Reduced ATP turnover during hibernation in relaxed skeletal muscle.

Hibernating brown bears, due to a drastic reduction in metabolic rate, show only moderate muscle wasting. Here, we evaluate if ATPase activity of resting skeletal muscle myosin can contribute to this energy sparing. By analyzing single muscle fibers taken from the same bears, either during hibernation or in summer, we find that fibers from hibernating bears have a mild decline in force production and a significant reduction in ATPase activity.

Assessment of reproductive knowledge among young adults utilizing Amazon mechanical Turk survey.

Background: Reproductive health technology has evolved significantly since the introduction of in vitro fertilization in 1978, enhancing the possibility of conceiving children at later stages in life. Despite these advancements, there remains a critical gap in fertility knowledge among young adults, as demonstrated by recent studies. This gap is compounded by the growing influence of social media on health information, where misinformation can distort public understanding of fertility-related issues.

Perceptions and intentions regarding IQOS among current US adults who use cigarettes and/or electronic nicotine delivery systems.

Introduction: IQOS was sold in the US in 2019-2021 and will likely return in 2024. It is important to anticipate IQOS' market penetration; thus, this study examined US adults' prior awareness and perceptions, intentions to try and reactions to an IQOS reduced-risk exposure statement.

Methods: 61 adults from three US cities were recruited to represent four tobacco use subgroups: current cigarette and never electronic nicotine delivery systems (ENDS) use; current cigarette and discontinued ENDS use; current cigarette and ENDS use; and former cigarette use and switched to ENDS.

Multicomponent body composition of university club sport athletes.

Background: The body composition of National Collegiate Athletic Association (NCAA) athletes is well documented but no such data exist for university club sports athletes. Additionally, the majority of norms for NCAA athletes were created from individual methods requiring assumptions.

Objective: This study used a four-component (4C) model to measure the body composition of university club sports athletes.

Brain volumes, cognitive, and adaptive skills in school-age children with Down syndrome.

Background: Down syndrome (DS) is the most common congenital neurodevelopmental disorder, present in about 1 in every 700 live births. Despite its prevalence, literature exploring the neurobiology underlying DS and how this neurobiology is related to behavior is limited. This study fills this gap by examining cortical volumes and behavioral correlates in school-age children with DS.