Students' perspectives on racism and anti-racism in physical education: a systematic review.

Sports, with their various social manifestations, exhibit racist structures and incidents. Physical education (PE) has the potential to serve as an environment to combat racism, but it can also perpetuate and (re)produce racist attitudes and behaviors. This study aimed to conduct a systematic review of national (German) and international literature concerning racism and anti-racism within the context of PE specifically from a students' perspective. The research methodology followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) standard and encompassed a four-step process: (1) searching 11 electronic databases using 70 keyword combinations in both German and English; (2) selecting studies based on five predetermined inclusion criteria; (3) evaluating the quality of selected studies using established appraisal tools; and (4) conducting descriptive and template analyses. Of 5,213 publications, 16 met the inclusion criteria, demonstrating diverse theoretical frameworks and methodological approaches. Five themes were constructed: "How racism is understood" (1); "What students experience," encompassing discriminatory incidents in PE, sports, and daily life classified as racial stereotypes, prejudices, and everyday racism (2); and "What physical education teachers (3)/Institutions (4)/researchers (5) can and should do." These themes provided recommendations for teachers, institutions, and researchers, including training and curriculum reforms. While valuable international literature was identified, no German PE specific publications were found emphasizing the necessity of a local (German) survey to comprehend students' experiences, knowledge, and potential for anti-racism efforts. Such insights are crucial for shaping teacher-related training programs and policy demands in an informed and targeted manner.

The impact of accredited social health activists in India on uptake of modern contraception: A nationally representative multilevel modelling study.

The government of India introduced the Accredited Social Health Activist (ASHA) programme in 2006 to connect marginalised communities to the health system. ASHAs are mandated to increase the uptake of modern contraception through the doorstep provision of services. There is currently no evidence on the impact of ASHAs on the uptake of contraception at the national level. This paper examines the impact of ASHAs on the uptake of modern contraception using nationally representative National and Family Health Survey data collected in 2019-21 in India. A multilevel logistic regression analysis was performed to determine the effect of contact with ASHAs on the uptake of modern contraception, controlling for regional variability and socio-demographic variables. The data provide strong evidence that ASHAs have succeeded in increasing modern contraceptive use. Women exposed to ASHAs had twice the odds of being current users of modern contraception compared to those with no contact, even after controlling for household and individual characteristics. However, only 28.1% of women nationally reported recent contact with ASHA workers. The ASHA programme should remain central to the strategy of the government of India and should be strengthened to achieve universal access to modern contraception and meet sustainable development goals by 2030.

Analyzing the Impact of Family Structure Changes on Children's Stress Levels Using a Stress Biomarker.

Changes in family structure (e.g., parental separation or stepfamily formation) are associated with a deterioration in children's well-being. Most researchers have focused on the impact of such changes on children's educational and psychosocial outcomes, whereas the effects on children's biological processes have been studied less often. We analyze the effects of changes in family structure on children's stress levels using data from the German Health Interview and Examination Survey for Children and Adolescents study (2003-2006 and 2014-2017). Our outcome variable is the biomarker c-reactive protein (CRP), which correlates with psychological distress and is collected from blood samples. Calculating first-difference estimators, we analyze whether children have higher CRP levels after changing to (1) single-parent families (n = 117) or (2) stepfamilies (n = 80). Our findings suggest that changing to a single-parent family significantly increases children's stress, whereas changing to a stepfamily does not. These observations are important because increased stress in childhood can negatively affect well-being later in life.

Erratum: Collapse of Coherent Large Scale Flow in Strongly Turbulent Liquid Metal Convection [Phys. Rev. Lett. 128, 164501 (2022)].

This corrects the article DOI: 10.1103/PhysRevLett.128.164501.

In-Bulk Temperature Profile Mapping Using Fiber Bragg Grating in Fluids.

