The Interaction Of Treadmill Type And Incline Slope On Biomechanics And Muscle Activation During Human Locomotion, Rohit Kundu

Cal Poly Humboldt theses and projects

Treadmills are widely used in biomechanical research. However, variations in treadmill design and running surfaces may affect biomechanical variables such as muscle activation and impact acceleration. In addition, incline walking on treadmills leads to changes in the pattern of muscle activation, particularly at steeper inclines. Despite extensive research on the effects of running surfaces and inclines on biomechanical variables (gait, muscle activation, impact force), the impact of varying treadmill manufacturers on biomechanical variables at high inclines remains unclear. Purpose: To determine whether the type of treadmill deck influences surface electromyography (EMG) patterns and impact accelerations at high incline (20%) walking …

A Preliminary Study For The Development Of Free Weight Back Squat Muscular Fitness Reference Norms For Adults Aged 19-29, Eden G. Marquez

Cal Poly Humboldt theses and projects

The barbell back squat is a simple and common resistance training exercise that is used to evaluate muscular fitness. Its use as an evaluative method for muscular fitness in the general population is limited due to a lack of published reference values for this free weight exercise in the general population. This study presents reference values for the back squat muscular fitness in healthy active young adults (aged 19-29). This data is made of 399 subjects (51% male/49% female). Mean ±SD for participants in anthropometric data were 23.1±2.8 years of age, 73.0±12.9 kg weight, 170.6±9.4 cm height, and 25.0±3.4 body …

Wingate Muscular Power Test Reference Values For Active Healthy Adults Ages 19-29: Normative Data And Differences Between Sex, Levi Basist

Cal Poly Humboldt theses and projects

The Wingate Muscular Power Test (WMPT) has existed for several decades and to this day is considered the gold standard for evaluating an individual’s muscular power. However, the utility of this test is predicated on having accurate and relevant normative data with which to compare individual results. At present, the existing literature on this subject is either several decades old and/or inclusive of only specific subject groups (i.e. men only or sport-specific athletes). This study presents WMPT normative values for active healthy adults ages 19-29, separated by sex. The sample consisted of 330 active healthy volunteers (186 men and 144 …

Effects Of A Dual-Task Paradigm On Tandem Gait Performance, Courtney Angela Perry

Cal Poly Humboldt theses and projects

In concussion management, a variety of cognitive and motor control tests, like the tandem gait, have been used for assessing the presence of a concussion injury at the sideline and through recovery. More recently, research suggests that introducing a secondary cognitive retention task during tandem gait (i.e., dual task) may provide a better assessment of concussion. The purpose of this study was to determine if a tandem gait test paired with a 6-digit retention is a valid and reliable tool. Participants completed three trials of both the single-task (ST) and dual-task (DT) tandem gait tests, and their average (MEAN) and …

Comparing Knee Joint Mechanics Across Phases Of The Menstrual Cycle, Bethany Kilpatrick

Cal Poly Humboldt theses and projects

Anterior cruciate ligament (ACL) injuries are among the most commonly occurring knee injury. Compared to men in the same sports, females are two to eight times at higher risk for ACL injury. Research suggests that hormone fluctuations across the menstrual cycle (MC) play a crucial role in ACL injuries due to their effect on tendons and ligament's mechanical properties. PURPOSE: To examine knee joint laxity during dynamic movements across three-time points of the MC. METHODS: Seven young, healthy females with regular MCs performed three jump-landing tasks (double leg depth jump, single-leg lateral jump, and single-leg forward jump) across the early-follicular, …

Anaerobic Capacity Measures In Healthy Active Adults Ages 18-29: Normative Reference Values And Differences Between Sex, Dylan E. Roberts

Cal Poly Humboldt theses and projects

The purpose of this study was to develop normative reference values for the modified Anaerobic Speed Test (mAST), an anaerobic capacity test that can be administered and completed on a commercial treadmill. The mAST of 15% grade has been created as one of the only protocols based on the original AST protocol of 20% grade. However, no percentile norms currently exist for this protocol, limiting its usefulness and interpretation of results. This paper presents normative values for active healthy adults ages 18-29, separated by sex. The sample consisted of 276 active healthy volunteers (161 men and 115 women). All mASTs …

The Effect Of Interval Intensity On Time To Exhaustion During High Intensity Interval Training (Hiit) Running In Recreational Male Runners, Andrew M. Hahn

Cal Poly Humboldt theses and projects

High Intensity Interval Training (HIIT) has become extremely popular in recent years, however, current HIIT prescriptions lack guidelines regarding interval intensities and associated margins. The purpose of this study is to investigate Run Time to Exhaustion (Te) and provide insight regarding HIIT intensities for future aerobic exercise programming. Ten healthy adult male recreational runners (Age=22.9 ± 2.5 yr., Ht=1.72 ± 0.1m, BM=74.1 ± 7.4 kg) measured maximal oxygen consumption (VO2max) (52.4 ± 6.1ml/kg/min) with a graded exercise test (GXT). Running speed was determined using ACSM running equation for exercise metabolism. Protocols 1-3 were HIIT running sessions, and Protocol 4 was …

Application Of The Predicted Repetitions-To-Failure Perceived Exertion Scale For The Nfl-225lb Bench Press Test, Anthony G. Ratto

Cal Poly Humboldt theses and projects

PURPOSE: To assess how accurately Division II NCAA football players can predict repetitions-to-failure (RTF) during the bench press exercise using an absolute load of 225-lbs by comparing predicted repetitions-to-failure with actual repetitions-to-failure. METHODS: Twenty football players (age 20 ± 2 years; height 1.85 ± .06 m; weight 110.1 ± 19.3 kg) without muscular or skeletal injuries were tested for their 1repetition maximum (1-RM) in the bench press, and then performed 1 set to concentric failure with 225-lbs. Subjects predicted how many repetitions they could perform after the warm-up and again after the fourth, eighth, twelfth repetitions. A general regression analysis …

Physical Therapist Views And Experiences With Patient Use Of Marijuana, Arturo De La O Basurto Jr.

