Table 2.

Descriptive, baseline variables, hemodynamic, and cardiorespiratory fitness responses to maximum exercise on a cycle ergometer for black and white American mean stratified by race and age group. Data presented as mean ± SD along with results of two-way ANOVA.

	18–29 years		30–39 years		40–49 years		50–59 years		60–75 years
Characteristic	Black (n=208)	White (n=611)	Black (n=284)	White (n=1232)	Black (n=383)	White (n=1519)	Black (n=302)	White (n=1056)	Black (n=68)	White (n=333)	Statistics
Age (y)	24.4 ± 3.5	24.6 ± 3.2	34.9 ± 2.8	34.8 ± 2.8	44.5 ± 2.7	44.6 ± 2.8	53.6 ± 2.8	53.7 ± 2.8	63.7 ± 3.5	64.3 ± 3.6	Age Group (p<.001)*
											Race (p=.075)
											Interaction (p=.674)
Height (cm)	178.3 ± 7.7	180.1 ± 7.2	178.6 ± 7.7	179.8 ± 7.0	178.7 ± 7.6	179.8 ± 6.8	179.5 ± 7.1	179.5 ± 6.7	181.4 ± 8.6	179.7 ± 6.4	Age Group (p =.079)
											Race (p=.056)
											Interaction (p=.007)*
Weight (kg)	83.1 ± 15.7	85.1 ± 15.8	89.5 ± 14.5	89.6 ± 14.3	91.4 ± 13.4	90.4 ± 13.9	89.7 ± 13.7	89.2 ± 12.8	90.0 ± 11.4	85.8 ± 12.6	Age Group (p<.001)*
											Race (p=.162)
											Interaction (p=.052)
BMI (kg/m2)	26.1 ± 4.4	26.2 ± 4.4	28.0 ± 3.9	27.7 ± 3.8	28.6 ± 3.6	27.9 ± 3.8	27.8 ± 3.7	27.8 ± 3.7	27.3 ± 3.0	27.3 ± 3.0	Age Group (p<.001)*
											Race (p=.007)*
											Interaction (p=.202)
Resting SBP (mmHg)	115 ± 12	117 ± 11	119 ± 12	118 ± 11	120 ± 13	120 ± 12	123 ± 14	122 ± 13	128 ± 14	124 ± 13	Age Group (p<.001)*
											Race (p=.005)*
											Interaction (p=.02)*
Resting DBP (mmHg)	76 ± 9	75 ± 8	78 ± 9	77 ± 8	80 ± 9	78 ± 9	80 ± 9	79 ± 8	81 ± 8	78 ± 8	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.14)
Resting HR (bpm)	75 ± 11	78 ± 13	76 ± 12	75 ± 12	75 ± 12	75 ± 12	74 ± 12	75 ± 12	72 ± 11	72 ± 12	Age Group (p<.001)*
											Race (p=.18)
											Interaction (p=.035)*
Peak SBP (mmHg)	167 ± 24	167 ± 21	176 ± 26	171 ± 21	182 ± 26	176 ± 22	184 ± 27	180 ± 24	187 ± 27	182 ± 24	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.12)
Δ SBP (mmHg)	52 ± 21	50 ± 20	57 ± 23	53 ± 21	62 ± 24	56 ± 21	61 ± 23	59 ± 22	58 ± 25	58 ± 20	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.208)
Max HR (bpm)	158 ± 16	168 ± 15	155 ± 17	162 ± 14	150 ± 17	155 ± 15	147 ± 16	150 ± 15	139 ± 17	143 ± 16	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p<.001)*
Absolute V̇o2 (L·min−1)	2.23 ± 0.55	2.74 ± 0.67	2.19 ± 0.52	2.7 ± 0.62	2.07 ± 0.46	2.53 ± 0.56	1.96 ± 0.42	2.34 ± 0.53	1.8 ± 0.39	2.11 ± 0.49	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.016)*
Relative V̇o2 (ml·kg−1·min−1)	27.0 ± 5.8	32.8 ± 8.2	24.6 ± 5.4	30.5 ± 7.0	22.8 ± 4.7	28.3 ± 6.6	22.0± 4.4	26.5 ± 6.1	20.2 ± 4.6	24.9 ± 6.0	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.124)
Max RER	1.13 ± 0.09	1.13 ± 0.08	1.16 ± 0.1	1.13 ± 0.07	1.16 ± 0.1	1.13 ± 0.07	1.15 ± 0.09	1.13 ± 0.08	1.15 ± 0.1	1.12 ± 0.08	Age Group (p=.014)*
											Race (p<.001)*
											Interaction (p=.001)*
Peak O2 Pulse (ml/beat)	14.1 ± 3.1	16.3 ± 3.7	14.1 ± 3.3	16.7 ± 3.7	13.8 ± 2.8	16.4 ± 3.5	13.4 ± 2.6	15.6 ± 3.3	12.9 ± 2.4	14.7 ± 3.0	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.321)
SBP/MET-slope (mmHg/MET)	8.07 ± 3.82	6.35 ± 2.93	9.81 ± 4.55	7.25 ± 3.25	11.63 ± 4.92	8.38 ± 3.59	12.14 ± 5.51	9.36 ± 3.93	13.02 ± 6.41	10.1 ± 4.18	Age Group (p<.001)*
											Race (p<.001)*
											Interaction (p=.002)*