researchers demonstrate that individuals in different levels of physical activity have different motivations for sport activity. this study was designed to examine how motivations can discriminate three physical activity levels (inactive, active, sustained maintainers) according to self-determination theory. 159 zanjan university staff (mean age: 33 years old) completed exercise motivation inve...

OBJECTIVE This 4-year longitudinal study examined the different roles of perceived stress in the association between older adults' physical activities and physical health. We hypothesized that physical activities would exert beneficial effects on physical health by preventing chronically high levels of perceived stress. METHODS We assessed baseline levels of physical activities and repeated m...

background: there is little data available on job stress dimensions and their relationship to musculoskeletal disorders (msds) among iranian nurses. the aims of this study were to investigate job stress dimensions and examine their relationship to msds among nurses of hospital affiliated to shiraz university of medical sciences (sums). methods: 385 randomly selected nurses of sums participated ...

Bacterial surface colonizers are subject to a variety of physical stresses. During the colonization of human epithelia such as on the skin or the intestinal mucosa, bacteria mainly have to withstand the mechanical stress of being removed by fluid flow, scraping, or epithelial turnover. To that end, they express a series of molecules to establish firm attachment to the epithelial surface, such a...

The cells continuously produce free radicals and reactive oxygen species as a part of metabolic processes. Increased aerobic metabolism during exercise is a potential source of oxidative stress. Also, anaerobic physical activity and oxidative stress are interrelated because the intense anaerobic activity leads to damage proteins, lipids and nucleic acids in muscle cells and blood. Complex syste...