Steven Russell Bray

Background GERAS DANcing for Cognition and Exercise (DANCE) was developed with rehabilitation and geriatric medicine expertise for older adults (age 60R

Background: Many adults are insufficiently active, posing a threat to public health. Research shows steep declines in physical activity during the emerging adulthood period. Psychological and socioenvironmental factors have been shown to be independently associated with engaging in physical activity. However, few studies have examined the cross-domain interactions between psychological and socioenvironmental factors on physical activity in real time. Real-time data collection methods can be leveraged alongside traditional nomothetic methods to gain a more comprehensive understanding of how physical activity is affected by dynamic changes to one’s unique psychological and contextual state within a day. Objective: This paper describes the protocol for a study aiming to examine independent and interactive associations between psychological and contextual factors and real-time physical activity in emerging adults. Ecological momentary assessment (EMA) and device-based monitoring of physical activity will be used. Methods: The SCOPE (Studying COntextual and Psychological predictors of physical activity among Emerging adults) study will use an intensive longitudinal study design. A total of 124 emerging adults will be recruited, completing 2 waves of data collection consisting of an online survey followed by 7 days of EMAs 6 months apart. EMA surveys will be administered using the Pathverse smartphone app, and physical activity will be assessed using a Fitbit Versa 4 activity monitor. Results: The study was approved by the research ethics board at the University of Waterloo in November 2025. Recruitment and enrollment began in December 2025, and complete T1 data from 69 participants have been collected as of February 2026. It is expected that T1 data collection will be completed by April 2026, and T2 data collection will occur between June and October 2026. Data analysis on T1 data is expected to begin in May 2026. We anticipate results to be published in fall 2027. Conclusions: Exploring real-time associations between psychological and socioenvironmental factors and physical activity will provide a more comprehensive understanding of the dynamic barriers and facilitators influencing individuals’ engagement in physical activity in their everyday lives. The outcomes of this work will help advance existing theories on behavioral choice and effort minimization and inform the development of decision rules for adaptive interventions that are tailored to individuals’ unique and current context.

Mental fatigue is a psychobiological state induced by sustained effortful cognitive efforts during daily life activities. Yet research efforts in exercise science have focused primarily on performance implications for athletes to the point of exclusion of vulnerable populations for which mental fatigue may be a health risk. This narrative review aims to clarify the role of mental fatigue on population health. Evidence suggest mental fatigue predisposes people to acute events related to temporary performance impairments (e.g., falls), and chronic diseases related to sedentarism (e.g., stroke, diabetes), as mental fatigue de-motivates people to engage in physical activity. Major risks are experienced by people with higher fatigability (i.e., people for whom mental fatigue is induced by less effortful tasks) and lower performance capacity. However, the few available information about moderators of fatigability and the lack of a normative protocol to assess mental fatigue are limiting the prevention of mental fatigue. Several strategies are used to counter mental fatigue acutely (e.g., caffeine ingestion); however, enduring countermeasures intended to alter psychobiological sequelae of mental fatigue, such as Brain Endurance and other trainings, are the only proved long-term countermeasures for mental fatigue. Yet the effectiveness of these interventions should be tested in populations with major risk for mental fatigue. We present a model identifying putative pathways through which mental fatigue may contribute to health risks to guide future investigations seeking to (a) evaluate the role of mental fatigue as a threat to health and well-being and (b) design interventions to mitigate the effects of mental fatigue in vulnerable populations.

BACKGROUND Many adults are insufficiently active, posing a threat to public health. Research shows steep declines in physical activity during the emerging adulthood period. Psychological and socio-environmental factors have been shown to be independently associated with engaging in physical activity; however, few studies have examined the interactive effects of psychological and contextual factors on physical activity. Furthermore, real-time data collection methods can be leveraged alongside traditional nomothetic methods to gain a more comprehensive understanding of how physical activity is affected by dynamic changes to one’s unique psychological and contextual state within a day. OBJECTIVE The present paper describes the protocol for a study aiming to examine independent and interactive associations between psychological and contextual factors and real-time physical activity in emerging adults. Ecological momentary assessment and device-based monitoring of physical activity will be used. METHODS The SCOPE study will use an intensive longitudinal study design. One hundred and twenty-four emerging adults will be recruited, completing two waves of data collection consisting of an online survey followed by seven days of ecological momentary assessments six months apart. Ecological momentary assessment surveys will be administered using the Pathverse smartphone application and physical activity will be assessed using a Fitbit Versa 4 activity monitor. RESULTS The study was approved by the research ethics board at the University of Waterloo in November 2025. Recruitment and enrollment are expected to begin in Fall 2025 with T1 data collection occurring between November 2025-April 2026 and T2 data collection occurring between May 2026-October 2026. CONCLUSIONS Exploring real-time associations between psychological and socio-environmental factors and physical activity will provide a more comprehensive understanding of dynamic barriers and facilitators of engaging in physical activity in people’s everyday lives. The outcomes of this work will help advance existing theories on behavioral choice and effort minimization and inform the development of decision rules for adaptive interventions that are individually tailored to one’s unique and current context.

