Health and Physical Education Commons^™

Lifting In An Alternate Reality: The Application Of Action Observation Within Virtual Reality And Weightlifting., Michael Weise, Nikko Cando, Alex Krause, Kim Hernandez, Rabbani Nzeza, Allyssa Alcasabas, Jake Hinkel-Lipsker

International Journal of Exercise Science: Conference Proceedings

Action observation (AO), where a learner watches a model perform a skill, has long been shown to facilitate motor learning of a variety of skills. There is great interest in learning ways to optimize the AO experience in order to maximize motor learning. In recent years, virtual reality (VR) technology has advanced considerably, where high-fidelity environments can facilitate a fully immersive experience. As such, the three-dimensional (3D) VR experience could allow for improved learning through AO over more traditional forms (e.g., watching a computer screen). PURPOSE: The purpose of this study is to determine how well people learn a …

Obstacle Negotiation Gaze Strategies Of The Physically Fatigued, Belle P. Ponce De Leon, Makena Savola, Sedona Boren, Andrew Fishman, Sarika Varma, Jacob W. Hinkel-Lipsker

International Journal of Exercise Science: Conference Proceedings

INTRODUCTION: Proper obstacle negotiation while in a fatigued state is a safety concern for first responders, firefighters and other primary relief personnel in their high-risk line of work. During locomotion the central gaze is focused beyond the obstacle to plan future steps while the peripheral vision spatially tracks the obstacle. Previous work indicates that following intense exercise people experience a narrowed peripheral visual field, making them more reliant on central gaze. Thus, it is possible that when physically-fatigued people become more reliant on central gaze to perceive obstacles, leaving them unable to plan future steps as effectively.

PURPOSE: This study …

The Impact Of Anterior Cruciate Ligament Injury Risk On Baseline Balance Assessment For Concussion In Collegiate Athletes, Ryan N. Moran, Nicholas G. Murray

International Journal of Exercise Science: Conference Proceedings

PURPOSE: Recent literature has linked concussion and neuromuscular deficits in the lower extremity after injury. Neuromuscular control is frequently assessed using balance measures for concussion, but also dynamically to identify anterior cruciate ligament injury (ACL) risk via jump-landing movement screening. The purpose of this study was to examine the impact of ACL injury risk on baseline balance assessment for concussion. METHODS: Thirty-nine healthy, collegiate female soccer (n=22) and volleyball (n=17) athletes completed the modified-Clinical Test of Sensory Interaction of Balance (m-CTSIB) and the Landing Error Scoring System (LESS) test as part of routine concussion baseline testing and injury …

Effects Of Short Foot Exercise On Ankle Eversion Velocity, Daniel Metri, Jacob Mayoral, Connor Owen, Andy Arant, Dane Johnson, Robert Dudley, Andrea Du Bois

International Journal of Exercise Science: Conference Proceedings

The biomechanical position of the foot while landing plays a major role in performance and injury. A common issue of landing is excessive foot pronation and subsequently ankle eversion. This biomechanical position can result in knee abduction, increasing the chance of knee injury. The velocity at which the ankle everts may also be a component of injury as long distance runners that became injured had higher ankle eversion velocity in their landing strides while running. Short foot exercise (SFE) strengthens the intrinsic muscles of the foot and help stabilize the arch which assists in eccentrically controlling pronation. However, acute effects …

Uphill, Level, And Downhill Running In A New Style Of Road-Racing Shoe, Hunter Mcwilliams, Iain Hunter, Jared Ward, Cal Bradshaw, Tyler Standifird

International Journal of Exercise Science: Conference Proceedings

Recent changes in road-racing shoe construction has prompted research comparing the metabolic benefit of new shoe constructions compared to older styles. Kinematic and kinetic changes with uphill and downhill running may affect the magnitude of benefit for this new style of racing shoe. PURPOSE: Due to the changes associated with downhill running, we hypothesize that new performance racing shoes will have a greater metabolic benefit when running downhill, than with level or uphill running. METHODS: Eighteen subjects (10 men and 8 women) ran on two separate days with shoe order reversed. They wore either the Saucony Type A …

The Effect Of The Short Foot Exercise On The Knee During Landing, Jacob G. Mayoral, Connor Owen, Daniel Metri, Andy Arant, Dane Johnson, Robert Dudley, Andrea Du Bois

International Journal of Exercise Science: Conference Proceedings

Intrinsic foot muscles play an important role in the stabilization of the foot and assist with pronation of the foot. Excessive eversion, a component of pronation, may carry up the kinetic chain to impact the knee’s frontal plane position, increasing the chance of a knee injury. Runners who go on to sustain injuries have a greater peak knee abduction moment during running than those without injury. Regular short foot exercise (SFE) strengthens the intrinsic foot muscles, which over time could help improve foot posture and mechanics up the kinetic chain. It is unclear if a single bout of SFE can …

