Exercise Physiology Commons^™

Mechanism Of Nitric Oxide Induced Sympatholysis In Rat Soleus Feed Arteries, Madelyn Whitaker, Jeffrey Jasperse, Tanner Heckle

Seaver College Research And Scholarly Achievement Symposium

During exercise, the neurotransmitter norepinephrine (NE) binds to arterial adrenergic receptors to cause vasoconstriction, yet arteries and arterioles constrict less to sympathetic stimulation in contracting compared to resting skeletal muscle (sympatholysis). Previous evidence indicates that nitric oxide (NO) can be sympatholytic, but the mechanism is unknown. We hypothesized that NO causes sympatholysis in rat soleus muscle feed arteries, that NO is released from vascular endothelial cells by increased shear stress, and that NO acts through a guanylyl cyclase intracellular signaling pathway. Soleus feed arteries (n = 12 per group) were isolated from male Sprague-Dawley rats and cannulated on two glass …

The Influence Of Body Armor On Balance And Movement Quality, Roger O. Kollock Jr, Davis Hale, Rachele E. Vogelpohl, Logan Kremer, Christian Cox, Josh Horner, Matt Allen

International Journal of Exercise Science

International Journal of Exercise Science 11(1): 648-656, 2018. Body armor is essential to the protection of military personnel; however, body armor may impede the users balance and movement quality. A better understanding of the influence of body armor on balance and movement quality may help in the development of new guidelines for training standards and procedures to mitigate the risk of injury associated with wearing of body armor in warfighters. The purpose of this study was to identify the effects of body armor (combat boots, tactical vest and combat helmet) on balance and movement quality in male military cadets and …

Mindfulness And Affective Responses To Treadmill Walking In Individuals With Low Intrinsic Motivation To Exercise, Anne E. Cox, Madeline A. Roberts, Hailey L. Cates, Amanda K. Mcmahon

International Journal of Exercise Science

International Journal of Exercise Science 11(5): 609-624, 2018. An aversion to the sensations of physical exertion can deter engagement in physical activity. This is due in part to an associative focus in which individuals are attending to uncomfortable interoceptive cues. The purpose of this study was to test the effect of mindfulness on affective valence, ratings of perceived exertion (RPE), and enjoyment during treadmill walking. Participants (N=23; M_age=19.26, SD = 1.14) were only included in the study if they engaged in no more than moderate levels of physical activity and reported low levels of intrinsic motivation. …

Crae Training Reduces Insulin Resistance And Central Adiposity In Obese Adolescent Females, Rebecca Cuthbert

UNO Student Research and Creative Activity Fair

CRAE Training Reduces Insulin Resistance and Central Adiposity in Obese Adolescent Females

Rebecca Cuthbert, Leena P Bharath, William W Choi, Jae-min Cho, Alexus A Skobodzinski, Alexei Wong, Ty E Sweeney, Dustin Slivka, Song-Young Park University of Nebraska at Omaha, Omaha, Nebraska

Exercise training is recommended for maintaining health and reducing the risks of developing metabolic and cardiovascular pathologies. Combined resistance and aerobic exercise (CRAE) training has been utilized to decrease metabolic risk factors in obese adults. PURPOSE: To determine the effects of CRAE on obese adolescent females with hyperinsulinemia. METHODS: Forty obese adolescent females aged 14.7 ± 1 years (BMI …

Time Course Toward Baseline Of Hand-To-Foot Bia Measures Following An Acute Bout Of Aerobic Exercise, Brett S. Nickerson

International Journal of Exercise Science

International Journal of Exercise Science 11(2): 640-647, 2018. The purpose of this study was to determine the time course of BIA-derived body fat percentage (BF%) and total body water (TBW) values in the 1 h following a moderate bout (60% heart rate reserve [HRR]) of steady state aerobic exercise in apparently healthy men. College-aged adult males (n=15) had their BF% and TBW estimated via BIA before (PRE), immediately (IP), 10 min (10P), 20 min (20P), 30 min (30P), 40 min (40P), 50 min (50P), and 60 min (60P) post a 30 min bout of moderate treadmill exercise. Exercise intensity was …

