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Exercise Science Commons™

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2016

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Articles 61 - 90 of 159

Full-Text Articles in Exercise Science

A Single Night Of Sleep Restriction Impairs Recovery From Heavy Exercise, John D. Chase May 2016

A Single Night Of Sleep Restriction Impairs Recovery From Heavy Exercise, John D. Chase

Masters Theses, 2010-2019

We examined the effects of one night of sleep restriction (Sleep-; 2.5 hrs) on subsequent 3-km cycling performance and skeletal muscle recovery from heavy exercise compared to a full night of rest (Sleep+; 7 hrs). Seven recreational cyclists (n=6 male, n=1 female; age = 24.4 ± 7 yrs; height = 170 ± 10 cm; weight = 68 ± 13 kg VO2max = 61.5 ± 4.4 ml/kg/min) completed four simulated 3-km time trials (TT) and six peak isokinetic torque trials at different speeds (30 and 120°/sec) under both conditions. The first exercise trial (EX1) consisted …


Reliability Of Gastrocnemius Pennation Angle Using Ultrasound With 15 Degree Adduction And Abduction In Standing Position, Diana J. Tyler May 2016

Reliability Of Gastrocnemius Pennation Angle Using Ultrasound With 15 Degree Adduction And Abduction In Standing Position, Diana J. Tyler

Honors College Theses

A pennate muscle has fascicles that attach obliquely to its tendon. In parallel, more fascicles can be aligned allowing for greater production of force. In previous research, pennation angle has been measured using ultrasound while in a laying supine position. The purpose of this study was to measure pennation angle of the gastrocnemius muscle with ultrasound while standing neutral, in a mechanically loaded position. 16 participants, one two separate days, had their ultrasound imaging taken in three different foot orientations: neutral, fifteen degree adduction / abduction positions. This information was then be analyzed using ImageJ software. This research shows the …


The Effect Of Weighted Body Armor On Close Combat Reaction Time And Core Muscle Activation 2016, Christopher Banta May 2016

The Effect Of Weighted Body Armor On Close Combat Reaction Time And Core Muscle Activation 2016, Christopher Banta

Master's Theses

The purpose of this study was to measure the choice reaction time and myoelectric activity of the right and left rectus abdominus, and right and left external obliques required to initiate movement in response to a visual stimulus that signaled performance of four different closecombat movements (left or right cross and left or right dodge). Reaction time and myoelectric activity were then compared with performing the movements in response to the visual stimulus while wearing a weighted vest that simulated wearing tactical body armor. Myoelectric activity was measured as the average root mean square (RMS) of the surface electromyography (sEMG) …


Power Output And Loads On The Lumbar Vertebrae During A Power Clean 2016, Joseph Keleher May 2016

Power Output And Loads On The Lumbar Vertebrae During A Power Clean 2016, Joseph Keleher

Master's Theses

The purpose of the present study was to compare the peak resultant torque, shear, and compressive forces acting at the L3/L4 junction of the lumbar vertebrae and the peak power output during 40% one repetition maximum (1RM) and 80% 1RM attempts of the power clean. It was hypothesized that performance of a power clean at 80% 1RM will result in greater peak resultant compressive force, torque and shear force at the L3/L4 junction of the lumbar spine than that of a 40% 1RM attempt. Power cleans at 80% 1RM will also result in higher maximum instantaneous power outputs than that …


Do Running Kinematics Change On The Alter-G Treadmill? [2016], Brittany Lavaute May 2016

Do Running Kinematics Change On The Alter-G Treadmill? [2016], Brittany Lavaute

Master's Theses

The Alter-G lower body positive pressure treadmill, also known as the antigravity treadmill, provides a unique means of exercising for rehabilitation patients and low-impact training in athletes. The purpose of this study was to examine the interaction effect of four different treadmill weighted conditions and three different running velocities (2.68 m.s-1, 3.13 m.s-1, and 3.58 m.s-1) on the kinematic variables of step length, step rate, contact time, and flight time on the Alter-G treadmill (AG) and on the regular treadmill (TM). Fifteen participants completed two separate days of testing. All individuals ran at four different conditions (100%, 80%, 60%, and …


Determining The Optimal Combination Of Lifting Method And Intensity For Power Production During The Hang Clean 2016, Thomas P. Murray May 2016

Determining The Optimal Combination Of Lifting Method And Intensity For Power Production During The Hang Clean 2016, Thomas P. Murray

