2010
Greater Orthostatic Tolerance in Young Black Compared With White Women
Hinds K, Stachenfeld NS. Greater Orthostatic Tolerance in Young Black Compared With White Women. Hypertension 2010, 56: 75-81. PMID: 20458005, PMCID: PMC2909588, DOI: 10.1161/hypertensionaha.110.150011.Peer-Reviewed Original ResearchConceptsLower body negative pressureBody negative pressureOrthostatic toleranceWhite womenHeart rateGreater sympathetic nervous system responseR intervalSympathetic nervous system responsesPlasma renin activityPlasma catecholamine concentrationsSerum aldosterone concentrationNervous system responsesNegative pressureBlack womenCumulative stress indexWoman underwentRenin activityAldosterone concentrationBaroreflex functionBlood pressureCatecholamine concentrationsOrthostatic challengePlasma concentrationsHealthy blacksBlood samples
1994
Effect of athletic training on heart rate variability
Sacknoff D, Gleim G, Stachenfeld N, Coplan N. Effect of athletic training on heart rate variability. American Heart Journal 1994, 127: 1275-1278. PMID: 8172056, DOI: 10.1016/0002-8703(94)90046-9.Peer-Reviewed Original ResearchConceptsHeart rate variabilityRate variabilityParasympathetic toneControl subjectsHeart diseaseVagal activityBaseline parasympathetic toneCardiac vagal toneFrequency domain variablesChronic exerciseHabitual exercisePrognostic stratificationVagal toneControl groupEndurance athletesActivity levelsPatientsAthletic trainingAthletesDiseaseToneExerciseAccurate indicatorSubjectsPrognosis