The capabilities of Fiber Bragg Grating (FBG) sensors to measure temperature variations in the bulk of liquid flows were considered. In the first step of our research project, reported in this paper, we investigated to what extent the use of thin glass fibers without encapsulation, which only minimally disturb a flow, can fulfill the requirements for robustness and measurement accuracy. Experimental tests were performed in a benchmark setup containing 24 FBG measuring positions, which were instrumented in parallel with thermocouples for validation. We suggest a special assembly procedure in which the fiber is placed under a defined tension to improve its stiffness and immobility for certain flow conditions. This approach uses a single FBG sensor as a reference that measures the strain effect in real time, allowing accurate relative temperature measurements to be made at the other FBG sensor points, taking into account an appropriate correction term. Absolute temperature readings can be obtained by installing another well-calibrated, strain-independent thermometer on the reference FBG. We demonstrated this method in two test cases: (i) a temperature gradient with stable density stratification in the liquid metal GaInSn and (ii) the heating of a water column using a local heat source. In these measurements, we succeeded in recording both spatial and temporal changes in the linear temperature distribution along the fiber. We present the corresponding results from the tests and, against this background, we discuss the capabilities and limitations of this measurement technique with respect to the detection of temperature fields in liquid flows.

Population health differences in cross-border regions within the European Union and Schengen area: a protocol for a scoping review.

INTRODUCTION: Along with European integration and the harmonisation of living conditions, improvements in health have been observed over the past decades. However, sociospatial inequalities within and across member states still exist today. While drivers of these health inequalities have been widely researched on a national and regional scale, cross-border regions remain understudied. The removal of border controls within the European Union (EU) member states has facilitated economic convergence and created new opportunities, including cross-border cooperation in the healthcare systems. However, whether and how these developments have influenced the population health in the respective cross-border regions is unclear. Hence, this scoping review aims to examine the empirical literature on the changes in health outcomes over time at the population level in EU cross-border areas. Additionally, we aim to identify the type of evidence and available data sources in those studies. Finally, we will determine the research gaps in the literature. METHODS AND ANALYSIS: We will follow the Joanna Briggs Institute methodology for this scoping review. The 'Population-Concept-Context' framework will be used to identify the eligibility criteria. A three-step search strategy will be conducted to find relevant studies in the databases of PubMed, Web of Science, Scopus and EBSCOhost (SocIndex). Additionally, we will search on websites of international governmental institutions for further reports and articles. The finalisation of the search is planned for August 2023. The extracted data from the scoping review will be presented in a tabular form. A narrative summary of the selected studies will accompany the tabulated results and describe how they answer the research questions. ETHICS AND DISSEMINATION: We will exclusively use secondary data from available studies for our analysis. Therefore, this review does not require ethical approval. We aim to publish our findings at (inter-)national conferences and as an open-access, peer-reviewed journal article.

Physiological and cognitive responses to hyperoxic exercise in full water submersion.

The positive effects of combined hyperoxia and physical exercise on physiological parameters and cognitive functioning are established for normobaric laboratory contexts. Still, increased practicability exists in hyperbaric settings like underwater activities and SCUBA diving, where environmental and sport-specific factors might moderate effects. Improved cognition, reduced ventilation (V̇E), and lower blood lactate concentrations [Lac-] are highly relevant, especially during high-stress and rescue scenarios. Fifteen participants performed 3 × 8 min of continuous underwater fin-swimming at 25 % (low), 45 % (moderate), and 75 % (vigorous) heart rate reserve (HRR) in each test. Three separate test days differed solely by the inspiratory oxygen partial pressure (PIO2: 29 kPa, 56 kPa, and 140 kPa). V̇E was measured continuously, whereas breathing gas analysis, blood sampling, and Eriksen Flanker tasks for inhibitory control (100 stimuli) were performed post-exercise. Two-way ANOVAs with repeated measures on the factors PIO2 and exercise intensity analyzed physiological outcome variables and reactions times (RT) and accuracy (ACC) of inhibitory control. V̇E was significantly reduced for 140 kPa during moderate and vigorous and for 56 kPa during vigorous compared to 29 kPa. 56 kPa and 140 kPa showed no differences. [Lac-], post-exercise V̇CO2, and velocity were unaffected by PIO2. Faster RTs but lower ACC of inhibitory control were observed following exercise at 75 % HRR compared to rest, 25 %, and 45 % HRR, while PIO2 produced no effects. Underwater performance in hyperoxia presents reduced V̇E, possible by dampened chemoreceptor sensitivity, and effects on cognition that differ from laboratory results and emphasise the moderating role of sport-specific factors.

