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 ResearchMeSH KeywordsAndrogensBlood PressureBody Mass IndexFemaleHumansInsulinInsulin ResistanceObesityPolycystic Ovary SyndromeTestosteroneConceptsSympathetic 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 BP
2022
Consequences of hyperandrogenemia during pregnancy in female offspring: attenuated response to angiotensin II
Shawky NM, Dalmasso C, Ojeda NB, Zuchowski Y, Stachenfeld N, Alexander BT, Reckelhoff JF. Consequences of hyperandrogenemia during pregnancy in female offspring: attenuated response to angiotensin II. Journal Of Hypertension 2022, 40: 712-722. PMID: 34980865, PMCID: PMC8897268, DOI: 10.1097/hjh.0000000000003067.Peer-Reviewed Original ResearchConceptsPolycystic ovary syndromeAttenuated pressor responsesPressor responseBlood pressureAng IIHyperandrogenemic femalesAngiotensin IIFemale offspringModel of PCOSNitrate/nitrite excretionSimilar baseline blood pressureIntrarenal Ang IIBaseline blood pressureElevated blood pressureExaggerated pressor responseHigh-salt dietLow birth weightFemale control offspringDihydrotestosterone pelletsMaternal hyperandrogenemiaMore proteinuriaPCOS womenOvary syndromeRenal injurySalt diet
2020
A recent history of preeclampsia is associated with elevated central pulse wave velocity and muscle sympathetic outflow
Usselman CW, Adler TE, Coovadia Y, Leone C, Paidas MJ, Stachenfeld NS. A recent history of preeclampsia is associated with elevated central pulse wave velocity and muscle sympathetic outflow. AJP Heart And Circulatory Physiology 2020, 318: h581-h589. PMID: 32004082, DOI: 10.1152/ajpheart.00578.2019.Peer-Reviewed Original ResearchConceptsMuscle sympathetic nerve activitySympathetic nerve activityArterial stiffnessBaroreflex sensitivityPreeclamptic womenUncomplicated pregnanciesNerve activityBlood pressureCardiovascular diseaseCentral pulse wave velocityCardiovagal baroreflex sensitivityElevated arterial stiffnessMuscle sympathetic outflowElevated cardiovascular riskHistory of preeclampsiaNormal blood pressurePeripheral arterial stiffnessSympathetic baroreflex sensitivitySympathetic nervous systemPulse wave velocityHigher MSNACardiovascular dysregulationSympathetic outflowCardiovascular riskNormal pregnancy
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
Contribution of Increased Angiotensin II Sensitivity to Microvascular Dysfunction in Women With a History of Preeclampsia
Usselman CW, Stachenfeld NS. Contribution of Increased Angiotensin II Sensitivity to Microvascular Dysfunction in Women With a History of Preeclampsia. Hypertension 2017, 70: 245-246. PMID: 28652470, DOI: 10.1161/hypertensionaha.117.09527.Peer-Reviewed Original Research
2016
Sex hormone effects on autonomic and endothelial function
Stachenfeld NS. Sex hormone effects on autonomic and endothelial function. Quarterly Journal Of Experimental Physiology And Cognate Medical Sciences 2016, 101: 347-348. PMID: 27511123, DOI: 10.1113/ep085720.Peer-Reviewed Reviews, Practice Guidelines, Standards, and Consensus Statements
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
2013
Mechanisms contributing to low orthostatic tolerance in women: the influence of oestradiol
Wenner MM, Haddadin A, Taylor HS, Stachenfeld NS. Mechanisms contributing to low orthostatic tolerance in women: the influence of oestradiol. The Journal Of Physiology 2013, 591: 2345-2355. PMID: 23401618, PMCID: PMC3650699, DOI: 10.1113/jphysiol.2012.247882.Peer-Reviewed Original ResearchConceptsLow orthostatic toleranceE2 administrationOrthostatic toleranceVascular resistanceBlood pressureStroke volumeHeart rateGonadotrophin-releasing hormone antagonistLevels of LBNPLower central volumeReproductive hormone productionAdministration of E2Peripheral vascular resistanceBeat blood pressureAutonomic cardiovascular regulationLower stroke volumeLower body negative pressure testHeart rate responseInfluence of oestradiolBaroreflex controlTolerant womenHormone antagonistCardiovascular regulationPeripheral vasoconstrictionAutonomic control
