The homicidol effect: investigating murder as a fitness signal

This article extends homicide adaptation theory by investigating signal effects of a murder. In two experiments (N = 299 and N = 161) participants reported their perceptions of a described person. The first study manipulated the information about the person (including or excluding a single sentence stating that the person has committed a murder) and stimulus person/observer sex match (same vs. opposite sex). Results suggest that murder functions as a signal of the described person's fitness that enhances observers' evaluations and inclination to interact with the person. Opposite-sex observers evaluate the murderer's intent more favorably than same-sex observers, but these evaluations of intent produce differential (positive vs. negative) effects between the two groups. The second study replicated the findings and ruled out potential confounds.     

An experimental investigation of physical education teachers’ and coaches’ reactions to weight-based victimization in youth

Objectives

Overweight youth are frequent targets of weight-based victimization during Physical Education (PE) and sports. In addition, previous research indicates that teachers’ perceptions and expectations may influence their likelihood of intervening during victimization, and physical educators may endorse biased perceptions and expectations of overweight youth. Despite this evidence, no research has examined how physical educators respond to weight-based victimization of their students. Thus, the current study examined PE teachers’ and coaches’ responses to different types of victimization involving average weight and overweight students.

Design

This study utilized an experimental design that assessed participants’ reactions to situations of weight-related victimization using hypothetical scenarios accompanied by photographs of youth.

Methods

PE teachers and sport coaches (N = 162) were randomly presented with a scenario and follow-up questions about an average weight or an overweight student. Each participant completed two conditions: one with a male target, and one with a female target.

Results

Participants were more likely to take action when overweight female students were victims of bullying, specifically in situations of verbal and relational victimization. Male participants were less likely to respond to victimization than female participants.

Conclusions

Findings suggest the importance of increasing awareness about weight-based victimization and its consequences, especially among male physical educators. Implications for the psychological, social, and physical development of overweight youth are discussed.     

Motor competence predicts self-esteem during childhood in typical development children

PurposeThe purpose of this study was to study the relationship between motor competence (MC) and self-esteem in children between 7 and 13 years of age.MethodsThis is five years mixed longitudinal study, although only the last two years were included in the analysis. Participants were N = 144 of both sexes (69 girls) divided in 6 cohorts. At baseline the youngest and the oldest cohorts had 4 and 9 years of age respectively. MC was assessed with KTK. Self-esteem and self-worth were assessed with the Portuguese version of Physical Self-Perception Profile for Children and Youth (PSPP-CY). Cross-lagged models were used to find out whether MC predicts self-esteem and self-worth, or the reverse. Linear mixed models were applied.ResultsOverall, only self-esteem was predicted by MC across age. Results show that self-esteem had a significant decrease between 7 and 13 years of age (−0.56) and that MC is positively associated with self-esteem (b = 0.006).ConclusionsMC had a mitigating effect on the decrease of self-esteem. Promoting MC during childhood and adolescence might have a positive effect on children's well-being and mental health and prevent them to dropout from physical activities.     

Developmental associations of actual motor competence and perceived physical competence with health-related fitness in schoolchildren over a four-year follow-up

The developmental associations between actual motor competence (MC), perceived physical competence (PC), and health-related fitness (HRF) in schoolchildren were investigated over a four-year period. Participants were 1147 (girls 582, boys 565) schoolchildren aged between 11 and 13 years (M = 11.27 ± 0.33 years) in the beginning of the study. Data were collected at five time points in 2017–2021. MC was measured with three product-oriented (i.e., outcome of the movement) motor competence skill tests: side-to-side jump, five-leaps, and throw-catch. PC was assessed with the Physical Self-Perception Profile. HRF was assessed with the 20m shuttle run, curl-up, and push-up tests. The random intercept cross-lagged panel model with birth month and sex as covariates, was tested using repeated measures (within level) and PC, MC, and HRF levels (between level). The key findings were: 1) PC, MC, and HRF levels were reciprocally associated over time; 2) repeated measures of HRF at each time point were positively associated with PC and MC one year later; 3) PC decreased, MC increased, and HRF remained stable over time; and 4) MC was more important than PC in explaining the variability in HRF levels and repeated measures. The positive reciprocal associations of MC, PC, and HRF from late childhood to early adolescence found in this study are important as they indicate that to support HRF in schoolchildren, both MC and PC can be promoted through investment in MC exercises.     

Working memory,sustained attention,and physical activity: An intraindividual study

ObjectiveExperimental studies show small to moderate effects of both acute and regular physical activity on executive functions, these being strongly associated with academic performance at school. In order to understand the naturally occurring associations between primary school-aged children’s working memory, self-reported sustained attention, and physical activity, 35 children (M_age = 9.8 years, range = 7.6–11.4 years old) in Years 3–6 of primary school took part in a two-week long intraindividual study.MethodsParticipants wore an accelerometer wristband throughout the study, and carried out a working memory task (digit recall) and completed a sustained attention measure each morning and afternoon, giving 517 time-points nested in 4–10 school-days (M_obs = 15.8 situations, n_obs = 4–18).ResultsUsing multilevel structural equation models (MSEM), we found that working memory was stable across time (within-person b = 0.29) and trait-like (ICCs = 0.58). Across situations, state-working memory was higher later in the calendar week. Acute moderate to vigorous physical activity (MVPA) was not associated with state-working memory, but exertion of a higher level of MVPA than usual the previous day was associated with lower state-working memory the following day. Trait-sustained attention (across the two weeks) predicted higher trait-working memory and older students outperformed younger students.ConclusionsImplications for timing and intensity of students’ physical activity in educational settings is discussed.     

