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A Multi-Proxy Approach to Understanding Abrupt Climate Change and Laurentide Ice Sheet Melting History Based on Gulf of Mexico SedimentsWilliams, Clare Carlisle 30 June 2014 (has links)
During the last deglaciation (ca. 24-10 ka thousand years ago (ka)), the North American Laurentide Ice Sheet (LIS) was a major source of meltwater to the Arctic Ocean, North Atlantic Ocean, and the Gulf of Mexico (GOM), and it is hypothesized that meltwater routing played an important role in regulating Late Quaternary millennial-scale climate variability, via its influence on Atlantic Meridional Overturning Circulation (AMOC). For example, the meltwater routing hypothesis predicts that a rerouting of meltwater from the GOM to the North Atlantic and/or Arctic Oceans resulted in a decrease of North Atlantic Deep Water (NADW) formation and subsequent cooling in the northern North Atlantic region, at the onset of the Younger Dryas (ca. 13 ka). The GOM was an important outlet for meltwater that likely originated from the southern margin of the LIS. Northern GOM sediments document episodic LIS meltwater input via the Mississippi River throughout the last deglaciation, and further study may provide insight to the evolution of LIS deglaciation and the hydrological response of meltwater flux to the marine depositional environment of GOM. Here, a multi-proxy geochemical study, based on marine sediments from Orca Basin, in northern GOM, aims to 1) reconstruct high-resolution records of deglacial (ca. 24-10 ka) LIS melting history to assess linkage between meltwater input to the GOM and deglacial climate change; 2) investigate the relationship between marine-based records of meltwater input and terrestrial evidence for continental deglaciation to reconstruct LIS drainage patterns within the Mississippi River watershed; and 3) reconstruct the redox state of Orca Basin sediments to evaluate the potential role of turbidity flows as a means of meltwater transport into the northern GOM. All data for this study is from core MD02-2550, a 9.09 m long giant box core, recovered from 2248 m water depth from the Orca Basin, approximately 300 km southwest of the modern Mississippi River delta. High sedimentation rates (45 cm/thousand years (kyr)) and 0.5 to 2 cm sampling resolution allow for sub-centennial sampling resolution. An anoxic hypersaline brine lake currently occupies the bottom 200 m of Orca Basin; yet, visible laminations and color changes that suggest episodic suboxic to anoxic sedimentary conditions during deglaciation, possibly related to LIS meltwater input and/or local biologic productivity.
In chapter one, paired d18O and Mg/Ca-sea-surface temperature (SST) analyses on two varieties of the surface-dwelling planktic foraminifera Globigerinoides ruber (G. ruber; (white and pink, separately)) are used to reconstruct deglacial changes in GOM seawater d18O (d18Osw). Once corrected for global ice volume, the ice volume-corrected d18Osw (d18Oivc-sw) record is primarily influenced by LIS meltwater. d18Oivc-sw records document negative excursions at ca. 19-18.2, 17.5-16.2, 15.3-14.8, and 13.7-13 ka, interpreted as four LIS melting events, followed by the cessation of meltwater at the onset of the Younger Dryas (12.9 ka). Additionally, LIS melting at ca. 17.5 ka suggests that enhanced seasonality in the North Atlantic produced mild summers sufficient for ice sheet retreat during the Mystery Interval (17.5-14.5 ka) despite extremely cold winters.
Because of the inherent difficulties in quantifying meltwater flux using d18Oivc-sw data, foraminiferal (G. ruber) Ba/Ca data are generated in chapter two to assess the influence of LIS meltwater on GOM salinity (a function of meltwater flux) during deglaciation. Ba concentrations in the Mississippi River are elevated relative to GOM seawater and are negatively correlated to sea-surface salinity. Because foraminiferal Ba/Ca (Ba/Caforam) exhibits a predictable relationship to the Ba/Ca of seawater (Ba/Casw), it may be used to calculate changes in salinity arising from deglacial variations in Mississippi River discharge. A complicating factor for Ba/Ca-based salinity interpretations is that Ba concentrations vary spatially throughout the Mississippi River watershed. For example, modern Missouri and Upper Mississippi River Ba concentrations (633 and 436 nM, respectively) are higher than that of the Ohio River (253 nM). Thus, GOM Ba/Ca variability could reflect changes in total Mississippi River input and/or shifts in the dominant region of LIS melting. Applying the modern spatial variability of Ba, we can gain insights into the pattern of ice retreat along the southern margin of the LIS during the last deglaciation.