Master's Theses

The purpose of this study was to determine the optimal combination of lifting method and load intensity for power production during the hang clean. Twenty college students (18 male, 2 female) performed one set of three repetitions of the hang clean at four different intensities for each method while standing on a force platform embedded in the floor. Intensities were set at 50%, 60%, 70%, and 80% 1RM and the methods tested were Contact, where the participant maintained contact with the force platform throughout the lift, and Jump, where the participant jumped through the pull phase of the lift and …


The Effects Of Whole Body High-Intensity Interval Training On Collegiate Female Soccer Players 2016, Whitney Frary May 2016

The Effects Of Whole Body High-Intensity Interval Training On Collegiate Female Soccer Players 2016, Whitney Frary

Master's Theses

Soccer is considered a high intensity sport that requires a high level of both aerobic and anaerobic fitness. A whole body high-intensity interval training adaptation has been shown to benefit both of these systems over a short period of time. The purpose of this study was to examine the effects of a five week whole-body high intensity interval training program on female collegiate soccer players performance in speed, acceleration, agility, vertical jump, aerobic capacity, physical self perception, and physical enjoyment. Participants were from the SUNY Cortland women’s soccer team who participated in a five- week training protocol three days a …


Effects Of Intermittent Pneumatic Compression On Leg Blood Flow And Vascular Function After Spinal Cord Injury, Lena Marie Cialdella May 2016

Effects Of Intermittent Pneumatic Compression On Leg Blood Flow And Vascular Function After Spinal Cord Injury, Lena Marie Cialdella

Master's Theses

Intermittent pneumatic compression (IPC) can increase leg blood flow (BF) in able-bodied persons. Whether IPC can alter leg BF, and improve vascular function in people with SCI is currently unknown. PURPOSE: Test the hypothesis that acute IPC will increase leg BF, and improve vascular function in SCI. METHODS: Participants (n=8; injury level: T3 and below; A.S.I.A. class A-C; age: 41±17 yrs) were recruited for a 1-hour IPC session performed in one leg (experimental leg; EXP), with the other serving as a control (CON). IPC consisted of sequential, foot-to-calf compressions (4-s inflate, 16-s deflate; 3 compressions/min). Posterior-tibial artery BF (Doppler-ultrasound) was …


The Effect Of Descriptive Norms On Resistance Exercise Self-Efficacy In College-Aged Females 2016, Justin Kompf May 2016

The Effect Of Descriptive Norms On Resistance Exercise Self-Efficacy In College-Aged Females 2016, Justin Kompf

Master's Theses

Resistance training is a form of physical activity that provides substantial health benefits. Despite these widespread benefits, participation in resistance training is considerably low, particularly among females. To engage in a skill-related activity such as resistance training, individuals need to have confidence in their abilities. Self-efficacy is a cognitive construct that is used to describe situation-specific self-confidence. Descriptive norms are a type of social norm that describes the behavior of others. Descriptive norms have been useful in positively changing health related behaviors. The exact mechanism of how descriptive norms alter behavior is unknown. However, it has been show in research …


Implementation Of Exercise Is Medicine On Campus At Uri, Gabrielle E. Tyer May 2016

Implementation Of Exercise Is Medicine On Campus At Uri, Gabrielle E. Tyer

Senior Honors Projects

According to the Centers for Disease Control and Prevention National Center for Health Statistics, the leading causes of mortality and morbidity in the United States are chronic diseases, including heart disease, lung disease, cancer, cerebrovascular disease and diabetes. There has been recent attention paid to the role that higher levels of physical activity and lower levels of physical inactivity can play in the prevention and management of chronic disease. As a result of the strength of this evidence, the American College of Sports Medicine, in partnership with the American Medical Association, created the Exercise is Medicine (EIM) initiative. The goal …


Effects Of Diet-Induced Obesity On Extracellular Matrix Remodeling During Skeletal Muscle Regeneration, Michelle A. Tedrowe May 2016

Effects Of Diet-Induced Obesity On Extracellular Matrix Remodeling During Skeletal Muscle Regeneration, Michelle A. Tedrowe

