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Spinal Motor Neuron Excitability And Balance Control Changes Following Downslope Walking, Nikki Aitcheson-Huehn

Theses and Dissertations (Comprehensive)

Downslope walking (DSW) has been proposed as a rehabilitation tool for people with Multiple Sclerosis (PwMS) although there are mixed findings in young adults (YA) regarding the balance control changes, despite both populations experiencing depressed spinal motor neuron (MN) pool excitability. Our aim was to determine whether YAs could demonstrate improved balance control in conjunction with SOL H reflex depression (estimate of spinal MN excitability) following DSW. We also aimed to determine whether reciprocal inhibition was a potential mechanism for H reflex depression via conditioned SOL H reflexes. Thirty young adults (23±1.4y, 6 males) were assigned to 30-minutes of DSW …

The Nature Of Informal Roles In Interdependent Sport Teams, Jeemin Kim

Theses and Dissertations (Comprehensive)

The degree to which athletes understand and execute their formal role responsibilities (i.e., prescribed by coaches) is important for individual and group functioning (Eys, Schinke, Surya, & Benson, 2014). Recent literature suggested that informal roles can emerge within sport teams more naturally without coaches’ explicit assignments (e.g., team comedians, distracters), and have significant influences on team functioning (Cope, Eys, Beauchamp, Schinke, & Bosselut, 2011). This doctoral dissertation examined the nature of informal roles within interdependent sport teams, focusing on their antecedents and outcomes. Three separate projects were conducted. Project One examined athletes’ personality in the big five dimensions (McCrae & …

A Qualitative Investigation Into The Influence Of A Mental Health Physical Activity Intervention On University Students, Heather M. Tunks

Theses and Dissertations (Comprehensive)

Objective

Among the university student population, mental illnesses are highly prevalent. Adults aged 20-30 years have the highest rates of mood and anxiety disorders than any other age group, with approximately 12.0% diagnosed with an anxiety disorder and 7.0 to 9.0% experiencing clinical depression (Nunes et al., 2014; Pedrelli, Nyer, Yeung, Zulauf, & Wilens, 2015). Reducing or preventing the effects of mental illness among this population may have lifelong implications including improvements in coping and management of mental illness throughout the lifespan(Jaworska, DeSomma, Fonseka, Heck, & MacQueen, 2016). This research examines the lived experiences of volunteers and participants in a …

“This Is My Little World…”: Navigating The Group Exercise Experience Of Stay-Fit Members, Olivia Jones

Theses and Dissertations (Comprehensive)

Objective

Cancer is the leading cause of death in Canada, with one in two Canadians expected to develop cancer over their lifetime (Canadian Cancer Society, 2019). Exercise is reportedly a safe therapy to help ease the common side effects of cancer and its treatments (Schmitz et al., 2010). Past research has shown the benefits of group exercise while in treatment for cancer, but there is a dearth of research regarding the impact of long-term group exercise programming for cancer survivors. This phenomenological study explored the lived experiences of group exercise participation for individuals who previously had cancer and were enrolled …

Temporal Observations Of Role Clarity And Cohesion Perceptions, Erica Mclean

Theses and Dissertations (Comprehensive)

Two important aspects of sport group functioning that influence both individual and group outcomes (e.g., athlete satisfaction, team performance; Eys et al., in press) are cohesion and role clarity. Despite evidence surrounding the role clarity-cohesion relationship (e.g., Bosselut, McLaren, Eys, et al., 2012), the dynamism of these variables over time remains unclear. The purpose of this thesis was to explore cohesion and role clarity perceptions over the course of a youth ringette season through a longitudinal study design. Female ringette athletes (N = 86, Mage = 15.3, SD = 1.6) were surveyed every three weeks throughout the ringette sport season, …

The Days, Months, And Years After The Last Game: Retirement In Canadian Student-Athletes, Melissa Pare

Theses and Dissertations (Comprehensive)

According to the National Collegiate Athletic Association (NCAA), 98% of student-athletes will retire from sport during and/or after their collegiate career (NCAA, 2015) from one of four causes (e.g., eligibility, deselection, injury, or choice) and this number is even higher in Canadian student-athletes. Athlete retirement has been widely studied across professional and elite athletes using multiple theoretical models (Schlossberg, 1981; Stambulova, 1997; Taylor & Ogilvie, 1994); however, student-athletes’ experiences are not widely studied. Furthermore, Canadian university sport (U SPORTS) does not currently have programs or services dedicated to support student-athletes through retirement. The purpose of this cross-sectional qualitative study was …