Hyperoxia-induced reductions in V̇_E with 56 and 140 kPa P_IO₂ during constant submaximal fin-swimming intensity compared to air might be prominently caused by peripheral chemoreceptor suppression.No difference between 56 and 140 kPa was detected, indicating a P_IO₂ threshold limiting further hyperoxic influence on V̇_E. O₂ supply might sufficiently cover metabolic demands of submaximal exercise with 56 kPa, while further reductions in V̇_E could be observed only by severely higher P_IO₂.Cognitive performance by inhibitory control was unaffected by P_IO₂. Faster RTs but lower ACC were observed following vigorous exercise (75 % HRR) compared to rest, low, and moderate exercise.

District-Level Mortality Convergence in Reunified Germany: Long-Term Trends and Contextual Determinants.

The mortality gap between former East and West Germany decreased rapidly in the decade following the reunification of the country in 1990. However, because no previous study has estimated life expectancy (e0) over time for all German districts, the extent of mortality convergence across districts and its determinants are largely unknown. We used a novel relational Bayesian model to estimate district e0 in Germany during 1997-2016, examined mortality convergence using a novel convergence groups approach, and explored the role of selected district characteristics in the process. Differences in e0 between German districts decreased for both sexes during 1997-2016, mainly driven by rapid mortality improvements in eastern German districts. However, considerable heterogeneity in district-level e0 trajectories within federal states was evident. For example, district clusters in northwestern Germany showed increasing e0 disadvantage, which led to a north-south divergence in mortality. A multinomial regression analysis showed a robust association between the e0 trajectory and the district-level tax base and long-term unemployment but not with hospital density. Thus, an equitable "leveling up" of health seems possible with policies investing in places and the people who inhabit them.

Exercise-Related Effects on Executive Functions During a Simulated Underwater Extravehicular Activity.

OBJECTIVE: Investigation of cognitive performance during extravehicular activities (EVAs) in a space-analog setting. BACKGROUND: EVAs performed by humans in microgravity on the International Space Station (ISS) call for high cognitive performance during upper-body workload. Higher cardiovascular demands interact with cognitive performance, but no knowledge exists about EVA's special requirements. This study simulates EVA-training underwater to investigate its effects on the executive functions inhibition and switching. METHOD: In a counterbalanced crossover design, 16 divers (age: 28 ± 2.4 years; eight females) performed two conditions (i.e., EVA vs. Inactivity [INACT]) in 3-5 m submersion (diving gear; not in a space-suit). EVA included 30 min of moderate-, followed by 30 min of high-intensity upper-body exercise intervals, paired with EVA-specific cognitive-motor tasks. INACT included no exercise in submersion and neutral buoyancy. Both conditions included cognitive testing at pre, mid (after the first 30 min), and post (after the second 30 min) on a tablet computer. Reaction times (RTs) and response accuracy (ACC) were calculated for both tasks. RESULTS: ACC was significantly lower during EVA compared with INACT for inhibition (post: p = .009) and switching (mid: p = .019) at post (p = .005). RTs for inhibition were significantly faster during EVA (p = .022; ηp2 = 0.320). CONCLUSION: Specific physical exercise, intensity, duration, and tasks performed during the EVA might differently affect the exercise-cognition interaction and need further investigation, especially for future long-term space travel. APPLICATION: Future research might serve to improve mission success and safety for EVAs and long-term space travel.

Biomechanical analysis of distance adjustment in volleyball overhead pass.

In volleyball, the overhead pass is important. Coaches usually teach players to push the ball, utilising the legs, especially for a long distance pass. The purpose of this study was to conduct a biomechanical analysis of an overhead pass to different distances. Twelve male elite volleyball players participated. They were told to pass a ball with an overhead pass through a 2.43 m high ring located 3 m, 6 m, and 9 m in front of them. Twenty-four reflective markers were placed on the ball and the subject's body to obtain joint centres, joint angles, and ball position. EMG activities were recorded from four right arm muscles. Triceps brachii and flexor carpi radialis pull and push phase activities differed significantly between 3 m and 6 m, but not between 6 m and 9 m. On the other hand, leg movements were significantly different among 3 m, 6 m, and 9 m, suggesting that leg movements supplement the power given to the ball. Thus, as the distance to a target lengthens in an overhead pass, not only arm movement but also leg movement is required.

