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Full-Text Articles in Medical Education
Exploring The Effect Of Wilderness Backpack Configurations On Biomechanical And Electromyographic Variables, Kennedy C. Nelson, Cody Soo, Benjamin Mcconnell, Christiane R. O'Hara, Scott J. Hazelwood
Exploring The Effect Of Wilderness Backpack Configurations On Biomechanical And Electromyographic Variables, Kennedy C. Nelson, Cody Soo, Benjamin Mcconnell, Christiane R. O'Hara, Scott J. Hazelwood
International Journal of Exercise Science: Conference Proceedings
As the number of participants in both occupational and recreational wilderness activities increases, there is a growing need for preventative injury intervention. Hiking has been associated with elevated risk of injuries in the knees, lower back, and ankles; and hiking with a pack exacerbates those effects. PURPOSE: The aim of this study was to assess the effect of backpack type on several kinetic, kinematic, and EMG variables during a step-up motion. The dependent variables were specifically chosen for their documented correlation with injury susceptibility. The data were intended to provide insight on future assessment of pack design for both …
Ankle Joint Utilization Differences Between Dancers And Non-Dancers During Jumping Movement, Ricardo Tolentino, Elizabeth Reyes, Danielle Serrano, Eloisa Hernandez, Jennifer Camacho, Danielle N. Jarvis
Ankle Joint Utilization Differences Between Dancers And Non-Dancers During Jumping Movement, Ricardo Tolentino, Elizabeth Reyes, Danielle Serrano, Eloisa Hernandez, Jennifer Camacho, Danielle N. Jarvis
International Journal of Exercise Science: Conference Proceedings
Anterior cruciate ligament (ACL) injuries are common in sports, but dancers experience lower rates of ACL injuries compared to athletes in other team sports. While researchers have explored potential reasons for this occurrence, there has been limited research comparing bipedal jumping mechanics between dancers and other physically fit individuals. PURPOSE: To determine the kinematic and kinetic differences between dancers and non-dancers during sauté jumps and squat jumps. METHODS: Nineteen participants were involved in this study, with 10 dancers and 9 non-dancers, all of whom were equipped with reflective markers. A three-dimensional motion analysis was conducted using a …
Acute Effects Of Multi-Joint Eccentric Exercise On Lower Extremity Muscle Activation Measured During Land And Water Walking, Talin Louder, Brayden Worley, Brennan J. Thompson, Jon Carey
Acute Effects Of Multi-Joint Eccentric Exercise On Lower Extremity Muscle Activation Measured During Land And Water Walking, Talin Louder, Brayden Worley, Brennan J. Thompson, Jon Carey
International Journal of Exercise Science: Conference Proceedings
Aquatic walking combined with lower-body eccentric exercise provides a low-impact, time-efficient method for improving strength and mobility. While both modalities show promise individually, it is unclear if neuromuscular activation patterns during aquatic walking remain consistent following a short bout of submaximal eccentric exercise. PURPOSE: To compare lower-extremity muscle activation during walking performed in chest-deep water versus on land, before and after a short bout of eccentric exercise. METHODS: Twenty-six healthy, recreationally active young adults completed the study (male = 16; female = 10; age = 21.6 ± 2.5 years; height = 176.4 ± 6.9 cm; mass = 75.9 …
Comparative Analysis Of Electromyographic Signals Using Bursts And Epochs: Optimizing Measurement Accuracy And Reliability In Signal Processing, Anabel Groskopf, Cory M. Smith, Brent Alvar, Kristen Snyman
Comparative Analysis Of Electromyographic Signals Using Bursts And Epochs: Optimizing Measurement Accuracy And Reliability In Signal Processing, Anabel Groskopf, Cory M. Smith, Brent Alvar, Kristen Snyman
International Journal of Exercise Science: Conference Proceedings
Electromyography (EMG) is a tool for assessing muscle activity, yet methods for signal selection during dynamic muscle contractions remains unclear. PURPOSE: To compare dynamic EMG signals in single contraction BURSTS vs. multi-contraction time EPOCHs during non-fatiguing cycle ergometry. METHODS: 19 recreationally trained college-aged cyclists visited the lab on two separate occasions. The first visit included informed consent, familiarization, and the completion of a graded exercise test to determine VO2max, the gas exchange threshold (GET), Rating of Perceived Exertion (RPE) at GET, and power output associated with GET and VO2max. Participants returned to the lab 48 hr later to …
