Environmental Stress Hypothesis Research Articles

Increased aridity is associated with stronger tradeoffs in ponderosa pine vital functions.

Trees must allocate resources to core functions like growth, defense, and reproduction. These allocation patterns have profound effects on forest health, yet little is known about how core functions trade off over time, and even less is known about how a changing climate will impact tradeoffs. We conducted a 21-year survey of growth, defense, and reproduction in 80 ponderosa pine individuals spanning eight populations across environmental gradients along the Colorado Front Range, USA. We used linear mixed models to describe tradeoffs among these functions and to characterize variability among and within individuals over time. Growth and defense were lower in years of high cone production, and local drought conditions amplified year-to-year tradeoffs between reproduction and growth, where trees located at sites with hotter and drier climates showed stronger tradeoffs between reproduction and growth. Our results support the environmental stress hypothesis of masting, which predicts that greater interannual variation in tree functions will be associated with more marginal environments, such as those that are prone to drought. With warming temperatures and increased exposure to drought stress, trees will be faced with stronger interannual tradeoffs, which could lead to further decreases in growth and defensive efforts, ultimately increasing risks of mortality.

Self-esteem, self-efficacy, and social support mediate the relationship between motor proficiency and internalizing problems in adults: Exploring the environmental stress hypothesis in adulthood

The Environmental Stress Hypothesis (ESH) is a theoretical model used to understand the factors mediating the relationship between motor proficiency and internalizing problems. The aim of this study is to explore a potential extension of the ESH by examining whether BMI, physical activity levels, self-esteem, self-efficacy and social support are potential mediators between motor proficiency and internalizing problems in young adults. 290 adults aged between 18 and 30 years old (150 women, 140 men) were evaluated with the following instruments: Adult Developmental Coordination Disorders Checklist (ADC), Depression, Anxiety and Stress Scale (DASS 21), Social Support Satisfaction Scale (SSSS), Perceived General Self-Efficacy Scale (GSE), Rosenberg Self-Esteem Scale (RSES), International Physical Activity Questionnaire (IPAQ), and self-reported body mass index (BMI). The results indicated that self-esteem, self-efficacy, and social support mediate the relationship between motor proficiency and internalizing problems in this sample. Thus, the findings reinforce the notion that early intervention and preventive psychological care can serve as protective aspects of mental health in adults at risk for low motor proficiency.

S06-4 Exploring correlates of adolescent boys' muscular fitness: a mixed-methods formative study

Abstract Background According to the Elaborated Environmental Stress Hypothesis, anxiety and depression in children are associated with poor motor competence, and these associations may be mediated by social support and self-perceptions. Improving children’s motor competence through school-based physical activity interventions may therefore be a mechanism for promoting positive mental health through psychosocial factors. Co-production provides opportunities to participate in intervention development processes, thereby ensuring that specific needs of stakeholders are targeted. The shared stakeholder ownership of the process provides a context-sensitive basis for acceptable interventions with increased likelihood of them being effectively implemented and resulting in positive outcomes. This presentation describes phase 1 of the Move Well, Feel Good study, which aimed to co-produce and evaluate the feasibility of a primary school physical activity intervention to improve children’s motor competence and mental health. Methods Five primary schools were recruited from a low socioeconomic status community in northwest England. From these schools, stakeholder groups were formed consisting of class teachers, school leaders, physical activity specialists, and children (aged 8-9 years). Stakeholders worked in single and multiple stakeholder groups through a 6-stage process aligned to the Double Diamond Design Approach by employing divergent and convergent thinking processes to discover, define, develop, and deliver a solution to the ‘problems’ of how best to improve children’s motor competence and mental health, and how best to facilitate real-world school context implementation of the intervention. Through this process the child and adult stakeholders worked separately in workshops and engaged in additional learning and consensus activities. The adult stakeholder co-production workshops were informed by the children’s views and current research evidence. Multiple-stakeholder groups worked collaboratively to develop intervention ideas, which were presented, critiqued, and refined in alignment with the TIDieR checklist. Results In the final stage of the process the research team presented the final co-produced interventions back to the stakeholders and a consensus vote was taken to decide which intervention would be implemented in the phase 2 feasibility trial in September 2022. Conclusions School stakeholders’ participation in intervention co-production ensures their ownership of the finalised programme, which may be important for subsequent implementation and engagement.

