2023
Testosterone-associated blood pressure dysregulation in women with androgen excess polycystic ovary syndrome
Stone T, Yanes Cardozo L, Oluwatade T, Leone C, Burgos M, Okifo F, Pal L, Reckelhoff J, Stachenfeld N. Testosterone-associated blood pressure dysregulation in women with androgen excess polycystic ovary syndrome. AJP Heart And Circulatory Physiology 2023, 325: h232-h243. PMID: 37327000, PMCID: PMC10393337, DOI: 10.1152/ajpheart.00164.2023.Peer-Reviewed Original ResearchConceptsSympathetic nervous system activityBlood pressure dysregulationPolycystic ovary syndromeBody mass indexBaroreflex gainOvary syndromeBlood pressureObese insulin-resistant womenPolycystic ovary syndrome phenotypesRenin-angiotensin system activationSerum angiotensin-converting enzymeGonadotropin-releasing hormone antagonistLower sympathetic nervous system activityLower body negative pressureHeightened cardiovascular riskInsulin-resistant womenSystolic blood pressureBody negative pressureNervous system activityAngiotensin-converting enzymeIR womenCardiovascular riskSerum aldosteroneBaroreflex controlDiastolic BPTestosterone effects on autonomic function in women with androgen excess polycystic ovary syndrome
Stone T, Cardozo L, Oluwatade T, Leone C, Okifo F, Reckelhoff J, Pal L, Stachenfeld N. Testosterone effects on autonomic function in women with androgen excess polycystic ovary syndrome. Physiology 2023, 38: 5729543. DOI: 10.1152/physiol.2023.38.s1.5729543.Peer-Reviewed Original ResearchLower body negative pressureBlood pressureHormone interventionSympathetic baroreflexAutonomic functionSimilar systolic blood pressureGonadotropin-releasing hormone antagonistInsulin-resistant womenDiastolic blood pressurePolycystic ovary syndromeSystolic blood pressureCardiovascular autonomic controlBody negative pressureMSNA activitySerum angiotensinOvarian syndromeOvary syndromeResistant womenBaroreflex sensitivityHormone suppressionSerum aldosteroneAutonomic perturbationsT elevationHormone antagonistElevated androgens
2021
Androgen Effects on Baroreflex Sensitivity in Women with AE‐PCOS
Stone T, Chiles M, Leone C, Pal L, Stachenfeld N. Androgen Effects on Baroreflex Sensitivity in Women with AE‐PCOS. The FASEB Journal 2021, 35 DOI: 10.1096/fasebj.2021.35.s1.04149.Peer-Reviewed Original ResearchMuscle sympathetic nerve activityLower body negative pressureSympathetic baroreflex sensitivityPolycystic ovary syndromeBaroreflex sensitivityBR controlDiastolic BPHormone suppressionImpaired blood pressure regulationGonadotropin-releasing hormone antagonistOral glucose tolerance testDays of GnRHSympathetic nerve activityInsulin-resistant womenMean arterial pressureVascular resistance changesReproductive-age womenGlucose tolerance testBody negative pressureBlood pressure regulationSuppression of E2Bursts/100 heartbeatsCardiovascular comorbiditiesPCOS phenotypeResistant women
2020
Autonomic Dysfunction in Women with Androgen Excess PCOS
Stone T, Leone C, Ayers T, Stachenfeld N. Autonomic Dysfunction in Women with Androgen Excess PCOS. The FASEB Journal 2020, 34: 1-1. DOI: 10.1096/fasebj.2020.34.s1.01846.Peer-Reviewed Original ResearchLower body negative pressurePolycystic ovary syndromeForearm vascular resistanceGnRH-antBlood pressureBaroreflex sensitivityEstrogen suppressionBRS slopeHormone suppressionAutonomic functionElevated blood pressureReproductive-age womenBody negative pressureTestosterone-induced changesAutonomic dysfunctionMild hypertensionVascular resistanceObese womenOvary syndromeGnRH antagonistAge womenBP regulationCardiovascular diseaseReproductive endocrinopathyBiochemical manifestations