Cal Poly Humboldt theses and projects

Conditions seen within physical therapy settings overlap with reasons that patients seek marijuana. For this reason, information about these professionals’ outlooks on patients’ marijuana use in prime. Purpose: Gain current views and experiences of physical therapists (PTs)/physical therapist assistants (PTAs) on their patients’ use of marijuana in the physical therapy field. Methods: PTs/PTAs were invited to complete an anonymous survey asking relative PT/PTA views, experiences, and understanding of patients’ marijuana use. Results: PTs/PTAs who have had experience (did not have experience) with patients who use marijuana received information about marijuana from news media - 61% (60%), patients …

The Effects Of Concussion On Tandem Gait Performance With Secondary Cognitive Tasks, Angel Lomeli

Cal Poly Humboldt theses and projects

Identifying concussions occurs with a battery of cognitive and motor tests. However, these tests are performed independently as primary tasks. Research has demonstrated amplified motor differences due to concussion when performing simultaneous cognitive tasks (i.e. dual-tasks). The Tandem Gait Test (TGT) is used in concussion assessment and has only moderate sensitivity and specificity alone. The aim of this study was to determine the effect of concussion on TGT performance with secondary cognitive tasks. Six concussed participants (age 22.6 ± 2.8) and fourteen healthy participants (age 23.8 ± 2.7) were recruited through the North Coast Concussion Program within 13 days (7 …

The Effect Of Stride Frequencies On Running Performance At The Velocity Of Vo2max, Boram Lim

Cal Poly Humboldt theses and projects

Running economy(RE) is considered to be a critical factor to improve running performance. Stride frequency(SF) is an important variable for determining RE. The importance of SF has gained more attention in recent years, especially for recreational runners. However, no previous research has investigated the interaction between running performance and SF at the velocity of VO₂max. PURPOSE: To investigate the effect of five different SF variations on running performance until volitional fatigue at the velocity of VO₂max. METHODS: Fourteen male recreational runners (Age = 25.8 ± 4.96 years, Height = 171 ± 6.2cm, Body Mass = 71.9 …

The Effect Of Workload Reductions On Anaerobic Work During High Intensity Running, Taylor Keith Kennon

Cal Poly Humboldt theses and projects

Anaerobic capacity has implications in health and sport. Sprint interval training improves anaerobic capacity, aerobic factors, as well as performance. Optimal durations for taxing anaerobic capacity have been shown to be 60 seconds, and have been elicited using the Anaerobic Speed Test. In order to maintain this optimal duration for multiple sets, a decreasing workloads method must be used as fatigue increases following each set. These work-loading methods must be compared to determine which protocol allows for the maximum exercise volume to be achieved. The purpose of this study was to compare the effects of three different workload protocols on …

The Health, Fitness, And Anthropometric Characteristics Of Firefighters On The North Coast Of California, Gil Spitz

Cal Poly Humboldt theses and projects

ABSTRACT

THE HEALTH, FITNESS AND ANTHROPOMETRIC CHARACTERISTICS OF FIREFIGHTERS ON THE NORTH COAST OF CALIFORNIA

Gil Spitz

Limited research has been conducted on the health-related physical fitness level of rural firefighters on the northern coast of California. The geographic isolation of rural firefighters creates unique challenges, including staffing shortages placing individual firefighters under unusual physiological stress.

PURPOSE: The purpose of this study was to examine the health-related physical fitness status of rural firefighters.

METHODS: 20 male firefighters (mean±sd, age = 32±7 yr, height = 180±5 cm, body mass = 96±16 kg, fire service = 9±7 yr) on the …

The Effects Of A Concussion On Dynamic Stability And Cognitive Performance During Single And Dual Task Tandem Gait, Erin Lodwick

Cal Poly Humboldt theses and projects

PURPOSE: It is estimated that between 1.6 and 3.8 million concussions occur in the United States every year during competitive sports. To limit the risk of returning an athlete to play too soon a sensitive and reliable assessment is needed. Static balance assessments that are used currently only detect very short term balance deficits (1-3 days). The purpose of this study is to examine the effects of a concussion on dynamic stability and more specifically if those effects are seen to a greater degree with the addition of a secondary cognitive task. METHODS: This study used 18 Humboldt State University …

Effects Of A Post-Activation Potentiation Warm-Up On Submaximal Parallel Back Squat Volume, Rating Of Perceived Exertion, Peak Velocity, And Peak Power, Carlton Wei

Cal Poly Humboldt theses and projects

Resistance training (RT) is effective for improving athletic performance, with specific training loads and volumes dictating the adaptations. A warm-up is necessary to safely and effectively engage in RT: typically with a low intensity aerobic activity, stretching, and movement specific potentiating exercises. Post-activation potentiation (PAP) acutely increases muscular power following a conditioning contraction, though limited research has assessed its use for RT. The purpose of this study was to assess how a PAP warm-up protocol affects volume, rating of perceived exertion (RPE), and peak velocity and power with 75%1RM in the barbell parallel back squat (PBS) exercise across 4 sets. …