title: Hemodynamic responses associated with post-exercise hypotension in normotensive black males.
abstract: The purpose of this study was to characterize the hemodynamic responses during recovery from moderate intensity exercise in young black normotensive males. Nineteen normotensive men (age 25.0 +/- 1.0 yrs, VO2peak 48.8 +/- 1.5 ml.kg-1.min-1) walked continuously on a treadmill for 40 minutes at 50-60% heart rate reserve. Following exercise, blood pressure (by auscultation) and hemodynamic variables (impedance cardiography) were monitored for two hours in a quiet room with subjects in a seated posture. During the initial 40 minutes of recovery, cardiac output, (Q) was significantly greater than the pre-exercise baseline (p < 0.05). This was mediated by heart rate, which was elevated above the pre-exercise baseline for 75 minutes. Mean systolic blood pressure (SBP) was reduced by at least 7 mm Hg from 30 minutes to 2 hours post-exercise, compared to the pre-exercise baseline, (mean = 112 +/- 1.6) (p < 0.05). Total peripheral resistance (TPR, dyne.s.cm-5) was depressed for 60 minutes compared to the pre-exercise baseline (BL, 959.8 +/- 40.6), p < 0.05, but was fully recovered by two hours. It was concluded that in this group of young black normotensive males, moderate intensity aerobic exercise led to a prolonged reduction in SBP through relative changes in Q and TPR. These observations have not been consistently observed by other investigators in normotensive white males under similar experimental conditions.
authors.affiliation: Division of Movement Sciences, Springfield College, MA 01109, USA.
authors.forename: S A
authors.initials: SA
authors.lastname: Headley
authors.forename: J M
authors.initials: JM
authors.lastname: Claiborne
authors.forename: C R
authors.initials: CR
authors.lastname: Lottes
authors.forename: C G
authors.initials: CG
authors.lastname: Korba
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D044383:Black People; D001794:Blood Pressure / Q000502:physiology*; D016022:Case-Control Studies; D015444:Exercise / Q000502:physiology*; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008297:Male; D014481:United States; D001741:Black or African American