Health and Physical Education Commons^™

Cardiorespiratory Fitness Level Alters Blood Pressure Responses Induced By Histamine H1- And H2-Receptor Blockade During Dynamic Exercise, Albert A. Lira Jr., Dustin J. Lirazan, Ronaldo U. Meneses, Sung J. Yun, Jong-Kyung Kim

International Journal of Exercise Science: Conference Proceedings

Epidemiological studies have reported that greater cardiorespiratory fitness (CRF) is associated with lower blood pressure (BP). Histamine receptor-mediated peripheral vasodilation contributes to postexercise hypotension and lowing exercising BP responses. Previously, our laboratory found that overactive BP responses to exercise were induced by the inability of histamine receptors in individuals with prehypertension. However, it is still unknown that CRF can impact BP responses elicited by the inability of the receptors. Purpose: This study was to assess whether aerobic fitness is effective in lowering excessive BP responses induced by the blockade of histamine receptors. Methods: In twelve male and female subjects (6 …

Acute Effect Of Dietary Supplementation With Grape Seed Extract Attenuates Blood Pressure Increase During Cold Pressor Test In Prehypertensive Men, Sarah Greenawalt, Albert A. Lira Jr., Kylie J. Morrison, Ronaldo U. Meneses, Christen J. Lutz, Savannah C. Ulhir, Jong-Kyung Kim

International Journal of Exercise Science: Conference Proceedings

It is well documented that prehypertension or hypertension is associated with sympathetic overdrive and loss of parasympathetically mediated cardiac variability. Previous studies demonstrated that increased NO bioavailability reduced central sympathetic output. Despite the fact that grape seed extract (GSE) treatment increases the production of NO and improves endothelial function in prehypertensive males, no studies have assessed the effects of GSE on autonomic balance and autonomic function. PURPOSE: the aim of the study was to investigate the acute effect of dietary GSE supplementation on heart rate variability (HRV) and cold pressor test (CPT). METHODS: Six males were recruited in this study. …

Maintained Elevated Systolic Blood Pressures In African Americans And Hispanic Individuals Following Maximum Oxygen Consumption Test When Compared To Caucasians: A Pilot Study, Zaria S. Opara, Heysel Morales, Michael Diaz, Allan Knox

International Journal of Exercise Science: Conference Proceedings

PURPOSE: There is robust evidence presenting higher incidences of hypertension experienced by the African American (AA) population when compared with matched cohorts. Exercise has been shown to reduce the prevalence of hypertension, however, the cardiovascular recovery of exercise is associated with mortality. The purpose of the present study was to investigate the cardiovascular recovery between AAs, Hispanics (HSPs), and Caucasians (CAs). METHODS: VO_2max was measured by indirect calorimetry. Body composition was measured by air displacement plethysmography (BODPOD). Brachial blood pressures were captured by automated cuff before exercise, immediately after exercise, and every 2 minutes following exercise for a total …

Two Weeks Of Remote Ischemic Preconditioning Improved Cutaneous Microvascular Responses To Post-Occlusive Reactive Hyperemia, Martin Navarro

International Journal of Exercise Science: Conference Proceedings

Repeated remote ischemic preconditioning (RIPC), induced by intermittent periods of ischemia and reperfusion in a limb body, improves non-nitric oxide (NO)-mediated endothelial-dependent cutaneous vasodilation. Post-occlusive reactive hyperemia (PORH) occurs following the release of a brief arterial occlusion and is principally mediated by non-NO mediated vasodilatory factors such as prostaglandins, sensory nerve axon reflex, and endothelium-derived hyperpolarizing factors (EDHFs). However, the role of repeated bouts of RIPC on the PORH response is unknown. The purpose of this study was to test whether two weeks of RIPC improves PORH elicited cutaneous microvascular hyperemia responses. METHODS:The study was conducted with twenty-one participants …

No Sex Differences In Common Carotid Artery Stiffness Response Following Maximal Oxygen Consumption Test, Heysel Y. Morales, Michael Diaz, Zaria Opara, Allan Knox

International Journal of Exercise Science: Conference Proceedings

PURPOSE: Previous investigations have reported sex differences in the time course of age-related arterial stiffness, with postmenopausal women presenting increased risk of cardiovascular diseases. Using sex as a biological variable has identified differences between males and females in physiological responses to equivalent doses of exercise. The purpose of this study was to determine if sex differences exist in arterial stiffness response to a maximum oxygen consumption (VO2max) exercise test. METHODS: VO2max was measured by indirect calorimetry. Body composition was measured by air displacement plethysmography (BODPOD). Indices of common carotid artery (CCA) stiffness (Peterson’s elastic modulus [Ep], Beta stiffness [B1], …

Rapid Onset Vasodilation With Lower Body Positive And Negative Pressure, Olivia Leach, Gary Mack, Jayson Gifford

International Journal of Exercise Science: Conference Proceedings

PURPOSE: Investigate the impact of muscle sympathetic activity changes on the hyperemic response to single muscle contraction (i.e., rapid-onset vasodilation, ROV). METHODS: Muscle sympathetic activity was altered in 14 healthy young subjects (8 male, 6 female) through randomized application of lower body negative pressure (-10, -20, and -40 mmHg) and lower body positive pressure (+10, +20 mmHg). A 1-s hand grip contraction at 50% MVC was performed at each pressure and control (0 mmHg). Blood flow and vascular conductance were quantified with muscle blood flow being measured in the brachial artery using Doppler ultrasound and blood …

Validation Of The Garmin Fenix 6s Maximal Oxygen Consumption (Vo2max) Estimate, Macy M. Helm, Bryson Carrier, Dustin W. Davis, Kyle Cruz, Brenna Barrios, James W. Navalta