Let Me Tell You About A Time: Exploring How Storytelling And Memory Affect Behavioural Interview Performance Ratings, Sara A. Murphy

Theses and Dissertations (Comprehensive)

Behavioural interviews continue to be a popular selection tool used in industry today. Although the literature finds that behavioural interviews are reliable and valid selection tools, two fundamental elements of behavioural interviewing have been overlooked. Specifically, behavioural interview ratings are based on how much detail candidates retrieve about their experiences as well as their ability to effectively convey those details to interviewers. I hypothesize that autobiographical memory predicts interview performance ratings and that storytelling mediates this relationship. In addition, I expect that the presence of probing questions will moderate the mediated relationship. Study 1 tests these hypotheses using a laboratory …

Examining The Effect Of Exercise Intensity On Post-Exercise Hypotension In Middle-Aged Adults, Seth F. Mccarthy

Theses and Dissertations (Comprehensive)

Acute bouts of exercise have a transient lowering effect on systolic blood pressure (SBP) and diastolic blood pressure (DBP) in the hours after termed post-exercise hypotension (PEH). While moderate-intensity continuous training (MICT) is effective in reducing BP acutely, little is known regarding the effects of higher intensity exercise. This study examined the effects of different exercise intensities on PEH. Six participants (females: 4; age: 48±9 y, Mean arterial pressure: 84±8 mmHg) had their BP measured before and both immediately post- (<2 h) and for 24 h following 4 experimental sessions: 1) 30 min MICT (65% V̇O_2max); 2) 20 min high-intensity interval training (HIIT; 10 x 1 min @ 90% HR_max with 1 …

Concussions In Minor League Hockey Players: The Impact Of Rowan’S Law On Coaches, Niya St Amant

Theses and Dissertations (Comprehensive)

Claims makers in the social problem game successfully constructed youth sporting concussions in Ontario as a social problem in need of remedying after the death of 17-year old Rowan Stringer on the rugby field in 2013. Rowan’s Law was implemented five years later in 2018 to attempt to identify and manage youth concussion injuries. The present study explores the impact of Rowan’s Law on coaches in minor league hockey at the triple A Bantam (U15) and Midget (U17) levels. The goal of this study was to determine if the policy change of Rowan’s Law was facilitating change on the cultural …

More Than Just A Rapper: Mainstream And Alternative Media’S Depiction Of Nipsey Hussle, Jonathan Hazlewood

Theses and Dissertations (Comprehensive)

Mainstream and alternative media depict individuals differently from one another. In stories covering African American rappers and homicide victims, mainstream and alternative stories use images, phrases, and people to portray certain ideas to their audience. In terms of mainstream news outlets, stories associate criminality onto African American homicide victims and rappers through labeling them as brutes, focusing on the crimes they commit, and highlighting criminal associations (Aquil, 2018; Cochran, 2015; Dukes & Gaither 2018; Wright & Washington, 2019). While alternative outlets have offered sympathetic and well-rounded representations that depict the life, personal accomplishments, and good deeds of an African American …

Environmental Goal Misalignment Between Logistics Service Providers And Shippers, S.M. Mehdi Jourabchi

Theses and Dissertations (Comprehensive)

The ongoing debate about who, ultimately, should pay for greening the transportation industry has exposed a gap (i.e. misalignment) between logistics companies and their clients (shippers). This thesis examines this gap in detail.

Study 1 utilizes conceptual theory building to discuss the conditions under which closer environmental collaboration between logistics service provider (LSP) and shipper can be realized within the supply chain. Our theoretical framework discusses the misalignment of LSPs’ and shippers’ incentives regarding green initiatives. Our conceptual framework aims to address the general dependency of LSPs on shippers and to assess whether and when it can be converted …

Effects Of An Acute Session Of High- Vs Low-Load Resistance Training Exercise On Energy Balance, Daniel Grisebach, Derek Pd Bornath, Abigail A. Broad, Seth F. Mccarthy, Tom J. Hazell

Theses and Dissertations (Comprehensive)

This study examined the effect of an acute session of low-load high-volume resistance training versus a more traditional high-load low-volume session on energy balance (EB). Five recreationally active males (age: 24±3 y; BMI: 25.8±1.5 kgm^-2) completed three different sessions: 1) high-load (90% 1RM); 2) low-load (30% 1RM); and 3) CTRL (no exercise). Gas exchange (V̇O₂), blood lactate, and subjective appetite perceptions were measured before each session, as well as at 0, 1, and 2 h post-exercise. Delayed onset muscle soreness (DOMS) in the quadriceps, pectorals, hamstrings, deltoids, and latissimus dorsi was measured at 24 and 48 …