d18Oivc-sw and Ba/Ca results suggest that meltwater, originating from the Great Lakes region, entered the GOM at ca. 19.0 ka and may have contributed to global sea level rise. A melting event at ca. 17.5 ka coincided with Lake Erie Lobe retreat and may have preconditioned the North Atlantic for AMOC instability during the Mystery Interval (ca. 17.5-14.5 ka). Elevated GOM Ba/Ca (ca. 15.6 to 14.0 ka) suggests greater meltwater input from the Ba-rich Missouri and Upper Mississippi River watershed during the second half of the Mystery Interval (ca. 16.1-14.5 ka), when wet climate conditions prevailed in the southwestern United States and Central America. Overall, Ba/Ca and d18Oivc-sw data suggest large variations in the delivery of meltwater to the Mississippi River and GOM during the last deglaciation.
In chapter three, a suite of redox sensitive trace metals (Mo, Re, U, Mn) from bulk sediment samples are analyzed to reconstruct the redox state of Orca Basin sediments, from the Last Glacial Maximum through the early Holocene (24-7 ka). Variations in the redox state of Orca Basin sediments during deglaciation may be due to changes in local biologic productivity, sediment transport, and/or regional/global physical oceanography. Laminated sediments enriched with authigenic Mo, Re, and U, suggest suboxic to anoxic conditions coincident with high total organic carbon fluxes and LIS meltwater input at ~17.0 ka. Low authigenic trace element concentrations, high quantities of terrigenous material, and abundant Cretaceous-age nannofossils in a 19-cm homogenous interval indicate a turbidite in Orca Basin at ca. 14.4 ka. This stratigraphic unit correlates with evidence from Pigmy Basin, and the Louisiana Shelf, suggesting increased meltwater flux may reflect LIS contribution to Meltwater pulse 1a (MWP-1a) sea level rise. Trace element records coupled with analyses of Orca Basin sedimentary structures will likely improve understanding of deglacial water column stratification, how meltwater entered the GOM (i.e. as a buoyant cap or at depth via sediment-laden hyperpycnal plumes), and the affects of glacial meltwater on marine biologic productivity.
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Meltwater and Abrupt Climate Change During the Last Deglaciation: A Gulf of Mexico PerspectiveWilliams, Clare C 27 March 2009 (has links)
During the last deglaciation, Greenland ice core records exhibit multiple, high frequency climate events including the Oldest Dryas, Bølling-Allerød and Younger Dryas, which may be linked to meltwater routing of the Laurentide Ice Sheet (LIS). Previous studies show episodic meltwater input, via the Mississippi River to the Gulf of Mexico (GOM) several thousand years before the onset of the Younger Dryas until ~13.0 kcal (thousand calendar) yrs, when meltwater may have switched to an eastern spillway, reducing thermohaline circulation (THC). Data from laminated Orca Basin in the GOM, constrained by 34 Accelerator Mass Spectrometry (AMS) 14C dates, provide the necessary resolution to assess GOM sea-surface temperature (SST) history and test the meltwater routing hypothesis. Paired Mg/Ca and δ18O data on the Foraminifera species Globigerinoides ruber (pink and white varieties) document the timing of meltwater input and temperature change with decadal resolution.
White G. ruber SST results show an early 5°C increase at 17.6-16.0 kcal yrs and several SST decreases, including at 16.0-14.7 kcal yrs during the Oldest Dryas (2°C) and at 12.9-11.7 kcal yrs during the Younger Dryas (2.5°C). While the early deglaciation shows strong similarities to records from Antarctica and Tobago Basin, the late deglaciation displays climate events that coincide with Greenland and Cariaco Basin records, suggesting that GOM SST is linked to both northern and southern hemisphere climate.
Isolation of the ice-volume corrected δ18O composition of seawater (δ18OGOM) shows multiple episodes of meltwater at ~16.4-15.7 kcal yrs and ~15.2-13.1 kcal yrs with white G. ruber δ18OGOM values as low as -2.5%0.