Externalizing problems mediate the relationship between motor proficiency and internalizing problems in children: An extension of the Environmental Stress Hypothesis.

The Environmental Stress Hypothesis (ESH) is a causal theoretical framework that provides a flexible context for understanding factors that mediate the relationship between low motor proficiency and internalizing problems in children. The purpose of the present study was to use the ESH framework to determine whether body mass index (BMI), physical activity levels, psychosocial health and physical health, self-efficacy, perceived social status, prosocial behavior and externalizing problems were potential mediators between motor proficiency and internalizing factors in a population of Brazilian children. 431 children aged 7- to 10 years (240 females, 191 males) participated in the study. The variables were measured with the Movement Assessment Battery for Children, 2nd ed. (MABC-2), the Pediatric Quality of Life Inventory (PedsQL), the Strengths and Difficulties Questionnaire (SDQ), the MacArthur Subjective Social Status Scale (MacArthur SSS), the Self-efficacy Sense Assessment Roadmap (RASAE), and the Physical Activity Questionnaire (PAQ). The results indicated a direct relationship between motor proficiency and internalizing problems in a population of Brazilian children, with externalizing problems being the only variable mediating that relationship. To the best of our knowledge, this is the first time that externalizing problems were tested in the context of the ESH. Understanding and evaluating potential mediators in the relationship between motor proficiency and internalizing problems using the ESH framework is essential to promote prevention policies and interventions for school-age children.

Does physical activity and BMI mediate the association between DCD and internalizing problems in early childhood? A partial test of the Environmental Stress Hypothesis.

Young children with Developmental Coordination Disorder (DCD) are more likely to experience internalizing problems, such as depression and anxiety, than typically developing (TD) children. Currently, the underlying mechanisms resulting in increased internalizing problems in DCD remains unknown; however, a previous study based on the Environmental Stress Hypothesis (ESH) indicated that physical inactivity and obesity may mediate the relationship between DCD and internalizing problems. The purpose of this study is to investigate the relationships among DCD, internalizing problems, physical activity, and BMI, and the role of sex in these relationships in preschool children, a population for which we currently have very limited data. Young children between the ages of 4 and 5years enrolled in the Coordination and Activity Tracking in CHildren (CATCH) study comprised the sample (n=589). Of these, 288 (193 boys, 67.0%) were classified as at risk for DCD (rDCD), based on scoring at or below 16th percentile on the Movement Assessment Battery for Children - Second Edition. Physical activity was measured using accelerometers and height and weight were measured by trained research assistants, while parents completed the Child Behavior Checklist to rate internalizing problems. The mediating effects of physical activity and BMI were tested on the relationship between rDCD and internalizing problems. Children with rDCD reported more internalizing problems than TD children. While there was a direct effect of rDCD on internalizing problems, neither physical activity nor BMI were found to mediate this relationship. The findings from this study support co-occurring internalizing problems in preschool children with DCD, and extend these findings to demonstrate that this relationship is not explained by physical activity or BMI in early childhood. Further research should be directed toward other psychosocial factors identified in the ESH to better understand the underlying mechanisms between DCD and co-occurring internalizing problems.

Diversity of Gall-Inducing Insects Associated With a Widely Distributed Tropical Tree Species: Testing the Environmental Stress Hypothesis.

