752 resultados para middle-aged and older women


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"Tenth edition."

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Thesis (Master's)--University of Washington, 2016-06

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Thesis (Master's)--University of Washington, 2016-06

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Background. Older adults typically exhibit dramatic reductions in the rate of force development and deficits in the execution of rapid coordinated movements. The purpose of the current study was to investigate the association between the reduced rate of force development exhibited by older adults and the ability to coordinate groups of muscles. Methods. The performance of a visually guided aiming task that required the generation of isometric torque about the elbow joint was compared in 10 young adults (age range, 19 to 29 years) and 10 older adults (age range, 65 to 80 years). Participants were required to exert isometric torque in flexion, extension, pronation, or supination, or in combinations of these directions, to reach a target in minimum time. Surface electromyograms were obtained from the biceps brachii, triceps brachii, brachioradialis, and flexor carpi radialis. Results. Older participants exhibited slower target acquisition times compared with young participants (p < .05), with the extent of the differences between the groups varying markedly between target locations. Conclusions. The impairment in performance, although partially attributable to a general decline in the ability to produce force rapidly, was also affected by the requirements for muscular coordination. At the neuromuscular level, differences between the young and the elderly were expressed most prominently in the bifunctional muscle biceps brachii and in certain temporal aspects of muscular coordination.

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Research has demonstrated that voluntarily childless heterosexual women, and lesbian women choosing to become mothers, are negatively stereotyped. However, there is little recent Australian research, and attitudes may have changed in line with changing family formation patterns. This study assessed young Australians' attitudes towards either a lesbian or a heterosexual woman who was planning, or not planning, to have children. One hundred and nineteen first year psychology students, and members of the general public, participated. The majority of participants were under 20, female, European Australian and single. Participants read a brief description of a woman who was variously described as having a male or a female partner, and as planning or not planning to have children. As expected, participants rated the heterosexual woman more favourably than the lesbian, and the woman wanting children more positively than the woman not wanting children. However, there was a trend for the lesbian woman planning to have children to be rated as happier, more mature and more individualistic than others. The legal and social implications associated with wanting to be a lesbian mother in Australia make motherhood a more difficult process for lesbian women than it does for heterosexual women, and may explain why lesbian women who have decided to take this difficult path are seen as happier and more mature, than women making more conventional life choices. While the predominantly young, female student sample limits the generality of the findings, they suggest that social attitudes towards female sexual orientation and women's childbirth decisions are changing.

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PURPOSE. To investigate the effect of age on optokinetic nystagmus (OKN) in response to stimuli designed to preferentially stimulate the M-pathway. METHOD. OKN was recorded in 10 younger (32.3 +/- 5.98 years) and 10 older (65.6 +/- 6.53) subjects with normal vision. Vertical gratings of 0.43 or 1.08 cpd drifting at 5 degrees/s or 20 degrees/s and presented at either 8% or 80% contrast were displayed on a large screen as full-field stimulation, central stimulation within a central Gaussian-blurred window of 15 diameter, or peripheral stimulation outside this window. All conditions apart from the high-contrast condition were presented in a random order at two light levels, mesopic (1.8 cdm(-2)) and photopic (71.5 cdm(-2)). RESULTS. Partial-field data indicated that central stimulation, mesopic light levels, and lower temporal frequency each significantly increased slow-phase velocity (SPV). Although there was no overall difference between groups for partial-field stimulation, full-field stimulation, or low-contrast stimulation, a change in illumination revealed a significant interaction with age: there was a larger decrease in SPV going from photopic to mesopic conditions for the older group than the younger group, especially for higher temporal frequency stimulation. CONCLUSIONS. OKN becomes reflexive in conditions conducive to M-pathway stimulation, and this rOKN response is significantly diminished in older healthy adults than in younger healthy adults, indicative of decreased M-pathway sensitivity.