The raw radiocarbon age of the cessation of meltwater in the GOM (11.375±0.40 14C kcal yrs) is synchronous with large changes in tropical surface water Δ14C, a proxy for THC strength. An early meltwater episode beginning at 16.4 kcal yrs during the Oldest Dryas supports the suggestion of enhanced seasonality in the northern North Atlantic during Greenland stadials. We suggest a corollary to the seasonality hypothesis that in addition to extreme winters during stadials, warm summers allowed for LIS melting, which may have enhanced THC slowdown.
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En god visuell arbetsmiljö : ögonbesvär, muskuloskeletala besvär och produktivitet hos brevbärareHemphälä, Hillevi January 2008 (has links)
This study appears to be one of few intervention studies with focus on eyestrain and lighting on non-computer workplaces. Previous studies have shown strong connections between eyestrain and musculoskeletal strain. The eyes “lead the body” and if the picture on the retina is unfocused the body adjusts the posture, trying to improve the image through changing the viewing distance. This can lead to an unnatural body posture which can contribute in the development of musculoskeletal disorders. A good visual environment with proper illuminance, good luminance contrast relationship, good uniformity value of the illuminance and no glare are the best conditions in order to function well at a visually demanding work. Sorting mail is a task that needs good visual ergonomics and can therefore be improved by a change in the visual environment. The overall purpose of this thesis is to investigate if a good visual environment have an impact on eyestrain, musculoskeletal strain, productivity, wellbeing, and work induced stress. This thesis is based on a literature review and a lighting intervention, with one part before the intervention and two follow-up parts, summer and winter. The results are based on objectively measurements; lighting, time studies, and optometric eye examinations, and two questionnaires. The first questionnaire concerned visual ergonomics and the second had a focus on wellbeing and experience of work related tasks. The postmen experienced the new lighting and labeling as improvement. A small decrease in the amount of eyestrain was present, and the younger postmen had a decrease of the musculoskeletal strain. The postmen with eyestrain got a small improvement of the sorting time. When the lighting was improved another factor that could cause strain appeared, the need for good correction in their glasses was identified as the main remaining factor that could cause the observed strain. / Report code: LiU-Tek-Lic-2008:8.
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Comparison of Social Networks, Perceived Risk and HIV Risk Behaviors between Older and Younger African Americans Living in High HIV Prevalence Zip Codes of Atlanta, GeorgiaHlaing, Theint Theint 18 December 2012 (has links)
The prevalence of HIV/AIDS in the United States is still high despite advances in prevention and therapies. Among all races and ethnic groups, African Americans are the most severely affected and face a disproportionate burden. African Americans account for a higher proportion of HIV infections and deaths than other races and ethnicities. In addition, one of the fastest growing segments of AIDS cases is patients more than 50 years of age. This segment receives little attention concerning HIV infection and as the U.S. population continues to age, it is important to be aware of specific HIV-related risks faced by these older African Americans and to ensure that they get information and services to help protect them from infection. This study aims to understand and compare the social network characteristics, perceived risk of getting HIV infection and HIV risk behaviors between younger (18 to 49 years of age) and older (50 plus years of age) African Americans living in high HIV prevalence zip codes of Atlanta, Georgia. The study population included 897 African Americans. Controlling for socio-demographic variables, multivariate analyses revealed that older African Americans have significant higher proportion of injection drug use, are less likely to get tested for HIV and more likely to have a risky sex partner (i.e., exchange sex for money or drugs); however, older African Americans were less likely to engage in sexual risk behaviors. Groups did not differ in terms of their perceived risk for HIV and social network characteristics. More research is necessary to understand their HIV-related risk behaviors, both sexual and drug use, and the specific needs for primary prevention effort of HIV/AIDS transmission among older African Americans.
