ANS

autonomic nervous system

BBT

basal body temperature

BMI

body mass index

BP

blood pressure

BR/BF

breathing rate or breathing frequency

Ca2+

calcium

Cl-

chloride

CNS

central nervous system

E2

β17-estradiol

ECG

electrocardiogram

fAi

free androgen index

FFT

Fast Fourier Transform

FSH

follicle-stimulating hormone

fT

free Testosterone

GnRH

gonadotrophic releasing hormone

HF

power in high frequency bands (0.15-0.4 Hz)

HFnu

high frequency in normalized units HFnu=HF(HF+LF)

HR

heart rate

HRV

heart rate variability

INS

insulin

K+

potassium

LF

power in low frequency bands (0.04-0.15 Hz)

LFnu

low frequency in normalized units;

LFnu=LF(LF+HF)

LH

luteinizing hormone

LHRH

hypothalamic releasing hormone

M

menstruation phase

meanNN

mean of all NN or RR intervals

Mg2+

magnesium

MidF

middle of the follicular phase

MidL

middle of the luteal phase

MT

trained men

MUT

untrained men

Na+

sodium

NN/RR intervals

normal to normal intervals

O

ovulation phase

P

progesterone

PCO2

partial pressure of CO2

pNN50

relation of NN differences <50ms to total NN interval number

POMS

profile of mood state questionnaire

PreM

pre menstruation phase

RMSSD

square root of means of squared differences of consecutive NN intervals

RSA

respiratory sinus arrhythmia

SDNN

standard deviation of all NN intervals

SHBG

sexual hormone binding globulin

TAge

trainings age of certain sport

TP

total power;

sum of ULF, VLF, LF and HF power

TSpweek

training sessions per week

tT

total testosterone

TUpweek

training units per week

ULF

power in ultra low frequency band (0-0.0033 Hz)

VE

ventilation volume

VLF

power in very low frequency band (0.0033-0.04 Hz)

VO2max

maximal oxygen uptake

VO2rel

oxygen uptake in relation to the body weight

Vt

tidal volume

WT

trained women

WUT

untrained women