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Evaluating an operator physical fitness test prototype for tactical air control party and air liaison officers : a preliminary analysis of test implications
\"The U.S. Air Force asked the RAND Corporation to assist its development and validation of gender-neutral tests and standards for battlefield airmen (BA) specialties. The Air Force has conducted an extensive validation study of occupational relevance of physical fitness tests and standards. Following the fitness test validation study, one enlisted specialty (Tactical Air Control Party [TACP]) and one officer BA specialty (Air Liaison Officer [ALO]) moved forward with an implementation plan to further evaluate a set of recommended tests and continuation standards. This report describes RAND's assistance to the Air Force on two fronts: (1) conducting a preliminary evaluation of potential issues and concerns that might influence implementation effectiveness and (2) developing a framework for evaluating the implementation of occupationally relevant and specific tests and standards. This work provides the foundation for ongoing review and evaluation of Air Force fitness tests and standards, which are designed to ensure that airmen are capable of performing critical physical tasks associated with their assigned specialties\"--RAND website.
Book
On the challenges associated with the study of police use of deadly force in the United States: A response to Schwartz & Jahn
In response to Gabriel Schwartz and Jaquelyn Jahn's descriptive study, \"Mapping fatal police violence across U.S. metropolitan areas: Overall rates and racial/ethnic inequalities, 2013-2017,\" I provide three reflections. First, the framing of this issue is vitally important. Second, police-involved fatalities represent a nonrandom sample of all incidents involving police use of deadly force (i.e., physical force that causes or is likely to cause death), and unfortunately, we lack comprehensive data on use of deadly force that does not result in fatalities. Finally, to make sense of who is killed by the police, researchers must also identify who was exposed to the risk of being killed by the police.
Journal Article
Anatomy of strength & conditioning
Strength training and conditioning, though different in definition and result, are reliant on one another and complement each other. A person who is both strong and well conditioned will be able to sustain physically strenuous activities for a prolonged period of time. Liebman focuses on the skills that, when continually applied and mastered, will help you to achieve your best.
Book
Preparing Law Enforcement Officers to Engage Successfully with Individuals with Autism Spectrum Disorder: An Evaluation of a Performance-Based Approach
Law enforcement officers (LEOs) may use physical force unnecessarily or escalate problem behavior when attempting to gain the compliance of individuals with autism spectrum disorder (ASD) (Copenhaver & Tewksbury in American Journal of Criminal Justice 44:309–333, 2019). Although specialized training may remedy this problem, the relatively small literature on such training programs indicates the need for further research (Railey et al. in Focus on Autism and Other Developmental Disabilities, 2020). This study used simulations with actors to evaluate the outcomes of performance-based instruction on strategies to promote compliance when LEOs respond to calls involving individuals with ASD. Results for three LEOs and 24 police cadets demonstrated the efficacy of behavioral skills training (BST) for teaching LEOs how to interact more effectively with individuals with ASD. Results also suggested that hands-on training should supplement commonly used forms of didactic instruction.
Journal Article
Child-to-Parent Violence: Examining Cumulative Associations with Corporal Punishment and Physical Abuse
Purpose Corporal punishment (CP) and physical abuse (PA) in childhood are associated with increased risk of child-to-parent violence (CPV). Without context of discipline (i.e., the intention of behavior change, and use of reasonable force), both CP and PA represent the use of physical force against a child. It is still unclear if their associations with CPV are similar when they co-occur, or when they occur in isolation. The current study examined the differential and cumulative association of different types of physical force in childhood with rates of CPV.MethodThe sample consisted of 1,132 participants, between 18 to 87-years-old (M = 50.95, SD = 14.24) and included 59.5% female and 39.2% male participants who completed an online survey measuring CP, PA and CPV. Participants formed three groups: low CP or PA (group low), high CP only (group HCP), or high PA and CP (group PA + CP).ResultsTwo one-way ANOVAs with planned contrasts were conducted separately for CPV against mothers and fathers. The group HCP reported significantly higher CPV against both the mother and the father than group low and there was no significant difference between group HCP and group PA + CP.ConclusionsHigher rates of CP are associated with higher rates of CPV; however, this rate does not increase further when there is concurrent PA. This suggests that there may be a low sensitivity for retaliation from a young person, or coercive training (through high parent–child conflict), in environments where there is physical force from a parent.
Journal Article
Cyclic Stretch Promotes Cellular Reprogramming Process through Cytoskeletal‐Nuclear Mechano‐Coupling and Epigenetic Modification
Advancing the technologies for cellular reprogramming with high efficiency has significant impact on regenerative therapy, disease modeling, and drug discovery. Biophysical cues can tune the cell fate, yet the precise role of external physical forces during reprogramming remains elusive. Here the authors show that temporal cyclic‐stretching of fibroblasts significantly enhances the efficiency of induced pluripotent stem cell (iPSC) production. Generated iPSCs are proven to express pluripotency markers and exhibit in vivo functionality. Bulk RNA‐sequencing reveales that cyclic‐stretching enhances biological characteristics required for pluripotency acquisition, including increased cell division and mesenchymal‐epithelial transition. Of note, cyclic‐stretching activates key mechanosensitive molecules (integrins, perinuclear actins, nesprin‐2, and YAP), across the cytoskeletal‐to‐nuclear space. Furthermore, stretch‐mediated cytoskeletal‐nuclear mechano‐coupling leads to altered epigenetic modifications, mainly downregulation in H3K9 methylation, and its global gene occupancy change, as revealed by genome‐wide ChIP‐sequencing and pharmacological inhibition tests. Single cell RNA‐sequencing further identifies subcluster of mechano‐responsive iPSCs and key epigenetic modifier in stretched cells. Collectively, cyclic‐stretching activates iPSC reprogramming through mechanotransduction process and epigenetic changes accompanied by altered occupancy of mechanosensitive genes. This study highlights the strong link between external physical forces with subsequent mechanotransduction process and the epigenetic changes with expression of related genes in cellular reprogramming, holding substantial implications in the field of cell biology, tissue engineering, and regenerative medicine.