Abiotic factors can affect plant performance and cause stress, which in turn affects plant-herbivore interactions. The Environmental Stress Hypothesis (ESH) predicts that gall-inducing insect diversity will be greater on host plants that grow in stressful habitats. We tested this hypothesis, considering both historical and ecological scales, using the plant Copaifera langsdorffii Desf. (Fabaceae) as a model because it has a wide geographic distribution and is a super-host of gall-inducing insects. According to the ESH, we predicted that 1) on a historical scale, the diversity of gall-inducing insects will be higher in habitats with greater environmental stress and 2) on an ecological scale, gall-inducing insect diversity will be greater on plants that possess greater levels of foliar sclerophylly. We sampled gall-inducing insects on plants of C. langsdorffii in five sites with different levels of water and soil nutrient availability and separated from each other by a distance of up to 470 km. The composition, richness, and abundance of gall-inducing insects varied among study sites. Plants located in more stressful habitats had higher levels of foliar sclerophylly; but richness and abundance of gall-inducing insects were not affected by host plant sclerophylly. Habitat stress was a good predictor of gall-inducing insect diversity on a regional scale, thus corroborating the first prediction of the ESH. No relationship was found between plant sclerophylly and gall-inducing insect diversity within habitats. Therefore, on a local scale, we did not find support for our second prediction related to the ESH.

Poor Motor Performance - Do Peers Matter? Examining the Role of Peer Relations in the Context of the Environmental Stress Hypothesis.

The aim of the current study was to investigate pathways of the Environmental Stress Hypothesis concerning the role of peer relations in the context of poor motor skills. First, we examined (1) the mediating role of peer problems in the association between motor performance in daily activities and internalizing problems as a main pathway of the Environmental Stress Hypothesis. Furthermore, we explored the role of (2) children’s popularity as a mediator and (3) best friendship quality as a moderator path of the effect of motor performance on both peer problems and internalizing problems. The non-clinical sample of the present study consisted of 189 children (48.6% females) aged 9–11 years (Mage = 9.69, SDage = 0.46). Parents reported on their child’s motor performance in daily activities by completing the Developmental Coordination Disorder Questionnaire. The Strengths and Difficulties Questionnaire was used to assess peer problems as well as internalizing problems. The Self Description Questionnaire provided a measure of children’s self-reported popularity. The Friendship Quality Questionnaire was used to investigate children’s best friendship quality. Results of a structural equation model suggest that peer problems fully mediated the association between the motor performance in daily activities and both popularity and internalizing problems. However, no evidence for the mediating effect of popularity in the association between peer problems and internalizing problems was found. Further, best friendship quality had a non-significant moderating effect on the relation between peer problems and internalizing problems. The mediating role of peer problems highlights the importance of peer relations in the motor performance of daily activities. Schools and psychomotor interventions were suggested as practical implications to support children with poor motor performance in their relationship with their peers and to improve their motor performance in daily activities.

Poor Motor Performance – Do Peers Matter? Examining the Role of Peer Relations in the Context of the Environmental Stress Hypothesis

Poor Motor Performance – Do Peers Matter? Examining the Role of Peer Relations in the Context of the Environmental Stress Hypothesis

Consumer mobility predicts impacts of herbivory across an environmental stress gradient.

Environmental stress impedes predation and herbivory by limiting the ability of animals to search for and consume prey. We tested the contingency of this relationship on consumer traits and specifically hypothesized that herbivore mobility relative to the return time of limiting environmental stress would predict consumer effects. We examined how wave-induced water motion affects marine communities via herbivory by highly mobile (fish) vs. slow-moving (pencil urchin) consumers at two wave-sheltered and two wave-exposed rocky subtidal locations in the Galapagos Islands. The exposed locations experienced 99th percentile flow speeds that were 2-5 times greater than sheltered locations, with mean flow speeds>33cm/s vs.<16cm/s, 2-7 times higher standing macroalgal cover and 2-3 times lower cover of crustose coralline algae than the sheltered locations. As predicted by the environmental stress hypothesis (ESH), there was a negative relationship between mean flow speed and urchin abundance and herbivory rates on Ulva spp. algal feeding assays. In contrast, the biomass of surgeonfishes (Acanthuridae) and parrotfishes (Labridae: Scarinae) was positively correlated with mean flow speed. Ulva assays were consumed at equal rates by fish at exposed and sheltered locations, indicating continued herbivory even when flow speeds surpassed maximum reported swimming speeds at a rate of 1-2 times per minute. Modeled variation in fish species richness revealed minimal effects of diversity on herbivory rates at flow speeds<40cm/s, when all species were capable of foraging, and above 120cm/s, when no species could forage, while increasing diversity maximized herbivory rates at flow speeds of 40-120cm/s. Two-month herbivore exclusion experiments during warm and cool seasons revealed that macroalgal biomass was positively correlated with flow speed. Fish limited macroalgal development by 65-91% at one exposed location but not the second and by 70% at the two sheltered locations. In contrast, pencil urchins did not affect algal communities at either exposed location, but reduced macroalgae by 87% relative to controls at both sheltered locations. We propose an extension of the ESH that is contingent upon mobility to explain species-specific changes in feeding rates and consumer effects on benthic communities across environmental gradients.

