Economic trust in young children.

Mutually beneficial interactions often require trust that others will reciprocate. Such interpersonal trust is foundational to evolutionarily unique aspects of human social behaviour, such as economic exchange. In adults, interpersonal trust is often assessed using the 'trust game', in which a lender invests resources in a trustee who may or may not repay the loan. This game captures two crucial elements of economic exchange: the potential for greater mutual benefits by trusting in others, and the moral hazard that others may betray that trust. While adults across cultures can trust others, little is known about the developmental origins of this crucial cooperative ability. We developed the first version of the trust game for use with young children that addresses these two components of trust. Across three experiments, we demonstrate that 4- and 6-year-olds recognize opportunities to invest in others, sharing more when reciprocation is possible than in a context measuring pure generosity. Yet, children become better with age at investing in trustworthy over untrustworthy partners, indicating that this cooperative skill emerges later in ontogeny. Together, our results indicate that young children can engage in complex economic exchanges involving judgements about interpersonal trust and show increasing sensitivity to appropriate partners over development.

Pay to play: Children's emerging ability to use acts of generosity for selfish ends.

Adults will offer favors to advance their standing and solicit a favor in return, using ostensibly prosocial acts strategically for selfish ends. Here we assessed the developmental emergence of such strategic behaviors in which individuals are generous to elicit future reciprocation from others. In a novel experimental paradigm with children aged 3 to 7 years, we tested whether children are willing to share more valuable resources when this act could prompt subsequent reciprocation. In an Experimental condition, children could share a more attractive or less attractive resource with a person who they knew would subsequently choose to play a game with either the children or another individual. In the Control condition, children knew the person would play alone. Across two studies, we found that over repeated trials, 5- and 7-year-olds, but not 3-year-olds, learned to share more valuable resources in the Experimental condition than in the Control condition. This shows that older age groups were able to quickly learn how to influence the subsequent partner choice in a novel situation. We address theoretical questions about the various types of reciprocity as being supported by different psychological mechanisms and discuss whether the current results could be explained by children's emerging ability for future-directed thinking.

Single-Leg Squat Delicacies-The Position of the Nonstance Limb is an Important Consideration.

Context: The single-leg squat task is often used as a rehabilitative exercise or as a screening tool for the functional movement of the lower limb. Objective: To establish the effect of 3 different positions of the nonstance leg on 3-dimensional kinematics, muscle activity, and center of mass displacement during a single-leg squat. Design: Within-subjects, repeated-measures design. Setting: Movement analysis laboratory. Participants: A total of 10 participants, aged 28.2 (4.42) years performed 3 squats to 60° of knee flexion with the nonstance (1) hip at 90° flexion and knee at 90° flexion, (2) hip at 30° flexion with the knee fully extended, or (3) hip in neutral/0° and the knee flexed to 90°. Main Outcome Measures: Trunk, hip, knee and ankle joint angles, and center of mass displacement were recorded with inertial sensors while muscle activity was captured through wireless electromyography. Results: Most trunk flexion (21.38° [18.43°]) occurred with the nonstance hip at 90° and most flexion of the stance hip (23.10° [6.60°]) occurred with the nonstance hip at 0°. Biceps femoris activity in the 90° squat was 40% more than in the 0° squat, whereas rectus femoris activity in the 0° squat was 29% more than in the 90° squat. Conclusion: The position of the nonstance limb should be standardized when the single-leg squat is used for assessment and be adapted to the aim when used in rehabilitation.

The Functional Movement Screen in the Prediction of Injury in Adolescent Cricket Pace Bowlers: An Observational Study.

CONTEXT: The Functional Movement Screen (FMS) has been found to be a valid preparticipation screening tool in the prediction of injury among various athletes in different sports. The validity thereof in the prediction of injury among adolescent cricketers is yet to be established. OBJECTIVE: To determine if a preseason FMS total score is a valid predictor of in-season injury among adolescent pace bowlers. DESIGN: Prospective observational quantitative study. SETTING: Bowlers performed the FMS before the start of the season. Injury incidence was monitored monthly throughout the season. The student t test and Fisher's exact test were used to compare the FMS scores of the injured and noninjured bowlers as well as the injured and noninjured bowlers who scored ≤ 14. PARTICIPANTS: 27 injury-free, male, adolescent pace bowlers. MAIN OUTCOME MEASURES: The FMS (scoring criteria and score sheet) and standardized self-administered injury questionnaire. RESULTS: There was no difference between the noninjured group (16.55 ± 2.57) and the injured (16.1 ± 2.07) group in terms of FMS scores. There was no significant difference between injured and noninjured bowlers who scored ≤ 14. A total FMS score of 14 does not provide the sensitivity needed to assess injury risk among adolescent pace bowlers and no other accurate cut-off score could be calculated. CONCLUSION: Preseason observed total FMS score is a poor predictor of in-season injury among adolescent pace bowlers. Further research should be conducted to determine if a specific FMS test will be a more valid predictor of injury.

