Single Leg Cycling Offsets Reduced Muscle Oxygenation in Hypoxic Environments.

The intensity of large muscle mass exercise declines at altitude due to reduced oxygen delivery to active muscles. The purpose of this investigation was to determine if the greater limb blood flow during single-leg cycling prevents the reduction in tissue oxygenation observed during traditional double-leg cycling in hypoxic conditions. Ten healthy individuals performed bouts of double and single-leg cycling (4, four-minute stages at 50−80% of their peak oxygen consumption) in hypoxic (15% inspired O2) and normoxic conditions.

Sex-Specific Associations Between Serum Lipids, Antinuclear Antibodies, and Statin Use in National Health and Nutrition Examination Surveys 1999-2004.

Lipid metabolism contributes to the regulation of leukocyte activity and immune responses, and may serve as a therapeutic target in the pathophysiology and clinical management of autoimmune disorders. In addition to lipid-lowering properties, statins have been shown to exert anti-inflammatory and immunomodulatory effects within the context of autoimmunity. Importantly, autoimmune incidence and lipid markers differ between men and women, suggesting that the relationship between lipid metabolism and immune function may vary by sex.

Where Is Garlic Mustard? Understanding the Ecological Context for Invasions of .

The invasive plant Alliaria petiolata (garlic mustard) has spread throughout forest understory and edge communities in much of North America, but its persistence, density, and impacts have varied across sites and time. Surveying the literature since 2008, we evaluated both previously proposed and new mechanisms for garlic mustard's invasion success and note how they interact and vary across ecological contexts. We analyzed how and where garlic mustard has been studied and found a lack of multisite and longitudinal studies, as well as regions that may be under- or overstudied, leading to poor representation for understanding and predicting future invasion dynamics.

Social Communication of Transportation: A Bridge Model Connecting Tourism Destination and Psychological Perception.

As it is essential to explore the influence of social communications on transportation routes in tourism, this article aims to examine the impacts of social communications on transportation routes in the field of tourism and to further explore the relationship between tourism destinations and their psychological perceptions. In terms of links between different tourism destinations in space and time dimensions, our empirical analysis draws the following conclusions: (1) the behavior of tourist flow is a mediating variable on the links between tourist psychological perceptions and tour routes; (2) three modes of point-line interaction are presented in the space and time of tourism destinations; and (3) the scenic city's location, name, and features are important to tourists' psychological perceptions.

Nontraumatic Injuries in the NCAA: Collegiate Football Strength Coaches Should Exercise Caution this Off-Season.

Strength and conditioning coaches were allegedly involved in pre-COVID-19 nontraumatic injuries/deaths (e.g., exertional heat illness, exertional rhabdomyolysis, cardiorespiratory failure) of NCAA (mainly football) student-athletes during off-season training sessions.

Artificial night light and anthropogenic noise interact to influence bird abundance over a continental scale.

The extent of artificial night light and anthropogenic noise (i.e., "light" and "noise") impacts is global and has the capacity to threaten species across diverse ecosystems.

Sensory pollutants alter bird phenology and fitness across a continent.

Expansion of anthropogenic noise and night lighting across our planet is of increasing conservation concern. Despite growing knowledge of physiological and behavioural responses to these stimuli from single-species and local-scale studies, whether these pollutants affect fitness is less clear, as is how and why species vary in their sensitivity to these anthropic stressors. Here we leverage a large citizen science dataset paired with high-resolution noise and light data from across the contiguous United States to assess how these stimuli affect reproductive success in 142 bird species.

Convergent evidence for a theory of rapid, automatic, and accurate sex ratio tracking.

It is presumed that people track the sex ratios in their environment (the number of males relative to number of females) in order to adaptively adjust their decisions and behaviors, but this actual tracking ability has not been established. The relevance of sex ratio information, drawn from evolutionary biology and studies of human relationship decision making, is integrated here with memory research (on frequency encoding), perception research (on ensemble coding), and neuroscience research. A series of four experiments provide empirical results to help fill research gaps and facilitate this theoretical integration.

Gender Dictates the Relationship between Serum Lipids and Leukocyte Counts in the National Health and Nutrition Examination Survey 1999⁻2004.

Dyslipidemias and leukocytosis are associated with cardiovascular disease and immune disorders. Mechanistic studies have shown lipoprotein metabolism to play a significant role in the regulation of atherosclerosis development and leukocyte activation, whereas lipid-lowering treatments have been shown to exert beneficial anti-inflammatory and immunomodulatory effects in clinical trials. However, the relationship between clinical markers of lipid metabolism and leukocyte counts has not been extensively evaluated at the population level.