A Description Of Physical Activity Outcomes During Beginning Curling, Britton Johnson, Alyssa Vanbelkum, Justin Kraft

International Journal of Exercise Science

International Journal of Exercise Science 11(6): 633-639, 2018. Identifying and promoting activities which enable participants to meet exercise guidelines is important for promoting a healthy society. The purpose of this study was to describe activity levels of novice participants during participation in the sport of curling. Participants included 29 novice curlers who were either enrolled in a beginning curling class at a local university or novice members in a city-wide curling league. The average exercise duration was 81.3 ± 19.8 minutes and variables monitored included heart rate (HR), steps, and estimated METs. Results indicated an average HR: 106 ± 12 …

The Effect Of The Menstrual Cycle On The Reliability Of Contact-Electrode Bioelectrical Impedance Analyzers, Emily A. Cumberledge, Cassandra Myers, Jennifer J. Venditti, Curt B. Dixon, Joseph L. Andreacci

International Journal of Exercise Science

International Journal of Exercise Science 11(4): 625-632, 2018. Bioelectrical impedance analysis (BIA) is a noninvasive and relatively inexpensive method of assessing body composition. Manufacturers of BIA technology recommend to avoid testing women when they perceive to be retaining water during the menstrual cycle. The purpose of the present investigation was to examine the effect of the menstrual cycle on body composition determined by contact-electrode BIA analyzers. Forty-three college-aged women volunteered to participate in this study (age=21.2 ± 1.1 years; body mass index = 24.0 ± 3.7 kg/m²). Subjects had their body composition assessed using four different contact-electrode BIA …

Evaluating Energy Expenditure Estimated By Wearable Technology During Variable Intensity Activity On Female Collegiate Athletes, Monica Taylor, Elizabeth Nagle, Fredric Goss, Elaine Rubinstein, Andrew Simonson

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 598-608, 2018. Monitoring an athlete’s energy intake and energy expenditure (EE) is an important consideration of nutritional planning for sport conditioning and peak performance. In order to provide appropriate recommendations regarding nutritional requirements and caloric needs, an accurate determination of energy requirements is necessary. By knowing an individual’s EE, a coach, athletic performance staff or trainer can effectively determine training loads and volumes necessary for periodization and seasonal planning for a particular sport. The purpose of this study is to examine the accuracy of the BodyMedia Mini armband while measuring EE in female basketball …

Examination Of Resistance Settings Based On Body Weight For The 3-Minute All-Out Critical Power Test, Marlene J. Schulte, Jody L. Clasey, Bradley S. Fleenor, Haley C. Bergstrom

International Journal of Exercise Science

International Journal of Exercise Science 11(4): 585-597, 2018. There are conflicting suggestions regarding the most valid resistance (3-5% of body weight) to use for the critical power (CP) 3-min all-out (CP_3min) test to estimate CP and anaerobic work capacity (AWC). The purpose of this study was to determine if the CP and AWC estimates from the CP_3min test were affected by the percentage of body weight used to set the resistance on a Monark cycle ergometer. Ten recreationally trained participants (mean ± SD: Age: 22.2 ± 2.2 yrs.) completed the CP_3min test at resistances of 4.5% …

Congruent Accuracy Of Wrist-Worn Activity Trackers During Controlled And Free-Living Conditions, Christopher J. Dondzila, Colleen Lewis, Justin R. Lopez, Tonya Parker

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 575-584, 2018. To examine activity tracker accuracy for measuring steps, energy expenditure, and heart rate in controlled and free-living conditions. Forty participants performed four, five-minute stages (walking: 53.7 m∙min-1, 80.5 m∙min-1; running: 134.1 m∙min-1, 160.9 m∙min-1) while wearing the Fitbit Charge HR (FB) and the Mio FUSE (MF) activity trackers. Measurements included steps, energy expenditure (kcals), and heart rate (beats∙min-1). In addition to the FB and MF, participants wore the NL-1000 (NL) activity tracker during waking hours of the subsequent day. One way ANOVAs with Tukey’s post hoc analyses were performed to compare mean …