Reward type influences adults' rejections of inequality in a task designed for children.

In the context of economic games, adults sacrifice money to avoid unequal outcomes, showing so-called inequity aversion. Child-friendly adaptations of these games have shown that children, too, show inequity aversion. Moreover, inequity aversion shows a clear developmental trajectory, with young children rejecting only disadvantageously unequal distributions and older children rejecting both disadvantageously and advantageously unequal distributions. However, based on existing work, it is difficult to compare adult and child responses to inequity because (1) adapting economic games to make them child-friendly may importantly alter the dynamics of the fairness interaction and (2) adult work typically uses abstract rewards such as money while work with children typically uses more concrete rewards like candy, stickers or toys. Here we adapted the Inequity Game-a paradigm designed to study children's responses to inequality in isolation from other concerns-to test inequity aversion in adults (N = 104 pairs). We manipulated whether participants made decisions about concrete rewards (candy) or abstract rewards (tokens that could be traded in for money). We found that, like children, adults rejected unequal payoffs in this task. Additionally, we found that reward type mattered: adults rejected disadvantageous-but not advantageous-monetary distributions, yet rejected both disadvantageous and advantageous candy distributions. These findings allow us to draw clearer comparisons across child and adult responses to unfairness and help paint a fuller picture of inequity aversion in humans.

Habit and diabetes self-management in adolescents with type 1 diabetes.

OBJECTIVE: The development of habit (i.e., behavioral automaticity, the extent to which a behavior is performed with decreased thresholds for time, attention [effort], conscious awareness, and goal dependence), for goal-directed health behaviors facilitates health behavior engagement in daily life. However, there is a paucity of research examining automaticity for Type 1 diabetes self-management in adolescence. This study examined if greater perceived automaticity for diabetes self-management was associated with increased daily self-management, decreased daily self-regulation failures in glucose checking, and more optimal daily glycemic levels in adolescents with Type 1 diabetes. METHOD: Adolescents aged 13-17 and diagnosed with Type 1 diabetes (n = 79) completed the Self-Report Behavioral Automaticity Index, a measure of automaticity of diabetes self-management (i.e., automaticity of glucose checking, carbohydrate counting, and insulin dosing), and a measure of perceived self-management at baseline. One to 3 months later, a subsample of teens (n = 42) also completed a daily diary for a 7-day period including perceptions of daily self-management, daily self-regulation failures in glucose checking, and daily glucose levels. RESULTS: Greater overall automaticity of diabetes self-management was associated with greater baseline and daily self-management, fewer daily self-regulation failures in glucose checking, and lower average daily mean blood glucose levels but not more optimal daily variations in blood glucose levels. CONCLUSIONS: Greater automaticity for diabetes self-management may support more optimal daily diabetes self-management in adolescence. Further research is needed to clarify the benefits and mechanisms of automaticity and explore possible interventions. (PsycInfo Database Record (c) 2022 APA, all rights reserved).

Association between physical fitness parameters and risk of in-season injury among adult male rugby players: a systematic review protocol.

OBJECTIVE: The objective of this review is to assess whether pre-season physical fitness parameters are associated with in-season injury risk among adult male rugby players. INTRODUCTION: Pre-season neuromusculoskeletal screening protocols (which include tests related to different physical fitness parameters) are injury prevention strategies employed to manage athletes' in-season injury risk. A systematic review exploring the association between in-season injury and specific physical fitness parameters may justify the inclusion or exclusion of these tests in official screening protocols. INCLUSION CRITERIA: This review will consider prospective, observational cohort studies that investigate injury-free adult (aged 18 years or above) male rugby players, from all levels of participation (recreational, sub-elite and elite). Studies investigating physical fitness parameters and their association to rugby-related neuromusculoskeletal injury will be included. METHODS: The proposed systematic review will be conducted in accordance with the JBI methodology for systematic reviews of etiology and risk. Published and unpublished studies will be sourced from several databases and resources. Two independent researchers will screen, appraise and extract data from studies meeting the inclusion criteria using standardized critical appraisal and data extraction tools. Data synthesis will be conducted and a Summary of Findings constructed to summarize data and draw conclusions. SYSTEMATIC REVIEW REGISTRATION NUMBER: PROSPERO CRD42020130420.

Asymmetrical abdominal muscle morphometry is present in injury free adolescent cricket pace bowlers: A prospective observational study.

