ADMA	asymmetric dimethylarginine
ATP	adenosine triphosphate
BMI	body mass index
CG	control group
EG	experimental group
GC-MS	gas chromatography-mass spectrometry
HGPRT	hypoxanthine-guanine phosphoribosyltransferase
HIIT	high-intensity interval training
HRmax	maximum heart rate
LC-MS	liquid chromatography-mass spectrometry
LLOQ	lower limit of quantification
MDBF	Mehrdimensionaler Befindlichkeitsfragebogen (German)
MSI-CE-MS	multi-segment injection-capillary electrophoresis-mass spectrometry
NMR	nuclear magnetic resonance
p	p-value of context-dependent test
PGC-1α	peroxisome proliferator-activated receptor gamma coactivator 1-alpha
Pmax	maximal power
QC	quality control
RPE	rating of perceived exertion
rpm	revolutions per minute
SDMA	symmetric dimethylarginine
TMAO	trimethylamine-N-oxide
Tmax	time to exhaustion at Pmax
TRIMP	training impulse
UPLC-MS/MS	ultra-performance liquid chromatography-tandem mass spectrometry
V1	visit 1 (day before the training started)
V2	visit 2 (day after the the last training session)
V3	visit 3 (after four days of recovery);
VO2max	maximal oxygen consumption