Early-life exposure to economic stress and metabolic risks in young adulthood: the children of the reunification in East Germany.

BACKGROUND: Research on the long-term health consequences of early-life exposure to economic crises is scarce. We examine for the first time the long-term effects of early-life exposure to an economic crisis on metabolic health risks. We study objective health measures, and exploit the quasi-experimental situation of the postreunification economic crisis in East Germany. METHODS: Data were drawn from two waves of the longitudinal German Health Interview and Examination Survey for Children and Adolescents (2003-2006, 2014-2017). We compared 392 East Germans who were exposed to the economic crisis in utero and at ages 0-5 with 1123 of their West German counterparts using propensity score matching on individual and family characteristics. We assessed blood pressure, cholesterol, blood fat and body mass index (BMI); both combined as above-average metabolic health risks and individually at ages 19-30. RESULTS: Early-life exposure to the economic crisis significantly increased the number of above-average metabolic health risks in young adulthood by 0.1482 (95% CI 0.0169 to 0.2796), which was 5.8% higher compared with no exposure. Among individuals exposed in utero, only females showed significant effects. Early-life exposure to the economic crisis was associated with increased systolic (0.9969, 95% CI -0.2806 to 2.2743) and diastolic blood pressure (0.6786, 95% CI -0.0802 to 1.4373), and with increased BMI (0.0245, 95% CI -0.6516 to 0.7001). CONCLUSION: The increased metabolic health risks found for women exposed to the postreunification economic crisis in-utero are likely attributable to increased economic stress. While the observed differences are small, they may foreshadow the emergence of greater health disparities in older age.

Collapse of Coherent Large Scale Flow in Strongly Turbulent Liquid Metal Convection.

The large-scale flow structure and the turbulent transfer of heat and momentum are directly measured in highly turbulent liquid metal convection experiments for Rayleigh numbers varied between 4×10^{5} and ≤5×10^{9} and Prandtl numbers of 0.025≤Pr≤0.033. Our measurements are performed in two cylindrical samples of aspect ratios Γ=diameter/height=0.5 and 1 filled with the eutectic alloy GaInSn. The reconstruction of the three-dimensional flow pattern by 17 ultrasound Doppler velocimetry sensors detecting the velocity profiles along their beam lines in different planes reveals a clear breakdown of coherence of the large-scale circulation for Γ=0.5. As a consequence, the scaling laws for heat and momentum transfer inherit a dependence on the aspect ratio. We show that this breakdown of coherence is accompanied with a reduction of the Reynolds number Re. The scaling exponent ß of the power law Nu∝Ra^{ß} crosses eventually over from ß=0.221 to 0.124 when the liquid metal flow at Γ=0.5 reaches Ra≳2×10^{8} and the coherent large-scale flow is completely collapsed.

The progression of the tobacco epidemic in India on the national and regional level, 1998-2016.

BACKGROUND: Evidence regarding the progression of the tobacco epidemic remains fragmented in low- and middle-income countries. In India, most of the studies that examined tobacco consumption focused on one time point, on the country as a whole, and on men. Despite important gender differences in tobacco consumption, vast economic and cultural differences exist within India. We, therefore, assessed the progression of the tobacco epidemic in India on both the national and the regional level, by gender. METHODS: We use information on current tobacco use among Indians aged 15-49 from three rounds of the National Family Health Survey (NFHS) (1998-99, 2005-06, 2015-16) to estimate the age-standardized sex specific smoking and smokeless tobacco prevalence across India and its states. RESULTS: Age-standardized tobacco use prevalence in India increased between 1998-1999 and 2005-2006, and declined from 2005-2006 to 2015-2016, simultaneously for men and women. There are substantial spatial differences in the progression of the tobacco epidemic in India. While tobacco use declined in the majority of states, we observe high and increasing use for men in the north-eastern states of Manipur, Mizoram and Nagaland, and for women in the western state of Gujarat and north-eastern state of Manipur. We observed even more states with a recent increasing prevalence in either tobacco smoking or smokeless tobacco. Throughout, prevalence of tobacco use has been higher among men than women for all Indian regions, and remained higher than the national average in the north-eastern states. CONCLUSIONS: Our results suggest that India and the majority of its states experienced a 'compressed tobacco epidemic' in which the prevalence of tobacco consumption increased and decreased simultaneously for women and men over a comparatively short period of time. Despite the overall progress India made in reducing tobacco use, further lowering tobacco consumption remains a public health priority, as the prevalence of smoking and/or smokeless tobacco use remains high in a number of states. We therefore conclude that tobacco regulations should be expanded with the aim of reducing the overall health burden associated with tobacco consumption across India.

