Cognitively engaging physical activity has been suggested to have superior effects on cognition compared to PA with low cognitive demands; however, there have been few studies directly comparing these different types of activities. The aim of this study is to compare the cognitive effects of a combined physically and cognitively engaging bout of PA to a physical or cognitive activity alone in children. Children were randomized in pairs to one of three 20-min conditions: a cognitive sedentary activity; a non-cognitively engaging (...) PA; and a cognitively engaging PA. Executive function was assessed using a modified Eriksen flanker task immediately before and 10–15 min following the experimental condition. Children ages 6–8 years were included in the study. A repeated measures ANOVA found no significant difference between groups with respect to scores on the flanker task. The results do not support the hypotheses that a cognitively engaging bout of PA enhances cognitive performance over non-cognitively engaging PA or sedentary activities. Possible explanations for our findings include overexertion during the acute bout of PA and depletion of positive affect prior to performing the post-intervention EF tasks. (shrink)

ObjectiveTo determine the effects of learning interventions aimed at optimizing the quality of physical education on psychomotor, cognitive, affective and social learning outcomes in children and adolescents.DesignA systematic review and meta-analysis.Data SourcesAfter searching PsycInfo, ERIC, and SportDiscus electronic databases, we identified 135 eligible studies published between January 1, 1995 to May 1, 2021.Eligibility Criteria for Selecting StudiesWe included randomized controlled trials, quasi-experimental studies, and controlled trials that assessed the effect of a PE-based intervention against one of the four identified learning (...) domains in youth at school.ResultsOne hundred and thirty five studies with over 42,500 participants and 193 calculated effect sizes were included in the study. The mean effect across all the learning and development outcomes was small to medium. When adjusted for publication bias using the Duval and Tweedie Trim and Fill Method, this mean effect size increased to d = 0.40. Effect sizes varied significantly based on learning and development outcomes. Interventions that consistently report above or below the mean d = 0.40 effect are identified based on learning outcome. The greatest effects across interventions were witnessed in psychomotor learning outcomes followed by affective, social, and cognitive learning outcomes. A minority of PE interventions captured by this systematic review and meta-analysis reported having a negative effect on student learning and development.ConclusionThe interventions with the greatest effects on student learning and development were dependant on the learning domains. Some PE interventions with a pedagogical focus such as games-based approaches, TARGET/Mastery Teaching, and Sport Education were found to be strong investments across multiple domains. The evidence is limited however by consistency in intervention dosage, study design, and data collection instruments. The study received no internal or external funding and was not prospectively registered. (shrink)

Emerging research shows a strong connection between brain areas governing cognition and motor behavior. Yet, research investigating the negative aftereffects of cognitive control exertion on task performance has not considered the potential role of areas governing motor behavior. The present study investigated the effects of high cognitive control exertion on task self-efficacy and exercise performance in children. A secondary purpose was to investigate whether motor coordination influences the change in exercise performance differently following low versus high cognitive control exertion. Participants (...) (N = 70) performed two isometric handgrip endurance trials separated by a Stroop task, which was either congruent (low cognitive control) or incongruent (high cognitive control). Motor coordination was assessed prior to the first endurance trial. Task self-efficacy for performing the second endurance trial was assessed following the Stroop task. Participants in the high cognitive control condition reported lower task self-efficacy and showed a reduction in endurance exercise performance. Task self-efficacy mediated the cognitive control – performance relationship. Participants scoring lower on motor coordination showed the greatest declines in exercise performance following high cognitive control, whereas motor coordination did not affect performance following low cognitive control. The results of this study provide evidence that task self-efficacy and exercise performance are also negatively affected in children following high cognitive control, and interestingly, these effects are exacerbated among those scoring lower in motor coordination. We recommend future research investigate motor coordination as a potential mechanism for the reductions in both cognitive and physical task performance following the prolonged exertion of high cognitive control. (shrink)

School-aged children with Developmental Coordination Disorder (DCD) are at greater risk for physical inactivity, lower global self-worth, and internalizing problems, such as depression and anxiety. Based on the Environmental Stress Hypothesis (ESH), recent research has shown that physical inactivity and lower global self-worth sequentially mediate the relationship between DCD and internalizing problems, suggesting that DCD leads to lower levels of physical activity, which in turn, leads to lower levels of global self-worth, and ultimately, a greater amount of internalizing problems. However, (...) physical activity and global self-worth may also buffer (i.e., moderate) the adverse effect of DCD on internalizing problems. To date, this has yet to be tested. Participants were 1206 children aged 12-14 years (611 boys, 79 with probable DCD (pDCD)). All children received assessments of motor coordination, physical activity, global self-worth, and internalizing problems. Children with pDCD were less physically active, had lower self-worth, and experienced more internalizing problems compared to typically developing (TD) children (p’s <.05). Furthermore, the moderated moderating effect (three-way interaction) of physical activity and global self-worth was also evident (p <.05), indicating that internalizing problems in both TD and pDCD groups decreased with concurrent increases in physical activity and global self-worth. Importantly, when compared to TD children, increases in physical activity and global self-worth were associated with a greater reduction in internalizing problems among children with pDCD. The findings support several pathways in the ESH and highlight that, in addition to improving motor skills, interventions should also target both physical activity and global self-worth to mitigate potential mental health issues for children with motor difficulties. (shrink)

The following is adapted from the testimony, on 6 June 1984, of Dr T. G. Krontiris before the U.S. House Science and Technology Subcommittee on Investigations and Oversight, on the subject of oncogene research. In a previous report (BioEssays, 1, 3), the testimony of Dr C. J. Sherr, describing the molecular biology of oncogene action was given. Here, Krontiris describes the challenges in applying the new5ndings in diagnosis and therapy.

This article presents two of Foucault’s lesser known notions, “justice fonctionnelle" and “stratégie du pourtour”, in order to interrogate the role of legislators in regard to the policing of political dissent. This article contains three parts. First, I present the two lesser known notions referred to above. Then, I provide my understanding of the role of law for Foucault. Finally, in the third part, I explain how a consensual relationship between the police and legislators is established. I present briefly the (...) work of Avrom Sherr and outline the contents of a recent U.S. anti-protest law which gives the police greater powers to redefine the legal nature of public space and to make arrests without having to show criminal intent on the part of protesters. My aim is to further think through the paradox that Foucault mentioned in his lectures on security societies: non-judicial methods used in security processes undermine the primacy of law but also lead to the overproduction of laws. (shrink)