Table 1

Measured values of maximal oxygen uptake (Vo₂max) and inspired partial pressures of oxygen (Pio₂) at various altitudes in three landmark investigations^6,^7,⁹

Study	Sample size (n)	Altitude (m) Model atmosphere	Pio₂ (mm Hg)	Vo₂max(ml/kg/min)
*One subject in the original paper was excluded from analysis because of infectious illness at the time of exercise testing.
Pugh et al⁹	3	Sea level	147.1	52.1
	3	4650	82.3	41.7
	3	5800	69.7	33.0
	3	6400	62.2	28.5
	1	7440	53.0	22.8*
West et al⁶	5	Sea level	147.1	61.3
	8	6300	63.7	32.4
	6	8050	48.5	20.6
	2	8848	42.5	15.3
Sutton et al⁷	8	Sea level	150.0	50.8
	8	4300	80.0	37.3
	7	6500	63.0	27.2
	5	8100	49.0	23.3
	5	8848	43.0	15.4