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 toleranceBlood pressure and water regulation: understanding sex hormone effects within and between men and women
Wenner MM, Stachenfeld NS. Blood pressure and water regulation: understanding sex hormone effects within and between men and women. The Journal Of Physiology 2012, 590: 5949-5961. PMID: 23027816, PMCID: PMC3530109, DOI: 10.1113/jphysiol.2012.236752.Peer-Reviewed Original ResearchConceptsOvarian hormone exposureBlood pressureHormone exposureHormone effectsYoung womenOvarian hormone effectsSuppress reproductive functionBlood pressure controlFirst-line treatmentSex differencesEffects of estrogenPlasma volume expansionCause of deathSex hormone effectsBody fluid regulationGreater morbidityHealthy womenLine treatmentOvarian hormonesMenopausal womenBody water balanceOrthostatic toleranceProgesterone exposureMenstrual cycleHormone administration
2001
Estrogen and progesterone effects on transcapillary fluid dynamics
Stachenfeld N, Keefe D, Palter S. Estrogen and progesterone effects on transcapillary fluid dynamics. AJP Regulatory Integrative And Comparative Physiology 2001, 281: r1319-r1329. PMID: 11557642, DOI: 10.1152/ajpregu.2001.281.4.r1319.Peer-Reviewed Original ResearchMeSH KeywordsAdultAtrial Natriuretic FactorBlood PressureBlood VolumeCapillariesCapillary PermeabilityCardiac OutputDrug Administration RoutesEstradiolEstrogensFemaleFertility Agents, FemaleForearmGonadotropin-Releasing HormoneHematocritHot FlashesHumansInfusions, IntravenousLeuprolideProgesteroneStroke VolumeVeinsConceptsCapillary filtration coefficientANP infusionGnRH analoguesPlasma volumeProgesterone effectsTranscapillary fluid dynamicsGonadotropin-releasing hormone analogueLittle systemic effectMin of infusionBaseline plasma volumeHormone administrationPV lossSystemic effectsReproductive functionInfusionAdministrationTreatmentEstrogenPeptide controlFiltration coefficientWeeksWomenANPDaysHematocrit
1999
Effects of oral contraceptives on body fluid regulation
Stachenfeld N, Silva C, Keefe D, Kokoszka C, Nadel E. Effects of oral contraceptives on body fluid regulation. Journal Of Applied Physiology 1999, 87: 1016-1025. PMID: 10484572, DOI: 10.1152/jappl.1999.87.3.1016.Peer-Reviewed Original ResearchConceptsBody fluid regulationLuteal phaseHighest plasma estradiol concentrationFluid regulationOral contraceptive administrationBody fluid retentionPlasma estradiol concentrationsMidluteal menstrual phasesBody fluid balanceArginine vasopressin concentrationBasal plasma osmolalityExercise dehydrationOral contraceptivesContraceptive administrationBody water balanceFluid retentionFollicular phaseEstradiol concentrationsAVP releaseMenstrual phaseFluid balanceVasopressin concentrationCrossover designThirst stimulationPlasma osmolality
1994
Comparison of submaximal treadmill and supine bicycle exercise
Coplan N, Sacknoff D, Stachenfeld N, Gleim G. Comparison of submaximal treadmill and supine bicycle exercise. American Heart Journal 1994, 128: 416-418. PMID: 8037113, DOI: 10.1016/0002-8703(94)90499-5.Peer-Reviewed Original Research
1991
Gender differences in the systolic blood pressure response to exercise
Gleim G, Stachenfeld N, Coplan N, Nicholas J. Gender differences in the systolic blood pressure response to exercise. American Heart Journal 1991, 121: 524-530. PMID: 1990758, DOI: 10.1016/0002-8703(91)90721-s.Peer-Reviewed Original ResearchConceptsSystolic blood pressure responseBlood pressure responseSystolic blood pressureBody surface areaLean body massBlood pressurePressure responseBody weightHigher systolic blood pressureSympathetic nervous system responsesNormal cardiac responseUrinary norepinephrine excretionPeak heart rateNervous system responsesGender differencesNorepinephrine excretionBody massExercise modalitiesDynamic exerciseHeart rateCardiac responseInfluence of genderMenModalitiesResponse