Medical Education Commons^™

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], …

A Comparison Of Multiple Body Composition Measurement Methods To The Department Of Defense’S Physical Fitness And Body Fat Program Procedures, Desmond J. Millender, Holly M. Hall, Jeremy B. Ducharme, Avadney F. Gerard-Osbourne, Ann L. Gibson

International Journal of Exercise Science: Conference Proceedings

INTRODUCTION: The Department of Defense (DoD) developed body composition standards that require service personnel to meet sex- and branch-specific body mass index criteria. Failing to meet these criteria leads to body fat percentage (%BF) estimation via the DoD’s circumference method. Service members exceeding these standards face administrative action and a possible premature discharge, thus emphasizing the importance of accurately estimating %BF with this method.

PURPOSE: To compare the predictive accuracy of the DoD’s circumference-based equation to estimate %BF compared to hydrostatic weighting (HW); segmental and whole-body bioelectrical impedance analyses (BIA), and sex-specific skinfold thickness assessments.

METHODS: Physically active …

Kinesiophobia Prevalence Among College Athletes, Lindsey R. Mcneely, Robert I. Dudley

International Journal of Exercise Science: Conference Proceedings

The fear avoidance model indicates that fear of re-injury and movement related fear (kinesiophobia) can foster avoidant behaviors leading to potentially injurious changes in movement. The Tampa Scale of Kinesiophobia (TSK-11), an 11-question survey, measures movement related fear. While much of the kinesiophobia literature has focused on individuals with chronic pain, there is little evidence on the prevalence of kinesiophobia among collegiate athletes, a population with high frequency of injury. What little evidence exists indicates a connection between high kinesiophobia and injurious movement patterns. PURPOSE: Given the lack of data on collegiate athletes, the purpose of this investigation is to …

Electromyographic Examination Of Hip And Knee Extension Hex Bar Exercises Varied By Starting Knee And Torso Angles, Meghan Mccauley, Jennifer Rivera, Whitney D. Leyva, Kalin A. Tomlinson, Kevin A. Valenzuela, Elisabeth Zeitz, Edward Jo Dr.

International Journal of Exercise Science: Conference Proceedings

Variations of the deadlift can be executed using the hexagonal (hex) bar by altering, for instance, the knee and torso angles while maintaining a constant hip angle at the start position. PURPOSE: To examine muscle activation patterns of the biceps femoris, rectus femoris, and erector spinae during three deadlift variations using the hex bar. METHODS: Twenty resistance-trained male and female subjects performed hex bar deadlift variations in three different starting knee flexion positions: 128.4 ± 8.5° (elevated Romanian Deadlift), 111.9 ± 8.7° (conventional elevated deadlift), and 98.3 ± 6.5° (conventional hexagonal bar deadlift). Subjects performed three repetitions at …

Investigation Of Swimming Economy While Wearing Different Triathlon Wetsuit Styles At Submaximal Front Crawl Swimming, Boram Lim, Alejandro Villalobos, George Crocker, John Mercer Dr.

International Journal of Exercise Science: Conference Proceedings

Triathlon wetsuits commonly use for the potential benefits of swimming performance and thermoregulation. Triathletes may select different wetsuit styles depending on many factors (e.g., temperature regulation swimming technique, body type, and training purpose). However, there is a lack of empirical evidence of how different wetsuit styles affect the physiological responses to swimming. PURPOSE: The purpose of this study was to investigate the physiological responses during submaximal intensity front crawl swimming using different wetsuit styles. METHODS: Fourteen participants (n=6 men, n=8 women; all recreational triathletes or swimmers) completed a swimming graded exercise test wearing a swimsuit only to determine …

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 …

Analysis Of Comparative Enjoyment Following High To Moderate Intensity Upper Body Cycling And Lower Body Cycling In Lean And Obese, Kyle Larsen, David H. Fukuda Ph.D., Anthony Ciccone, Nicolas Clark

International Journal of Exercise Science: Conference Proceedings

The combination of utilizing differing aerobic exercise prescriptions such as arm cycling and traditional leg cycling at varying exercise intensities may affect an individual’s enjoyment of exercise. PURPOSE: This study compared levels of perceived enjoyment obtained following isocaloric arm and leg cycling trials performed at heavy and moderate intensities among lean and average (LA) and overfat and obese individuals (OFO). METHODS: Participants included 36 young adults divided into two groups based on their Fat Mass Index (FMI) (LA=4.6±1.7 FM kg/m², OFO=9.9±3.5 FM kg/m²). They completed a combination of four arm and leg cycling isocaloric …

