The impact of chronic carbohydrate manipulation on mucosal immunity in elite endurance athletes

Carbohydrate (CHO) availability could alter mucosal immune responses to exercise. This study compared the effect of three dietary approaches to CHO availability on resting and post-exercise s-IgA levels. Elite race walkers (n = 26) adhered to a high CHO diet (HCHO), periodised CHO availability (PCHO) or a low CHO/high fat diet (LCHF) for 3 weeks while completing an intensified training program. HCHO and PCHO groups consumed 8.0–8.5 g.kg^?1 CHO daily, with timing of ingestion manipulated to alter CHO availability around key training sessions. The LCHF diet comprised 80% fat and restricted CHO to < 50 g.day^?1. A race walk test protocol (19 km females, 25 km males) was completed at baseline, after adaptation, and following CHO restoration. On each occasion, saliva samples were obtained pre- and post-exercise to quantify s-IgA levels. Resting s-IgA secretion rate substantially increased ~ two-fold post-intervention in all groups (HCHO: 2.2 ± 2.2, PCHO: 2.8 ± 3.2, LCHF: 1.6 ± 1.6; fold-change± 95% confidence limits), however, no substantial differences between dietary treatments were evident. Post-exercise, substantial 20–130% increases in s-IgA concentration and 43–64% reductions in flow rate occurred in all dietary treatments, with trivial differences evident between groups. It appears that high volume training overrides any effect of manipulating CHO availability on mucosal immunity in elite athletes.     

The validity of the commercially-available,low-cost,wrist-worn Movband accelerometer during treadmill exercise and free-living physical activity

Low-cost physical activity monitors may provide a more accurate measure of physical activity than subjective methods (e.g., self-report) while being less costly than research-grade accelerometers. The present study assessed the validity of a low-cost monitor (Movband 2) to estimate physical activity behavior/intensity. Participants (N = 23, n = 16 female, BMI = 22.9 ± 4.0 kg/m², age = 21.9 ± 1.6 years) completed four, five-minute treadmill stages (2.0, 3.0, 4.0, 5.0 MPH) while wearing both the Movband and the previously-validated Actigraph monitor. Oxygen consumption (VO₂) was recorded during each stage (Laboratory assessment). A subset (n = 15, n = 10 female, BMI = 22.2 ± 3.2 kg/m², age = 21.5 ± 0.8 years) of these participants then wore the two accelerometers for three days (Free-living assessment). During the Laboratory assessment there were strong, significant (r = 0.94, p ≤ 0.001) relationships between Movband and Actigraph counts and VO₂. During Free-living assessment there was also a strong, significant (r = 0.97, p < 0.001) correlation between Movband and Actigraph counts. The low-cost, Movband accelerometer appears to provide a valid assessment of physical activity behavior/intensity.     

Indigenous Australian women and sport: findings and recommendations from a parliamentary inquiry

Researchers have consistently pointed to positive links between sport, physical activity, health and wellbeing amongst marginalized population groups. This paper concentrates on a group about which little is presently known in terms of these links – Indigenous women in Australia. The catalyst for this focus is twofold: demographic data that, while sparse, suggests that this group has very low levels of participation in sport and associated physical activity; and second, a recent parliamentary inquiry into Indigenous sport in which the participation of women featured in several submissions. Both data sets confirm that Indigenous women are significantly underrepresented in the Australian sporting landscape. There is no systematic knowledge about why this is so. The present study contributes to that small body of literature by considering (a) evidence about participation rates of Indigenous women in sport; and (b) the aspirations of sport organizations to attract Indigenous women into their programs.     

The relationships among fundamental motor skills, health-related physical fitness, and body fatness in South Korean adolescents with mental retardation

The purpose of this study was to examine the following: (a) the relationships among the latent constructs of fundamental motor skills (FMS), health-related physical fitness (HRF), and observed body fatness in South Korean adolescents with mental retardation (MR); (b) the indirect effect of fundamental motor skills on body fatness when mediated by health-related fitness; and (c) whether the degree of MR and gender affects these relationships. Students ages 13 to 18 years (287 boys and 134 girls) were recruited for the study. Separate structural equation models were estimated based on gender and the level of disability: mild or moderate MR. Group differences in the model structure were not found, so the data were combined and a single model estimated. The results showed that FMS significantly contributed to HRF (standardized effects beta = .53), p < .01 and indirectly contributed to decreased body fatness mediated by HRF (-.27), p < .01. HRF directly contributed to decreased fatness (-.50), p < .01. The results from this study support the importance of both increased FMS and increased HRF in relation to decreased body fatness.     

The incidence and nature of letter orientation errors in reading disability

Letter orientation confusions (reversals) in the reading and writing of 10-year-old children with and without reading disability were investigated to determine whether reading disability is associated with letter orientation errors and to identify the nature of the errors. In a variety of tasks measuring letter orientation confusions in reception (reversal detection and recognition) and production (controlled writing, copying), individuals with reading disability made more orientation confusions than average readers. Orientation errors were more frequent for reversible than for nonreversible items in tasks involving long-term memory processes. The results did not appear to be related to group differences in attention or speed of motor responding. Possible sources of orientation confusions, including deficient magnocellular system processing, mislabeling, and overreliance on visual strategies, are discussed.     

THE INTERPLAY BETWEEN ADOLESCENTS’ PERCEPTIONS OF TEACHER‐STUDENT RELATIONSHIPS AND THEIR ACADEMIC SELF‐REGULATION: DOES LIKING A SPECIFIC TEACHER MATTER?

Although positive teacher‐student relationships are known to aid students’ academic self‐regulation, the emotional aspects of teacher liking are often neglected within research. The present study used a large sample of seventh‐ and eighth‐grade students (N = 1,088; M_Age =  13.7) in secondary schools in Germany to investigate whether the motivation students gain from specific well‐liked teachers (i.e., that students identify) can moderate the relation between their perception of teacher‐student relationships overall and academic self‐regulation (intrinsic motivation, identified, introjected, and external regulation). By means of latent moderated structural equations, students’ motivation based on liking one specific teacher was found to moderate the association between teacher‐student relationships and intrinsic motivation. The present study makes a contribution to the existing research on teacher‐student relationships and academic self‐regulation by investigating the role of students’ motivation related to the liking of a specific teacher. Results indicate that when early adolescent students can identify a well‐liked teacher, they tend to have higher levels of academic motivation. Hence, students’ motivation based on liking a single teacher compensates for generally low‐quality teacher‐student relationships and their respective impact on students’ intrinsic motivation.     

THE POWER OF SOCIAL AND MOTIVATIONAL RELATIONSHIPS FOR TEST‐ANXIOUS ADOLESCENTS’ ACADEMIC SELF‐REGULATION

Based on cognitive evaluation theory (CET) and organismic integration theory (OIT) – both sub‐theories of self‐determination theory (SDT) – the present study examined whether the academic self‐regulation of youth with test anxiety can be strengthened through social and motivational relationships with peers and teachers. This study employed a large sample (N = 1088; MAge = 13.7) of early adolescents from secondary schools in Brandenburg, Germany. Structural equation modeling (SEM) was used to test the proposed associations. The results revealed a negative association between test anxiety and intrinsic motivation as well as test anxiety and identified regulation, which was fully mediated by teachers as positive motivators. Furthermore, both teachers as positive motivators as well as the teacher‐student relationship were found to be strong predictors of the self‐determined aspects of academic self‐regulation. Additionally, both peers as positive motivators and the student‐student relationship are essential for external self‐regulation.