33 research outputs found

    Magnetoresistance of a 2-dimensional electron gas in a random magnetic field

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    We report magnetoresistance measurements on a two-dimensional electron gas (2DEG) made from a high mobility GaAs/AlGaAs heterostructure, where the externally applied magnetic field was expelled from regions of the semiconductor by means of superconducting lead grains randomly distributed on the surface of the sample. A theoretical explanation in excellent agreement with the experiment is given within the framework of the semiclassical Boltzmann equation.Comment: REVTEX 3.0, 11 pages, 3 Postscript figures appended. The manuscript can also be obtained from our World Wide Web server: http://roemer.fys.ku.dk/randmag.ht

    Obesity treatment—more than food and exercise: a qualitative study exploring obese adolescents' and their parents' views on the former's obesity

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    The aim of this study was to explore obese adolescents’ and their parents’ views on the former's obesity; especially to gain knowledge about barriers and motivational factors that influence obese adolescents’ ability to lose weight. This is a qualitative study involving field observation and semi-structured interviews with obese adolescents and their parents. The analysis takes a phenomenological–hermeneutic approach. Fifteen obese adolescents aged 13–16 years and their parents/grandparents participated in this study (one father, seven mothers, five sets of parents and two sets of grandparents). The results showed that obese adolescents’ are aware that they have unhealthy eating habits and they wish they were able to attain to a healthier diet. Although in poor physical shape, obese adolescents perceive their daily level of exercise as moderate. Obese adolescents blame themselves for being obese and blame their parents for an unhealthy diet, and for being unsupportive regarding exercise. Parents blame their obese child of lacking will power to change eating and exercise habits. As a consequence, the homely atmosphere is often characterised by quarrels and negative feelings. The conclusion is that despite obese adolescents’ intention of reducing weight, underlying issues interfere with this goal. This is particularly related to quarrels with parents, self-blame and misguided understanding of eating and exercising habits. These matters need to be addressed when treating obesity among adolescents

    A Qualitative, Longitudinal Study Exploring Obese Adolescents' Attitudes Toward Physical Activity

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    Background: Individuals' attitude toward physical activity may contribute to their willingness to participate in such behavior. This study qualitatively and longitudinally explored obese adolescents' attitudes to physical activity. Methods: Fifteen obese adolescents were recruited at a weight loss camp. Participants were followed for 2.5 years with 3 yearly rounds of participant observations and interviews. Data were analyzed using a phenomenological- hermeneutic approach. Results: Four categories were identified: 1) throughout the study participants became more sedentary as they de-selected activities like bike riding; 2) participants did not perceive their increasing inactive lifestyle as hindering weight loss as they consider such activities as futile compared with vigorously hard exercise; 3) participants frequently failed to participate in hard exercise, like going to the gym; and 4) participants had a genuine antipathy against being physical active. Conclusions: Among others, a reason why obese adolescents fail to live an active life is that they find limited pleasure in such behavior. It is argued that obese adolescents need a positive attitude toward physical activity if they are to be more active. With reference to Bourdieu's theory of practice, it is hypothesized that such attitude needs to be learned through everyday life by experiencing joy and meaning by being physical active.</p

    A Qualitative, Longitudinal Study Exploring Obese Adolescents’ Attitudes Toward Physical Activity

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    Background:Individuals’ attitude toward physical activity may contribute to their willingness to participate in such behavior. This study qualitatively and longitudinally explored obese adolescents’ attitudes to physical activity.Methods:Fifteen obese adolescents were recruited at a weight loss camp. Participants were followed for 2.5 years with 3 yearly rounds of participant observations and interviews. Data were analyzed using a phenomenological-hermeneutic approach.Results:Four categories were identified: 1) throughout the study participants became more sedentary as they de-selected activities like bike riding; 2) participants did not perceive their increasing inactive lifestyle as hindering weight loss as they consider such activities as futile compared with vigorously hard exercise; 3) participants frequently failed to participate in hard exercise, like going to the gym; and 4) participants had a genuine antipathy against being physical active.Conclusions:Among others, a reason why obese adolescents fail to live an active life is that they find limited pleasure in such behavior. It is argued that obese adolescents need a positive attitude toward physical activity if they are to be more active. With reference to Bourdieu’s theory of practice, it is hypothesized that such attitude needs to be learned through everyday life by experiencing joy and meaning by being physical active.</jats:sec
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