The Effect Of Anticipation On Limb Symmetry During The Landing Error Scoring System Test, Marisol Valenzuela, Monica X. Cortes, Luis J. Valadez, Dominick J. Cece-Sherley, Warren O. Forbes
The Effect Of Anticipation On Limb Symmetry During The Landing Error Scoring System Test, Marisol Valenzuela, Monica X. Cortes, Luis J. Valadez, Dominick J. Cece-Sherley, Warren O. Forbes
International Journal of Exercise Science: Conference Proceedings
The Landing Error Scoring System (LESS) is a field test consisting of a 17-item checklist that identifies the presence of biomechanical risk factors during a drop jump task that have been prospectively linked to non-contact lower extremity injuries. The standard LESS does not address limb differences or any element of anticipation that is often seen in the athletic settings. PURPOSE: The purpose of this study was to assess the influence of anticipation on limb symmetry during the landing error scoring system test. METHODS: All jumping trials were performed off a 30 cm platform into a marked area on the ground. …
The Effects Of Backwards Walking On Quadriceps Muscle Activation After Acl Reconstruction: A Pilot Study, Sophia M. Miller, Kevin Valenzuela, Reagan Recchia, Makana Woods, Alexa Johnson, Riann Palmieri-Smith
The Effects Of Backwards Walking On Quadriceps Muscle Activation After Acl Reconstruction: A Pilot Study, Sophia M. Miller, Kevin Valenzuela, Reagan Recchia, Makana Woods, Alexa Johnson, Riann Palmieri-Smith
International Journal of Exercise Science: Conference Proceedings
Quadriceps muscle activation is commonly decreased in persons after ACL reconstruction. Backwards walking has been studied as an intervention to improve quadriceps muscle strength for individuals with knee osteoarthritis. However, it is unknown if backwards walking could increase quadriceps muscle activation in persons with anterior cruciate ligament injuries. PURPOSE: The purpose of this study was to understand the effects of backwards walking on quadriceps muscle activity. METHODS: A single participant who had an ACL reconstruction (F, age: 21 yrs, time since surgery: 33 months) and a single healthy, uninjured control (F, age: 21) completed three walking trials each …
Effects Of Turnouts And Structure Boots On The Kinematics Of Firefighters During A Drop Landing, Edward Jabbour, Stevie Silvas, Maddie Cheaney
Effects Of Turnouts And Structure Boots On The Kinematics Of Firefighters During A Drop Landing, Edward Jabbour, Stevie Silvas, Maddie Cheaney
International Journal of Exercise Science: Conference Proceedings
Firefighters require the ability to perform under intense conditions involving challenging movements. Protective gear, such as turnouts and structure boots, plays an impactful role in protecting firefighters. Understanding how the gear influences movement is essential for improving their safety and performance. PURPOSE: This study aimed to analyze the effects of turnouts and structure boots on the sagittal plane ankle and knee kinematics of firefighters during a drop-landing. METHODS: Eleven healthy male firefighters participated. Retroreflective markers were attached to the subject's lower extremities to identify their anatomy and movement using a three-dimensional motion capture system. The subjects performed three …
Investigating The Effect Of Fat Bar Attachments On Peak Velocity, Repetitions Until Failure, Energy Expenditure, And Respiratory Quotient In The Bench Pull Exercise, Robert R. Sawyer, Shane Draper, Anthony Ciccone, Tyler Standifird, Nicolas Clark
Investigating The Effect Of Fat Bar Attachments On Peak Velocity, Repetitions Until Failure, Energy Expenditure, And Respiratory Quotient In The Bench Pull Exercise, Robert R. Sawyer, Shane Draper, Anthony Ciccone, Tyler Standifird, Nicolas Clark
International Journal of Exercise Science: Conference Proceedings
New methods of training in resistance exercise include the use of thick or “fat” bar attachments to promote forearm and grip strength. No study has investigated how these tools affect both acute biomechanical and physiological factors of barbell exercise. PURPOSE: Investigate the effect of using a thick barbell attachment (5.72 cm diameter) on peak velocity, repetitions until failure, total energy expenditure, and respiratory quotient during the bench pull exercise performed at 60% 1RM. METHODS: Six healthy resistance-trained college-aged men underwent three visits. First visit was used to calculate one-rep max (1RM) through force-velocity profiling. Second and third visits were randomized …