OBJECTIVES: This study aimed to determine if abdominal muscle thickness, activation and symmetry are associated with prospective in-season injury among adolescent cricket pace bowlers. DESIGN: A quantitative, prospective, observational study design was used. SETTING: Data was collected at an indoor venue at a secondary school. PARTICIPANTS: 28 injury-free, male, adolescent pace bowlers between the ages of 13 and 18 participated. MAIN OUTCOME MEASURES: Muscle thickness of the transversus abdominis (TA), internal oblique (IO) and external oblique (EO) muscles were measured at rest and during an abdominal drawing-in maneuver (ADIM) i.e. activation, using ultrasound imaging. Incidence of injury was monitored monthly during the cricket season. RESULTS: Thickness of the non-dominant IO at rest was greater than the dominant side for pace bowlers who remained injury free during the cricket season (p = 0.01, effect size (ES) = 0.65). This was, however not the case for bowlers who sustained injuries (p = 0.47; ES = 0.24). TA percentage change during ADIM (activation) on the dominant side was less in bowlers who sustained non-contact injuries compared to those who remained injury free (p = 0.03; ES = 1.17). CONCLUSIONS: Asymmetry in IO thickness may play a protective role against injury, whilst poor TA activation on the dominant side may pose a risk to injury.

University of the Witwatersrand physiotherapy undergraduate curriculum alignment to medical conditions of patients within Gauteng state health facilities.

BACKGROUND: The healthcare sector requires graduates with the ability to confidently assess and manage the majority of the medical conditions seen in hospitals. OBJECTIVE: To establish whether the most prevalent medical conditions treated by physiotherapists in Gauteng (South Africa) state health facilities align with the University of the Witwatersrand (Wits) physiotherapy curriculum. METHODS: This was a retrospective review of condition-related statistics from physiotherapy departments within the Gauteng province state health facilities. Data from all Gauteng government hospitals that had submitted at least 75% of their physiotherapy condition-related statistics to the provincial statistics coordinator from January 2012 to December 2014 were considered and compared to medical conditions covered in the Wits 2015 physiotherapy curriculum to check if all conditions listed in the Gauteng statistics appeared within the Wits curriculum document. The number of teaching hours for the common conditions was noted to check the emphasis given to these conditions in the curriculum. RESULTS: Eighty-three per cent of the hospitals submitted 75% of their monthly statistics. Overall, the most common conditions treated were lower limb fractures (13%) followed by stroke (7.6%) (n = 705 597). Within the neuro-musculoskeletal category, the most common conditions after lower limb fractures were soft tissue injuries (15.1%) (n = 330 511). The most common cardiopulmonary conditions were tuberculosis (24.9%), followed by pneumonia (13.8%) (n = 94 895). The most common neurological conditions were stroke (30.9%) followed by cerebral palsy (17%) (n = 174 024). Within the non-specified categories, the number of intensive care unit (ICU) patients was the highest (23%), followed by sputum induction (21%) (n = 138 187). The most common conditions that were emphasised within the Wits curriculum as indicated by the teaching hours: fractures, 14.5 (66%) of 22 third-year orthopaedics hours; stroke, 30 (73%) of 41 third-year neurology hours; soft tissue injuries, 18 (38%) of 48 fourth-year neuro-musculoskeletal hours; back lesions, 24 (50%) of 48 fourth-year neuro-musculoskeletal hours; and ICU patients, 30 (79%) of 38 fourth-year cardiopulmonary hours. CONCLUSION: The Wits physiotherapy curriculum covers all medical conditions treated by physiotherapists within the Gauteng state health facilities, and overall, the curriculum prepares the students to practise in a variety of situations.

An innovative approach to reducing pain in patients with peripheral neuropathy related to HIV: A single case study.

INTRODUCTION: Peripheral neuropathy (PN) is the most common neurological condition seen in people living with human immunodeficiency virus (HIV) and has been estimated to be present in up to 30% of people with AIDS. Prevalence may be increasing as it appears to be related to the use of antiretroviral therapy in many cases, particularly medication containing stavudine. It is often characterised by burning and numbness in the feet. It can interfere severely with function and sufferers resort to a large number of strategies in an attempt to reduce pain. CASE PRESENTATION: A 50-year-old man presented with severe PN and showed symptoms of extreme weakness and sensitivity of both lower limbs. His symptoms gradually worsened over a period of 18 months to such an extent that he was unable to walk. Medication had no effect on his pain or related symptoms. The authors tested the use of a Vibromat clinical vibrator to treat his PN symptoms. The patient was treated using the same modality for five evenly spaced (monthly) sessions. OUTCOME: The patient showed marked improvement in pain, numbness and pins and needles symptoms after the first session. He was able to walk a short distance with assistance. Treatment was continued and after the third session he was able to walk unaided. Symptom relief was maintained for 4 months. CONCLUSION: This is the first case demonstrating the use of the Vibromat in successfully treating the signs and symptoms of PN. This is important for clinicians who manage patients with HIV-related PN and pain.