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The Effects of Worker Age on Lifting: Psychophysical Estimates of Acceptable Loads and their Link to BiomechanicsChen, Jade Ashley January 2012 (has links)
Canada’s workforce, as well as many other countries, is continuing to age as the baby boomer generation (those born between 1946 and 1964) ages and are remaining in the workforce longer. The number of older workers is estimated to double within the next 10 years (Perry 2010). With increased age, there are a number of factors that could influence worker performance and risk of injury. For example, aging is associated with decreased strength and cardiovascular fitness. However, it is unknown whether a worker’s estimates of how much they can safely lift (based on an approach called psychophysics, which is often used in the design of manual materials handling tasks) is lower for older compared to younger workers. The primary goal of this thesis was to test the hypothesis that psychophysical estimates of maximum acceptable forces would be lower for older workers than younger workers during selected lifting tasks. The secondary goal was to measure a host of variables to provide insights into what factors (e.g. kinematic, strength, cardiovascular) might be influencing potential age-related differences. The experimental testing protocol used a psychophysical approach to identify the maximum acceptable mass of an object during several lifting tasks. Participants comprised a total of 24 female workers (12 older (50+ years old) and 12 younger (20-30 years old)). The primary outcome of interest was the maximum acceptable weight of lift (MAWL) for an 8 hour work day that would allow each participant to ‘work as hard as they can without straining themselves, or becoming unusually tired, weakened, overheated, or out of breath’ (Snook and Ciriello 1991). The participants completed four lifting tasks: floor-to-knuckle height (1 lift/9s and 1 lift/2 min) and knuckle-to-shoulder height (1 lift/2 min and 1 lift/8 hr) by adding or removing lead shot to a lifting box. Tasks were 30 minute in duration; participants could adjust the load mass at any time during the trial. The dependent variables collected were the MAWL (the load mass at the end of the trial), maximum sagittal plane joint angles of the shoulder, hip and knee, overall and body part specific ratings of perceived exertion, and heart rate. Older workers selected MAWL values that were significantly lower (by approximately 24%) than their younger counterparts. These age-related differences were more prevalent for tasks which were constrained by strength (i.e. low frequency) compared to those with large cardiovascular requirements (i.e. high frequency). The only significant difference in the sagittal plane joint flexion angle was for the right hip during the 1 lift/2 min from floor-to-knuckle height lifting task, characterized by 34.4 degree decrease hip angle (more flexed) for the older workers. There were also no significant age-related differences in overall ratings of perceived exertion. The only body part-specific rating of perceived exertion with a significant age-related difference was for the knees, with the younger workers reporting the tasks more taxing on this joint than the older workers. Although there were no age-related differences in absolute heart rate values, the older workers were at a significantly higher percentage of their maximum heart rate. The results of this work suggest there is value in continued research probing whether current ergonomic and work design guidelines need to be updated to accommodate the aging working population. According to the results presented in this study, the current approaches often employed during the design of manual materials handling tasks (i.e. incorporating the loads that 75% of females could perform based on the Snook and Ciriello tables (1991) may not be sufficiently protective for older female workers in the workplace.
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Yngre kvinnors upplevelser av att få en bröstcancerdiagnos och livet därefterThorsell, Anna, Toresdotter, Elin January 2012 (has links)
Background: Breast cancer is one of the most common types of cancer in the world and it usually affects elderly women. However, there are between 600-700 cases per year in Sweden where women under the age of 45 are diagnosed. Removal of the breast or part of the breast, hair loss, fatigue and nausea as a result of the breast cancer treatment has an emotional and physical impact on the women’s lifeworld. The nurse should build a relationship with the women to identify and meet their needs. Aim: To describe younger women’s experiences of getting a breast cancer diagnosis and life afterwards. Method: Four biographical books were analyzed to match the aim of the study. Result: The findings were that the women experience similar thoughts and feelings when it comes to living with a cancer diagnosis. Feelings such as fear, anger and distress were expressed in the biographies. To be able to fight against the disease the women highlighted the importance of support from family members and the medical staff. Conclusion: The women’s describes both physical and mental changes due to treatment, a strong influence on the woman’s lifeworld. It is therefore important that the nurse support, comfort and assist the patient during the entire course of the disease. It might help the woman to find bright spots in life and maintain hope for the future.