Investigation Of Rna Interference (Rnai)-Mediated Gene Silencing In Rainbow Trout, Sarah Au

Theses and Dissertations (Comprehensive)

RNA interference (RNAi) was first characterized in plants and invertebrates as an antiviral innate immune response. It is a natural antiviral defence mechanism to degrade viral RNA by virus-induced gene silencing. Studies showed synthetic long double-stranded RNA (dsRNA; >30bp) degraded Caenorhabditis elegans messenger RNA (mRNA) transcripts, resulting in sequence-dependent gene silencing. Currently, there is only limited research on RNAi in fish, particularly the use of long dsRNA to trigger sequence-specific gene silencing. This is because studies have shown long dsRNAs trigger interferon response that could mask gene-specific RNAi effects. This thesis explored long dsRNA-mediated RNAi pathways in rainbow trout cells …

Can Zooplankton On The North American Great Plains ‘Keep Up’ With Climate-Driven Salinity Change?, Mariam Elmarsafy

Theses and Dissertations (Comprehensive)

The Great Plains of North America are projected to become more arid as the climate changes over the next century. Salinity levels for lakes in this region are linked to climate, suggesting that lakes will become more saline as the climate becomes drier. One group of organisms that might be affected by increased salinity levels are the zooplankton, aquatic invertebrates that transfer energy from primary producers to macroinvertebrates and fish. Little is known about the ability of zooplankton to adapt to long-term increases in lake salinity levels. For my thesis, I used resurrection ecology to examine how a common zooplankter, …

Flipping The Exercise Narrative: An Exploration Of Middle-Aged Adults’ Lived Experiences After Making A New Year’S Resolution To Exercise, David Mcilwraith

Theses and Dissertations (Comprehensive)

Abstract

Objective

The benefits of consistent exercise in the middle-aged adult (44 to 64 years) population has been well documented in existing literature; exercise can delay the onset and progression of a wide variety of chronic diseases such as diabetes, hypertension, osteoporosis, cardiovascular disease and, more generally, premature mortality (Dietz et al., 2016; Thornton et al., 2016; Waschki et al., 2015). Despite increased societal awareness surrounding the importance of exercise in relation to long-term health and longevity, middle-aged adults remain largely inactive. Additionally, there have been few studies that have used a qualitative methodology to give middle-aged adults an active …

Effects Of Phosphorus On Mycorrhizal Colonization Of Wetland Plants Under Natural And Controlled Conditions, Miriah Tucker

Theses and Dissertations (Comprehensive)

An important symbiotic relationship that forms in wetland environments occurs between plants and arbuscular mycorrhizal fungi (AMF). In terrestrial communities AMF colonization is limited by phosphorus; excessive phosphorus can lead to an uncoupling of the relationship. Few studies have examined the relationship between AMF and phosphorus concentration in wetland plants. The studies that have, found a decrease in AMF colonization at phosphorus concentrations as low as 0.03 mg/L P, however, methodological issues limit the interpretation of these results. To address this, a field and greenhouse study were completed using more realistic exposure conditions, field deployable assays (FDA), and natural intact …

Investigating Diel, Seasonal, And Interannual Variability Of Dissolved And Particulate Stable Carbon Isotope Values In A Eutrophic Boreal Lake, Rachel Henderson

Theses and Dissertations (Comprehensive)

Lakes are globally significant sources, sinks, and conduits of carbon. Cultural eutrophication of freshwater promotes the growth of phytoplankton blooms, which can transform, respire, and sequester large amounts of carbon. Analysis of stable carbon isotopes is a common tool to study the movement of carbon through the aquatic carbon cycle. The causes of temporal variability in δ¹³C values at different timescales are not well understood, and differ between lakes. In this study, I investigated diel, seasonal, and interannual variability in δ¹³C values of dissolved inorganic carbon (DIC) and particulate organic carbon (POC) in Lake 227, an …

The Effects Of Dorsal Lateral Telencephalon Lesions On Zebrafish Social Behaviour, Hailey Katzman

Theses and Dissertations (Comprehensive)

Zebrafish are extremely social and aggregate in groups to form shoals. This social behaviour has been studied in the wild and in a laboratory setting, yet the mechanisms underlying the behaviour are unknown. There is evidence to suggest that the dorsal lateral telencephalon might play a role in shaping shoaling behaviour, being involved in modulating social behaviours and social reward associated with shoaling. In the current thesis, I adapted and combined several existing methods for performing lesions on the dorsal lateral telencephalon to create my own method to measure the role of the dorsal lateral telencephalon in social reward and …

