TABLE 2.

CPX Responses at Maximal Effort for Men and Women^a,^b

Variable	Age group (y)
	20–29 (n= 513 men and 410 women)	30–39 (n= 963 men and 608 women)	40–49 (n= 1327 men and 843 women)	50–59 (n= 1078 men and 805 women)	60–69 (n= 593 men and 408 women)	70–79 (n= 137 men and 98 women)	All (n= 4611 men and 3172 women)
Men
V̇O2max(mLO2·kg−1·min−1)	47.6±11.3	43.0±9.9	38.8±9.6	33.8±9.1	29.4±7.9	25.8±7.1	37.9±11.1
HRmax (/min)	190±11	185±11	176±14	168±14	158±17	147±20	174±17
RER	1.20±0.10	1.18±0.10	1.18±0.10	1.16±0.09	1.15±0.09	1.16±0.10	1.17±0.10
Women
V̇O2max(mLO2·kg−1·min−1)	37.6±10.2	30.9±8.0	27.9±7.7	24.2±6.1	20.7±5.0	18.3±3.6	27.6±9.1
HRmax (/min)	189±12	184±11	176±14	167±15	157±17	147±21	172±18
RER	1.17±0.10	1.18±0.10	1.17±0.10	1.16±0.10	1.13±0.09	1.13±0.08	1.16±0.10

^aCPX = cardiopulmonary exercise testing; HR_max = maximum heart rate; RER = respiratory exchange ratio; V̇_O2max= maximal oxygen uptake.

^bData are presented as mean ± SD. All statistical comparisons of differences in V V̇_O2max were significant (P<.001, men greater than women, both for sex main effect and at each decade).