Health, Human Performance and Recreation Undergraduate Honors Theses

Skeletal muscle has the ability to regenerate from damage; however, recent studies have reported a negative effect of obesity on skeletal muscle regenerative capacity. The extracellular matrix (ECM) contributes to skeletal muscle structure acting as a scaffold for skeletal muscle. Additionally, skeletal muscle serves as a reservoir for proteins and growth factors that promote regeneration. Optimal skeletal muscle regeneration includes inflammation, ECM remodeling, and myofiber growth. Disruption to any of these processes can negatively affect skeletal muscle regeneration. PURPOSE: The purpose of this study was to determine how diet-induced obesity (DIO) affects ECM remodeling during skeletal muscle regeneration. METHODS: Fifty-six …


Neural Activation In Blood-Flow-Restricted Versus Non-Blood-Flow-Restricted Exercise: An Fmri Study, Tiffany Dawn Devries May 2016

Neural Activation In Blood-Flow-Restricted Versus Non-Blood-Flow-Restricted Exercise: An Fmri Study, Tiffany Dawn Devries

Theses and Dissertations

Functional magnetic resonance imaging (fMRI) can be used to track neural activation in the brain during functional activities. The purpose of this study was to investigate brain neural responses to blood flow restricted (BFR) versus control handgrip exercise. Using a randomized crossover design, 25 subjects (12 males, 13 females) completed handgrip exercises during two conditions: BFR vs. control. To familiarize participants with the exercise conditions, one week prior to MRI scanning participants completed each exercise condition once on separate days, with 72 hours between days. The following week fMRI scans were performed at the same time of day, separated by …


Exercise Is Medicine, Colby A. Sousa May 2016

Exercise Is Medicine, Colby A. Sousa

Senior Honors Projects

College student are often faced with new challenges upon arrival to campus, including making independent decisions about their health and wellness.

As students face new academic and social responsibilities, issues with time management and stress often compromise many students abilities to adopt and maintain health promoting behaviors, including eating well and participating in regular physical activity. The adoption of less health promoting behaviors is associated with increases in rates of illness, increases in weight, adoption of poor sleeping patterns and increasingly poor stress management.

As such, knowledge of the importance of proper nutrition and physical activity/ exercise for optimal health …


Comparison Of Take Off Kinematics During Loaded Countermovement Jumps In Division One Female Gymnasts And Soccer Athletes, Ryan Moreau May 2016

Comparison Of Take Off Kinematics During Loaded Countermovement Jumps In Division One Female Gymnasts And Soccer Athletes, Ryan Moreau

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Purpose: The purpose of this study was to compare takeoff kinematics of incrementally loaded countermovement jumps (CMJ) in water and land in female gymnasts and soccer athletes.

Methods: 24 Division I student athletes (12 gymnastics, 12 soccer) volunteered for this study. Subjects performed CMJ on land and water at a level of the xiphoid process without an arm swing. CMJs with loads of body weight (BW), 10% BW, 20% BW, and 30% BW were performed three times per trial at each load. 15 kinematic variables related to the lower extremity were examined.

Results: For environment, significant (p less than …


Determining The Appropriate Timing Of Administration For Baseline Computerized Neurocognitive Testing (Cnt) Following Maximal Exertion, Samantha Mohler May 2016

Determining The Appropriate Timing Of Administration For Baseline Computerized Neurocognitive Testing (Cnt) Following Maximal Exertion, Samantha Mohler

Health, Human Performance and Recreation Undergraduate Honors Theses

Background: Computerized neurocognitive testing is part of the recommended multi-faceted approach to SRC assessment. Prior research has suggested that maximal exertion negatively effects CNT test scores. Purpose: To identify the appropriate timing of the administration of CNT following maximal exertion in healthy college-aged student athletes. Study Design: Prospective, random cross-over, repeated measures design. Methods: Week one participants fill out intake forms and then complete a baseline ImPACT test. The following three weeks, individuals were administered a VO2 max cycle ergometer test. Following the test participants will rest for <5 (immediate), 15, or 30 minutes before re-taking ImPACT. Results: Immediately following maximal exertion, negative composite scores, relative to baseline, were …


Independent Effect Of Heat Stress During Exercise On Arterial Stiffness, Cash Arcement May 2016

Independent Effect Of Heat Stress During Exercise On Arterial Stiffness, Cash Arcement

Health, Human Performance and Recreation Undergraduate Honors Theses

Context: Cardiovascular disease (CVD) is one of the leading causes of mortality in the United States, accounting for about 1 in every 3 deaths annually. While studies have shown that arterial stiffness, a leading precursor to CVD, improves with passive heat stress not much is known about the independent effect of heat stress during exercise on arterial stiffness. Objective: The objective of this study was to examine the independent effect of heat stress during exercise on arterial stiffness. Design: Participants visited the lab three times; one familiarization and two experimental trials. Experimental trials were randomized and counter-balanced. Setting: All trials …


