Position-based assessment of head impact frequency, severity, type, and location in high school American football.

Introduction: Research on head impact characteristics, especially position-specific investigations in football, has predominantly focused on collegiate and professional levels, leaving a gap in understanding the risks faced by high school players. Therefore, this study aimed to investigate the effect of three factors-player position, impact location, and impact type-on the frequency, severity, and characteristics of impacts in high school American football. Additionally, we examined whether and how player position influences the distribution of impact locations and types.

Coronagraph-based wavefront sensors for the high Strehl regime.

A crucial component of the high-contrast instrumental chain in astronomy is the wavefront sensor (WFS). A key property of this component is its sensitivities, which reflect its ability to efficiently use incoming photons to encode the phase aberrations. This paper introduces a new class of highly sensitive wavefront sensors that approach the fundamental sensitivity limits dictated by physics.

Design and maintenance of medical oxygen concentrators in Sub-Saharan Africa: a systematic review.

Background: Oxygen therapy is critical and vital treatment for hypoxemia and respiratory distress, however, access to reliable oxygen systems remains limited in SSA. Despite WHO initiatives that distributed over 30,000 OC oxygen concentrators worldwide, SSA faces significant challenges related to their maintenance and use, due to harsh environmental conditions, technical skill shortages and inadequate infrastructure. This review aims to systematically identify and assess the literature on OC design adaptations, maintenance challenges, and knowledge gaps in SSA, providing actionable recommendations to inform innovative and context-sensitive solutions to improve healthcare delivery in the region.

Two- and Three-Dimensional Culture Systems: Respiratory In Vitro Tissue Models for Chemical Screening and Risk-Based Decision Making.

Risk of lung damage from inhaled chemicals or substances has long been assessed using animal models. However, New Approach Methodologies (NAMs) that replace, reduce, and/or refine the use of animals in safety testing such as 2D and 3D cultures are increasingly being used to understand human-relevant toxicity responses and for the assessment of hazard identification. Here we review 2D and 3D lung models in terms of their application for inhalation toxicity assessment.

Voices of Frontline Leaders: Challenges and Opportunities from Frontline Primary Care Clinic Leaders in a Safety-Net Health Care System.

Background: Burnout, disengagement, and turnover among clinicians is a major challenge for the US health care industry. Research has shown that higher direct supervisor leadership scores correlate with decreased provider burnout and increased professional fulfillment. Safety-net health systems such as Federally Qualified Health Centers (FQHCs) face increased challenges due to limited financial resources, more complex social determinants of health among patients, and often fewer physician leaders who can serve as mentors compared to large, integrated health systems.