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- Aasa, Ulrika, et al.
(författare)
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Muscle strength assessment from functional performance tests : role of body size
- 2003
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Ingår i: Journal of Strength and Conditioning Research. - 1064-8011 .- 1533-4287. ; 17:4, s. 664-670
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Tidskriftsartikel (refereegranskat)abstract
- The aim of the study was to test the hypothesis that the body size plays an important role in assessment of muscle ability to exert force by standard functional performance tests. Twenty-one male students were tested on maximal isometric lift, one leg rising, vertical jump, and box lift tests, and the maximal isokinetic strength of hip and knee extensors was also recorded. When indices of the 4 functional performance tests were related to the strength of each of the 2 leg extensor muscle groups, only maximal isometric lift demonstrated positive correlation with knee extensors strength. When muscle strength was corrected for body mass, however, the aforementioned relationship became insignificant, but the 1 leg rising performance demonstrated a positive relationship with knee extensor strength. In addition, maximal isometric lift and 1 leg rising test performance provided positive and negative correlation, respectively, with body mass. The obtained findings were in line with the effects of scale applied on the tested performance. We generally conclude that the assessment of muscle capability to exert force based on some standard functional performance tests could be confounded by the body size effect.
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| 5. |
- Aberg, P., et al.
(författare)
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Skin cancer identification using multifrequency electrical impedance - A potential screening tool
- 2004
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Ingår i: IEEE Transactions on Biomedical Engineering. - 0018-9294 .- 1558-2531. ; 51:12, s. 2097-2102
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Tidskriftsartikel (refereegranskat)abstract
- Electrical bio-impedance can be used to assess skin cancers and other cutaneous lesions. The aim of this study was to distinguish skin cancer from benign nevi using multifrequency impedance spectra. Electrical impedance spectra of about 100 skin cancers and 511 benign nevi were measured. Impedance of reference skin was measured ipsi-laterally to the lesions. The impedance relation between lesion and reference skin was used to distinguish the cancers from the nevi. It was found that it is possible to separate malignant melanoma from benign nevi with 75% specificity at 100% sensitivity, and to distinguish nonmelanoma skin cancer from benign nevi with 87% specificity at 100% sensitivity. The power of skin cancer detection using electrical impedance is as good as, or better than, conventional visual screening made by general practitioners.
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- Aberg, P., et al.
(författare)
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Variation of skin properties within human forearms demonstrated by non-invasive detection and multi-way analysis
- 2002
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Ingår i: Skin research and technology. - : Wiley. - 0909-752X .- 1600-0846. ; 8:3, s. 194-201
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Tidskriftsartikel (refereegranskat)abstract
- Background: It is known that the properties of human skin vary locally. The purpose of this study was to investigate the properties of human volar forearms even further using advanced non-invasive techniques and numerical methods. Methods: The skin properties of human volar forearms were investigated using measurements of trans epidermal water loss and multifrequency electrical impedance. Eight sites on the forearms of 27 healthy volunteers were measured. The sites were oriented as squares, four sites on both left and right forearm, approximately 40-50 mm apart. Results: Analysis of variance showed significant differences for epidermal water loss (P < 0.01) and the skin impedance (P < 0.001) between the inner and outer sides of the arms. Additionally, parallel factor analysis of the full skin impedance spectra also showed that there are systematic differences between right and left arm (P < 0.01). Conclusions: It is crucial to design skin studies carefully in order to minimise the effects of the local skin properties of human skin.
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- Abramsson, Marianne
(författare)
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Housing Careers in a Changing Welfare State
- 2003
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The departure point of this thesis was changes to the welfare state. These changes began during the recession in the 1970s and were emphasised in the beginning of the 1990s. The housing market was particularly affected, as the state almost completely withdrew its engagement. Questions were raised as to how the development of the welfare state and the subsequent changes have affected different sectors of the housing market (social housing) and the housing careers of different groups.Besides the introduction the thesis consists of five papers, beginning with a review article on the effect of welfare state changes on the social housing stock in some western countries. The social housing sector (housing the lowest income groups) became more residualised as the concentration of low-income households in this sector increased in most countries. At the same time, government interest in this sector decreased.The second, third and fourth papers follow the housing careers of different groups in three Swedish municipalities during the period 1985–1995. Nest-leaving and choice of tenure of the young population, aged 16–24, in the Gävle municipality were studied. A study of two cohorts showed that nest-leaving was postponed during the recession of the early 1990s when unemployment rates were high among young people. A slight increase in moves to co-operative housing was seen during this period. Immigrants in Jönköping, Gävle and Västerås were studied. Results show that the structure of the local housing market as well as time spent in Sweden are important factors in the housing careers of immigrants. In areas with a large share of owner-occupation, immigrants live in this type of housing to a larger extent. A housing career similar to that of the Swedish population is more common among immigrants who have spent a longer time in Sweden. Residential mobility of seniors towards the city centres in the same municipalities showed only a marginal increase in this type of move. However, the characteristics of those moving were those that, to a large extent, characterise the baby boom generation born in the 1940s. As a result, this type of move can be expected to increase as this group retires.Finally, the fifth paper follows the housing career of four cohorts during the development of the welfare state after 1945. The cohorts were born in 1925, 1942, 1955 and 1970, respectively. They were interviewed about the meaning attached to the terms size, tenure and location, important factors in the development of Swedish housing policy. Despite differences in the housing market at the start of their housing careers, with time the cohorts developed similar demands on size, standard and location. Tenure was not cohort-specific but was instead discussed as degrees of freedom found in owner occupation or rental tenure.
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- Abu-Hamam, Anas, 1977-, et al.
(författare)
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Understanding Web Users Behaviour From A Web Video Camera
- 2003
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- To develop a Real-Time system, which can capture and track the web user’s head motion. Based on the head motion information, the system should be able to identify whether the user is interested in the current homepage or not. A future system property would be to find out in which area of the homepage the user’s interest is moving.
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| 10. |
- Adam, Zach, et al.
(författare)
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Chloroplast and mitochondrial proteases in Arabidopsis : a proposed nomenclature
- 2001
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Ingår i: Plant Physiology. - : Oxford University Press (OUP). - 0032-0889 .- 1532-2548. ; 125:4, s. 1912-1918
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Tidskriftsartikel (refereegranskat)abstract
- The identity and scope of chloroplast and mitochondrial proteases in higher plants has only started to become apparent in recent years. Biochemical and molecular studies suggested the existence of Clp, FtsH, and DegP proteases in chloroplasts, and a Lon protease in mitochondria, although currently the full extent of their role in organellar biogenesis and function remains poorly understood. Rapidly accumulating DNA sequence data, especially from Arabidopsis, has revealed that these proteolytic enzymes are found in plant cells in multiple isomeric forms. As a consequence, a systematic approach was taken to catalog all these isomers, to predict their intracellular location and putative processing sites, and to propose a standard nomenclature to avoid confusion and facilitate scientific communication. For the Clp protease most of the ClpP isomers are found in chloroplasts, whereas one is mitochondrial. Of the ATPase subunits, the one ClpD and two ClpC isomers are located in chloroplasts, whereas both ClpX isomers are present in mitochondria. Isomers of the Lon protease are predicted in both compartments, as are the different forms of FtsH protease. DegP, the least characterized protease in plant cells, has the most number of isomers and they are predicted to localize in several cell compartments. These predictions, along with the proposed nomenclature, will serve as a framework for future studies of all four families of proteases and their individual isomers.
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