2018
Measurement of compensatory reserve predicts racial differences in tolerance to simulated hemorrhage in women
Wenner MM, Hinds KA, Howard JT, Nawn CD, Stachenfeld NS, Convertino VA. Measurement of compensatory reserve predicts racial differences in tolerance to simulated hemorrhage in women. Journal Of Trauma And Acute Care Surgery 2018, 85: s77-s83. PMID: 29443858, PMCID: PMC6023758, DOI: 10.1097/ta.0000000000001837.Peer-Reviewed Original ResearchConceptsLower body negative pressureBeat blood pressureHg lower body negative pressureCentral blood volumeCompensatory reserve measurementHeart rateWhite womenBlood volumeProgressive lower body negative pressureInadequate tissue oxygenationSigns/symptomsBody negative pressureProgressive central hypovolemiaRacial differencesStandard vital signsAfrican American womenBlood pressureHemodynamic decompensationAA womenCentral hypovolemiaRetrospective analysisTissue oxygenationRate of declineHemorrhageNegative pressure
2017
Measurement of the Compensatory Reserve Predicts Racial Differences in Orthostatic Tolerance
Wenner M, Hinds K, Howard J, Nawn C, Stachenfeld N, Convertino V. Measurement of the Compensatory Reserve Predicts Racial Differences in Orthostatic Tolerance. The FASEB Journal 2017, 31: 1087.2-1087.2. DOI: 10.1096/fasebj.31.1_supplement.1087.2.Peer-Reviewed Original ResearchLower body negative pressureBeat blood pressureCompensatory reserve indexMmHg lower body negative pressureCaucasian womenStroke volumeHeart rateOrthostatic toleranceAA womenOrthostatic stressProgressive lower body negative pressureCentral blood volumeBody negative pressureProgressive central hypovolemiaRacial differencesTraditional vital signsUS Army Medical ResearchAfrican American womenBlood pressure waveformBlood pressureHemodynamic decompensationCentral hypovolemiaLBNP stageArmy Medical ResearchBlood volume
2014
Impact of lower body negative pressure induced hypovolemia on peripheral venous pressure waveform parameters in healthy volunteers
Alian AA, Galante NJ, Stachenfeld NS, Silverman DG, Shelley KH. Impact of lower body negative pressure induced hypovolemia on peripheral venous pressure waveform parameters in healthy volunteers. Physiological Measurement 2014, 35: 1509-1520. PMID: 24901895, DOI: 10.1088/0967-3334/35/7/1509.Peer-Reviewed Original ResearchConceptsLower body negative pressureBlood pressureBody negative pressureCardiac modulationHeart ratePulse pressurePVP waveformsProgressive lower body negative pressureArterial systolic blood pressureFinger arterial blood pressurePeripheral venous pressure waveformsMmHg lower body negative pressureMean blood pressureDiastolic blood pressureSystolic blood pressureArterial blood pressureArterial BP valuesPressure waveformSignificant reductionMild hypovolemiaVenous pressureHemodynamic changesIntravenous siteRespiratory modulationBP values
2012
Autonomic control mechanism of maximal lower body negative pressure application
Selvaraj N, Shelley K, Silverman D, Stachenfeld N, Chon K. Autonomic control mechanism of maximal lower body negative pressure application. Annual International Conference Of The IEEE Engineering In Medicine And Biology Society (EMBC) 2012, 2012: 3120-3123. PMID: 23366586, DOI: 10.1109/embc.2012.6346625.Peer-Reviewed Original ResearchConceptsLower body negative pressureDiastolic blood pressureHeart rate variabilityBlood pressure variabilityAutonomic control mechanismsPulse pressureSevere hemorrhageTermination of LBNPLower body negative pressure applicationMaximal lower body negative pressureSystolic blood pressure variabilityRoot mean square successive differenceBody negative pressureConscious human subjectsNegative pressure applicationMean square successive differenceSquare successive differenceHigh-frequency powerLBNP applicationSympathetic reflexesAutonomic reflexesSympathetic activityBaroreflex sensitivityBlood pressureLBNP tolerance