Estrogen Receptor Alpha Controls Mitochondrial Function And Metabolic Homeostasis, And Is Critical For Exercise-Induced Improvements In Metabolism, Alexia M. Joseph

International Journal of Exercise Science: Conference Proceedings

Skeletal muscle is an important tissue responsible for locomotion, oxidative metabolism, and insulin-stimulated glucose disposal. Because exercise is the most effective means to combat metabolic dysfunction and prevent the progression of type 2 diabetes, our laboratory is interested in understanding the molecular transducers underlying the health benefits of exercise. Previous work by our group has shown that muscle ESR1/ERα expression is correlated with indices of metabolic health, and Esr1 expression in muscle is induced following exercise training.

PURPOSE: Determine whether genetic overexpression of Esr1 to mimic transcript induction by physical activity is sufficient to produce favorable metabolic changes …

Kinesiology Student Led 3 Wins Fitness; Free Exercise Program Pivots Virtual And Emerges From Pandemic As Hybrid Park-Based Program For Underserved Communities, David Jimenez, Arlene Flores, Gabrielle Villagra, Joshua Carlos, Steven Loy

International Journal of Exercise Science: Conference Proceedings

3 WINS Fitness is a FREE program delivered by Kinesiology students from Cal State University, Northridge focused on underserved communities in the San Fernando Valley. PURPOSE: The program aims to increase the health and fitness of participants, build healthier communities, and reduce population physical inactivity through exercise while developing students’ professional skills. METHODS: The structure of the program gives students an opportunity to apply in-class knowledge in a real-life setting. This translates to engaging participants of all fitness levels in 60 minutes of moderate-to-vigorous physical activity 3 days/week. Many students had no prior in-park experience before this fall …

The Effects Of A Fitness And Wellness Course On Physical Activity Behavior And Intentions: Comparing In-Person Learning To Remote Learning., Calia A. Hunter, Carson Croel, Shannon R. Siegel Facsm, Stephanie Cooper

International Journal of Exercise Science: Conference Proceedings

College students are often at-risk for physical inactivity. Many higher education institutions do not require physical activity courses, thus limiting the opportunity to promote physical activity. Of particular interest is the relationship between physical activity, mental health, and perceived barriers (e.g. access to resources, school-related responsibilities). Decreasing physical inactivity in college students by embedding a mandatory fitness and wellness course into the curriculum could be a viable option. PURPOSE: The purpose of this study was to distinguish if a fitness and wellness course delivered through an in-person or remote modality would affect students’ physical activity behavior and intention throughout a …

Systematic Observation Of Mask Adherence And Physical Distancing In A Public Recreational Setting In Response To Public Policy, Andrea Hughes, Jason Ng

International Journal of Exercise Science: Conference Proceedings

During the COVID-19 pandemic, regular physical activity (PA) remained an important recommendation to prevent hypokinetic diseases. At the same time, changes in policies on mask wearing and physical distancing may have increased confusion about engaging in PA. Public outdoor recreation spaces are potentially valuable resources to address these challenges, however there is limited knowledge of mask and distancing behaviors in outdoor recreational areas. PURPOSE: The aim of this study was to observe mask and distancing behaviors of individuals performing PA at a public outdoor recreational setting. METHODS: We used a modified version of the Systematic Observation of Mask Adherence and …

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 …

Time Course Of Supine Assessment Of Bioelectrical Variables: An Evaluation Of Resistance, Reactance, And Phase Angle, Holly Hall, Jeremy B. Ducharme, Jonathan M. Houck, Avadney Gerard-Osbourne, Chloe Clark, Ann Gibson

International Journal of Exercise Science: Conference Proceedings

To minimize the effect of shifts in bodily water compartments, assessments of resistance (R) and reactance (Xc) via bioelectrical impedance analysis (BIA) is recommended to occur after the individual has been supine for 15 minutes. While changes in bodily water compartments within 15 minutes of laying in the supine position may affect values for R and Xc, it’s unknown how these body water shifts affect phase angle (PhA). PURPOSE: Investigate the effect of time for stabilization of supine measurements of R, Xc, and PhA obtained via the RJL Quantum Legacy BIA analyzer. METHODS: Thirty-eight men (n=16) and women …

