University of Jyväskylä

About: University of Jyväskylä is a education organization based out in Jyvaskyla, Finland. It is known for research contribution in the topics: Population & Neutron. The organization has 8066 authors who have published 25168 publications receiving 725033 citations. The organization is also known as: Jyväskylän yliopisto & Kasvatusopillinen korkeakoulu.

Regularity of the Inverse of a Planar Sobolev Homeomorphism

Abstract: Let be a domain. Suppose that f ∈ W1,1loc(Ω,R2) is a homeomorphism such that Df(x) vanishes almost everywhere in the zero set of J f . We show that f-1 ∈ W1,1loc(f(Ω),R2) and that Df−1(y) vanishes almost everywhere in the zero set of Sharp conditions to quarantee that f−1 ∈ W1, q (f(Ω),R2) for some 1

Effects of a workplace physical exercise intervention on the intensity of headache and neck and shoulder symptoms and upper extremity muscular strength of office workers: a cluster randomized controlled cross-over trial.

Abstract: The purpose of the study was to examine the effects of a workplace physical exercise intervention on the perceived intensity of headache and the intensity of symptoms in the neck and shoulders, as well as on the extension and flexion strength of the upper extremities. The study was a cluster randomized controlled trial. The cross-over design consisted of physical exercise intervention (15 weeks) and no-intervention (15 weeks). The subjects (n=53) were office workers (mean age 46.6 (SD 8.4)) who reported headache (n=41) symptoms in the neck (n=37) or shoulders (n=41), which had restricted their daily activities during the last 12 months. Pain symptoms were measured using the Borg CR10 scale and muscular strength with a 5RM test. Statistical analyses were based on linear mixed models. Physical exercise intervention resulted in a slight, but statistically significant, decrease in the intensity of headache and neck symptoms, as well as an increase in the extension strength of the upper extremities. The mean decrease in headache during the 5-week period was 0.64 CR10 (95% CI 0.28-1.00) (P=0.001) or 49% (95% CI 22-77), and 0.42 CR10 (95% CI 0.11-0.72) (P=0.002) or 49% (95% CI 13-85) in the intensity of neck symptoms. The mean increase in the extension strength of the upper extremities was 1.3 kg (95% CI 0.5-2.1) (P=0.001) or 4% (95% CI 1-6). The intervention had no effect on the intensity of shoulder symptoms or the flexion strength of the upper extremities. Specific exercise may be clinically important to alleviate headache and neck symptoms.

Adolescents' achievement strategies, school adjustment, and externalizing and internalizing problem behaviors

Abstract: The present study investigated the relationships between the achievement strategies adolescents deploy in a school context, and their self-esteem, school adjustment, and internalizing and externalizing problem behaviors. A total of 1185 14-to-15-year-old adolescents filled in the Strategy and Attribution Questionnaire (SAQ), Rosenberg's Self-Esteem Scale, and scales measuring school adjustment, depression and externalizing problem behavior. The adolescents' parents were also asked to evaluate their children's achievement strategies, school adjustment and, externalizing problem behavior. The results revealed that low self-esteem was associated with adolescents' use of maladaptive achievement strategies which, in turn, was associated with their maladjustment at school, and internalizing and externalizing problem behaviors. Moreover, the association between adolescents' maladaptive strategies and their externalizing problem behavior was partly mediated via their school adjustment. The results suggest that the achievement strategies adolescents deploy are reflected not only in their school adjustment but also in their overall problem behavior.

Avian Clock gene polymorphism: evidence for a latitudinal cline in allele frequencies.

Abstract: In comparison with most animal behaviours, circadian rhythms have a well-characterized molecular genetic basis. Detailed studies of circadian clock genes in ‘model’ organisms provide a foundation for interpreting the functional and evolutionary significance of polymorphic circadian clock genes found within free-living animal populations. Here, we describe allelic variation in a region of the avian Clock orthologue which encodes a functionally significant polyglutamine repeat (ClkpolyQcds), within free-living populations of two passerine birds, the migratory bluethroat (Luscinia svecica) and the predominantly nonmigratory blue tit (Cyanistes caeruleus). Multiple ClkpolyQcds alleles were found within populations of both species (bluethroat: 12 populations, 7 alleles; blue tit: 14 populations, 9 alleles). Some populations of both species were differentiated at the ClkpolyQcds locus as measured by FST and RST values. Among the blue tit, but not bluethroat populations, we found evidence of latitudinal clines in (i) mean ClkpolyQcds repeat length, and (ii) the proportions of three ClkpolyQcds genotype groupings. Parallel analyses of microsatellite allele frequencies, which are considered to reflect selectively neutral processes, indicate that interpopulation allele frequency variation at the ClkpolyQcds and microsatellite loci does not reflect the same underlying demographic processes. The possibility that the observed interpopulation ClkpolyQcds allele frequency variation is, at least in part, maintained by selection for microevolutionary adaptation to photoperiodic parameters correlated with latitude warrants further study.