Investigation Into Chin-Force Of Violinists, Ciya Clyde, Miles Mercer, Julia Freedman Silvernail
Investigation Into Chin-Force Of Violinists, Ciya Clyde, Miles Mercer, Julia Freedman Silvernail
International Journal of Exercise Science: Conference Proceedings
Pain and discomfort have become a routine part of life for many orchestral musicians. Violinists in particular experience high number of injuries in their upper body, including the neck, shoulders, and arms. Force applied to the instrument at the chin provides the stabilization of the instrument required for performance but may contribute to these injuries. Due to the scarcity of research on musicians' physical health, it is challenging to determine the sources of musculoskeletal injuries in violinists. Nonetheless, examining the force applied at the chin could serve as a valuable starting point for investigation. PURPOSE: To investigate how chin-force is …
Pilot Study: The Effect Of Weight Belts And Lifting Straps On Conventional Deadlift Performance, Adam Zeidan, Christian Rogacion, Mason Caragao, Braeden Kraft, Kevin A. Valenzuela, Evan E. Schick
Pilot Study: The Effect Of Weight Belts And Lifting Straps On Conventional Deadlift Performance, Adam Zeidan, Christian Rogacion, Mason Caragao, Braeden Kraft, Kevin A. Valenzuela, Evan E. Schick
International Journal of Exercise Science: Conference Proceedings
Weight belts and lifting straps are frequently worn when performing deadlifts for their ergogenic advantages, but no prior research has examined their effects. Purpose: The pilot study investigated the effects of weight belts and lifting straps on deadlift performance variables. Methods: One male subject participated (age 26 years, 78kg, 1.73M) in four separate days, performing conventional deadlifts (CDL) under varying conditions. On day one, the subject performed the CDL without weight belts and lifting straps (RAW). The remaining sessions were randomized between using a weight belt only (BO), lifting straps only (SO), or both weight belt and lifting …
Differences In Joint Kinematics And Electromyography Activity Among The Conventional, Block, And Deficit Deadlifts, Christian R. Rogacion, Evan E. Schick, Joshua A. Cotter, Kevin Valenzuela
Differences In Joint Kinematics And Electromyography Activity Among The Conventional, Block, And Deficit Deadlifts, Christian R. Rogacion, Evan E. Schick, Joshua A. Cotter, Kevin Valenzuela
International Journal of Exercise Science: Conference Proceedings
The conventional deadlift (CDL) is a commonly used lower-body exercise that utilizes the legs, hips, back, and trunk muscles. The block deadlift (BDL) and the deficit deadlift (DDL) are two variations that alter the starting position and height of a deadlift, however, there is a lack of literature that examines both. PURPOSE: To quantify and compare joint kinematics and peak muscle activation differences between a CDL, BDL, and DDL. METHODS: Twenty total resistance-trained male and female participants (25.1 ± 3.6 yrs old, 81.0 ± 15.2 kg) performed a one-repetition maximum (1RM) in the CDL on day one. At …
The Influence Of Anticipation On Landing Error Scoring System Performance, Luis J. Valadez, Dominick J. Cece-Sherley, Marisol Valenzuela, Monica X. Cortes, Warren O. Forbes
The Influence Of Anticipation On Landing Error Scoring System Performance, Luis J. Valadez, Dominick J. Cece-Sherley, Marisol Valenzuela, Monica X. Cortes, Warren O. Forbes
International Journal of Exercise Science: Conference Proceedings
The Landing Error Score System (LESS) is a field assessment tool that can help identify biomechanics during a drop jump task that predispose an athlete to an increased risk of non-contact anterior cruciate ligament injury. While the LESS has shown to be valid and reliable, the pre-planned, anticipatory nature of the drop jump task during the LESS is not indicative of the movement strategies present in many sport settings. PURPOSE: The purpose of this study was to assess the influence of anticipation on landing error scoring system performance. METHODS: Twenty-two individuals participated in this study. Anticipated jumping trials consisted of …
Speed Has No Correlation To Muscle Volume Of Hip Flexors And Tibialis Anterior Muscles In Division L Football Athletes, Isaiah B. Guymon, Malorie Wilwand, Steven P. Allen, B. Brett Mortensen, Aaron W. Johnson
Speed Has No Correlation To Muscle Volume Of Hip Flexors And Tibialis Anterior Muscles In Division L Football Athletes, Isaiah B. Guymon, Malorie Wilwand, Steven P. Allen, B. Brett Mortensen, Aaron W. Johnson
International Journal of Exercise Science: Conference Proceedings