Cardiovascular Screening Practices and Attitudes From the NCAA Autonomous "Power" 5 Conferences.

Background:: The development of athlete-specific electrocardiogram (ECG) interpretation standards, along with recent rates of sudden cardiac death (SCD) in athletes being higher than previously estimated, has heightened the debate in the sports medicine community regarding cardiovascular screening of the college athlete, including whether certain high-risk subsets, such as male basketball athletes, should undergo more intensive screening.

Hypothesis:: ECG and/or echocardiography screening in National Collegiate Athletic Association Autonomous 5 Division I (A5DI) schools will be more common than previous reports, and there will be more frequent use of noninvasive cardiac screening for men's basketball players than the general athlete population.

Study Design:: Cross-sectional, quantitative study.

Effects of desiccation and starvation on thermal tolerance and the heat-shock response in forest ants.

Temperature increases associated with global climate change are likely to be accompanied by additional environmental stressors such as desiccation and food limitation, which may alter how temperature impacts organismal performance. To investigate how interactions between stressors influence thermal tolerance in the common forest ant, Aphaenogaster picea, we compared the thermal resistance of workers to heat shock with and without pre-exposure to desiccation or starvation stress. Knockdown (KD) time at 40.

Providing Epistemic Support For Assessments Through Mobile-Supported Sharing Activities.

This paper examines how participants in face-to-face conversation employ mobile phones as a resource for social action. We focus on what we call , in which participants use a mobile phone to share text or images with others by voicing text aloud from their mobile or providing others with visual access to the device's display screen. Drawing from naturalistic video recordings, we focus on how mobile-supported sharing activities invite assessments by providing access to an object that is not locally accessible to the participants.

Understanding diploid diversity: A first step in unraveling polyploid, apomictic complexity in Amelanchier.

Premise Of The Study: Delimitation of Amelanchier species is difficult because of polyploidy and gametophytic apomixis. A first step in unraveling this species problem is understanding the diversity of the diploids that contributed genomes to polyploid apomicts. This research helps clarify challenging species-delimitation problems attending polyploid, apomictic complexity.

Physical and Cognitive Performance of the Least Shrew (Cryptotis parva) on a Calcium-Restricted Diet.

Geological substrates and air pollution affect the availability of calcium to mammals in many habitats, including the Adirondack Mountain Region (Adirondacks) of the United States. Mammalian insectivores, such as shrews, may be particularly restricted in environments with low calcium. We examined the consequences of calcium restriction on the least shrew (Cryptotis parva) in the laboratory.

The effect of ionic strength on the UV-vis spectrum of congo red in aqueous solution.

The major peak near 498 nm in the ultraviolet-visible spectrum of congo red in aqueous solution shifts toward the blue while the molar absorptivity of this peak decreases predictably with increasing ionic strength. The shift was observed for solutions in which ionic strength was varied from 0.0 to 1.

Symptom reporting during physician consultation. Results of a health diary study.

Most studies of physician consultation focus on decisions to contact health care providers. In this article, the authors examine decisions regarding which symptoms to report once people contact physicians. Data for the analysis were gathered through interviews and health diaries completed by a probability sample of 667 elderly people, based on a subsample of 152 respondents who consulted physicians during the 3-week reporting period.

Noise and vibration interactions: effects on hearing.

There is the suggestion in the literature that vibration may potentiate the effects of noise and may thus increase the risk of hearing loss in a variety of exposure situations. However, in human experimental studies, which, by necessity, are limited to low levels of exposure, the effects measured are relatively small. A very limited number of animal studies have also shown an enhanced noise-induced hearing loss in the presence of vibration, but the scope of these studies is limited.

Other roles of caregivers: competing responsibilities or supportive resources.

Although the majority of research has conceptualized other roles of caregivers as competing commitments, a growing body of literature views multiple roles as supportive resources. This study examined the impact of multiple roles on the caregiving experience among informal helpers of a probability sample of elderly people living in a community setting. Results indicate that other roles, particularly when caregiving involves a large time commitment, do contribute to burden.

Employment characteristics, social support and the well-being of women.

The impact of employment on the well-being of women is examined using a theoretical framework which is based on the premise that social roles and qualities of roles affect well-being through their impact on self-esteem and social support. The nature and magnitude of the effects of employment on well-being are expected to vary according to the characteristics of employment. Two aspects of the nature of work are examined, autonomy and complexity.