Untangling multiple species richness hypothesis globally using remote sensing habitat indices

Abstract Remotely sensed data can estimate terrestrial productivity more consistently and comprehensively across large areas than field observations. However, questions remain how species richness and abundances are related to terrestrial productivity in different biogeographic realms. The Dynamic Habitat Indices (DHIs) are a set of three remote sensing indices each related to a key biodiversity productivity hypothesis (i.e., available energy proxied by the annual cumulative productivity, environmental stress proxied by the minimum productivity throughout the year, and environmental stability proxied by the annual coefficient of variation in productivity). Here, we quantify the relevance of each hypothesis globally and for different biogeographic realms using models of species richness for three taxa (amphibians, birds, and mammals) derived from IUCN species range maps. Using parameterized generalized additive models (GAM’s) we found that the available energy hypothesis was the best individual index explain 37–43% of the variation in species richness globally with the best models for amphibians and worst for mammal richness. Examining the residuals of these GAMS indicated that adding the environmental stress hypothesis explained 0–22% additional variance, especially in the Nearctic where large amounts of snow and ice are prevalent and environmental conditions deteriorate during winter. The addition of the environmental stability hypothesis generally explained more variance than the environmental stress hypothesis, especially in the Neartic and Paleartic and for birds however, in certain cases, the environmental stress hypothesis explains more variance at the realm scale.

The Dynamic Habitat Indices (DHIs) from MODIS and global biodiversity

Remotely sensed data can help to identify both suitable habitat for individual species, and environmental conditions that foster species richness, which is important when predicting how biodiversity will respond to global change. The question is how to summarize remotely sensed data so that they are most relevant for biodiversity analyses, and the Dynamic Habitat Indices are three metrics designed for this. Our goals here were to a) derive, for the first time, the Dynamic Habitat Indices (DHIs) globally, and b) use these to evaluate three hypotheses (available energy, environmental stress, and environmental stability) that attempt to explain global variation in species richness of amphibians, birds, and mammals. The three DHIs summarize three key measures of vegetative productivity: a) annual cumulative productivity, which we used to evaluate the available energy hypothesis that more energy is associate with higher species richness; b) minimum productivity throughout the year, which we used to evaluate the environmental stress hypothesis that higher minima cause higher species richness, and c) seasonality, expressed as the annual coefficient of variation in productivity, which we used to evaluate the environmental stability hypothesis that less intra-annual variability causes higher species richness. We calculated the DHIs globally at 1-km resolution from MODIS vegetation products (NDVI, EVI, LAI, fPAR, and GPP), based on the median of the good observations of all years from the entire MODIS record for each of the 23 or 46 possible dates (8- vs. 16-day composites) during the year, and calculated species richness for three taxa (amphibians, birds, and mammals) at 110-km resolution from species range maps from the IUCN Red List. We found marked global patterns of the DHIs, and strong support for all three hypotheses. The three DHIs for a given vegetation product were well correlated (Spearman rank correlations ranging from −0.6 (cumulative vs. variation DHIs) to −0.93 (variation vs. minimum DHI)). Similarly, DHI components derived from different MODIS vegetation products were well correlated (0.8–0.9), and correlations of the DHIs with temperature and precipitation were moderate and strong respectively. All three DHIs were well correlated with species richness, showing in ranked order positive correlations for cumulative DHI based on GPP (Spearman rank correlations of 0.75, 0.63, and 0.67 for amphibians, resident birds, and mammals respectively) and minimum DHI (0.73, 0.83, and 0.62), and negative for variation DHI (−0.69, −0.83, and −0.59). Multiple linear models of all three DHIs explained 67%, 65%, and 61% of the variability in species richness of amphibians, resident birds, and mammals, respectively. The DHIs, which are closely related to well-established ecological hypotheses of biodiversity, can predict species richness well, and are promising for application in biodiversity science and conservation.

