Ryan Rhodes

Ryan Rhodes
University of Victoria | UVIC · School of Exercise Science, Physical and Health Education (EPHE)

PhD

About

535
Publications
142,304
Reads
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21,250
Citations
Introduction
Primary area of research is on the psychology of physical activity with an applied focus of physical activity promotion during critical life transitions such as parenthood and early family development. Dr. Rhodes is also one of the world experts on the intention-behavior gap. He has held over 100 grants for this research and he has contributed over 400 publications, 30 book chapters and two books.

Publications

Publications (535)
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Background Martial arts training has shown positive impacts on balance and physiological measurements. Further investigation of the contents and feasibility of an effective therapeutic assessment of martial arts is needed in older adults, mainly for future applications and real-world implementation. Methods Sixteen older adults (8 male, 8 female,...
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YouTube is the second-most visited webpage in the world and boasts over 2 billion users and 500 h of videos uploaded every hour. Despite this popularity, relatively few articles have discussed the practical use of searching and YouTube as a research tool and source of data. The purpose of our paper is to propose a step-by-step schematic for utilizi...
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Background Hand hygiene, facemask wearing, and physical distancing play a crucial role in the prevention of the COVID-19 pandemic. Identifying the key psychosocial determinants of these precautionary behaviors contributes to effective intervention and policymaking for COVID-19 and future pandemics. Purpose This study aimed to systematically review...
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Objectives This study assessed whether sleep and physical activity impact mental health and life satisfaction across the transition to parenthood. This study assessed the impact of parenthood on mental health of new parents and parents expecting their second child, and whether change in mental health occurred dyadically across couples. Design Long...
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Background: A challenge facing researchers conducting mobile health (mHealth) research is the amount of resources required to develop mobile apps. This can be a barrier to generating relevant knowledge in a timely manner. The recent rise of "no-code" software development platforms may overcome this challenge and enable researchers to decrease the...
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Objective: The COVID-19 pandemic saw promotion of novel virus transmission-reduction behaviours, and discouragement of familiar transmission-conducive behaviours. Understanding changes in the automatic nature of such behaviours is important, because habitual behaviours may be more easily reactivated in future outbreaks and disrupting old habits ma...
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Resistance training (RT) is a form of exercise that provides numerous health benefits. One barrier to participation may be the technical demands associated with some exercises. While recommendations for RT, including the number of repetitions, sets, rest, and training loads are established, recommendations for exercise selection have not been addre...
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Background Research indicates that perceived behavioral control (PBC) is an important determinant of behavior and that it is composed of perceived capability and opportunity. However, typical measurement of these constructs may be confounded with motivation and outcome expectations. Vignettes presented before questionnaire items may clarify constru...
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Purpose: Physical activity (PA), sedentary time (SED) and energy intake (EI) are associated with fat mass accrual in children and youth. Previous studies relied primarily on cross-sectional designs and proxy measures of body composition such as body mass index. We aimed to prospectively investigate associations between PA, SED, EI and total body f...
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24 h movement behaviors, specifically physical activity (PA), sedentary behavior, and sleep, play a crucial role in the prevention and intervention of childhood obesity. This study aimed to examine the association of 24 h movement behaviors with weight status and body composition among Chinese primary school children. Using a random stratified samp...
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Background Previous research suggests that there is a bidirectional relationship between incidental affect (i.e., how people feel in day-to-day life) and physical activity behavior. However, many inconsistencies exist in the body of work due to the lag interval between affect and physical activity measurements. Purpose Using a novel continuous-tim...
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Purpose The purpose of this review was to synthesize the empirical evidence of relevant studies related to preventive behaviors in response to the COVID-19 pandemic among children and adolescents. Further to this, we aimed to identify the demographic, psychological, and social and environmental correlates of such behaviors. Methods Following PRISM...
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The onset of motherhood is associated with a decline in moderate- to vigorous-physical activity (MVPA) and this deficit can remain for years to come. This study explored the feasibility of a web-based intervention, informed by the multi-process action control (M-PAC) framework, to promote PA in mothers. Forty-one inactive mothers of children <16 we...
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Objectives: Public health restrictions varied by region during the COVID-19 pandemic and reduced opportunities for children to be physically active. The purpose of this study was to assess regional differences in movement behaviours of Canadian children and youth during the second wave of the COVID-19 pandemic. Methods: A national sample of Cana...
