rest, in basketball players, relative to soccer and field hockey athletes.
For all time domain parameters, high values presumably represent a strong parasympathetic tone
or little sympathetic activity.
They postulated that a handstand is likely to cause vagal stimulation by transiently increasing thoracic pressure, stimulating baroreceptor activity in the aortic arch and carotid bodies and resulting in increased parasympathetic tone
. Their case demonstrated that although not widely recognized as a form of treatment, handstands can be a very effective and safe treatment.
In our case, the inadequate age-predicted heart rate at peak exercise suggests a strong basal parasympathetic tone
. The ST-segment elevation and atrioventricular dissociation rhythm during the recovery phase suggest preexisting strong parasympathetic tone
reactivation after strong sympathetic stimulation at peak exercise.
had a significant increase of parasympathetic tone
with a sympathetic predominance before exercise; 2) according to subject's circadian typology, E-Types during morning training presented a significant parasympathetic withdrawal with a sympathetic predominance at REST and before (T0) HIIT compared to M-Types; this activation also remained in the 24 hours the cessation of the exercise; 3) During evening training both groups showed and higher predominance of the sympathetic tone (T0), but no significant differences between M-Types and E-Types were observed.
The increased heart rate in the study group seems a good evidence of increased sympathetic or reduced parasympathetic tone
in the study group which gets further reinforced by decreased resting HRV and lower E:I and 30:15 ratio.