Behavior Change Techniques And Physical Activity Using The Fitbit Flex®, Emily E. Dunn, Jennifer Robertson-Wilson

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 561-574, 2018. Due to the availability of low-cost accelerometers, there has been an increase in the adoption of physical activity monitors (e.g., Fitbit®) (14) accompanied by a desire to understand the behavior change techniques (BCTs; 15) present in such monitors. One specific Fitbit® monitor incorporates 20 BCTs (15), but how users experience these BCTs has yet to be explored. The purpose of this study was to explore user’s experience with the Fitbit Flex® regarding physical activity behavior and BCTs. The specific research objectives were to: 1) describe Fitbit Flex® users and 2) explore user’s …

Validation Of Piezorx Pedometer Derived Sedentary Time, Katelynn Donahoe, Dany Macdonald, Mark Tremblay, Travis Saunders

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 552-560, 2018. Although pedometers are valid tools for measuring physical activity, to date they have not been used to assess sedentary time. The primary purpose of this study was to determine if the PiezoRx pedometer is a valid and reliable measure of sedentary time compared to the hip-worn Actical accelerometer. A secondary purpose was to compare sedentary time derived via the Fitbit Flex with that of the Actical. Finally, a third purpose was to compare sedentary time derived from the above devices, with that of the ActivPAL inclinometer. Thirty-five participants ages 11-69 years (M …

Validation Of The Piezorx® Step Count And Moderate To Vigorous Physical Activity Times In Free Living Conditions In Adults: A Pilot Study, Myles W. O'Brien, William R. Wojcik, Lisette D' Entremont, Jonathon R. Fowles

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 541-551, 2018. The purpose of the study was to: 1) Validate the PiezoRx® for steps and intensity related physical activity in free-living conditions compared to the criterion measure. 2) Compare PiezoRx®’s steps and intensity related physical activity to physiological assessments. 3) To assess the utility of the PiezoRx® in a subsample of participants. Thirty-nine participants consisting of 28 females aged 54.9±10.6 (33-74) years and 11 males aged 63.9±10.9 (44-80) years wore the PiezoRx® physical activity monitor and the ActiGraph® accelerometer for one full week and completed a physical assessment. A subsample (n=24) wore the …

The Accuracy And Validity Of Ios-Based Heart Rate Apps During Moderate To High Intensity Exercise, Alexa M. Bouts, Lauren Brackman, Elizabeth Martin, Adam M. Subasic, Edward S. Potkanowicz

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 533-540, 2018. People use their smartphones for everything from web browsing to tracking fitness metrics. However, it is unclear whether smartphone-based apps that use photoplethysmography to measure heart rate are an accurate or valid measure of exercise intensity. Purpose was to determine the accuracy and validity of two iOS-based heart rate monitors, Runtastic Heart Rate Monitor and Pulse Tracker PRO by Runtastic (Runtastic) and Instant Heart Rate+: Heart Rate and Pulse Monitor by Azumio (Instant Heart Rate), when compared to the electrocardiogram (ECG) and Polar® T31 uncoded heart rate monitor from moderate to vigorous …

A Descriptive Study Of Objectively Measured Pokémon Go Playtime In College Students, Charles J. Fountaine, Emily J. Springer, Jasmine R. Sward

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 526-532, 2018. Since its debut in July 2016, Pokémon GO has been a wildly popular mobile gaming app. In contrast to many previous apps, Pokémon GO requires the user to be physically active. However, the extent to which Pokémon GO contributes to physical activity is unknown. Therefore, the purpose of this study was to investigate the physical activity profile of playing Pokémon GO for 60 minutes in recreationally active college students. College students (n=27, n=19 female) were fitted with an accelerometer, pedometer, and heart rate monitor to assess the activity demands during a 60-min …

