ANS	Autonomic nervous system
CAN	Cardiovascular autonomic neuropathy
CARTs	Cardiovascular autonomic reflex tests
CV	Coefficient of variation
DAN	Diabetic autonomic neuropathy
DM	Diabetes mellitus
DM2	Diabetes mellitus type 2
DN	Diabetic neuropathy
ECG	Electrocardiogram
ED	Erectile dysfunction
FMD	Flow-mediated dilation
HDL-c	High-density lipoprotein
HF	High frequency
HR	Heart rate
HRV	Heart rate variability
LDL-c	Low-density lipoprotein
LF	Low frequency
LHR	Low frequency–high frequency ratio
MSNA	Muscle sympathetic nerve activity
nHFP	Normalized high-frequency power
nLFP	Normalized low-frequency power
PAT	Peripheral arterial tonometry
PET	Positron emission tomography
PNS	Parasympathetic nervous system
PPG	Photoplethysmography
PSRH	Post-stretch reactive hyperemia
RH	Reactive hyperemia
RMSSD	Root mean square of the RR intervals
SBP	Systolic blood pressure
SD1	Standard deviation 1
SD2	Standard deviation 2
SDNN	Standard deviation of RR intervals
SNS	Sympathetic nervous system
SSR	SD1/SD2 ratio
TtP	Pulse transit time