Examining Different Exercise Types On Falls Efficacy In Older Adults, Hadley Lewis May 2016

Examining Different Exercise Types On Falls Efficacy In Older Adults, Hadley Lewis

Health, Human Performance and Recreation Undergraduate Honors Theses

Context: Around 30% of older adults over the age of 65 fall once a year. These falls can result in hospitalization and permanent injury. Falls efficacy, or the confidence level that one will not fall, has been shown to have a direct correlation to the fear of falling and falls. It has been found that 29-92% of older adults who have fallen have a fear of falling and 12-65% of older adults who have not fallen experience a fear of falling. This fear of falling acts as a hindrance on older adult’s ability to complete daily activities and leads …


Autophagy Regulation After Diet And Exercise In Non-Alcoholic Fatty Liver Disease, Megan Elizabeth Rosa May 2016

Autophagy Regulation After Diet And Exercise In Non-Alcoholic Fatty Liver Disease, Megan Elizabeth Rosa

Graduate Theses and Dissertations

Along with the rise in obesity, rates of non-alcoholic fatty liver disease (NAFLD) have also increased. NAFLD may begin with fat accumulation in the liver, but can progress to non-alcoholic steatohepatitis (NASH), fibrosis, and eventual cirrhosis. With no pharmacological treatment for NASH, lifestyle interventions appear vital to maintaining liver health. Previous work has shown aberrant mitochondrial content/quality and autophagy in models of NAFLD. Exercise is known to improve mitochondrial health and possibly autophagy, thus autophagy may be a key regulatory factor for treatment of obesity induced-NAFLD. PURPOSE: The purpose of the study was to examine how weight loss from diet …


Sensitivity Of The Vasoactive Range In Determining Aerobic Fitness, Preston L. Bell May 2016

Sensitivity Of The Vasoactive Range In Determining Aerobic Fitness, Preston L. Bell

Honors Theses

Previous work has demonstrated a direct relationship between aerobic fitness and indices of vasodilatory function (i.e., Flow-mediated Dilation; FMD). Importantly, recent evidence suggests that vasoconstrictor function to reductions in blood flow (i.e., Low-Flow Mediated Constriction; L-FMC), as well as during sympatho-excitation (i.e., Cold Pressor Test), may compliment the FMD measure, thus, providing an overall range of vascular responsiveness. The purpose of this thesis project was to test the hypothesis that vasoactive range indices (peak vasodilation + nadir vasoconstriction) are sensitive to aerobic fitness levels in healthy young men. Fourteen males (age: 22±4 yrs) were recruited, and divided evenly into a …


The Effect Of Fluid Balance On Exercise Performance In The Heat, Yasuki Sekiguchi May 2016

The Effect Of Fluid Balance On Exercise Performance In The Heat, Yasuki Sekiguchi

Graduate Theses and Dissertations

Introduction: In dehydrated individuals thirst seems to disappear after ingestion of small amount of water before full rehydration. This phenomenon has been linked to oropharyngeal receptors. However, some researchers suggest that drinking to satisfy thirst is enough for optimal performance. It is well established that water deficit greater than 2% of body weight decreases exercise performance in the heat. No study has ever examined the effect hydration on exercise performance in the absence of thirst via oropharyngeal stimulation. Purpose: The purpose of this study is to examine the effect of dehydration on exercise performance and thermoregulation during exercise in the …


The Acute Effects Of Aerobic Exercise With Blood Flow Restriction Cuffs On Arterial Compliance In Males And Females, Maria M. Gonzalez May 2016

The Acute Effects Of Aerobic Exercise With Blood Flow Restriction Cuffs On Arterial Compliance In Males And Females, Maria M. Gonzalez

Theses and Dissertations

RESULTS: Significant condition*gender interactions found in in SBP (p<.05), PR (p<.01), SVR (p<.01), SpO2 (p<.05), PWV carotid to femoral (p<.03), and PWV femoral to distal (p<.02). Significant condition*time interactions were found in SBP (p<.01), DBP (p<.01), MAP (p<.01), SV (p<.01), CO (p<.01), SVR (p<.01), TVI (p<.01), HR (p<.01), and SAE (p<.01). Significant condition main effects were found in SBP (p<.02), DBP (p<.03), PR (p<.03), SV (p<.01), CO (p=.01), SVR (p<.01), TVI (p<.01), HR (p<.01), and SAE (p<.03) as well as a condition trend in PWV femoral to distal (p=.06). Significant time main effects were found in SBP (p<.01), MAP (p<.04), PP (p<.01), PR (p<.01), CO (p<.01), SVR (p<.01), TVI (p<.01), HR (p<.01), SpO2 (p<.01), LAE (p<.03), and PWV femoral to distal (p<.01).

