A method to quantify autonomic nervous system function in healthy, able-bodied individuals

Table 1 Autonomic response classification

	Epoch	S	Features	P	Features
Squat Test⁶⁹	Squat	HR, MAP		RMSSD
Squat Test⁶⁹	Stand	HR, MAP	V only	HR, MAP, RMSSD	H only
Cold Pressor¹¹⁷	Hand In	MAP
Cold Pressor¹¹⁷	Hand Out			MAP
Diving Reflex⁵⁶	Mask On	MAP		HR, RMSSD
Diving Reflex⁵⁶	Mask Off
Valsalva Maneuver⁹⁹	Inhale	MAP		HR
	VM	HR		MAP
	Release	MAP		HR
Deep Breathing¹⁰⁵	First 2 min			HR, RMSSD	V only

Responses were categorized as sympathetic or parasympathetic-driven based on literature and observed data. For most responses, both scale (V) and stretch (H) features were used together for classification. In the stand epoch during the squat test, only V were classified as sympathetic and only H were classified as parasympathetic. Similarly, only a scale feature during the deep breathing test was considered as parasympathetic. Other responses were ignored, as they could not be classified as primarily sympathetic or parasympathetic branch driven

ISSN: 2332-8886