Short-Term Effects Of Exercise On Grip And Pinch Strength, Kristen Lantis, Deanna J. Schmidt

International Journal of Exercise Science: Conference Proceedings

PURPOSE: Occupations such as first responders and military may require use of hand and finger muscles after exercise, therefore changes in grip strength (GS) and pinch strength (PS) could affect task performance. While previous studies have shown decreases in GS with load carriage, others have shown increases in GS with other forms of exercise. The purpose of this study is to examine the short-term changes in GS and PS with exercise and load carriage. METHODS: Seven participants to date (5 male, 2 female; mean ± SD of 25.1 ± 4.5 yrs, 176.9 ± 11.9 cm height; 80.6 ± …

Angular Impulse Of The Whole Body During American Football Long Snapping, Janelle J. Kim, Travis J. Peterson

International Journal of Exercise Science: Conference Proceedings

Long snapping is found in American football, and the goal is to have the ball reach the punter as quickly and accurately as possible so they can kick the ball downfield with minimal interference from the opposing team. Little research has been performed on the whole body kinetics of long snapping. PURPOSE: To describe the differences in angular impulse between high school and college athletes during the act of long snapping. METHODS: This study compared high school long snappers (n=5) and college long snappers (n=5). Whole group average age (18.9 ± 1.3 years), years of long snapping experience …

A Case Study Comparison Of Lower Extremity Kinematics In Medial Tibial Stress Syndrome, Amanda Hernandez, Patricia Vanoosbree, Kristyne Wiegand

International Journal of Exercise Science: Conference Proceedings

Medial tibial stress syndrome (MTSS) affects up to 35% of runners. Chronic MTSS can negatively affect performance or lead to a cessation of activity. Though biomechanical variables such as hip internal rotation, tibial abduction, and rearfoot eversion are considered potential risk factors for MTSS, the research is equivocal. PURPOSE: Therefore, the purpose of this case analysis is to compare lower extremity kinematics of a D3 middle-distance runner with chronic MTSS vs. a matched uninjured runner. METHODS: This case study consists of two female middle-distance runners. Participant one (19 y.o., 1.73 m, 70.3 kg) experienced intermittent MTSS for 4 years. …

Quality Of Knee Strengthening Exercises Performed At Home Deteriorates After One Week, Hayden E. Dennis, Hyunwook Lee, Ulrike Mitchell, M. K. Seeley

International Journal of Exercise Science: Conference Proceedings

Current clinical practice guidelines for physical therapy (PT) post-total knee arthroplasty (TKA) recommend supervised postoperative PT; this recommendation is based on research demonstrating that more direct supervision from a physical therapist yields improved mobility, balance, and overall quality-of-life, relative to less supervision. Supervised post-operative PT is not always feasible due to non-availability of a licensed physical therapist, lack of health insurance, and/or other factors. Consequently, patients often perform post-TKA PT exercises without supervision. PURPOSE: To compare the quality (determined via the ability to replicate lower extremity kinematics recommended by a physical therapist) of post-TKA PT exercises in healthy older …

Electromyographic Analysis Of The Vastus Lateralis And Vastus Medialis Muscles Among Different Crank Lengths In Cycling, Jackson C. Crovella, Karoline M. Wucherer, Joy He, Christiane R. O'Hara

International Journal of Exercise Science: Conference Proceedings

Crank length (CL) on a bicycle may influence the total activation and period of activation of the leg muscles. Differences in total muscular activation suggest that CL may alter muscular fatigue. Differences in muscular onset and offset suggest that CL may shift muscle activation periods across a 360 degree crank cycle. PURPOSE: To examine the effects of four different CL (155, 165, 175, and 185 mm) on muscular activation of vastus lateralis (VL) and vastus medialis (VM). METHODS: Nine non-cyclists (6M, 3F, aged 18-55) participated in a single blind randomized cross-over experiment with four CL. Delsys EMG sensors …

Effects Of An Achilles Speedbridge On Ankle Joint Motion: A Case Study, Alfredo Cervantes, Kevin Valenzuela, Justin Demoss, Anaya Blade, Hunter J. Bennett

International Journal of Exercise Science: Conference Proceedings

Over 80% of Achilles injuries are related to individuals who participate in sports or recreational activities that involve either jumping or running. Current research does not provide insight into the longitudinal recovery effects following an Achilles repair surgery. PURPOSE: To evaluate the longitudinal effects of lower extremity kinematics following an Achilles Speedbridge surgery. METHODS: A 35-year-old male (1.85m, 86.4kg) presented right Achilles insertional tendinitis and a large retrocalcaneal bone spur which had fractured and was partially embedded in the Achilles tendon. One week prior to operation the subject completed over ground walking trials at 1.0 m/s velocity. Following …