What Is It About Coda And Will? Exploring The Experiences Of School Social Workers Using Canine-Assisted Therapy In Their Clinical Practice With Students., Suzanne Mcdermid

Theses and Dissertations (Comprehensive)

This research project explores the experiences of school social workers partnering with trained, accredited facility dogs in an Ontario school board. A qualitative research methodology using an interpretative phenomenological analysis has been employed. Results reveal that organizational support is key to the successful integration of facility dogs in clinical social work practice within a school board. Environmental considerations allow for the establishment of therapeutic conditions that support positive interactions and interventions with a canine. Findings clarify three dimensions of canine-assisted therapy: connection, attunement and the handler-canine relationship. Connection is the ‘magic’ of canine-assisted therapy, the essence of an interaction between …

Examining Gender Differences In Perceptions Of Pay Negotiation And Remuneration Among Late-Adolescents, Meghan Borg

Theses and Dissertations (Comprehensive)

Documented gender differences exist between males and females in terms of preparedness for the workforce in financial knowledge obtained from both family and educational sources (e.g., Danes & Haberman, 2007; Saari, Wood, & Wood, 2017), and the ways in which they negotiate (or fail to negotiate) for higher pay (e.g., Babcock, Gelfand, Small, & Stayn, 2006; Kugler et al., 2018). The current study extends this literature by investigating factors associated with Canadian late-adolescents’ preparedness for work by documenting work experiences (both casual and formal), remuneration experiences, and negotiation experiences as a function of gender. In total, 268 participants (137 females) …

Narrating A Conscientization Journey On Crime Prevention Through Social Development, Carlos Luis Zatarain

Theses and Dissertations (Comprehensive)

There is an increasing interest among municipalities to address crime through prevention as social development (CPSD) that acknowledges the underlying social conditions that influence the occurrence of crime. This requires a critical consciousness among community members and decision-makers of the root causes of crime and critical action that reflect that understanding. This, in turn, implies both a significant mental and cultural shift requiring personal transformation. Only then can the appropriate actions towards a preventative approach to crime be effectively fostered. For this purpose, the Waterloo Region Crime Prevention Council developed a community course titled Reframing Crime, Justice, and Prevention that …

Reconstructing Hydrologic Conditions And Metals Supplied By The Peace River To The Peace-Athabasca Delta, Jelle André Faber

Theses and Dissertations (Comprehensive)

The Peace-Athabasca Delta (PAD) in northern Alberta, Canada, is recognized internationally for its ecological, historical, and cultural significance. The delta is mostly within Wood Buffalo National Park, a UNESCO World Heritage Site, and is a Ramsar Wetland of International Importance. The construction of the WAC Bennett Dam (1967) and the Site C Dam (ongoing, 2024) on the Peace River, and expansion of the Alberta Oil Sands industry along the Athabasca River have raised concerns over water quantity and quality in the delta. When industry operations began, effective monitoring had not been implemented. Consequently, pre-industrial reference conditions are unknown and can …

Synthesis And Biophysical Analysis Of The Cell-Penetrating Peptide Penetratin And Its Aromatic Analogues, An Le

Theses and Dissertations (Comprehensive)

Cell-penetrating peptides (CPPs) interact with biological membranes, undergo cellular intake/uptake, and may act as potential drug delivery agents. Understanding the molecular interactions of these peptides with membranes contributes to gaining a better knowledge of their potential use in medical and pharmaceutical applications to improve human health. The current research focuses on understanding the mechanisms of a CPP in interaction with different model phospholipid membranes. The peptide penetratin (primary sequence: RQIKIWFQNRRMKWKK) is an example of a CPP that can interact with and pass through biological membranes. The current thesis provides spectroscopic and calorimetric evidence that penetratin associates with lipid membranes. Circular …

Victimized And Criminalized Black Women’S Experiences With The Police In The Context Of Intimate Partner Violence, Patrina Duhaney

Theses and Dissertations (Comprehensive)

This qualitative, multi-manuscript dissertation examines the experiences of Black women who live in the Greater Toronto Area and other southwestern Ontario regions who have experienced intimate partner violence (IPV), some of whom were also charged with an IPV-related offence. Semi-structured interviews were conducted with 25 Black women to better understand the meanings they attach to their experiences. Critical race feminism (CRF) was employed to help conceptualize women’s narratives. In addition, the dissertation includes a review of the relevant literature, the methodology that was utilized for the study followed by three self-contained manuscripts. The purpose of the first manuscript is to …