Moderating Effects of Physical Activity and Global Self-Worth on Internalizing Problems in School-Aged Children With Developmental Coordination Disorder.

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 < 0.05). Furthermore, the moderated moderating effect (three-way interaction) of physical activity and global self-worth was also evident (p < 0.05), 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.

The Relationship Between Motor Skills, Psychosocial Adjustment and Peer Victimization in School-Aged Children

The aim of this study was to investigate the relationships between childrens’ motor competence, psychosocial adjustment, peer victimization, physical activity participation and obesity. Using the Elaborated Environmental Stress Hypothesis as the framework, we hypothesized that multiple stressors influence children with poor motor competence and that the pathway from motor competence to psychosocial maladjustment is more complex than initially thought. A sample of child-parent dyads (n = 51; children ages 7 to 10 years), were recruited from two educational institutions in Sudbury, Ontario. Child participants completed self-report measures on peer victimization, depression symptoms, loneliness and anxiety symptoms across five dimensions (social phobia, obsessive-compulsive disorder, separation anxiety, panic disorder and generalized anxiety). Child participants also completed the Test of Gross Motor Development-3. Parent participants completed a sociodemographic questionnaire and a questionnaire on their child’s levels of participation in physical activity. For boys, Pearson product-moment correlations revealed that lower motor competence was significantly related to depressive symptoms, social phobia, separation anxiety symptoms, loneliness and peer victimization. For girls, lower motor competence was significantly related to separation anxiety symptoms and loneliness. No correlations were found between motor competence, weight status and physical activity participation. Findings are consistent with previous literature. These findings suggest that (1) boys are more psychosocially affected and victimized than girls when measured against motor competence and, (2) children are experiencing these issues as early as age 7, which is a time when children are starting to build social relationships. More research is required strengthen these findings.

Motor skills and internalizing problems throughout development: An integrative research review and update of the environmental stress hypothesis research

BackgroundThe Environmental Stress Hypothesis provides a conceptual framework detailing the complex relationship between poor motor skills and internalizing problems. AimsThis integrative research aimed to synthesize studies that have evaluated complex pathways posited in the framework. MethodThis study followed the four stages of an integrative research review: (i) problem formation and research aims, (ii) literature search and data collection, (iii) data evaluation and analysis, and (iv) results and discussion. Outcomes and ResultsTwelve peer-reviewed, English language studies published within 2010–2018 were identified. These used mostly cross-sectional, correlational methods and provided varying levels of support for relationships posited in the framework in samples spanning early childhood to adulthood. Compared to intrapersonal factors (e.g., self-esteem/ perceived competence), interpersonal factors (e.g., social support, peer problems) were found to more strongly and consistently mediate the relationship between motor skills and internalizing problems. Conclusions and ImplicationsThere is growing empirical support for many of the Environmental Stress Hypothesis pathways. However, research to date is limited in the ability to establish causal relationships between variables, which is integral to the Environmental Stress Hypothesis. Intervention studies provide a useful type of experimental research that could establish causality between variables, while working to improve the physical and psychosocial functioning of people with poor motor skills.

Motor coordination problems and psychological distress in young adults: A test of the Environmental Stress Hypothesis

Background and aimsThe Environmental Stress Hypothesis (ESH) has been used to examine how the relationship between poor motor coordination and psychological distress is affected by physical health and psychosocial factors. However, work applying the ESH is still limited, and no studies have used this framework with adults. The current investigation aims to examine the association between motor coordination and psychological distress among emerging adults, and examine potential mediators to this relationship based on the ESH. Methods225 young adults aged 17–23 years completed a survey of motor coordination, physical activity, secondary stressors (i.e., general stress and global relationships), perceived social support, self-concept, and psychological distress. Structural equation modeling was conducted to examine mediating pathways and overall model fit. ResultsThe final model of the ESH showed good model fit (x2 = 83.24, p < .01; RMSEA=0.056; NNFI = 0.927; CFI = 0.954; GFI = 0.947), and indicated that the relationship between poor motor coordination and psychological distress was mediated by secondary stressors, perceived social support, and self-concept. ConclusionsThis study highlights the effect of poor motor coordination on psychological distress in young adults, and suggests that interventions should target psychosocial well-being, in addition to motor coordination, to prevent psychological distress.