Short-Duration Massage Does Not Affect Grip Strength In Rock Climbers, Tayler Ah Nee, Christopher Berger

International Journal of Exercise Science: Conference Proceedings

Handgrip strength (HGS) is now viewed as an index of overall health and may even be prognostic for conditions that include cancer and cardiovascular disease. Consequently, it is important to understand influences on HGS, one of which may be forearm massage. PURPOSE: The aim of this study was to test the hypothesis that a bout of short-duration massage would augment HGS in rock climbers, a population for which massage is commonly employed and HGS is acutely important. METHODS: Subjects included fifteen female (age 28 ± 7 yr; height 165.8 ± 5.5 cm; weight 63.1 ± 11.7 kg) and fifteen …

Crossing Over To The Other Side; Studying Effect Of Fatigue When Walking In A Randomized & New Space, Joshua A. Vicente, Alex X. Krause, Yesenia Acosta-Marin, Ephraim Flores, Jaesung Joo, Jacob W. Hinkel-Lipsker

International Journal of Exercise Science: Conference Proceedings

Slips, trips, and falls (STFs) that lead to a substantial amount of workplace injuries. In any career that requires physical effort, it is crucial to maintain a strong reaction and response time to these unpredictable environments to maintain worker safety. In dynamic, ever-changing workplaces, it is important to know how to best mitigate trip and fall risk. However, there is little literature describing how physical fatigue affects young, healthy individuals’ ability to negotiate obstacles, as well as whether there are worker characteristics that may put them at greater risk of STFs.

PURPOSE: Therefore, our purpose is to identify the …

Biomechanical Changes In Running Post-Transition In A Triathlon, Luke Vankeersbilck, Travis Peterson Phd

International Journal of Exercise Science: Conference Proceedings

Triathletes often complain about lower limb discomfort when running after cycling (Quigley, 1996). Several studies have found differences in muscle activation (Chapman, 2009), kinematics (Rendos et al., 2013), and kinetic cost (Millet, 2001) during the transition run. These differences were also found to be more severe in less experienced triathletes (Chapman, 2008). PURPOSE: This study aimed to determine the kinetic differences between baseline and transition runs of inexperienced triathletes. METHODS: Twelve novice triathletes age: 29.4 ± 12.15 y, mass: 71.2 ± 10.3 kg, weekly running mileage: 24.4 ± 16.7 mi/week volunteered to participate. Athletes completed a 20 min …

Influence Of Sleep Disturbances On Landing And Jumping Forces In Elite College Age Individuals, Spencer Rasmussen, Caitlyn Stainbrook, Emily Sullenger, Shane Draper, Andrew Creer, Tyler Standifird

International Journal of Exercise Science: Conference Proceedings

BACKGROUND: Sleep has been demonstrated to influence sport-specific performance in college athletes with sleep deprivation decreasing sport-specific performance and possibly leading to greater risk of injury (Reyner & Horne, 2013). Jumping and landing are important movements in many sports, therefore, sleep disturbances could potentially increase the risk of injury in sports with jumping and landing movements.

PURPOSE: The intent of this study was to determine if sleep disturbances influence forces produced during jumping and landing in elite college age individuals.

METHODS: Twenty-five UVU athletes (males=8, females=17) completed the Morningness-Eveningness Questionnaire (MEQ) and the Pittsburgh Sleep Quality Index Questionnaire (PSQI) before …

The Effects Of Short Foot Exercise On Ground Reaction Forces During Landing, Connor M. Owen, Daniel Metri, Jacob Mayoral, Andy Arant, Dane Johnson, Robert Dudley, Andrea Du Bois

International Journal of Exercise Science: Conference Proceedings

The foot is a shock absorber which helps attenuate loads during landing activities via pronation. Intrinsic foot muscles help stabilize the arch of the foot and assist in controlling pronation. Excessive pronation during landing may transfer up the kinetic chain, increasing the risk of knee injury. Additionally, increased ground reaction forces (GRF) during landing may increase the risk for an ACL injury. Acute bouts of short foot exercise (SFE) can strengthen IFM, improving foot posture, balance, and energy transfer in dynamic activities, reducing injury risk. PURPOSE: Therefore, this study investigates whether SFE training before jump performance lowers GRF upon landing. …

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 …

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 …

The Effects Of Transcranial Direct Current Stimulation Of Dorsolateral Prefrontal Cortex Over Multiple Days On Shooting Performance In Elite Deaflympic Athletes: A Case Series, Nicholas Pudar, Milan Pantovic, Sheniz Mooney, Brach Poston

