ANS	Autonomous Nervous System
APP	Active Pill Phase
E2	Estradiol
FP	Follicular Phase
HRV	Heart Rate Variability
HR	Heart Rate
LF	Low Frequency
LP	Luteal Phase
MC	Menstrual Cycle
OC	Oral Contraception
P4	Progesterone
RMSSD	Root Mean Square of Successive Difference
RPE	Rating of Perceived Exertion
sRPE	Rating of Perceived Exertion of the Session
SDNN	Standard Deviation of NN intervals
ST	Standing
SU	Supine
WP	Withdrawal Pill