Sports-Related Motor Processing at Different Rates of Force Development.

How does our brain manage to process vast quantities of sensory information that define movement performance? By extracting the required movement parameters for which brain dynamics are, inter alia, assumed to be functionally related to, we used electroencephalography to investigate motor-related brain oscillations. Visually guided movement (i.e., motor) tasks at explosive, medium and slow rates of force development (RFD) revealed increased broad-band activity at explosive RFD, whereas decreasing activity could be observed during both intermediate and slow RFD. Moreover, a continuously decreasing activity pattern from faster to slower RFD and a return to baseline activity after full muscle relaxation was found. We suggest oscillatory activity to desynchronize in sensorimotor demanding tasks, whereas task-specific synchronization mirrors movement acceleration. The pre/post-stimulus activity steady state may indicate an inhibitory baseline that provides attentional focus and timing.

The Short-Term Effects of European Integration on Mortality Convergence: A Case Study of European Union's 2004 Enlargement.

Although European integration can be expected to result in mortality convergence (reduced mortality differences), a life expectancy divide persists in the European Union (EU) between the old Member States (OMS) in the west and the new Member States (NMS) in the east. Studies investigating the impact of European integration on mortality convergence are rare and did not consider regional differences. We examine the short-term effects of the 2004 enlargement on mortality convergence at the supranational, national, and subnational levels. Using sex-specific life expectancies for 23 Member States (1990-2017) and the NUTS 2 regions in Czechia, Hungary, and Poland for 1992-2016, we examined the trend in sigma and beta mortality convergence measures at the country and regional levels using joinpoint regression. We found no compelling evidence that EU accession influenced the process of mortality convergence between OMS and NMS, or within the three NMS, over the short term. While there was overall beta and sigma convergence at the national level during 1990-2017, no regional convergence showed, and the trends in convergence did not significantly change at the time of EU accession or soon after (2004-2007). The accession in 2004 did not visibly impact the overall process of mortality convergence over the short term, likely because of the greater influence of country and region-specific policies and characteristics. The interaction of Member State and regional contexts with the mechanisms of European integration requires further study. Future enlargement procedures should emphasise tailored support to ensure more equitable gains from European integration. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s10680-021-09596-y.

The Influence of Environmental Constraints in 360° Videos on Decision Making in Soccer.

Decision making is an important prerequisite of soccer expertise. Beyond expertise, considering the effects of environmental constraints on decision-making processes could help specify existing theories. To address this gap, expert and nonexpert soccer players were enrolled to test how environmental constraints affect decision-making processes. Environmental constraints were experimentally manipulated: Opponent pressure was implemented by presenting a close opponent player in soccer scenes, time constraint was implemented by providing short time intervals for making the decision, and first-person perspective was implemented by using 360° videos. The experts outperformed the nonexperts, and the results showed significant main effects of time constraint and opponent pressure, but not perspective. The players' option and decision quality improved under the time constraint but were negatively affected by opponent pressure. The negative effects of opponent pressure were especially true under limited time and in third-person perspective. The results, alternative manipulations, and implications of environmental effects are discussed for decision-making research.

Difference in racket head trajectory and muscle activity between the standard volley and the drop volley in tennis.

Among tennis coaches and players, the standard volley and drop volley are considered basically similar, but muscles need to be relaxed (deactivation) just at the moment of impact when hitting the drop volley. However, this is not evidence-based. The aim of this study was to clarify racket head trajectory and muscle activity during the drop volley and to compare them with those of the standard volley. We hypothesized that 1) the racket head would move less forward for the drop volley than for the standard volley and 2) the wrist and elbow muscles be relaxed for the drop volley at the time of ball impact. Eleven male college students with sufficient tennis experience volunteered to participate in this study. Wireless EMG sensors recorded activation of the four arm muscles. Each subject performed the standard volley or the drop volley with both a forehand and a backhand from a position near the net. Four high speed video cameras (300 Hz) were set up on the court to measure ball speed and racket head trajectory. Returned ball speed of the drop volley was significantly lower than that of the standard volley (p < 0.05). The racket head moved less forward than in the standard volley, supporting the first hypothesis. Muscle activity of the drop volley, just before and after ball impact for both the forehand and backhand, was lower than that of the standard volley. However, the activity was in the form of a gradual increase as impact time approached, rather than a sudden deactivation (relaxation), which did not support the second hypothesis. For the drop volley, lower muscle activity in the forearm enabled a softer grip and thus allowed a "flip" movement of the racket to diminish the speed of the returned ball.