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Yngre personers upplevelser av livet efter stroke / Younger persons' experiences of life after strokeDahlstrand, Anna, Mathiasson, Sofia January 2011 (has links)
Syfte: Syftet var att belysa hur yngre personer efter stroke upplevde det dagliga livet. Metod: En allmän litteraturstudie baserad på vetenskapliga artiklar gjordes. Bakgrund: I Sverige drabbas årligen 30 000 personer av stroke och uppskattningsvis lever 100 000 personer med något funktionshinder. Av de överlevande är 15-20 procent i arbetsför ålder. Stroke orsakar ett omfattande hjälpbehov hos de drabbade eftersom så många funktioner påverkas. Resultat: De som drabbas av stroke kan uppleva tiden efter som ett fysiskt och psykiskt lidande. Förändringar i den nya situationen är förenat med blandade känslor och upplevelser. Yngre personer lever ofta ett mer aktivt liv och vid insjuknande kan hela livssituationen förändras drastiskt. Ofta fick livet omvärderas och anpassning till den nya livssituationen var tvunget. Resultatdiskussion: Delaktighet i rehabiliteringen var viktigt för ett lyckat utfall. Trötthet var ett utbrett problem som ledde till många konsekvenser i vardagen. Dåligt välbefinnande skapade frågor och funderingar. Ett behov av information sågs och att vara delaktig under hela vårdprocessen var önskvärt. Slutsats: En medvetenhet hos vårdpersonal om de osynliga handikapp som förekommer samt ett lyhört förhållningssätt är viktigt för att kunna möta personen i den situation de befinner sig i. Att göra personer med stroke delaktiga i vården kan öka deras upplevelser av kontroll, meningsfullhet och livskvalitet. / Aim: The aim was to illustrate younger persons' experiences of daily life after stroke. Method: A review of the literature was conducted. Background: In Sweden 30 000 persons per year are having a stroke and approximately 100 000 persons are living with a post-stroke dysfunction. Of the survivors 15-20 percents are of working age. Result: Stroke often causes extensive needs of help from others. The persons hit by stroke could experience a suffering both physical and mental. Changes in the new situation were associated with mixed feelings and experiences. Younger persons often live a more active life and the illness may change the life situation dramatically. Often life had to be revalued and adapting to a new life situation was necessary. Discussion: Participation in rehabilitation was important for a successful outcome. Fatigue was a major problem that caused many consequences in daily life. Poor wellbeing created questions and thoughts. A need for information was seen and there was a desire of being participating in the caring. Conclusion: Awareness of invisible dysfunctions and an open mind is important to be able to meet the persons in the present situation. By involving persons with stroke in their caring it may increase their experiences of control, meaningfulness and quality of life.
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A Multidisciplinary Investigation of the Intermediate Depths of the Atlantic Ocean: AAIW delta^13C Variability During the Younger Dryas and Lithoherms in the Straits of FloridaBrookshire, Brian 2010 December 1900 (has links)
A transect of cores ranging from 798 m to 1585 m water depth in the South Atlantic
Ocean document the relative intermediate water mass nutrient geometry and stable
isotopic variability of AAIW during the Younger Dryas cooling event. The data reveal
concurrent delta^13 C and delta^18 O excursions of 0.59 ppt and 0.37 ppt within the core of
Antarctic Intermediate Water (AAIW) centered at 11,381 calendar years before present
based on radiometric age control. A portion of the delta^1 3C variability (0.22 ppt) can be
explained by a shift in thermodynamic equilibrium concurrent with a drop in
temperature of 1.8°C at the locus of AAIW formation. The remaining 0.37 ppt increase
in delta^13 C most likely resulted from increased wind velocities, and a greater coupling
between the ocean and the atmosphere at the locus of AAIW formation (increased
efficiency of the thermodynamic process).
Deepwater coral mounds are aggregates of corals, other organisms, their skeletal
remains, and sediments that occur on the seafloor of the world’s oceans. In the Straits of
Florida, these features have been referred to as lithoherms. We use digital, side-scan sonar data collected from the submarine NR-1 from an 10.9 km^2 area at ~650 m water
depth to characterize quantitatively aspects of the morphology of 216. Their lengths,
widths, heights, areas, orientations and concentration on the seafloor have been
determined. Analysis indicates that the outlines of relatively small to medium sized
lithoherms can be effectively described with a piriform function. This shape is less
applicable to the largest lithoherms because they are aggregates of smaller lithoherms.
Nearly all of the lithoherms studied have axes parallel to the northward flowing Florida
Current, and the heads of 80 percent of these features face into the current. The shape and
orientation of the lithoherms, and evidence of megaripples and scouring in the sonar data
suggest that these features are formed by a unidirectional current.
