Effects of sleep deprivation on cognitive and physical performance in university students

Sleep deprivation is common among university students, and has been associated with poor academic performance and physical dysfunction. However, current literature has a narrow focus in regard to domains tested, this study aimed to investigate the effects of a night of sleep deprivation on cognitive and physical performance in students. A randomized controlled crossover study was carried out with 64 participants [58% male (n = 37); 22 ± 4 years old (mean ± SD)]. Participants were randomized into two conditions: normal sleep or one night sleep deprivation. Sleep deprivation was monitored using an online time-stamped questionnaire at 45 min intervals, completed in the participants’ homes. The outcomes were cognitive: working memory (Simon game© derivative), executive function (Stroop test); and physical: reaction time (ruler drop testing), lung function (spirometry), rate of perceived exertion, heart rate, and blood pressure during submaximal cardiopulmonary exercise testing. Data were analysed using paired two-tailed T tests and MANOVA. Reaction time and systolic blood pressure post-exercise were significantly increased following sleep deprivation (mean ± SD change: reaction time: 0.15 ± 0.04 s, p = 0.003; systolic BP: 6 ± 17 mmHg, p = 0.012). No significant differences were found in other variables. Reaction time and vascular response to exercise were significantly affected by sleep deprivation in university students, whilst other cognitive and cardiopulmonary measures showed no significant changes. These findings indicate that acute sleep deprivation can have an impact on physical but not cognitive ability in young healthy university students. Further research is needed to identify mechanisms of change and the impact of longer term sleep deprivation in this population

From Substantialist to Process Metaphysics – Exploring Shifts in IS Research

Part 2: Doing Process ResearchInternational audienceThis article examines the shifts in Information Systems (IS) research from a positivist to interpretive to sociomaterial paradigm by demonstrating how the shifts reflected the move from substantialist towards process metaphysics. Such metaphysical grounding provides a foundation for deeper understanding of paradigm differences and the struggles when shifts occur. After a brief historical overview of substantialist and process metaphysics and a summary of their key assumptions, the article explores paradigm shifts in IS research and highlights the underlying metaphysical nature of surrounding difficulties and controversies. The article advances the paradigm debate by drawing attention to the metaphysical nature of paradigmatic shifts in IS research and by opening up intellectual space for conceiving and understanding novel research approaches beyond Burrell and Morgan’s model [1]

Making a Difference in ICT Research: Feminist Theorization of Sociomateriality and the Diffraction Methodology

Part 3: Hybrid Agency and the Performativity of TechnologyInternational audienceOver the last decade, sociomateriality appeared as a theme in IS research that has been interrogated with a variety of theoretical lenses. However, researchers have since raised methodological concerns regarding its application. This paper argues that a research methodology cannot be separated from either the theoretical lens that the research adopts or from its overarching purpose. Considering the broad range of theoretical lenses through which sociomateriality could be examined, this paper focuses on Barad’s theory of agential realism [25]. The paper provides a brief history of agential realism to shed light on the reasons behind IS researchers methodological difficulty and offers a diffraction methodology as a possible methodological guide to IS research adopting this lens. Implication for research is discussed