Intraindividual Variability And Validity In Smart Apparel Muscle Activity Measurements During Exercise In Men, Jonathan Aquino, Jenevieve L. Roper

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 516-525, 2018. The purpose of the study was to compare smart apparel (SA) muscle activity measurements to surface electromyography (sEMG) muscle activity measurements during exercise, and determine if any systematic bias of the apparel exists. Thirty-five male participants (Ages 23.1±2.92 yrs, height 178±0.09 cm, mass 81.14±10.59 kg, body fat percentage 15.4±4.79%) provided informed consent for participation. During two separate exercise sessions, participants performed three sets of 12 bodyweight squats and pushups in both SA and sEMG. Conditions (sEMG or SA) were randomly counterbalanced. During sEMG, sensors were placed at selected anatomical locations on the …

Current State Of Commercial Wearable Technology In Physical Activity Monitoring 2015-2017, Jennifer Bunn, James W. Navalta, Charles J. Fountaine, Joel Reece

International Journal of Exercise Science

International Journal of Exercise Science 11(7): 503-515, 2018. Wearable physical activity trackers are a popular and useful method to collect biometric information at rest and during exercise. The purpose of this systematic review was to summarize recent findings of wearable devices for biometric information related to steps, heart rate, and caloric expenditure for several devices that hold a large portion of the market share. Searches were conducted in both PubMed and SPORTdiscus. Filters included: humans, within the last 5 years, English, full-text, and adult 19+ years. Manuscripts were retained if they included an exercise component of 5-min or greater and …

Effect Of An 8-Week Eccentric Training Program On Strength And Balance In Older Adults, Samantha Johnson

International Journal of Exercise Science

International Journal of Exercise Science 11(3): 468-478, 2018. The purpose of the current study was to determine changes in balance and strength following an eccentric resistance training program in community-dwelling older adults who reported no history of falling. Participants (N = 14, 8 female, 6 male; age = 63.5 ± 2.0 years) completed an 8-week eccentric exercise training intervention on a commercially available eccentric step machine. Training included 2 training sessions per week, with a duration of 5 to 10 minutes and an intensity of 30 to 50% maximal eccentric strength. Single leg stance, 30-second repeated chair stand, timed …

The Relationship Between Athlete Identity And Career Exploration And Engagement In Division Ii Athletes, Jade M. Bell, Steven Prewitt, Vipa Bernhardt, Dean Culpepper

International Journal of Exercise Science

International Journal of Exercise Science 11(5): 493-502, 2018. There are over 480,000 individuals who compete under the governing of the National Collegiate Athletic Association (NCAA) but only a few of these student athletes continue to compete after college. The aim of this study was to assess whether there is an association between athlete identity and career exploration and engagement among current student athletes. Student athletes (N = 44) from various National Collegiate Athletic Association Division II institutions in the Southwest United States participated in the study. Participants were asked to complete an online survey consisting of demographic questions, the …

Effect Of Magnesium Carbonate Use On Repeated Open-Handed And Pinch Grip Weight-Assisted Pull-Ups, Nicholas T. Bacon, Greg A. Ryan, Jonathan E. Wingo, Mark T. Richardson, Tracey Pangallo, Phillip A. Bishop

International Journal of Exercise Science

International Journal of Exercise Science 11(4): 479-492, 2018. The purpose was to determine if pull-up performance was affected by the use of chalk (100% magnesium carbonate) during open-handed and pinch grip weight-assisted pull-ups (WAPU) in recreationally-trained rock climbers. Furthermore, the reliability of open-handed and pinch grip WAPU was also investigated. Recreationally-active volunteers (n = 9) completed six counterbalanced trials. Participants used chalk during four trials to determine the reliability (test-retest) of the open-handed and pinch grips. While two of the six trials were used to determine if open-handed and pinch grip WAPU performance was affected without using chalk. Three of …

Effects Of A 60 Minute On Ice Game Simulation On The Balance Error Scoring System, Philip Cameron, Noelle C. Soltero, Justin Byers