In American football (AF) a desirable trait is sprint speed that leads to success such as increased touchdowns, yards gained, and number of sacks. Researchers suggest training programs can improve an athletes’ sprint speed. Considering the swing to stance phases, the hip flexors (HF) and tibialis anterior (TA) may impact an athletes’ speed. The HF initiates the swing phase, while the TA muscle dorsiflexes the foot allowing the toes to clear the ground. PURPOSE: To determine if there is a correlation between collegiate football athlete's speed and the muscle volume (MV) of HF and TA muscles. METHODS: This study …
Downhill Dilemma: Analyzing Joint Force On Variable Speed And Gradient, Ulises Hernandez, Ezrie Pace, Kaeley Loader, Nathan Ramirez, Megan Nielsen, Michael Bohne
Downhill Dilemma: Analyzing Joint Force On Variable Speed And Gradient, Ulises Hernandez, Ezrie Pace, Kaeley Loader, Nathan Ramirez, Megan Nielsen, Michael Bohne
International Journal of Exercise Science: Conference Proceedings
Movement on declined slopes poses unique mechanical stresses when compared to level surfaces. Both downhill (DH) running and walking have seen large amounts of load force absorption on the knee (French 2018; Abe et.al., 2011) with some forces possibly being distributed to the hip and ankle joints. Though research is limited about lower extremity joint kinematics across all three joints. PURPOSE: To better understand the joint forces placed on the hip, knee, and ankle with variable speed and decline gradient METHODS: Nine participants (5 male and 4 female; Age = 24.09 ± 2.81 yrs; Weight = 75.12 ± 13.67 kg; …
Pilot Study Of Neuromuscular Fatigue After Doubles Pickleball Tournament, Matthew Ritchey, Margaret Falknor, George Beckham, Eric Martin
Pilot Study Of Neuromuscular Fatigue After Doubles Pickleball Tournament, Matthew Ritchey, Margaret Falknor, George Beckham, Eric Martin
International Journal of Exercise Science: Conference Proceedings
The number of people playing pickleball has grown exponentially for several years in a row, and likewise, the absolute number of injuries due to pickleball have increased. Examining fatigue effects of playing may be a first step to determining injury prevention and game or tournament management strategies. However, in our previous work, we could not detect fatigue after playing multiple recreational games of doubles pickleball. PURPOSE: The purpose of this pilot study was to examine fatigue effects from playing a doubles pickleball tournament. METHODS: Five young men (ages 22-45) tested their force production, as measured by performing a …
Case Study: Can Quadriceps Muscle Growth Be Achieved In Aclr Patient With Neuromuscular Inhibition?, Melody F. Anderson, Lee J Hinkle, Steven P. Allen, Aaron W. Johnson
Case Study: Can Quadriceps Muscle Growth Be Achieved In Aclr Patient With Neuromuscular Inhibition?, Melody F. Anderson, Lee J Hinkle, Steven P. Allen, Aaron W. Johnson
International Journal of Exercise Science: Conference Proceedings
Despite extensive research of ACL reconstruction surgery (ACLR) and rehabilitation, mobility and functional issues often persist, leading to complications beyond the initial injury. This case study presents exercises employed to overcome negative consequences following ACLR. Participant (23yo, F, 163cm, 52kg) underwent ACLR in 2019 after a complete left ACL tear. After 7 months of PT following surgery, the participant was cleared to return to sport and continued consistent activity until 4 years post ACLR. At this time, the participant presented with knee pain, edema exacerbated by activity, 20% loss of range of motion (ROM), and extensive atrophy of the quadriceps …
Differences In Muscle Activation In Individuals With Bilateral And Unilateral Chronic Ankle Instability Ankle Instability, Tanner Lee, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
Differences In Muscle Activation In Individuals With Bilateral And Unilateral Chronic Ankle Instability Ankle Instability, Tanner Lee, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
International Journal of Exercise Science: Conference Proceedings
Individuals with chronic ankle instability (CAI) have altered muscle activation. However, little is known about the differences in muscle activation of the lower extremity in individuals with bilateral and unilateral CAI. PURPOSE: To investigate differences in muscle activations during single-leg stance in individuals with bilateral and unilateral CAI. METHODS: Sixty participants were divided into 3 groups: 20 individuals with bilateral CAI (bilateral), 20 individuals with unilateral CAI (unilateral), and 20 healthy controls (control). Participants performed 3 trials of single-leg stance while muscle activations were recorded for 10 seconds. During the stance, participants stood with hands crossed on their …