Journal Article
The chicken chorioallantoic membrane model in biology, medicine and bioengineering
The chicken chorioallantoic membrane (CAM) is a simple, highly vascularized extraembryonic membrane, which performs multiple functions during embryonic development, including but not restricted to gas exchange. Over the last two decades, interest in the CAM as a robust experimental platform to study blood vessels has been shared by specialists working in bioengineering, development, morphology, biochemistry, transplant biology, cancer research and drug development. The tissue composition and accessibility of the CAM for experimental manipulation, makes it an attractive preclinical in vivo model for drug screening and/or for studies of vascular growth. In this article we provide a detailed review of the use of the CAM to study vascular biology and response of blood vessels to a variety of agonists. We also present distinct cultivation protocols discussing their advantages and limitations and provide a summarized update on the use of the CAM in vascular imaging, drug delivery, pharmacokinetics and toxicology.
Journal Article
Police coercive actions and citizen complaints: a comparison of NYPD precincts
PurposeThis study explores the influence of police coercive actions during Stop, Question, and Frisk (SQF) encounters on citizen complaints of police misconduct in 76 precincts in New York City.Design/methodology/approachUsing data from NYPD's SQF reports, Citizen Complaint Review Board, and demographic measures, the analysis focuses on specific coercive actions (frisk, search, summons, physical force, and arrest) and their association with citizen complaints (excessive force, abuse of authority, discourtesy, and offensive language).FindingsBivariate and multivariate analyses revealed frequent lower-level coercive actions, such as frisks and summons, are linked to increased citizen complaints. Surprisingly, higher levels of coercive actions involving force and arrests do not substantially impact complaints, challenging conventional assumptions.Practical implicationsThe research underscores the importance of transparency, accountability, and positive police-community relations. Addressing precinct-specific characteristics influencing the relationship between coercive actions and citizen complaints is crucial for fostering a more constructive and accountable policing approach in New York City precincts.Originality/valueThis study challenges assumptions by providing a distinctive perspective on the impact of police coercive actions during SQF encounters on citizen complaints. The unexpected finding that higher levels of coercive actions, typically involving force and arrests, do not substantially impact complaints contributes to the discourse on police-community interactions, offering a nuanced understanding of the relationship between specific coercive actions and citizen complaints.
Journal Article
Hydraulic fracture during epithelial stretching
The origin of fracture in epithelial cell sheets subject to stretch is commonly attributed to excess tension in the cells’ cytoskeleton, in the plasma membrane, or in cell–cell contacts. Here, we demonstrate that for a variety of synthetic and physiological hydrogel substrates the formation of epithelial cracks is caused by tissue stretching independently of epithelial tension. We show that the origin of the cracks is hydraulic; they result from a transient pressure build-up in the substrate during stretch and compression manoeuvres. After pressure equilibration, cracks heal readily through actomyosin-dependent mechanisms. The observed phenomenology is captured by the theory of poroelasticity, which predicts the size and healing dynamics of epithelial cracks as a function of the stiffness, geometry and composition of the hydrogel substrate. Our findings demonstrate that epithelial integrity is determined in a tension-independent manner by the coupling between tissue stretching and matrix hydraulics.
Measurements in stretched epithelial cell sheets show that epithelial cracks are independent of tension and that epithelial fracture is caused by the hydraulic pressure that builds up in the extracellular matrix during stretching.
Journal Article
Continuity and change in anger and aggressiveness from infancy to childhood: The protective effects of positive parenting
Early signs of anger and aggression can be identified in infancy. Our aim was to use person-centered methods to identify which infants were most at risk for clinically significant behavioral problems by age 3 and diagnoses of ODD/CD by 7 years, while considering the role of family risk factors and positive parenting. A representative British community sample of 304 infants was assessed by multiple informants at mean ages of 6, 21, and 36 months of age. Latent Transition Analysis (LTA) identified three ordered subgroups at each age, with one subgroup (18%) displaying high levels of physical force as well as anger. These angry aggressive infants were at elevated risk for behavioral problems in early childhood and diagnoses of conduct disorder (CD) and/or oppositional defiant disorder (ODD) at 7 years of age. After other risk factors were taken into account, parents' beliefs in warm parenting and their observed positive affect while interacting with their infants were protective factors. These findings indicate the significance of very early manifestations of angry aggressiveness and have relevance for developmental theories of aggression and prevention strategies.
Journal Article