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Physical distancing remains an important initiative to curb COVID‐19 and virus transmission more broadly. This exploratory study investigated how physical distancing behaviour changed during the COVID‐19 pandemic and whether it was associated with identity with virus transmission avoidance and physical distancing habit strength. In a longitudinal,...
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Introduction A dual process model based upon the affect and health behavior framework was used to explain sedentary behavior, where affective and instrumental components of implicit attitude were measured. Extending dual process theory, we assessed the moderating role of self-monitoring on the effects of implicit attitude on behavior. Method In St...
Preprint
BACKGROUND A challenge facing researchers when conducting mobile health (mHealth) research is the resources required to develop mobile apps. This can be a barrier to generating relevant knowledge in a timely manner. The recent rise of “no-code” software development platforms may overcome this challenge and enable researchers to decrease the cost an...
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User-centered developmental processes are critical to ensuring acceptability of e-health behavioral interventions, and yet physical activity research continues to be inundated with top-down developmental approaches. The IDEAS (Integrate, Design, Assess, and Share) framework outlines a user-centered process for development of e-health interventions....
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Mobile text messaging could be more effective for type 2 diabetes management when messages are designed and delivered according to patients’ needs and preferences. Communication-persuasion theories and message design approaches can provide a more useful guide to understanding patients’ message-specific preferences and developing the most relevant m...
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Background: Parents play a key role in young children's physical activity and physical literacy development. Little research has explored parent-focused interventions to improve young children's physical literacy. We examined if a theory-based, feasible physical literacy training workshop (PLAYshop) for parents could improve their physical literac...
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This investigation sought to examine physical activity (PA) as a potential determinant of chronic boredom and associated well-being within the context of COVID-related restrictions. A representative sample of U.K. adults ( N = 1,521) completed a survey on June 1, 2020. Bivariate analyses demonstrated that individuals who met guidelines and maintain...
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Background Many of the world’s population, across all age groups and abilities, are not meeting or even aware of internationally recommended physical activity (PA) and sedentary behaviour (SB) guidelines. In order to enhance awareness and uptake, guidelines should be perceived positively by targeted users. The purpose of this study was to review th...
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The purpose of our study was to describe characteristics of behavior change techniques (BCTs) employed by popular YouTube fitness channels and examine relationships between BCTs used and engagement metrics (e.g. views, likes, comments). Seventy-five videos were coded according to BCT Taxonomy v1. Multi-level modeling was conducted between BCTs and...
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BACKGROUND Hypertension (HT) is the leading modifiable risk factor for cardiovascular disease and mortality. Adopting lifestyle modifications, like increasing physical activity (PA), can be an effective strategy in blood pressure (BP) control, but many adults are not meeting PA guidelines. Financial incentive interventions have the power to increas...
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Objective: This study was designed to investigate the effects of collaborative, dyadic, and individual planning on moderate-to-vigorous physical activity (MVPA) in target person-partner dyads. Individual planning reflects an "I-for-me" planning of one person's behavior. Collaborative planning refers to joint planning of both dyad members' behavior...
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The gap between the decision to engage in physical activity and subsequent behavioral enactment is considerable for many. Action control theories focus on this discordance in an attempt to improve the translation of intention into behavior. The purpose of this mini-review was to overview one of these approaches, the multi-process action control (M-...
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The aim of this study was to apply the Multi-Process Action Control model to examine how the additions of regulatory and reflexive processes predict physical activity (PA) behaviors among adolescents. Our sample included 1,176 Grade 11 students ( M age = 15.85 ± 0.38) recruited from a large school board in Southern Ontario. Participants completed a...
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UNSTRUCTURED Following the UN’s High Commissioner’s request for a moratorium on the use and adoption of specific Artificial Intelligence (AI) systems that pose serious risk to human rights, this commentary explores the current environment and future implications of using third-party wearable technologies in research for participants’ data privacy a...
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Background Regular muscle and bone strengthening activities through resistance training (RT) have been associated with numerous health benefits, particularly as adults age, yet participation is low. Effective promotion is likely founded on an understanding of theory-based correlates, yet almost all RT research has focused on college-aged convenienc...
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Social marketing campaigns promoting moderate to vigorous physical activity (MVPA) may be more successful when associated with strong brands. Little is known regarding how brand constructs such as brand resonance may be related to MVPA and its antecedents (e.g., having a physical activity identity). A better knowledge of these constructs and their...