Differences In Postural Control In Individuals With Bilateral And Unilateral Chronic Ankle Instability, Ethan Wood, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
Differences In Postural Control In Individuals With Bilateral And Unilateral Chronic Ankle Instability, Ethan Wood, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
International Journal of Exercise Science: Conference Proceedings
Individuals with chronic ankle instability (CAI) have deficits in postural control and muscle activation. However, little is known about the differences in postural control in individuals with bilateral and unilateral CAI. PURPOSE: To compare postural control difference in individuals with bilateral and unilateral CAI. METHODS: Sixty participants were divided into three groups: 20 individuals with bilateral CAI (bilateral), 20 individuals with unilateral CAI (unilateral), and 20 healthy controls (control). Participants performed 3 trials of single-leg stance tasks for 10 seconds simultaneously. During the single-leg stances, participants were instructed to stand as still as possible on a force plate …
Effects Of Ankle Swelling On Dynamic Postural Control In Individuals With Chronic Ankle Instability, Isaiah K. Githuka, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
Effects Of Ankle Swelling On Dynamic Postural Control In Individuals With Chronic Ankle Instability, Isaiah K. Githuka, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
International Journal of Exercise Science: Conference Proceedings
Chronic ankle instability (CAI) individuals have ankle swelling as a residual symptom. Joint swelling following musculoskeletal injuries inhibits full neural activation of muscles, known as arthrogenic muscle inhibition. However, little is known about the effects of ankle swelling on dynamic postural control in CAI individuals. PURPOSE: To investigate the effects of ankle swelling on dynamic postural control in CAI individuals. METHODS: A total of 45 participants were recruited from a university population: 15 CAI individuals with swelling (swelling), 15 CAI individuals without swelling (non-swelling), and 15 healthy controls (control). All participants were measured ankle swelling using a figure …
Effects Of Ankle Swelling On Static Postural Control And Patient-Reported Outcomes In Individuals With Chronic Ankle Instability, Ashton Earl, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
Effects Of Ankle Swelling On Static Postural Control And Patient-Reported Outcomes In Individuals With Chronic Ankle Instability, Ashton Earl, Hyunwook Lee, Seunguk Han, Minsub Oh, Jon Tyson Hopkins
International Journal of Exercise Science: Conference Proceedings
Chronic ankle instability (CAI) individuals have ankle swelling as a residual symptom. Joint swelling frequently occurs and inhibits full neural activation of muscles, known as arthrogenic muscle inhibition. However, little is known about the effects of ankle swelling on static postural control and patient-reported outcomes about ankle function and instability in CAI individuals. PURPOSE: To investigate the effects of ankle swelling on static postural control in individuals with CAI. METHODS: A total of 45 participants were recruited from a university population: 15 CAI individuals with swelling (swelling), 15 CAI individuals without swelling (non-swelling), and 15 healthy controls (control). …
Virtual Reality-Based Assessment On Static Postural Control Among Individuals With Chronic Ankle Instability, Copers, And Controls., Minsub Oh, Hyunwook Lee, Seunguk Han, Jon Tyson Hopkins
Virtual Reality-Based Assessment On Static Postural Control Among Individuals With Chronic Ankle Instability, Copers, And Controls., Minsub Oh, Hyunwook Lee, Seunguk Han, Jon Tyson Hopkins
International Journal of Exercise Science: Conference Proceedings
Individuals with chronic ankle instability (CAI) have deficits in postural control. Previous studies assessing postural control have been limited by minimal environmental perturbation. Little is known about adding dynamic environments using virtual reality (VR) during static postural control in individuals with CAI. PURPOSE: To identify the effects of VR-based assessment on static postural control among individuals with CAI, copers, and healthy controls. METHODS: A total of 60 participants, including 20 individuals with CAI, 20 copers, and 20 healthy controls, performed 3 trials of a single-leg stance for 10 seconds with eyes open (EO), closed (EC), and VR. During the …