2010
Tissue Doppler of Early Mitral Filling Correlates With Simulated Volume Loss in Healthy Subjects
Moore CL, Tham ET, Samuels KJ, McNamara RL, Galante NJ, Stachenfeld N, Shelley K, Dziura J, Silverman DG. Tissue Doppler of Early Mitral Filling Correlates With Simulated Volume Loss in Healthy Subjects. Academic Emergency Medicine 2010, 17: 1162-1168. PMID: 21175513, DOI: 10.1111/j.1553-2712.2010.00906.x.Peer-Reviewed Original ResearchConceptsInferior vena cavaLBNP levelsTissue DopplerHealthy subjectsVital signsPulsed-wave tissue DopplerLower body negative pressureLateral mitral annulusEmergency department patientsTissue Doppler assessmentTissue Doppler velocitiesEarly diastolic fillingAccurate noninvasive assessmentPulsed-wave spectral DopplerLate transmitralNegative pressure levelBlood pressureDepartment patientsDoppler assessmentVena cavaDiastolic fillingVolume lossCardiovascular diseaseMitral annulusFilling waveGreater 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 samplesPeripheral microvascular responses to norepinephrine in women with orthostatic intolerance
Wenner M, Taylor H, Stachenfeld N. Peripheral microvascular responses to norepinephrine in women with orthostatic intolerance. The FASEB Journal 2010, 24: 991.17-991.17. DOI: 10.1096/fasebj.24.1_supplement.991.17.Peer-Reviewed Original ResearchCumulative stress indexVasoconstrictor responsesAdrenergic responseMaximal lower body negative pressureLower body negative pressurePeripheral microvascular responseEffects of estradiolBody negative pressureFemale sex hormonesSkin blood flowEndogenous E2GnRH antagonistNE infusionDaily administrationMicrovascular responsesCutaneous microvasculatureOrthostatic intoleranceOrthostatic toleranceSex hormonesBlood flowSkin microvasculatureAdrenergic stimulationDay 4Hormone treatmentDay 13Greater orthostatic tolerance in young black compared to white women
Hinds K, Stachenfeld N. Greater orthostatic tolerance in young black compared to white women. The FASEB Journal 2010, 24: 977.9-977.9. DOI: 10.1096/fasebj.24.1_supplement.977.9.Peer-Reviewed Original ResearchLower body negative pressureOrthostatic toleranceWhite womenCumulative stress indexHeart rateLevels of LBNPR intervalPlasma renin activitySympathetic nervous systemSerum aldosterone concentrationBody negative pressureRenin activityAldosterone concentrationBaroreflex functionBlood pressurePlasma catecholaminesOrthostatic stressHealthy blacksBlood samplesNervous systemWomenPresyncopeBaselineYoung blacksBW
2009
FEMALE REPRODUCTIVE HORMONE EFFECTS ON SKIN VESSEL ADRENERGIC RESPONSIVENESS IN WOMEN WITH LOW AND HIGH ORTHOSTATIC TOLERANCE.
Stachenfeld N, Hinds K, Taylor H. FEMALE REPRODUCTIVE HORMONE EFFECTS ON SKIN VESSEL ADRENERGIC RESPONSIVENESS IN WOMEN WITH LOW AND HIGH ORTHOSTATIC TOLERANCE. The FASEB Journal 2009, 23: 968.2-968.2. DOI: 10.1096/fasebj.23.1_supplement.968.2.Peer-Reviewed Original ResearchHigh orthostatic toleranceCumulative stress indexL-NMMAAdrenergic responsivenessOrthostatic toleranceLower body negative pressureReproductive hormone effectsNitric oxide mechanismBody negative pressureLaser Doppler flowmetrySkin blood flowStimulus-response curvesNorepinephrine infusionHormone antagonistDoppler flowmetryBlood flowDay 4Hormone effectsDay 13GnRHProgesteroneOxide mechanismWomenEstradiolResponsiveness