International Journal of Exercise Science: Conference Proceedings

Transcranial direct-current stimulation (tDCS) is a non-invasive brain stimulation method that has shown the ability to enhance motor learning in numerous studies. However, only a few of these studies have been conducted on elite level performers or in complex motor tasks that have been practiced extensively. Rifle shooting is a difficult motor task that has real-world implications in military, police, and sport settings. Although a few studies have investigated the influence of tDCS on shooting performance, these were all acute studies conducted on novice performers. The PURPOSE was to determine the effects of DLPFC-tDCS on motor learning over multiple days …

Paraspinal Muscle Fatigue Influences Trunk Kinematics During Single-Leg Drop Jump Landings, Natalie A. Delgadillo, Michael W. Olson

International Journal of Exercise Science: Conference Proceedings

Neuromuscular fatigue of the paraspinal muscles modifies kinematics responses to perturbations in controlled settings. PURPOSE: The purpose of this study was to assess trunk kinematics response during single-leg drop landings before and after induced neuromuscular fatigue of the low back muscles. METHODS: 13 male and female volunteers (22.3 ± 2.6 years, 1.66 ± 0.09m, 68.0 ± 14.0 kg) performed single-leg drop landings with their preferred leg from a 30 cm height before and after induced neuromuscular fatigue of the trunk. 3-D analysis of the trunk kinematics was performed using reflective spheres of 14 mm diameter. Maximum voluntary isometric contractions (MVIC) …

The Prevalence Of Mtss Symptoms Among Men And Women Ncaa Division Iii Student Athletes, Amanda Combs, Kristen Mcalexander

International Journal of Exercise Science: Conference Proceedings

Symptoms of Medial Tibial Stress Syndrome (MTSS) are common among athletes of various sports and levels, but studies describing the prevalence of MTSS symptoms are lacking. Possible contributing factors of MTSS include an individual’s flexor digitorum longus attachment and soleus muscle, a pronated foot, large loads of mechanical forces, large calf girth, and gender. No individual factor has been statistically associated with MTSS, and prevention and treatment are difficult to study. Further, no earlier studies have described the prevalence of MTSS symptoms for men and women NCAA student athletes among various sports. PURPOSE: To measure and describe MTSS symptoms among …

Manual Versus Semi-Automated Detection Of Muscle Fascicle Pennation Angle Of The Vastus Lateralis, Natalie Walker, Jesus Hernandez-Sarabia, Carlos Estrada, Jocarlo Shields, Rob Maclennan, Jason Defreitas, Scott Crawford, Micheal Luera

International Journal of Exercise Science: Conference Proceedings

Muscle pennation angle (PA) is a key characteristic in muscle function. However, current methodologies are tedious, time consuming, and usually only include a few representative fascicles for the PA measures. Leveraging image processing methods could improve the efficiency of PA measurements while still providing valuable insight into architectural changes during specific tasks. PURPOSE: To compare manual (MAN) versus semi-automated (SA) analyses for muscle PA within the vastus lateralis (VL) utilizing ultrasound images taken during isometric knee extensions at different intensities relative to maximum volitional effort. METHODS: Sixteen lower-body resistance trained males (n =7, mean ± SD; 21±7 yrs; 77.7 ± …

A Comparison Of Techniques For Decomposing Surface Electromyography Signals During High-Intensity Contractions A Preliminary Analysis, Lyric Richardson, Micheal Luera, Jocarol Shields, Rob Maclennen, Michael Trevino, Alessandro Delvecchio, Jason Defritas

International Journal of Exercise Science: Conference Proceedings

Advancements in surface electromyography (sEMG) have led to discrepancies in identification of high-threshold motor units (MU) following signal decomposition PURPOSE: To examine the differences in MU firing behaviors recorded from two separate sEMG sensors following respective decomposition analysis. METHODS: Following 2 maximal voluntary contractions (MVC), ten (23 ± 3 yrs.; 178.64 ± 5.82 cm; 177.8 ± 17.37 kg) lower body resistance trained males performed a 10 sec submaximal (50%) isometric ramp contraction of the knee extension exercise. Signals were recorded from the vastus lateralis and separately decomposed into their constituent MU action potential trains, then further validated for subsequent analysis …

Anthropometric Predictors Of Concentric Hip, Knee, And Ankle Work During A 5x5 Conventional Deadlift Routine, Dale S. Keith, Daniel Scherrer, Brandon Nunley, John R. Harry, Grant M. Tinsley

International Journal of Exercise Science: Conference Proceedings

The deadlift is one of the most commonly performed exercises to strengthen the lower body, as well as one of the main lifts in powerlifting and strongman competitions. However, literature exploring the deadlift exercise and its variations remains quite limited compared to other popular exercises like squats and bench press. PURPOSE: The purpose of this exploratory analysis was to determine if there are relationships between anthropometric characteristics (arm length, torso length, thigh length, and shank length) and hip, knee, and ankle joint angular concentric work during a 5 sets of 5 repetitions (5x5) conventional deadlift (CDL) routine. METHODS: …