CONCLUSION: The 60 min session at a moderate aerobic intensity might have the potential to improve arterial elasticity more than a 20 min BFR session.


A Prediction Model For Acute Core And Lower Extremity Injuries In Division 1 Collegiate Football Players, Alexandra Aline Mcdonald May 2016

A Prediction Model For Acute Core And Lower Extremity Injuries In Division 1 Collegiate Football Players, Alexandra Aline Mcdonald

Graduate Theses and Dissertations

Context: Various intrinsic factors such as high exposure, poor endurance of core muscles, previous injury, strength deficits, suboptimal neurocognitive function, and orthopedic abnormalities have been found as predictors for sprains and strains among collegiate football players. Objective: Assess the applicability of pre-participation assessments as predictors of core or lower extremity injury. Design: Cohort Study. Setting: National Collegiate Athletic Association Division I football program. Patients or Other Participants: Athletes who underwent mandatory pre-participation examinations before preseason football training over two consecutive seasons (n=225). Main Outcome Measure(s): Associations between preseason protocols and injury incidence for core and lower extremity injuries were established …


Effects Of A Virtual Training Partner On Cycling Time Trial Performance In Recreationally Active Females, Janae L. Myers Apr 2016

Effects Of A Virtual Training Partner On Cycling Time Trial Performance In Recreationally Active Females, Janae L. Myers

Celebrating Scholarship & Creativity Day (2011-2017)

Introduction. Fatigue is a result of physiological and psychological limits. Associative thoughts (thoughts of physical sensations) and dissociative thoughts (thoughts not regarding physical sensations) compete for attentional focus during exercise and can influence exercise performance and fatigue. Distractions during exercise, such as watching TV or interactive exercise, increase dissociative thoughts and reduce rate of perceived exertion (RPE). Limited research exists regarding the effects of a virtual training partner on exercise performance and fatigue.

Purpose. To examine whether the use of a virtual training partner (ghost) will improve performance by increasing dissociative thoughts. We hypothesized that the use of a ghost …


Concussions, Why They Go Unreported, Drake Matuska Apr 2016

Concussions, Why They Go Unreported, Drake Matuska

Celebrating Scholarship & Creativity Day (2011-2017)

Introduction: In the world today, concussions are a major health risk in sports and many other physically demanding activities. Every day, we see former athletes who have experienced multiple concussions complain of cognitive impairment and memory loss. It is the risk every athlete takes when they participate in a sport they love; however, when an individual plays through a concussion that is when a line is crossed. People playing through a concussion lead to the foundation of this study, which is to find out why individuals play through their concussions, why they fail to report, and the core cognitive reasons. …


Hydration Status, Habits, And Knowledge Of Collegiate Cross Country Runners, Laura J. Comee Apr 2016

Hydration Status, Habits, And Knowledge Of Collegiate Cross Country Runners, Laura J. Comee

Celebrating Scholarship & Creativity Day (2011-2017)

Abstract: Dehydration exceeding 2% loss of body mass can cause decreased cognitive and physical performance in endurance athletes. While many runners carry water bottles with them, most do not know their sweat rate or fluid recommendations, increasing the risk for heat-related illnesses such as heat stroke. Purpose: To assess hydration status, habits, and knowledge of collegiate cross country runners. Methods: Institutional Review Board approval was obtained and subjects completed informed consents. Thirty-three female and twenty-five male Division III collegiate runners participated in the study. Hydration status was assessed measuring the specific gravity of three urine samples one each …


Electromyographic And Mechanomyographic Time And Frequency Responses During Fatiguing, Submaximal, Isokinetic Muscle Actions Of The Biceps Brachii, Ethan C. Hill Apr 2016

Electromyographic And Mechanomyographic Time And Frequency Responses During Fatiguing, Submaximal, Isokinetic Muscle Actions Of The Biceps Brachii, Ethan C. Hill

College of Education and Human Sciences: Dissertations, Theses, and Student Research