The relationship between motor skills, perceived self‐competence, peer problems and internalizing problems in a community sample of children

AbstractPoor motor skills have been associated with a range of interpersonal and intrapersonal difficulties, including poor self‐competence, peer problems, and internalizing problems such as anxiety and depression. The Elaborated Environmental Stress Hypothesis provides a theoretical framework for understating these relationships. Studies have recently begun to evaluate this framework; however, ongoing empirical investigation is required. Currently, the extent to which these relationships may differ across factors such as gender remains unclear. The current study tests an indirect effect of motor skills on internalizing problems via peer problems and perceived self‐competence in a community sample of 164 children (81 males; 83 females) aged 7 to 12 years. A combination of clinician‐administered, self‐report, and parent‐rated measures were used. Regression analysis using PROCESS indicated that the relationship between motor skills and internalizing problems was not moderated by gender. Motor skills did have an indirect effect on internalizing problems via perceived scholastic competence and peer problems. Results provide partial support for part of the Elaborated Environmental Stress Hypothesis; perceived scholastic competence and peer problems are mechanisms through which motor skills are related to internalizing problems in school‐aged children. This study highlights potentially important targets for psychomotor interventions for this age group.Highlights The Environmental Stress Hypothesis suggests that motor skills may have an indirect effect on internalizing problems via factors such as peer problems and perceived self-competence. A community sample of 164 children aged 7–12 years provided measures of motor skills and psychosocial functioning. Motor skills had an indirect effect on internalizing problems via perceived scholastic competence and peer problems. This relationship was not moderated by gender.

A test of the Environmental Stress Hypothesis in children with and without Developmental Coordination Disorder

ObjectivesThis study examined several underlying mechanisms hypothesized by the Environmental Stress Hypothesis (ESH) to explain the association between probable Developmental Coordination Disorder (pDCD) and internalizing problems. Design/MethodA cross-sectional analysis involving 1206 children aged 12–14 years (79 pDCD, 6.6% of the sample) was conducted. Children received assessments of motor coordination, physical activity, BMI, global self-worth, and internalizing problems. Path analysis was conducted to examine overall model fit and sex differences. ResultsThe results showed significant sex differences in the underlying pathways connecting pDCD to internalizing problems, indicating more mediating pathways through physical activity, BMI and global self-worth in girls, compared to boys. ConclusionsOverall, we were able to find support for some of the pathways identified in the ESH in school-aged children. Results also suggest that the development of interventions may need to be sex specific.

The relationship between motor skills and psychosocial factors in young children: A test of the elaborated environmental stress hypothesis.

The elaborated environmental stress hypothesis (EESH) provides a framework that describes how motor skills may indirectly cause internalizing problems through various mediating psychosocial factors. While there is evidence to support this framework, little is known about how the proposed relationships may vary across different stages of development. This study aimed to investigate whether peer problems and perceived self-competence mediated the relationship between motor skills and internalizing problems in pre-primary children, and at 18-month follow up. A community sample of 197 pre-primary school children (M=5.40years, SD=0.30years; 102 males, 95 females) participated at Time 1, with 107 completing the Time 2 follow-up. Standardized instruments were used to measure motor skills and verbal IQ. Perceived self-competence was measured using a self-report measure. Participant peer problems and internalizing problems were measured using teacher report. Age, gender, and verbal IQ were included as covariates. Mediation analysis using PROCESS showed that the relationship between motor skills and internalizing problems was mediated by peer problems at Time 1. At Time 2, the relationship was mediated by peer problems and perceived physical competence. The current results indicate the EESH may function differently across different periods of development. The transition from pre-primary to Grade 1 represents a time of important cognitive and psychosocial development, which has implications for how the relationship between motor skills and internalizing problems can be understood. These findings highlight potential age-appropriate targets for psychomotor interventions aiming to improve the emotional well-being of young children.

