AAS	absolute aerobic scope
AOD	accumulated O2 deficit
CaO2	arterial blood O2 content
Ccrit	critical O2 concentration
CvO2	venous O2 content
DO	dissolved O2 level
DOAAS-50	the water-dissolved O2 that supports 50% of the individual’s AAS
ILOS	incipient lethal O2 saturation
LOC	limiting-O2 concentration
MMR	maximum metabolic rate
ṀO2max	maximum O2 uptake
ṀO2	O2 uptake
ṀO2peak	peak O2 uptake
O2	oxygen
O2crit	critical dissolved O2
P50	a partial O2 pressure where hemoglobin is 50% saturated with O2
Pcrit	critical O2 tension
PO2	partial pressure of O2, or O2 tension
RMR	routine metabolic rate
SMR	standard metabolic rate
U crit	critical swimming speed