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Background: Precursors driving leisure-time sedentary behaviors remain poorly investigated, despite their detrimental consequences. This study aimed to investigate the predictive validity of controlled and automatic motivational precursors toward reducing sedentary behaviors and being physically active on leisure-time sedentary behaviors. The influ...
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Physical activity behaviour displays temporal variability, and is influenced by a range of dynamic psychological processes (e.g., affect) and shaped by various co-occurring events (e.g., social/environmental factors, interpersonal dynamics). Yet, most physical activity research tends not to examine the dynamic psychological processes implicated in...
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Introduction: While previous quantitative research has determined that executive function is malleable to sport participation, executive functioning in sport has not yet been investigated qualitatively in elite university athletes' sport experiences. Understanding the executive processes used in sports from an athletes ' perspective is vital to cre...
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Introduction: Physical activity and sport have been found to have a beneficial effect on executive function, while concussion history may have a detrimental effect. Previous research has yet to investigate the combined effects of leisure-time physical activity, sports participation and concussion history utilizing a comprehensive, remote assessment...
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Background Cognition-based theories dominate physical activity (PA) research, and many include a construct broadly defined as “beliefs about the consequences of behavior” (e.g., outcome expectancies, perceived benefits) hereafter referred to as perceived consequences. Purpose With the quantity of available research on this topic, it is important t...
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A clear rationale can be made for promoting long-term regular physical activity (PA), yet despite some attempts to operationalize “maintenance,” no robust definition has been agreed upon, beyond arbitrary time frames of regular PA. This has likely impaired the advancement of theory and practice. The purpose of this critical narrative review was to...
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Background: Exercising at a consistent versus variable time of day cross-sectionally relates to greater moderate to vigorous physical activity (MVPA) among weight loss maintainers. This study evaluated the relationships between exercise timing and both MVPA levels and habit strength, as well as stability in exercise timing, over 1 year among maint...
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Daily life has changed for families due to the COVID-19 pandemic. The aim of this repeated cross-sectional study was to describe movement behaviours in Canadian children and youth 6 months into the pandemic (T2; October 2020) compared with the start of the pandemic (T1, April 2020). An online survey was distributed to parents (N = 1568) of children...
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In light of new evidence on the prevention of chronic diseases and the elevated rates of overweight and obesity in Brazil and Canada, this critical review aims to interpret and synthesize current aspects regarding dietary and physical activity initiatives in both countries and make future recommendations. The pioneering work presented in the last B...
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Daily life has changed for families due to the COVID-19 pandemic. The aim of this repeated cross-sectional study was to describe movement behaviours in Canadian children and youth six months into the pandemic (T2; October 2020) compared with the start of the pandemic (T1, April 2020). An online survey was distributed to parents ( N = 1568) of child...
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Objective: The effectiveness of physical activity interventions is typically evaluated using null hypothesis significance testing or conventional interpretations of effect size (i.e., "small," "medium," or "large"). As these criteria have recently attracted criticism, we conducted a quantitative integration of meta-analyses (a metasynthesis) in or...
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Background: In response to the COVID-19 pandemic, experts in mental health science emphasized the importance of developing and evaluating approaches to support and maintain the mental health of older adults. Objective: To assess whether a group-based exercise program relative to a personal exercise program (both delivered online) and wait-list c...
Preprint
This study involved the design and evaluation of the High-Intensity Interval Training Self-Efficacy Questionnaire (HIIT-SQ). Phase 1: Questionnaire items were developed. Phase 2: Australian adolescents (N = 389, 16.0 ± 0.4 years, 41.10% female) completed the HIIT-SQ, and factorial validity of the measurement model was explored. Phase 3: Adolescents...
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Background Intention is theorized as the proximal determinant of behavior in many leading theories and yet intention–behavior discordance is prevalent. Purpose To theme and appraise the variables that have been evaluated as potential moderators of the intention–physical activity (I-PA) relationship using the capability–opportunity–motivation– beha...
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Introduction: The demands of parenthood may limit the pursuit of moderate-to-vigorous intensity physical activity (MVPA), establish inactivity patterns into middle age, and lead to long-term poorer health and well-being. The purpose of this study was to examine the efficacy of a couple-based planning skills intervention to support MVPA from baseli...
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Rationale The demands of early parenthood may limit the pursuit of moderate-to-vigorous intensity physical activity (MVPA); thus, understanding the predictors of MVPA among this population could help build targeted intervention programs. Objective: The purpose of this study was to examine the correlates of MVPA, in the form of constructs subsumed w...