International Journal of Exercise Science

International Journal of Exercise Science 11(6): 462-467, 2018. Mild traumatic brain injuries (mTBIs) are common in contact sports. There is an association between mTBIs and altered motor function. BioSway technology measures individuals’ balance using the Balance Error Scoring System (BESS). Prior to incorporating BESS testing in concussion protocol, other variables that influence the BESS test require review. The objective of this study is to determine if game fatigue in hockey players also influences the BESS score. 23 male (21.08 ± 1.09) National Collegiate Athletic Association (NCAA) athletes were tested using the BioSway™ (Biodex, USA). The BESS test measures the Sway …

An Evaluation Of Select Physical Activity Exercise Classes On Bone Metabolism, Tori M. Stone, Jonathan E. Wingo, John C. Young, James W. Navalta

International Journal of Exercise Science

International Journal of Exercise Science 11(2): 452-461, 2018. Weight-bearing physical activity can optimize bone mass early in life and prevent the development of osteoporosis. However, less is known about the potential benefits of non-weight-bearing activities. The purpose of this study was to assess the efficacy of structured physical activity classes on bone metabolism. Twenty-eight premenopausal women, aged 18–35 years who were either enrolled in a yoga class (n=14) or cardio-kickboxing class (n=14) voluntarily consented to participate. Both classes were introductory classes meeting twice per week for 50 min per session for 12 weeks. Anteroposterior spine (L1-L4), hip (dual femur), and …

Weekly Salivary Biomarkers Across A Season For Elite Men Collegiate Basketball Players, Matthew J. Andre, Andrew C. Fry, Paul E. Luebbers, Andrea Hudy, Patricia R. Dietz, Glenn J. Cain

International Journal of Exercise Science

International Journal of Exercise Science 11(6): 439-451, 2018. The purpose of this study was to monitor weekly the salivary free testosterone (FT), cortisol (C), and the FT/C ratio in elite men NCAA Division I basketball athletes across an entire season. Twelve athletes gave salivary samples for 30 consecutive weeks, beginning in the pre-season and ending one week after the end of post-season competition. Samples were assayed for FT and C. Additionally, a composite value (CBD) composed of Z-scores for weekly practice minutes, game minutes, resistance training repetitions, academic demands, and travel schedules was determined. One-way RM ANOVAs were used to …

Comparison Of Techniques For Tracking Body Composition Changes Across A Basketball Season, Ashley Ploudre, Jerry Mayhew

International Journal of Exercise Science

International Journal of Exercise Science 11(4): 425-438, 2018. Body composition assessment has become an integral part of athletes’ training schedules. Questions remain concerning the accuracy of various methods to track body composition changes over a competitive year cycle. The purpose of this study was to compare various methods of tracking body composition across a college women’s basketball season. Fourteen Division II women (age = 20.1 ± 1.2 y) were measured prior to the season (T1), after pre-season conditioning (T2), at mid-season (T3), and at the end of the season (T4) using skinfolds (SKF), two bioelectric impedance analysis (BIA) devices, and …

External Feedback Does Not Affect Running Pace In Recreational Runners, Nicholas A. Puleo, Kirk A. Abraham

International Journal of Exercise Science

International Journal of Exercise Science 11(5): 384-390, 2018. Many runners receive external feedback, such as running pace, during training; however, it is unknown if this feedback increases the intensity of a given exercise session. Therefore, the purpose of this study was to examine the effect of the provision of pace feedback on self-selected submaximal running pace, heart rate, and perceived exertion in recreational runners. Ten runners (6 female, 4 male) completed four 30-min treadmill running bouts in random order, each on a separate day. In each session, participants adjusted their pace as desired; however, all treadmill display information was concealed …

Comparison Of Body Composition Measurements In Lean Female Athletes, Carly L. Houska, Jessica D. Kemp, Jamal S. Niles, Amy Morgan, Robin M. Tucker, Mary-Jon Ludy

