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Marianne I. Clark and Holly Thorpe

This article presents a diffractive experiment in thinking about mothers’ engagements with self-tracking technologies as materially and discursively produced phenomena. Inspired by St. Pierre’s claim that any empirical adventure with new materialisms must begin by living with theory, we share our feminist, collaborative journey with Fitbits and Karen Barad’s agential realism to consider what might emerge when we begin thinking and living with concepts such as diffraction, entanglement, and intra-action. Unfolding within the uncertain intersections of theory, method, and data, our diffractive methodology prompted understandings of maternal, moving bodies as entangled agencies in continuous states of becoming and fostered generative feminist relationships that allowed us to embrace new ways of thinking, knowing, and being.

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Marianne I. Clark and Matthew W. Driller

Purpose: Wearable physical activity monitors present new ethical considerations for researchers and research ethics boards. Best practice guidelines are needed for research involving wearable monitors and should consider how these devices may impact participants outside of the research context. This study examines the perceptions of university students who wore activity monitors for research purposes in order to inform such guidelines. Methods: Focus groups were held with university students who wore digital self-tracking devices for a study examining sleep and physical activity. Questions focused on motivations to wear a physical activity monitor for research, understandings of how personal digital data generated by self-tracking devices are used and accessed, and perceptions of privacy. Results: 83% of students trusted the research process and were motivated to contribute to scientific knowledge by wearing a digital tracking device. Most (83%) understood how their data were used and accessed for research purposes, but 79% were less clear on how data might be accessed and used by third parties. 79% of participants also agreed that different data carries different social and personal implications and thus should not be treated the same by researchers. Conclusions: Protocols for research involving wearable monitors should include briefing/debriefing sessions to clarify data privacy, storage, and use issues. Researchers should also consider how wearing these devices might prompt unexpected emotional and other responses and the social implications of use for participants. The concept of privacy requires further exploration in the context of digital data collection using commercial devices.

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John C. Spence, Chris M. Blanchard, Marianne Clark, Ronald C. Plotnikoff, Kate E. Storey, and Linda McCargar


The purposes of this study were to determine if a) gender moderated the relationship between self-efficacy and physical activity (PA) among youth in Alberta, Canada, and, alternatively b) if self-efficacy mediated the relationship between gender and PA.


A novel web-based tool was used to survey a regionally diverse sample of 4779 students (boys = 2222, girls = 2557) from 117 schools in grades 7 to 10 (mean age = 13.64 yrs.). Among other variables, students were asked about their PA and self-efficacy for participating in PA.


Based upon a series of multilevel analyses, self-efficacy was found to be a significantly stronger correlate of PA for girls. But, boys had significantly higher self-efficacy compared with girls, which resulted in significantly more PA.


Findings suggest self-efficacy is an important correlate of PA among adolescent girls but that boys are more physically active because they have more self-efficacy for PA.

Open access

Lowri C. Edwards, Richard Tyler, Dylan Blain, Anna Bryant, Neil Canham, Lauren Carter-Davies, Cain Clark, Tim Evans, Ceri Greenall, Julie Hobday, Anwen Jones, Marianne Mannello, Emily Marchant, Maggie Miller, Graham Moore, Kelly Morgan, Sarah Nicholls, Chris Roberts, Michael Sheldrick, Karen Thompson, Nalda Wainwright, Malcolm Ward, Simon Williams, and Gareth Stratton