The purpose of the present investigation was to examine the time-course of changes in electromyographic (EMG) and mechanomyographic (MMG), time and frequency domain responses during repeated, submaximal, concentric, isokinetic, forearm flexion muscle actions. Twelve men (mean age ± SD = 22.6 ± 2.2 yrs; body weight = 84.0 ± 8.3 kg; height = 178.6 ± 8.3 cm) performed 50 repeated, submaximal (65% of concentric peak torque), concentric muscle actions of the dominant forearm flexors on an isokinetic dynamometer at 60°·s-1. Surface EMG and MMG signals were simultaneously recorded from the biceps brachii muscle. Polynomial regression analyses (first, second, …


Nutrition And Exercise: Best Of Both Worlds, Jacob Allen Burns, Lukas Swysgood, Trenton Antonaros Apr 2016

Nutrition And Exercise: Best Of Both Worlds, Jacob Allen Burns, Lukas Swysgood, Trenton Antonaros

Senior Year Experience Student Projects

To teach the students of the Best of Both Worlds (BOBW) program how to live a healthy lifestyle by introducing simple nutrition and exercise methods that can be done at home. To offer a program that is understandable at all levels of education that introduces effective and easy ways to eat healthier and exercise simply. A PowerPoint that explains nutrition and exercise information. Hands on learning and visuals to help students capture positive health ideas. Interactive demonstration of exercises and introduction of banded exercises. A before and after survey to quiz students on knowledge prior to and after seminar. An …


Assessment Of Anti-Saccades Within 24 To 48 Hours Post-Concussion, Nathan D'Amico Apr 2016

Assessment Of Anti-Saccades Within 24 To 48 Hours Post-Concussion, Nathan D'Amico

GS4 Student Scholars Symposium

INTRODUCTION: Approximately 90% of concussions involve oculomotor impairment, with saccadic eye movement deficits being the most prominent oculomotor impairment. Saccades are rapid eye movements that bring a fixed point or area of interest into the center of sight and are important for safely navigating through the environment. Anti-saccades are saccadic eye movement deficits that involve a reflexive, involuntary saccade away from a fixed point or area of interest. Assessments of anti-saccades may provide a fast, accurate, and reliable way to screen for concussion. However, little research quantitatively explores anti-saccades post-concussion.

PURPOSE: To investigate anti-saccades between NCAA Division I athletes 24-48 …


Identification Of Kinematic And Kinetic Injury Risk Predictors In Division I Football Athletes, Corbin M. Rasmussen, Guilherme M. Cesar, Shinya Takahashi Apr 2016

Identification Of Kinematic And Kinetic Injury Risk Predictors In Division I Football Athletes, Corbin M. Rasmussen, Guilherme M. Cesar, Shinya Takahashi

UCARE: Research Products

biomechanical patterns and insufficiencies that may influence risk of ligamentous injury, such as an anterior cruciate ligament (ACL) tear. One kinematic pattern that has been identified as detrimental to ACL integrity is frontal plane knee collapse (valgus) during jumping and landing tasks.1 Inter-limb differences in force generation have also been connected to the occurrence of lower extremity injury.2 It is not known, however, whether these patterns contribute to the occurrence of lower extremity (LE) non-contact soft-tissue injury. The counter-movement vertical jump (CMVJ) is one way to simultaneously screen for knee collapse and asymmetrical force production patterns. This method was therefore …


Time Course Of Changes In Neuromuscular Parameters During Fatiguing High-Load And Low-Load Concentric Dynamic Constant External Resistance Leg Extension Muscle Actions, Cory M. Smith Apr 2016

Time Course Of Changes In Neuromuscular Parameters During Fatiguing High-Load And Low-Load Concentric Dynamic Constant External Resistance Leg Extension Muscle Actions, Cory M. Smith

Department of Nutrition and Health Sciences: Dissertations, Theses, and Student Research

The purpose of this study was to simultaneously assess electromyographic (EMG) and mechanomyographic (MMG) signals to examine the time course of changes in EMG amplitude, EMG frequency, MMG amplitude, and MMG frequency from the vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) muscles during high-load (70%1 repetitions maximum; 1-RM) and low-load (30% 1-RM) concentric, dynamic constant external resistance (DCER) leg extension muscle actions to failure. Twelve men performed two randomized visits consisting of either 30 or 70% 1-RM DCER leg extension muscle actions to failure. Maximal voluntary isometric contractions (MVIC) and 1-RM measurements were performed before and after …