International Journal of Exercise Science

International Journal of Exercise Science 11(4): 417-424, 2018. This study compared body composition measurements in lean female athletes. The primary objective was to compare the accuracy of percent body fat (%BF) determined by bioelectrical impedance analysis (BIA), air-displacement plethysmography (ADP), and underwater weighing (UWW) in female Division I cheerleaders (n = 10 bases, 6 back-spots, and 12 flyers) from two universities. The secondary objective was to compare health risk predicted by %BF to body mass index (BMI) categorizations. UWW was considered the gold standard for assessing %BF. Pearson correlation coefficients were used to determine associations between methods. Repeated measures …

Association Between Different Non-Invasively Derived Thresholds With Lactate Threshold During Graded Incremental Exercise., Conor J. Raleigh, Bernard Donne, Neil Fleming

International Journal of Exercise Science

International Journal of Exercise Science 11(4): 391-403, 2018. We compared lactate threshold (T_Lac)with non-invasive markers of an aerobic-anaerobic transition; namely, ventilatory (VT) and tissue saturation index (TSI_T) thresholds. While identification of a breakpoint in blood lactate concentration ([BLa]) is common for determination of an aerobic-anaerobic transition, non-invasive measures, VT and NIRS, have also received attention as a means of determining this critical exercise intensity. We hypothesised that one or other of these non-invasive measures would have a strong association with T_Lac. Thirty-one (n=31) competitive male athletes (mean ± SD, age 29±9 yr, height 1.81±0.1 …

Comparison Of A Pneumatic Compression Device To A Compression Garment During Recovery From Doms, Molly Winke, Shelby Williamson

International Journal of Exercise Science

International Journal of Exercise Science 11(3): 375-383, 2018. The purpose of this study was to determine the effects of a pneumatic compression device (PCD) compared to a continuously-worn compression sleeve (CS) during a five-day recovery period from delayed-onset muscle soreness (DOMS) of the elbow flexors. Eight college-aged students participated in this crossover design study. The muscle-damage protocol consisted of four sets of 25 repetitions of isokinetic concentric elbow flexion followed by eccentric elbow extension at 60 ^o/second. Immediately following the muscle-damage protocol, subjects either wore a CS continually for five days or completed daily, 20-minute PCD treatments for five …

The Effect Of Acute L-Carnitine And Carbohydrate Intake On Cycling Performance, Boe M. Burrus, Brian M. Moscicki, Tracey D. Matthews, Vincent J. Paolone

International Journal of Exercise Science

International Journal of Exercise Science 11(2): 404-416, 2018. Chronic supplementation of L-carnitine and carbohydrate has been reported to increase L-carnitine content in skeletal muscle and have positive influences on exercise variables and performance. This study investigated the acute intake of L-carnitine and carbohydrate on the exercise parameters of cycling. A total of 10 males (27.0 ± 4 years) completed two exercise sessions consisting of 40 min of cycling at 65% of VO_2peak, followed by cycling to exhaustion at 85% of VO_2peak. L-carnitine or a placebo was consumed 3 hours prior to exercise, and beverages consisting of …

Global Active Stretching (Sga®) Practice For Judo Practitioners’ Strength Enhancement, Heleno Almeida Jr., Raphael F. De Souza, Felipe J. Aidar, Alisson G. Da Silva, Ricardo P. Regi, Afranio A. Bastos

International Journal of Exercise Science

International Journal of Exercise Science 11(6): 364-374, 2018. In order to analyze the Global Active Stretching (SGA®) practice on the physical performance enhancement in judo-practitioner competitors, 12 male athletes from Judo Federation of Sergipe (Federação Sergipana de Judô), were divided into two groups: Experimental Group (EG) and Control Group (CG). For 10 weeks, the EG practiced SGA® self-postures and the CG practiced assorted calisthenic exercises. All of them were submitted to a variety of tests (before and after): handgrip strength, flexibility, upper limbs’ muscle power, isometric pull-up force, lower limbs’ muscle power (squat-jump – SJ and countermovement jump – CMJ) …