Backpack Load And Unload Influence On Positional Parameters In The Static Posture Of College Students, Katya Mata, Hevan Nieto, Bryon C. Applequist, Breanna Morales
Backpack Load And Unload Influence On Positional Parameters In The Static Posture Of College Students, Katya Mata, Hevan Nieto, Bryon C. Applequist, Breanna Morales
International Journal of Exercise Science: Conference Proceedings
The investigation into the load carrying of military applications and children with a disability has been thoroughly evaluated. A population that has been largely ignored, though they are subjected to load carrying daily is the college student. College students often carry books and notebooks from class to class and can be subjected to substantial loads. PURPOSE: The purpose of this study was to investigate the effects of backpack load on positional parameters of static posture in college students. METHODS: Nineteen college-aged students (n = 19, Age = 21.4 ± 1.3 years, Height = 1.7 ± .1 m, Weight = 66.7 …
Seasonal Shifts In Jumping Patterns: A Study Of Countermovement Jump Strategies In High School Football Athletes, Alexa L. Lobato, Samuel T. Lauman, Lindsey C. Hartland, Lucy H. Phan, John P. Abt
Seasonal Shifts In Jumping Patterns: A Study Of Countermovement Jump Strategies In High School Football Athletes, Alexa L. Lobato, Samuel T. Lauman, Lindsey C. Hartland, Lucy H. Phan, John P. Abt
International Journal of Exercise Science: Conference Proceedings
Modern sporting trends have begun to adopt sport science and load monitoring to identify in-season trends with the goal of improving performance and reducing injury. Although these resources have become increasingly common in professional and collegiate sports, many high school athletic programs have yet to adopt such technologies. While previous research has demonstrated season-long changes in jump performance, no research has investigated the impact of in-season demands on the changes in jump strategy in male high school football athletes. PURPOSE: The purpose of this study was to examine changes in jump strategy in high school football players over a …
Countermovement Jump Performance Trends In High School Football Players Throughout A Competitive Season, Samuel T. Lauman, Alexa L. Lobato, Lindsey C. Hartland, Lucy H. Phan, John P. Abt
Countermovement Jump Performance Trends In High School Football Players Throughout A Competitive Season, Samuel T. Lauman, Alexa L. Lobato, Lindsey C. Hartland, Lucy H. Phan, John P. Abt
International Journal of Exercise Science: Conference Proceedings
Football is the largest participation sport amongst male high school athletes in the country with over one million participants. Previous research has demonstrated that countermovement jump (CMJ) performance is negatively affected by in-season fatigue in contact sports such as rugby and hockey. However, little data are available to describe how CMJ performance and force metrics change in high school athletes throughout a competitive football season. PURPOSE: The purpose of this study was to examine the changes in strength and power metrics in high school football players over a single football season. METHODS: Sixty-nine male high school football athletes …
The Effect Of Vision On Isokinetic Muscular Power, Mika Weaver, Casi Helbig, Patrick Cereceres
The Effect Of Vision On Isokinetic Muscular Power, Mika Weaver, Casi Helbig, Patrick Cereceres
International Journal of Exercise Science: Conference Proceedings
Isokinetic muscular power is the ability to generate force at a constant speed. PURPOSE: The purpose of this study was to determine the effect of vision on isokinetic muscular power. METHODS: Participants in this study consisted of twenty-four students from Texas Lutheran University (18 male and 6 female). The mean age was 18.8 with a standard deviation of 1.18. The mean height was 68.67 inches with a standard deviation of 4.26. The mean weight was 177.65 lbs with a standard deviation of 41.06. Subjects met at the Kieffer Kinesiology Laboratory to perform two tests on two different days. …
Human Electrical Brain Dynamics During Locomotor Obstacle Avoidance In Virtual Reality, Carter L. Hartman, Yu-Po Cheng, Andrew Nordin
Human Electrical Brain Dynamics During Locomotor Obstacle Avoidance In Virtual Reality, Carter L. Hartman, Yu-Po Cheng, Andrew Nordin
International Journal of Exercise Science: Conference Proceedings