Income support programmes for the older adults in South Asia: a scoping review protocol.

INTRODUCTION: South Asian countries are ageing and experiencing a rapid increase in proportion of the older population. Income support programmes are of central importance for the older adults as they may help to mitigate the poverty risks associated with ageing and losing the ability to generate income from labour. Evidence related to the income support programmes can help in understanding whether the programmes have been impactful. This scoping review will map the evidence (and gaps) related to income support programmes and create a base to identify the feasibility of future primary research and/or the scope of systematic reviews in the areas where evidence is available. METHODS AND ANALYSIS: The Joanna Briggs Institute scoping review methodology will be followed. Eligibility criteria for the scoping review will be based on the 'PCC' or the 'Population-Concept-Context' concept. Advanced search for the relevant articles will be conducted in MEDLINE (via PubMed), Embase, Scopus, Campbell Collaboration, 3ie International Initiative for Impact Evaluation and Web of Science. Additional resources search will be conducted in important organisational websites. Findings of the scoping review will be summarised using descriptive information (frequencies and percentages) for the available evidence on concept (ie, income support programmes), population characteristics and other study variables. ETHICS AND DISSEMINATION: The review is based on data from available literature, hence an ethical approval is not necessary. With this review, we attempt to provide recommendations to the research community and the policymakers about the currently available evidence and the research required for income support of older adults in South Asia, so that resources can be directed towards addressing the same. We plan to disseminate the findings through presentation in international conference and publication in a peer-reviewed journal. REVIEW REGISTRATION: Not registered.

Martial arts training is related to implicit intermanual transfer of visuomotor adaptation.

Recent work identified an explicit and implicit transfer of sensorimotor adaptation with one limb to the other, untrained limb. Here, we pursue the idea that different individual factors contribute differently to the amount of explicit and implicit intermanual transfer. In particular, we tested a group of judo athletes who show enhanced right-hemispheric involvement in motor control and a group of equally trained athletes. After adaptation to a 60° visual rotation, we estimated awareness of the perturbation and transfer to the untrained, non-dominant left hand in two experiments. We measured the total amount of intermanual transfer (explicit plus implicit) by telling the participants to repeat what was learned during adaptation, and the amount of implicit transfer by instructing the participants to refrain from using what was learned and to perform movements as during baseline instead. We found no difference between the total intermanual transfer of judokas and running experts, with mean absolute transfer values of 42.4° and 47.0°. Implicit intermanual transfer was very limited, but larger in judokas than in general sports athletes, with mean values of 5.2° and 1.6°. A multiple linear regression analysis further revealed that total intermanual transfer, which mainly represents the explicit transfer, is related to awareness of the perturbation, while implicit intermanual transfer can be predicted by judo training, amount of total training, speed of adaptation, and handedness scores. The findings suggest that neuronal mechanisms such as hemispheric interactions and functional specialization underlying intermanual transfer of motor learning may be applied according to individual predisposition.

Intergenerational resource sharing and mortality in a global perspective.

Resource sharing has always been a central component of human sociality. Children require heavy investments in human capital; during working years, help is needed due to illness, disability, or bad luck. While hunter-gatherer elders assisted their descendants, more recently, elderly withdraw from work and require assistance as well. Willingness to share has been critically important for our past evolutionary success and our present daily lives. Here, we document a strong linear relationship between the public and private sharing generosity of a society and the average length of life of its members. Our findings from 34 countries on six continents suggest that survival is higher in societies that provide more support and care for one another. We suggest that this support reduces mortality by meeting urgent material needs, but also that sharing generosity may reflect the strength of social connectedness, which itself benefits human health and wellbeing and indirectly raises survival.