Following an extensive investigation of over 200 lithoherms via side-scan sonar
imagery and direct observation, we have developed a qualitative model for the formation
of the lithoherm type of deep-water coral mounds in the Straits of Florida. Lithoherm
formation can be characterized by four main stages of development: nucleating, juvenile,
mature singular, and fused. Fused lithoherms can form via transverse and/or
longitudinal accretion, however, transverse accretion at the head of the mound is likely
the most efficient mechanism. A comparison of lithoherm spatial relationship to local
bathymetry agrees with previous observations of deep-water coral mound formations
along the levied margins of density flow scour channels.
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En god visuell arbetsmiljö : ögonbesvär, muskuloskeletala besvär och produktivitet hos brevbärareHemphälä, Hillevi January 2008 (has links)
<p>This study appears to be one of few intervention studies with focus on eyestrain and lighting on non-computer workplaces. Previous studies have shown strong connections between eyestrain and musculoskeletal strain. The eyes “lead the body” and if the picture on the retina is unfocused the body adjusts the posture, trying to improve the image through changing the viewing distance. This can lead to an unnatural body posture which can contribute in the development of musculoskeletal disorders.</p><p>A good visual environment with proper illuminance, good luminance contrast relationship, good uniformity value of the illuminance and no glare are the best conditions in order to function well at a visually demanding work. Sorting mail is a task that needs good visual ergonomics and can therefore be improved by a change in the visual environment.</p><p>The overall purpose of this thesis is to investigate if a good visual environment have an impact on eyestrain, musculoskeletal strain, productivity, wellbeing, and work induced stress.</p><p>This thesis is based on a literature review and a lighting intervention, with one part before the intervention and two follow-up parts, summer and winter. The results are based on objectively measurements; lighting, time studies, and optometric eye examinations, and two questionnaires. The first questionnaire concerned visual ergonomics and the second had a focus on wellbeing and experience of work related tasks.</p><p>The postmen experienced the new lighting and labeling as improvement. A small decrease in the amount of eyestrain was present, and the younger postmen had a decrease of the musculoskeletal strain. The postmen with eyestrain got a small improvement of the sorting time. When the lighting was improved another factor that could cause strain appeared, the need for good correction in their glasses was identified as the main remaining factor that could cause the observed strain.</p> / Report code: LiU-Tek-Lic-2008:8.
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Livsvärlden hos den yngre kvinnan med urininkontinens: En intervjustudie om det dagliga livetNordlöf, Hanna, Mårtensson, Kajsa January 2015 (has links)
Syftet med studien var att beskriva det dagliga livet för yngre kvinnor med urininkontinens. Sju stycken kvinnor intervjuades och en öppen fråga ställdes för att få fram studiens syfte. Kvalitativ innehållsanalys genom Lundman & Hällgren Graneheim(2012) användes som analysmetod. Studiens resultat visade att urininkontinens förde med sig en rad konsekvenser för den unga kvinnan. I det dagliga livet innebar det att livet blev mindre aktivt och då var det främst påverkan på den fysiska aktiviteten kvinnorna tog upp och upplevde som ett problem. Upplevelsen att känna sig ensam, okvinnlig och mindre sexuellt attraktiv förekom och rädslan fanns ständigt där att läckaget skulle upptäckas. Kvinnan låg steget före och tänkte förebyggande genom att planlägga vart toaletter fanns, dricka minimalt och anpassa sin klädsel. Urininkontinens upplevdes svårt att prata om och var inget självklart som delades med sin närmaste familj eller vänner. Sammanfattningsvis blev konsekvenserna och anpassningarna att den unga kvinnan med urininkontinens levde i ständig beredskap i vardagen. / The aim of the study was to describe the daily lives of younger women with urinary incontinence. Seven women were interviewed and one open question was asked to produce the study's purpose. Qualitative content analysis by Hällgren Graneheim & Lundman (2012) was used as the analysis method. The study results showed that urinary incontinence entailed a number of consequences for the young woman. In daily life it meant that life became less active and then it was mainly the effect on the physical activity women took up and experienced as a problem. Experience to feel alone, unfeminine and less sexually attractive occurred and the fear was constantly there that the leakage could be detected. The woman thought prevention by designing their everyday lives. Urinary incontinence was experienced hard to talk about and were no obvious shared with their immediate family or friends. In summary, the consequences and the adjustments to the young woman with urinary incontinence lived in constant readiness in everyday life.
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