The low-frequency component power/high-frequency component power ratio (LF/HF ratio) is considered to represent sympathetic activity [ 39].
The high-frequency component of heart rate variability depends on vagal activity, while the low-frequency power predominantly represents sympathetic modulation (30, 31).
The low frequency percentage (LF%) and the low frequency-high frequency (LF/HF) ratio were used to represent sympathetic nervous activity, and the high frequency (HF) was used to represent parasympathetic nervous activity.
Bands at approximately 0.1 Hz represent sympathetic and parasympathetic influence, in contrast with the higher frequency band at 0.25 Hz that is mainly due to the respiratory-driven cardiac vagal efferent modulation.
While LF activity is considered to represent sympathetic efferent cardiac innervation and HF activity due to parasympathetic efferent cardiac innervation, this functional separation is not totally supported by experimental evidence that suggested joint modulation of either region [ 1, 11, 16, 32].
The factor (0.75 + ϕ SN) multiplying E max accounts for the effect of sympathetic tone on contractility, where ϕ SN (t) Є (0,1) is a model variable (see below) representing the sympathetic drive.
Leng also notes the Indian music aspects of the production, in the "swarmandal-like" zithers, representing the sympathetic strings of a sitar, and the slide guitars' evocation of sarangi, dilruba and other string instruments.
He represented many sympathetic plaintiffs, among them some horribly crippled children.
Norman Rockwell is also well represented, his sympathetic eye framing the burning issues of his time: war, in the case of "The Fighting Gillises" (1944), and racial discrimination, in "Study for 'The Problem We All Live With' " (1964).
It is not clear whether this represented early sympathetic ophthalmia, but the inflammation OS completely resolved without medical therapy.
