Statistical analysis
ES	the effect size
F	F-value
Me	median
p	p-value
Q1	lower quartiles
Q3	upper quartiles
SD	standard deviation
x	arithmetic mean
Cardiac biomarkers
CK-MB	creatine kinase-MB isoenzyme
CN/NFAT	calcineurin nuclear factor of activated T-cells
cTnI	troponin I
cTnT	troponin T
H-FABP	heart-type fatty acid-binding protein
MB	myoglobin
mtCK	creatine kinase isoforms, including mitochondrial
NFAT	nuclear factor of activated T-cells
Physiological variables
BF	breathing frequency
FiO2	fraction of inspired oxygen
HR	heart rate
VCO2	exhaled carbon dioxide
VE	minute ventilation
VO2	oxygen uptake
VO2max	maximal oxygen uptake
VO2maxhyp	maximal oxygen uptake in hypoxia
WRmax	maximal workload
Ppeak	peak power during Wingate test for upper limbs
Pmean	mean power during Wingate test for upper limbs
ΔPV%	plasma volume changes
Training
EN2	endurance training (75–85% HR LT)
EN3	endurance training (95–105% HR LT)
IHT	intermittent hypoxic training
Pmean	mean power during Wingate test for upper limbs
Ppeak	peak power during Wingate test for upper limbs
REC	recovery training
S1	first test series
S2	second test series
SP1	anaerobic capacity training
ST	core stability training
TL4	training in the lab—4 circuits
TL5	training in the lab—5 circuits