Functional Characterization Of Proteins From A Putative Chondroitin Sulfate A Degrading Operon And The Crystal Structure Of An Exo-N-Acetylgalactosamine-4-Sulfatase From Tannerella Forsythia, Peter Nguyen

Theses and Dissertations (Comprehensive)

Advanced periodontitis has been shown to have strong associations with the residence of a bacterial triad of Porphyromonas gingivalis, Tannerella forsythia, and Treponema denticola also known as the red complex. These bacteria were previously thought to be asaccharolytic, making them better suited to survive in deep in periodontal pockets where access to carbohydrates from food is limited. Information gathered from genomic analysis suggested that upregulation of an operon (BFO2285-BFO2295, BFO3043) could confer the capacity for T. forsythia to degrade chondroitin-4-sulfate, the principle glycosaminoglycan of alveolar bone tissue. Bioinformatics analysis suggested the operon was similar to an operon found in Bacteroidetes …

Hydrogen Peroxide: A Grower’S Best Friend?, Mitchell Eicher-Sodo

Theses and Dissertations (Comprehensive)

Hydrogen peroxide (H₂O₂) is an oxidizing agent used to disinfect irrigation systems (e.g. nutrient solution and equipment) used in controlled environment plant production and produces no harmful by-products. The action of H₂O₂ is non-selective, and therefor H₂O₂ will oxidize all components of the irrigation water as well as tissues from the greenhouse crops being irrigated. The phytotoxic effect H₂O₂ has on common greenhouse crops is not well understood, requiring detailed characterization and determination of threshold concentrations. Thresholds within the thesis were based on applied H₂O …

Reducing Meat Consumption: Drawing On Participatory Action Research To Explore Ways Of Engaging In A Process Of Meat Consumption Reduction, Brittany Spadafore

Theses and Dissertations (Comprehensive)

With growing attention to climate change and human impacts on the environment, an emerging body of literature is exploring the impacts of global reliance on meat consumption. Research is increasingly supporting the feasibility of reducing meat consumption to address the environmental pressures of the global food system. However, recommended strategies to promote a reduction in meat consumption have been limited due to narrowly focusing on individual rational decision-making models. Centralizing a Social Practice theoretical lens, the present study utilized an approach to participatory action research to explore the experiences of seven (N = 7) green-building tenants reducing their meat consumption …

Using Our Past To Predict Our Future: Applying Reference Class Forecasting To Debias Individual Project Completion Predictions, Rebecca Friesdorf

Theses and Dissertations (Comprehensive)

People often predict that they will finish projects sooner than they actually do, i.e., exhibit the planning fallacy (e.g., Buehler et al., 2010). This bias has important consequences for everyday life, including failure to meet deadlines, taking on too many projects, and increased stress. Several solutions have been proposed, including interventions which ask individuals to take an “outside view” (e.g., Kahneman & Lovallo, 1993), such as using information from past completion times to make predictions for a current project (e.g., Buehler et al., 1994). In this work, we take a novel approach to helping individuals use past project information: recalling …

Aggregate Loss Model With Poisson-Tweedie Loss Frequency, Si Chen

Theses and Dissertations (Comprehensive)

The aggregate loss model has applications in various areas such as financial risk management and actuarial science. The aggregate loss is the summation of all random losses occurred in a period, and it is governed by both the loss severity and the loss frequency. While the impact of the loss severity on aggregate loss is well studied, less focus is paid on the influence of loss frequency on aggregate loss, which motivates our study. In this thesis, we enrich the aggregate loss framework by introducing the Poisson-Tweedie distribution as a candidate for modelling loss frequency, prove the closedness of Poisson-Tweedie …

A Housing First Model For Youth And Its Relation To Social Integration, Alexandra Amiri

Theses and Dissertations (Comprehensive)

The present study explored how a Housing First for Youth intervention, working from an empowerment theory approach, influences the social integration of youth experiencing homelessness. This was done by contrasting between groups of individuals who either did or did not receive the intervention. The sample consisted of 86 youth in the city of Ottawa between the ages of 17-24 who were randomized into the intervention (n=44) or treatment as usual group (n=42). Quantitative data from baseline and 6-month follow-up were analyzed using the Community Integration Scale (CIS) and Multidimensional Scale of Perceived Social Support (MSPSS). Repeated measures ANOVA revealed an …