Positive affect moderates inhibitory control and positive affect following a single bout of self-select aerobic exercise

PurposeResearch suggests that individual differences in baseline cognitive performance moderates subsequent cognitive benefits following a single bout of exercise. The present study seeks to evaluate additional moderating mental states – specifically positive affect – on inhibitory control and affect following exercise.MethodsUsing a within- and between-participants pre-post cross-over design, eighty university students (54 females; 21.7 ± 2.7 years old) completed a flanker task and affect measures before and after a single bout of aerobic exercise at a self-selected intensity or studying for class (15-min) on separate days. Groups of high-positive affect (HPA; n = 41) and low-positive affect (LPA; n = 39) were determined based on a median split of positive affect measures prior to the exercise bout.ResultsThe HPA group revealed shorter reaction time (RT) from before to after exercise and rest with no difference observed between exercise and rest. The LPA group revealed shorter RT after exercise compared to before exercise and after rest. For accuracy, the LPA group improved performance during the exercise session compared to the rest session to a level comparable to the HPA group. Lastly, positive affect decreased in the LPA and HPA groups from before to after rest; however, only the LPA group’s positive affect increased from before to after exercise.ConclusionIndividuals with low positive affect experience greater cognitive and positive affect improvements following acute aerobic exercise at a self-select intensity, further supporting intraindividual differences in mental states as a mechanism for subsequent cognitive and affective benefits encompassing healthy behaviors of exercise.     

The role of motivation in the conceptual model of motor development in childhood

The aim of this study was twofold: first, to investigate whether perceived motor competence (PMC) mediates the relation between actual motor competence (AMC) and physical activity (PA) according to the conceptual model of motor development, and second to examine the role of different motivational regulations (i.e., intrinsic, identified, introjected, and external regulation) in the relationship between PMC and PA. A sample of 504 Spanish students (46.2% girls, 8–12 years old) voluntarily participated in this study. In relation to the first aim, structural equation modeling revealed that PMC indeed mediates the association between AMC and PA. In relation to the second aim, positive associations between AMC and PMC (β = 0.32, p < .001), which in turn was positively related to intrinsic and identified regulations (β = 0.46 and β = 0.43 respectively, p < .001), were found. The model showed direct paths from intrinsic and introjected regulation to PA (β = 0.27 and β = 0.22, p < .05) and indirect paths from PMC through intrinsic motivation to PA (β = 0.13, p < .05). This study confirms that intrinsic motivation mediates the association between PMC and PA. Strategies targeting to build and develop children’s AMC and PMC, and fostering children’s intrinsic motivation should be targeted to promote children’s PA engagement and motor development.     

Change in the social context of physical activity across adolescence and its association with moderate-to-vigorous intensity physical activity

We examined whether changes in social context (i.e., frequency with which youth engage in physical activity [PA] alone, with teammates, with friends, with siblings, or with parents/grandparents) is associated with change in moderate-to-vigorous intensity PA (MVPA) across Grades 5–8 and Grades 8–11 (N = 938). Data were self-reported annually. Across Grades 5–8, the frequency of PA in all social contexts declined over time, and changes in the frequency of PA alone, with teammates, with siblings, and in diversity of PA companion types were positively associated with change in MVPA. Across Grades 8–11, the frequency of PA with siblings, friends, and parents/grandparents declined over time, and changes in the frequency of PA alone, with teammates, with friends, with parents/grandparents, and in diversity of PA companion types were positively associated with change in MVPA. PA social contexts vary in how they associate with change in MVPA in youth over time.     

Associations of cardiorespiratory fitness and moderate-to-vigorous physical activity with latent cognitive abilities in older adults

It has been demonstrated that physical activity has a small but positive effect on cognition in old age, which suggests that it may be possible to alter the trajectory of age-related cognitive decline. However, our understanding of which aspects of physical activity that are important for modifying cognition remains incomplete. Adopting an exploratory approach in a sample of 115 healthy older adults (65–75 years), the present cross-sectional study used structural equation modelling to investigate the dissociable associations of physical activity (moderate-to-vigorous activity, derived from 7-day accelerometry) and cardiorespiratory fitness (VO₂ max, derived from maximal treadmill ergometer test) with multiple latent cognitive abilities (working memory, episodic memory, spatial and verbal reasoning). The results showed a significant positive association between fitness and working memory, when physical activity was statistically controlled for, and a positive association of similar point magnitude between physical activity and episodic memory, when fitness was statistically controlled for, although the latter association did not reach statistical significance. The results add to the foundation for a more careful investigation of the dissociable associations of moderate-to-vigorous physical activity and fitness with cognition in old age, and encourages future research to test the hypothesis that cardiorespiratory fitness benefits working memory via general cerebrovascular effects on grey matter volume, whilst moderate-to-vigorous physical activity benefits episodic memory via effects on neuroplastic processes.