The influence of biological sex and cuff width on muscle swelling,echo intensity,and the fatigue response to blood flow restricted exercise

The purpose was to determine if the muscle swelling, echo intensity, and fatigue responses to blood flow restriction differs based on cuff width (Experiment 1), applied pressure (Experiment 2), and sex. Ultrasound of muscle was taken before and after exercise. In Experiment 1 (n = 96), men swelled more than women and more with a narrow cuff than a wide cuff (0.60 cm vs. 0.52 cm). Expressed as a percentage change, there were no longer differences between cuffs (Narrow: 15% vs. Wide: 14%) or sex (Men: 14% vs. Women: 15%). Echo intensity remained unchanged. Women required more repetitions to reach task failure in sets 2, 3, and 4. In Experiment 2 (n = 87), men swelled more than women (Men: 0.46 cm vs. Women: 0.31 cm). Expressed as a percentage change, there were no differences. Echo intensity decreased in both conditions and to a greater extent with a higher applied pressure. If the acute muscle swelling response is important for initiating long term adaptation, then our results indicate that neither cuff width, sex, nor applied pressure will differentially impact the adaptation observed via this mechanism. Changes in echo intensity were inconsistent and the utility of this measurement may need to be reconsidered.     

The association of bike fitting with injury,comfort, and pain during cycling: An international retrospective survey

Although bike fitting is recommended to help reduce injury risk, little empirical evidence exists to indicate an association between bike fitting and injury incidence. The aim of the study was to determine the effect of bike fitting on self-reported injury, comfort, and pain while cycling from a worldwide survey of cyclists. A total of 849 cyclists completed an online questionnaire between February and October 2016. Questionnaire collected data on respondent demographics, cycling profile, bike fitting, comfort and pain while cycling, and injury history. The main predictor variable was bike fitting (yes, by the respondent, i.e. user bike fitting; yes, by a professional service; or no). Covariates included demographic and cycling profile characteristics. Logistic regression models estimated the odds of injury within the last 12 months, reporting a comfortable body posture while cycling, and not reporting pain while cycling. Odds ratios (OR) with 95% confidence intervals (CI) were reported. User bike fitting was associated with increased odds of reporting a comfortable posture (OR?=?2.28, 95%CI: 1.06, 4.68). User (OR?=?2.35; 95%CI: 1.48, 3.84) and professional bike fitting (OR?=?2.35; 95%CI: 1.42, 3.98) were both associated with increased odds of not reporting pain while cycling. No associations were found between bike fitting and injury within the last 12 months. In conclusion, we found an association between bike fitting and reported comfort and pain while cycling. We recommend integrating bike fitting into cycling maintenance. However, further studies with longer follow-up are necessary to determine the presence of an association between bike fitting and injury.     

Language,ambiguity, and executive functions in adolescents' theory of mind

Executive functions' (EF) role in adolescents' advanced theory of mind (aToM) was examined. In Study 1, adolescents (N = 189 in 2017, M_age = 13.1 years, 55.6% female from racially/ethnically diverse schools) completed the Flexibility and Automaticity of Social Cognition task (FASC), and shifting and inhibition measures. Study 2 (N = 289 in 2018 and 2019, M_age = 15.7 years, 59.9% female, 56.4% Hispanic/Latino) replicated Study 1 in older adolescents using automated scoring of FASC flexibility. Flexibility of social cognition varied based on ambiguity and language use; automaticity of social cognition varied by ambiguity. The role of EF was less conclusive; shifting and inhibition predicted some flexibility and automaticity measures. Ambiguity, language, and EF, particularly shifting, influence aToM into adolescence.     

(Re)beginning and becoming: antiracism and professional development with white practicing teachers

ABSTRACT

This article focuses on an educational foundations-based professional development (PD) curriculum of antiracist conscientization we as two teacher educators designed and implemented with eight white practicing teachers in the Midwestern United States. We first articulate our conception of educational foundations and curriculum theory as a framework for our PD. We briefly review literature on other PD on race in the United States, outline our data sources, and describe the pedagogy and curriculum of RaceWork’s Tripartite Model of race-visible and antiracist praxis. We then highlight, through interview data, the significance of group (relational) accountability and collaborative relationships that supported these teachers’ self-designed antiracist interventions in their own unique school contexts during the 2-year PD experience. An ongoing, relationship-based PD model leading to material antiracist changes and practices points to a need for a broader, more holistic, and contextualized conception of antiracist interventions in U.S. public P12 school contexts, but also one grounded in the notion that in a white supremacist society, we (as race-visible white educators) are always becoming antiracist.     

College Students’ Psychological Needs and Intrinsic Motivation to Learn: An Examination of Self-Determination Theory

Over the last several decades, instructional communication scholars have studied and measured student motivation as an important learning outcome. Unfortunately, this research has lacked theoretical guidance and has treated student motivation as a construct that varies only in quantity, ignoring existing theory that suggests student motivation is best understood as a construct that differs in quality (i.e., intrinsic motivation). To create two new measures that incorporate theoretical explanations of student motivation, three studies (N = 1,067) were undertaken using self-determination theory (SDT) to operationalize students’ intrinsic motivation as a product of basic psychological need satisfaction. In the first two studies, the Student Psychological Needs Scale and the Intrinsic Motivation to Learn Scale were developed and validated. In the third study, parallel mediation analyses supported SDT’s prediction that the fulfillment of students’ psychological needs (i.e., autonomy, competence, relatedness) would mediate the relationship between personalized education practices and intrinsic motivation to learn.