Education Commons^™

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

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

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

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

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

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

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

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

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 …

The Influence Of Initial Foot Position During Stand To Sit On Trunk And Knee Joint Movement Control, William V. Erlandson, Linda Steele

International Journal of Exercise Science: Conference Proceedings

During StandTS, trunk flexion and knee extensor eccentric control are two key factors influencing descending balance control of StandTS movement- trunk flexion plays an important role in controlling the vertical downward acceleration of the center of mass, while knee extensor eccentric control is essential for arresting the falling momentum to ensure a stable and safe landing. Since the initial foot position (IFP) is an important factor that can improve sit-to-stand (STS) performance by modifying STS kinematics and kinetics during the uprising phase, we explored the effects of IFPs on StandTS. PURPOSE: The purpose of this study was to examine the …

The Relationship Between Shoulder Mobility And Upper Body Muscle Mass On 2-Rm Bench Press Performance, Raquel J. Cavazos, Francesca Aquilino, Ernesto Balderrama, Chaehyun Byun, Shelby Gerner, Cheyenne Martinez, Austin Riffe, Vipa Bernhardt, Michael D. Oldham

International Journal of Exercise Science: Conference Proceedings

INTRODUCTION: Upper body strength is one of the most important factors in American football and thus tested frequently. However, strength may come at the cost of mobility as recent studies have reported an inverse relationship between shoulder range of motion (ROM) and strength, with an increase in strength causing a decrease in ROM (Shitara et al., 2022). PURPOSE: The purpose of this study was to determine if upper body muscle mass or shoulder mobility are associated with two-repetition max (2-RM) bench press performance in collegiate football players. METHODS: Data from 80 Division I varsity football players (20.5 ± 1.4 …

Intermuscular Emg Coherence Between Shoulder Muscles During Fatigue In Older Adults With And Without Rotator Cuff Disease, Xinyu Li, Huiying Zhu, Lisa Griffin

International Journal of Exercise Science: Conference Proceedings

The risk of degenerative rotator cuff disease (RCD) increases with age, partly due to changes in neuromuscular control, especially during fatiguing contractions. Intermuscular electromyographic (EMG) coherence, reflecting shared neural inputs between motor neuron pools, is essential for maintaining shoulder joint stability. PURPOSE: To determine differences in EMG coherence within the rotator cuff muscles, and between the rotator cuff and deltoid muscles, during sustained isometric fatiguing contractions in older adults with and without RCD. METHODS: Thirteen older adults with RCD (68 ± 8 yrs) and 20 without RCD (69 ± 8yrs) participated. Intramuscular EMG was recorded from the supraspinatus …

The Effects Of Liftng Belts On Power Output, Julio Aguilar, Benjamin Coldwell, Patrick Jackson, Cade Pippen, Zane Thornton

International Journal of Exercise Science: Conference Proceedings

JULIO AGUILAR, BENJAMIN COLDWELL, PATRICK JACKSON, CADE PIPPEN, ZANE THORTON.

Kinesiology & Health Science; Stephen F. Austin State University; Nacogdoches, TX

Category: Undergraduate

Advisor: Chelette, Amber, amber.chelette@sfasu.edu

Lifting belts, when lifting heavy weights, are purportedly used to support, stabilize, and attenuate the load on the spine. With the additional support, potential questions arise about whether weightlifting belts affect the power performed when squatting. This study aimed to examine the power produced during a squat with a weightlifting belt compared to a squat performed without one. Ten subjects, five male and five female, performed squats of two sets of 3 repetitions, …