Background: Combined cognitive and physical training develops resilience to mental fatigue, reduces perceived effort, and improves endurance exercise performance when compared to physical training and no training. The isolated contribution of cognitive training toward endurance performance has yet to be determined. Accordingly, we examined the effects of separate cognitive training on endurance exercise performance. Method: Two studies employed a pre-test/training/post-test design, with participants randomly assigned to cognitive training or control groups. At pre-test and post-test, participants completed a rhythmic handgrip task (Study 1) or a graded exercise test on a cycle ergometer (Study 2). In Study 1, the cognitive training group completed 20 sessions (four 20 min sessions per week for five weeks) of cognitive training (incongruent Stroop and 2-back tasks), whereas the control group completed no training. In Study 2, the cognitive training group completed nine sessions (three 10 min sessions per week for three weeks) of cognitive training (incongruent Stroop, stop-signal and typing inhibition tasks), whereas the control group completed nine sessions of sham training (congruent Stroop, sham stop-signal and sham typing inhibition tasks). Endurance exercise performance was measured as force production (Study 1) and time to exhaustion (Study 2). Heart rate, exertion and fatigue were also measured. Results: Endurance performance, indexed by force production (Study 1) and time to exhaustion (Study 2), did not change from pre-test to post-test and did not differ between cognitive training and control groups. Similarly, ratings of perceived exertion and heart rate during the exercise tasks did not differ between cognitive training and control groups (Studies 1 and 2). Conclusions: Since separate cognitive training did not improve exercise endurance performance, combined training should be used to create a synergistic training stimulus for brain adaptation and performance enhancement.

Many adults worldwide do not meet current physical activity (PA) guidelines. Mental fatigue decreases the likelihood of choosing to engage in PA. Message framing may enhance PA motivation when fatigued. We examined the effects of mental fatigue and message framing on PA motivation with additional focus on the messaging “congruency effect.” Three hundred and twenty undergraduates completed measures of dispositional motivational orientation and were exposed to either gain-framed or loss-framed messages before completing an effort discounting questionnaire. Results showed lower motivation to engage in PA of higher intensities and longer durations. Direct effects of message framing on PA motivation were not significant. Interaction effects revealed that participants receiving messages congruent with their dominant motivational orientation showed increased motivation for light-intensity PA and decreased motivation for vigorous-intensity PA as mental fatigue increased. Findings suggest that providing messages congruent with one’s dominant motivational orientation may increase motivation for engaging in light-intensity PA when fatigued.

Objectives To map the context of sedentary behaviour in older adults who are prefrail and frail during the winter and spring over 3 days (2 weekdays and 1 weekend) and to determine if certain types of sedentary behaviours are associated with health outcomes. Design Mixed methods, prospective longitudinal cohort study. Setting Community-dwelling older adults living in southern Ontario, Canada. Participants We recruited 21 older adults (72±7.3 years, 13 females, 13 frail) and experienced two dropouts. Results Participants accumulated a total of 18.4±2.6 hours/day of sedentary time in winter and 17.7±3.1 hours/day in spring. When considering daily indoor sedentary time (excluding sleep), participants accumulated 7.6±4.0 hours/day in winter and 6.3±2.7 hours/day in spring. In the spring, 68% of participants accumulated 60 min, the types of behaviours, time of day and season. Trial registration number NCT05661058.

The adoption and maintenance of physical activity (PA) is an important health behavior. This paper presents the first comprehensive empirical test of the Physical Activity Adoption and Maintenance (PAAM) model, which proposes that a combination of explicit (e.g., intention) and implicit (e.g., habit,, affect) self-regulatory processes is involved in PA adoption and maintenance. Data were collected via online questionnaires in English, German, and Italian at two measurement points four weeks apart. The study included 422 participants (M_age= 25.3, SD_age= 10.1; 74.2% women) from Germany, Switzerland, Italy, Canada, and the U.S. The study results largely supported the assumptions of the PAAM model, indicating that intentions and habits significantly mediate the effects of past PA on future PA. In addition, the effect of past PA on future PA was shown to be significant through a mediation chain involving affect and habit. Although the hypothesis that trait self-regulation moderates the intention-behavior relationship was not supported, a significant moderating effect of affect on the same relationship was observed. The results suggest that interventions targeting both explicit and implicit processes may be effective in promoting PA adoption and maintenance.