Elaboration of the Environmental Stress Hypothesis-Results from a Population-Based 6-Year Follow-Up.

The aim of this paper was to contribute to the elaboration of the Environmental Stress Hypothesis framework by testing eight hypotheses addressing the direct impact of gross motor coordination problems in elementary-school on selected physical, behavioral and psychosocial outcomes in adolescence. Results are based on a longitudinal sample of 940 participants who were (i) recruited as part of a population-based representative survey on health, physical fitness and physical activity in childhood and adolescence, (ii) assessed twice within 6 years, between the ages of 6 and 10 years old as well as between the ages of 12 and 16 years old (Response Rate: 55.9%) and (iii) classified as having gross motor coordination problems (N = 115) or having no gross motor coordination problems (N = 825) at baseline. Motor tests from the Körperkoordinationstest, measures of weight and height, a validated physical activity questionnaire as well as the Strength and Difficulties Questionnaire were conducted. Data were analyzed by use of binary logistic regressions. Results indicated that elementary-school children with gross motor coordination problems show a higher risk of persistent gross motor coordination problems (OR = 7.99, p < 0.001), avoiding organized physical activities (OR = 1.53, p < 0.05), an elevated body mass (OR = 1.78, p < 0.05), bonding with sedentary peers (OR = 1.84, p < 0.01) as well as emotional (OR = 1.73, p < 0.05) and conduct (OR = 1.79, p < 0.05) problems in adolescence in comparison to elementary-school children without gross motor coordination problems. However, elementary-school children with gross motor coordination problems did not show a significantly higher risk of peer problems (OR = 1.35, p = 0.164) or diminished prosocial behavior (OR = 1.90, p = 0.168) in adolescence, respectively in comparison to elementary-school children without gross motor coordination problems. This study is the first to provide population-based longitudinal data ranging from childhood to adolescence in the context of the Environmental Stress Hypothesis which can be considered a substantial methodological progress. In summary, gross motor coordination problems represent a serious issue for a healthy transition from childhood to adolescence which substantiates respective early movement interventions.

The relationship between motor proficiency and mental health outcomes in young adults: A test of the Environmental Stress Hypothesis

Growing evidence has highlighted the importance of motor proficiency in relation to psychosocial outcomes including self-perceived competence in various domains, perceived social support, and emotional areas such as anxiety and depression. The Environmental Stress Hypothesis-elaborated (Cairney, Rigoli, & Piek, 2013) is a proposed theoretical framework for understanding these relationships and recent studies have begun examining parts of this model using child and adolescent populations. However, the extent to which the relationships between these areas exist, persist or change during early adulthood is currently unclear. The current study aimed to investigate the Environmental Stress Hypothesis in a sample of 95 young adults aged 18–30years and examined the mediating role of physical self-worth and perceived social support in the relationship between motor proficiency and internalising symptoms. The McCarron Assessment of Neuromuscular Development (McCarron, 1997) was used to assess motor proficiency, the Depression Anxiety Stress Scale (Lovibond & Lovibond, 1995) provided a measure of internalising symptoms, and the Physical Self Perceptions Profile (Fox & Corbin, 1989) and the Multidimensional Scale of Perceived Social Support (Zimet, Dahlem, Zimet, & Farley, 1988) were used to investigate the possible mediating role of physical self-worth and perceived social support respectively. Potential confounding variables such as age, gender and BMI were also considered in the analysis. Structural Equation Modelling revealed that perceived social support mediated the relationship between motor proficiency and internalising symptoms, whereas, the mediating role of physical self-worth was non-significant. The current results provide support for part of the model pathways as described in the Environmental Stress Hypothesis and suggest an important relationship between motor proficiency and psychosocial outcomes in young adults. Specifically, the results support previous literature regarding the significant role of perceived social support for mental well-being and suggest that an intervention that considers social support may also indirectly influence mental health outcomes in young adults who experience movement difficulties.