Validity Of Average Heart Rate And Energy Expenditure In Polar Oh1 And Verity Sense While Self-Paced Running, Damian Gil, Bryson Carrier, Wyatt Fullmer, Kyle Cruz, Charli D. Aguilar, Dustin W. Davis, Elias M. Malek, Nathaniel Bodell, Jeff Montes, Jacob W. Manning, James W. Navalta, Marcus M. Lawrence, Mark Debeliso Phd

International Journal of Exercise Science: Conference Proceedings

Running is one of the most common forms of exercise in the world today. Technological advancements have contributed to the rise in the usage of wearable technology. Polar is a household name leading this amelioration of wearable technology. The Polar OH1 and Verity Sense are two of the typical models used to measure heart rate and energy expenditure, however, the validity of these devices have yet to be investigated. PURPOSE: The purpose of this study was to determine the validity of the Polar OH1 and the Verity Sense during self-paced running. METHODS: Twenty participants (n=10 female, n=10 male; …

Validity Of Average Heart Rate And Energy Expenditure In Polar Armband Devices While Self-Paced Biking, Wyatt B. Fullmer, Bryson Carrier, Elias Malek, Damian Gil, Kyle Cruz, Charli Aguilar, Dustin Davis, Nathaniel Bodell, Jeff Montes, Jake Manning, Mark Debeliso, Facsm, James Navalta, Facsm, Marcus M. Lawrence

International Journal of Exercise Science: Conference Proceedings

Wearable technology has become an increasingly utilized tool to track various aspects of physical activity amongst fitness enthusiasts and the general public. Polar is a common brand that is utilized, and many use the devices for a variety of modalities, like walking, running, or biking. However, the validity of Polar’s armband optical devices in estimating average heart rate (HR) and energy expenditure (EE) while biking is unknown. PURPOSE: The purpose of this study was to determine if two devices, the Polar OH1 and Polar Verity Sense, record valid measures of average HR and EE while self-paced biking. METHODS: Twenty participants …

The Effects Of Exercise On Inflammatory Biomarkers Over A 36-H Fast, Austin F. Duersch, Bruce W. Bailey, Landon Deru

International Journal of Exercise Science: Conference Proceedings

Postprandial and diet-induced chronic inflammation has become a popular point of discussion over recent years in lifestyle medicine as studies have uncovered the effects that various inflammation markers have on chronic diseases including heart disease, diabetes mellitus, and arthritis. Interventions to help lower inflammation could help promote longevity and decrease risk of chronic diseases. PURPOSE: While previous research has shown various effects of fasting on inflammatory biomarkers, this study assessed the impact of an acute 36h fast with or without exercise at the beginning on inflammatory biomarkers (IL-6, C-peptide, GIP, MCP-1, and TNF-alpha). METHODS: Twenty healthy subjects (11 …

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 …

Validity Of The K5 Wearable Metabolic System During The Ymca Bench Press Test - A Pilot Study, Kyle Cruz, James W. Navalta, Dustin W. Davis, Bryson Carrier

International Journal of Exercise Science: Conference Proceedings

The accelerated advancements in exercise technology have resulted in the development of wearable metabolic units, allowing measurements to occur outside traditional laboratories. The validation of new equipment is essential in various applications. PURPOSE: The pilot study's purpose was to validate the metabolic measurements of the COSMED K5 wearable metabolic system against the criterion Parvo Medics TrueOne 2400 during a modified YMCA Bench Press Test. METHODS: Nine resistance weight-trained participants (six male, three female, age 29.3 ± 8.0 yrs, 78.1 ± 13.8 kg, 173.3 ± 11.5 cm) performed two identical tests on the same day. Because of equipment warm-up times, the …

Coordination Of Ankle, Knee, And Hip Joint Torques During An American Football Long Snap, Faith Cottam, Travis Peterson Ph.D

International Journal of Exercise Science: Conference Proceedings

Research has studied upper-body kinematics (Balentine 2020) and whole-body kinetics during the American Football long snap (Goldstein 2020). There are no studies describing lower extremity (LE) joint kinetics during this movement. PURPOSE: This study aimed to understand how players coordinate LE torques while completing a long snap. We hypothesized there would be plantarflexor torques at the ankle and extensor torques at the knee and hip. METHODS: Subjects included college-aged football players (n=5) and high school football (n=5) players with >2years experience. All subjects provided informed consent per local IRB. Average age of participants was 18.9±1.3 years, average mass was 99.57±7.49 …