Visually identifying and avoiding obstacles encountered during walking is crucial for navigating real world environments. Motor deficits that affect gait and balance, and changes due to aging, can increase fall risk. There is a needed to better understand the complex relationships between gaze behaviors of the eye and electrical brain dynamics during locomotor obstacle avoidance. Virtual reality provides nearly limitless opportunities to create experimentally controlled, complex, realistic environments to study human behaviors, such as locomotion. PURPOSE: Our aim was to identify human electrocortical dynamics during walking and obstacle avoidance in virtual reality, to better understand visually guided human locomotor …
Measures Of Center Of Pressure And Lower Leg Muscle Electromyography During Landing Before And After Plantar Flexor Stretch, Connor Hill, Brittany Coltrain, Michael Olson
Measures Of Center Of Pressure And Lower Leg Muscle Electromyography During Landing Before And After Plantar Flexor Stretch, Connor Hill, Brittany Coltrain, Michael Olson
International Journal of Exercise Science: Conference Proceedings
Static stretching of the plantar flexor muscles is reported to modify neuromuscular responses to external stimuli. However, it is not known how these muscles respond to external loading in an applied task, such as single-leg drops. Further, if mechanical laxity in the plantar flexor muscles is present after stretching of it is unclear how this laxity will influence the muscle activation and movement patterns of the lower extremities. PURPOSE: This study is intended to further explore the response of the lower extremities to plantar flexor muscle stretch in an effort to understand its impact on potential injury. METHODS: …
Modified Torque Output And Lower Leg Muscle Electromyography After Passive Stretching, Brittany Coltrain, Connor Hill, Michael W. Olson
Modified Torque Output And Lower Leg Muscle Electromyography After Passive Stretching, Brittany Coltrain, Connor Hill, Michael W. Olson
International Journal of Exercise Science: Conference Proceedings
Increased stretch of the plantar flexor muscles is reported to increase tissue laxity of the tendons and reduces force output, but in other studies the tendon biomechanical properties are not affected and force output is not changed after stretch. PURPOSE: To examine the force output and muscle electromyography activity of lower leg muscles to a prolonged passive stretch. METHODS: Five participants (20.6 ± 1.1 yrs: 1.78 ± 0.1 m:, 80.6 ± 9.9 kg) performed maximal plantar and dorsi flexion isometrically while secured to an isokinetic dynamometer. They were seated upright with ~90 deg hip flexion. The knee was …
Biomechanical Assessment Of Footwear And Foot Landing Types In Collegiate Female Runners At Preferred Running Speed, Shivaniba Gohil, Michael W. Olson
Biomechanical Assessment Of Footwear And Foot Landing Types In Collegiate Female Runners At Preferred Running Speed, Shivaniba Gohil, Michael W. Olson
International Journal of Exercise Science: Conference Proceedings
Barefoot and shod running with conditions at heel landing and forefoot landing has implications on running biomechanics. PURPOSE: To investigate the impact of two footwear and two foot landing type conditions on lower limb and lumbar acceleration and kinematics. METHODS: Six collegiate female runners (20.6 ± 1.5 yrs, 58.6 ± 4.7 kg, 1.63 ± 0.05 m) performed running trials on a motorized treadmill. Their averaging running volume was 49.6 ± 31.5 km/wk (range: 16.1 – 80.5 km/wk). Inertial measuring units (IMUs) (370 Hz), containing triaxial accelerometers (1g = 9.81 m/s/s) and gyroscopes (deg/s), were secured on the foot/shoe …
Comparison Of Overground, Motorized Treadmill And Non-Motorized Treadmill Gait, Kevan D. Kennedy, Scott P. Mclean, Emma Williams
Comparison Of Overground, Motorized Treadmill And Non-Motorized Treadmill Gait, Kevan D. Kennedy, Scott P. Mclean, Emma Williams
International Journal of Exercise Science: Conference Proceedings
Shaulis et al., (2022) found that walking on a non-motorized treadmill (NMT) elicited greater EMG activity from plantar flexor (PF) muscles compared to walking overground (OG) and on a motorized treadmill (MT). PURPOSE: To compare kinematics, kinetics and EMG in OG, MT, and NMT walking. METHODS: Twenty-one healthy adults (24.4±7.2 yrs, 1.75±0.09 m, 75.4±13.1 kg) completed one trial of walking at 3.0 mph in each of three modes (OG, MT, NMT). All dependent measures were averaged across a minimum of two consecutive gait cycles. Surface EMG of the Gastrocnemius (GA), and Tibialis Anterior (TA) was collected at 1000 …