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Background: The Physical Activity Readiness Questionnaire for Everyone (PAR-Q+) is the international standard for pre-participation risk stratification and screening. In order to provide a practical and valid screening tool to facilitate safe engagement in physical activity and fitness assessments for the Brazilian population, this study aimed to t...
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This two-part study examined Dweck’s psychological needs model in relation to exercise-related well-being and particularly focused on the basic need for optimal predictability and compound needs for identity and meaning . In Part 1 ( N = 559), using exploratory factor analysis, scores derived from items assessing optimal predictability (prediction...
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Objective: Dog owners walk more per week compared to non-dog owners; however, 60% of dog owners are still not walking their dogs at intensities sufficient to reap optimal health benefits. The aim of this study was to evaluate the feasibility, acceptability, and efficacy of a 9-week randomized controlled trial involving a program of six weekly sched...
Preprint
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BACKGROUND In response to the COVID-19 pandemic, experts in mental health science emphasized the importance of developing and evaluating approaches to support and maintain the mental health of older adults. OBJECTIVE The aim of this study was to assess whether a group-based exercise program relative to a personal exercise program (both delivered o...
Preprint
Full-text available
Background: To test the efficacy of a documented 5-week karate training intervention for rehabilitation and neuroprotection in older adults. Methods: Sixteen older adults (8 male, 8 female, age 59-90y), with or without chronic conditions, participated a 5-week karate training intervention. Dynamic balance, hand grip, ankle plantarflexion force, Tim...
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Skin cancer is highly burdensome, but preventable with regular engagement in sun protective behaviors. Despite modest effectiveness of sun-protective behavior promotional efforts thus far, rates of engagement in sun-protective behaviors remain low. More is needed to understand motivation for using sunscreen, wearing sun-protective clothing, and see...
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Background With an increasing volume of research exploring the pathways linking greenspace exposure to mental health, there is a need to synthesise the strength of evidence on the mediation mechanisms. Synthesising the strength of evidence on the pathways can help us better understand how greenspace exposure affects mental health and guide future g...
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Aim: Most Canadian and Australian children do not meet Physical Activity Guidelines (PAG) or Screen Time Guidelines (STG). Regarding the social issue advertising believability model (SIABM), parental support for these behaviours may depend upon how believable parents find guideline messages. The aim of the study was to examine differences in paren...
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Background Exercise identity is an important predictor for regular physical activity (PA). There is a lack of research on the potential mechanisms or antecedents of identity development. Theories of exercise identity have proposed that investment, commitment and self-referential (eg, I am an exerciser) statements, and social activation (comparison,...
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Objective: To examine the psychological mediators of exercise adherence among older adults in a group-based physical activity randomized controlled trial. Method: Older adults (≥65 years) were randomized to one of three conditions as part of the "GrOup-based physical Activity for oLder adults" (GOAL) randomized controlled trial. These included s...
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Introduction: Strength and balance exercises prevent falls. Yet, exercise adherence is often low. To maximize the benefit of exercise on falls prevention, we aimed to identify baseline cognitive and mobility factors that predict adherence to the Otago Exercise Program (OEP) - a home-based exercise program proven to prevent falls. Methods: We con...
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Participation in dog agility may strengthen the bond between dog owners and their dogs and provide a reason for increasing physical fitness, thus increasing physical activity behavior. The purpose of this study was to compare physical activity levels (performed both with their dogs and without their dogs) of agility trainers with non-agility traine...
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Background Noncommunicable diseases (NCDs) are associated with the burden of premature deaths and huge medical costs globally. There is an increasing number of studies combining a multiple health behavior change (MHBC) intervention paradigm with eHealth approaches to jointly promote weight-related health behaviors among people with NCD; yet, a comp...
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Family-based physical activity (PA) interventions have proven effective in modifying PA; yet, the underlying mechanisms are currently unclear. In this study, we follow-up upon prior trial data that showed changes to child moderate-to-vigorous PA (MVPA) as a result of a family education+planning intervention compared to an education-only condition....
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Objective We identified adherence-based case-mixes from participants’ longitudinal adherence to falls prevention exercise interventions over 12 months. Second, we identified modifiable baseline predictors (cognition, mobility and functional status) based on case-mix adherence trajectories. Study design and outcome measures This study was a 12-mont...