International Journal of Exercise Science: Conference Proceedings

Commercially available fitness watches provide recreational athletes insight into aerobic fitness. The Garmin fēnix. 6S (GF) is a recently released multisport watch that provides estimations related to aerobic and endurance performance, including maximal oxygen consumption (VO2max). VO2max is an important physiological metric to determine aerobic capacity, structure training, and anticipate race performance. PURPOSE: Therefore, the purpose of this study was to determine the validity and accuracy of the GF’s prediction of VO2max in the general population compared to lab-based measurements. METHODS: 20 healthy participants (9 male, 11 female, 24 土 5.4 years, 30.45 土 21.79 km run/wk) participated in two …

Are Age-Related Differences In Critical Power And Work-Prime Simply Due To Differences In Muscle Mass, Abigail Dorff

International Journal of Exercise Science: Conference Proceedings

Critical Power (CP) represents the threshold between sustainable, steady-state and unsustainable, non-steady-state exercise while Work Prime (W’) represents tolerable work above CP. The combination of CP and W’ potently influence exercise tolerance. We recently observed age-related reductions in both CP and W’ in active adults. Age-related decreases in muscle mass, which was not measured, could account for the reduction in CP and W’. PURPOSE: The aim of this study was to determine if CP and W’ are decreased in active, older adults when normalizing for muscle mass. METHODS: Single leg knee extension exercise was used to determine CP …

Maximum Aerobic Exercise Induces Common Carotid Vasoconstriction And Increased Vascular Resistance, Michael Diaz, Zaria Opara, Heysel Morales, Allan Knox

International Journal of Exercise Science: Conference Proceedings

PURPOSE: Low-to-moderate intensity aerobic exercise has been reported to elicit changes in systemic hemodynamics. Recent evidence suggests that the cerebral circulation reacts independently to systemic circulations to the same physiological stimuli. The aim of this is to determine the influence of high-intensity aerobic exercise on common carotid artery (CCA) hemodynamics. METHODS: Hemodynamic measurements were recorded before and following the cessation of a maximum oxygen uptake test (VO_2max). One minute video of the CCA by Doppler ultrasound were recorded and used to determine peak systolic velocity (PSV), end diastolic velocity (EDV), time averaged mean blood velocity (TAMEAN), timed …

Assessing The Validity Of Several Heart Rate Monitors In Wearable Technology While Mountain Biking, Bryson Carrier, R. W. Salatto, Dustin W. Davis, Jacquelyn V.L. Sertic, Brenna Barrios, Peyton Cater, James W. Navalta

International Journal of Exercise Science: Conference Proceedings

The development of fitness trackers and other wearable technology designed for health and fitness purposes is growing in popularity and sophistication every day. These devices have the ability to measure or estimate a variety of physiological and physical variables, such as step count, energy expenditure, VO2max, lactate threshold, heart rate, stride length, vertical oscillation, ground contact time, blood oxygen saturation (via pulse oximetry), and many others. PURPOSE: In order to properly use these devices, independent validation needs to take place to determine the device’s accuracy and ability to properly measure or estimate each variable. Therefore, the purpose of this …

Autonomic And Cardiovascular Responses To Acute Exercise In Children With Autism Spectrum Disorder, Allison T. Bui, Gustavo Aldama, Kauionalani P. Kekuawela, Jacob A. Manriquez, Areum K. Jensen

International Journal of Exercise Science: Conference Proceedings

Autism Spectrum Disorder (ASD) is a complex neurological disorder identified in early childhood and is characterized by impaired social interaction and atypical behaviors. Limited studies reported that children with ASD tend to have higher heart rate (HR) and blood pressure (BP) at rest compared to typically developing children (TDC). Previously, we reported that HR and blood flow (BF) did not alter during exercise while BP significantly increased in ASD. Thus, we thought that ASD may have impaired autonomic control of cardiac output via differential contribution of HR and stroke volume (SV) to regulate BP during acute exercise. PURPOSE: To …

Genetic Drivers Of Cardiac Remodeling In Health And Disease In Female Mice, Alexander R. Strumwasser

International Journal of Exercise Science: Conference Proceedings

SWACSM Abstract

Genetic drivers of cardiac remodeling in health and disease in female mice

Alexander R. Strumwasser¹, Timothy M. Moore¹, Zhenqi Zhou¹, Lorraine P. Turcotte², Aldons J. Lusis¹, Andrea L. Hevener¹

1Department of Medicine, University of California, Los Angeles 2Department of Biological Sciences, University of Southern California

Hevener Laboratory; Department of Medicine; University of California Los Angeles Laboratory

Category: Masters

Advisor / Mentor: Hevener, Andrea L. ahevener@mednet.ula.edu

ABSTRACT

PURPOSE: Sex differences in cardiac metabolism and cardiometabolic disease susceptibility are well documented. However, the mechanisms underlying sexual dimorphism and …

Hemodynamics After Glucose Loading In Hispanics With And Without Family History Of Type 2 Diabetes, Gabriel Figueroa, Ryan D. Russell, Yu Lun Tai

International Journal of Exercise Science: Conference Proceedings

Type 2 Diabetes (T2D) increases cardiovascular mortality 4-fold. Although ~9% of Americans are diagnosed with T2D, T2D incidence is substantially higher in Hispanics and those with a have family history of T2D. Traditionally, T2D is diagnosed via oral glucose testing which has been shown to impair microvascular function. However, the effects of glucose loading on hemodynamics and arterial elasticity between healthy Hispanics with and without a family history of T2D are unclear. PURPOSE: To determine the effects of an oral glucose challenge (OGC) and a mixed meal challenge (MMC) on hemodynamics in healthy Hispanic individuals with and without family …