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Background: The human body may be investigated on a variety of levels. This paper deals with the issue of self-perception of the body by sportsmen and motivation strategies they use. The aim of the study was twofold: firstly, to determine whether the sports discipline affects satisfaction with one’s own body and the level of motivation; and secondly, to establish if the type of sports motivation is dependent on the body image. Material and methods: The subject group comprised athletes (n = 42) and swimmers (n = 35). The subjects completed questionnaires. The research tools included the Body Esteem Scale (BES) by Franzoi & Shields and the Sport Orientation Questionnaire (SOQ) by Gill and Dieter. Results: The results were analysed separately for each gender (according to the applied tool (BES)). Significant differences in self-perception of the body occurred in males in terms of the sports discipline, and the athletes perceived themselves better (Physical attractiveness [p < 0.01; F(8,33)] Body strength [p < 0.05; F(4,17)] Physical condition [p < 0.02; F(5,63)]). The differences did not occur in the female group. The same applies to the whole study group in terms of the level of motivation. Regression analysis demonstrated that the body image was a significantly independent variable in the case of motivation focused on the aim (females [the sexual attractiveness subscale] β = 0.46; males [the physical condition subscale] β = 0.35). In terms of the sports discipline, there are significant differences in satisfaction with the body; however, they occur only among males. The subject athletes expressed greater satisfaction with their bodies. Conclusions: The body image, perceived among female subjects as an object (also sexual), affects the level of sports motivation focused on the aim. For males, the aspect of body capability, i.e. physical condition, is the factor responsible for an increase in the motivation focused on the aim.
The aim of the work was to assess the effects of MPEP - a selective mGluR5 receptor antagonist with anti-anxiety properties - on the behaviour of rats in a situation of predicted and inevitable stress. Wistar rats kept under a reversed light-dark cycle (the light phase starting at 8 pm) were subjected to a stress procedure including immobilisation for two hours a day during five subsequent days. Prior to the first stress, tests were performed to evaluate general motor activity and activity in the central field (a fear response). On subsequent days the tests were repeated immediately before immobilisation at 24-hour intervals. After the last immobilisation, all animals were moved to their original cages. After a 48-hour break, the animals were divided into two groups: a control group, which received 0.9% NaCl (1 mL/kg i.p.), and a test group, which received MPEP (10 mg/1mL/kg i.p.) Sixty minutes after injections, examinations preceding the expected stress were repeated in the control and test groups. A four-day stress significantly reduced the total number of passages between fields and the activity in the central field compared with the situation prior to stress. A 48-hour break after the last stress situation resulted in a significant increase in general locomotor activity and activity in the central field in the control group. In the MPEP group, general locomotor activity was significantly reduced compared with the control group, and there was also an increased proportion of passages in the central field by comparison with the control group and with the baseline prior to a stress situation. The results of this study indicate that MPEP - an mGluR5 receptor antagonist with anti-anxiety properties - may prevent psychomotor excitation caused by a situation of predicted stress and may have anti-stress properties.
BACKGROUND AND AIMS: The aim of the present study was to investigate the effects of prolonged, intermittent infusion of β-endorphin or naloxone into the third cerebral ventricle of follicular phase ewes on kisspeptin (kiss 1) mRNA and RFamide-related peptide-3 (RFRP-3) mRNA levels in the hypothalamus. It was also examined the influence of β-endorphinergic stimulation or blockade on the expression of gonadotropin releasing hormone (GnRH) and GnRH receptor (GnRHR) proteins in the hypothalamic-pituitary unit and on luteinizing hormone (LH) secretion from the anterior pituitary gland. METHODS: The levels of GnRH and GnRHR proteins were analyzed using an enzyme-linked immunoabsorbent assay (ELISA) in selected tissue of the preoptic area-hypothalamic region: preoptic area (POA), anterior hypothalamus (AH), ventromedial hypothalamus (VM), stalk/median eminence (SME), and GnRHR in the anterior pituitary gland (AP). The Real-time PCR with SYBR Green dye was used for evaluation of kiss 1 mRNA in the POA and arcuate nucleus (ARC) and RFRP3 mRNA in the paraventricular nucleus (PVN) and in the dorsomedial hypothalamus (DMH). RESULTS: Stimulation of β-endorphin receptors significantly decreased the levels of GnRH protein and kiss 1 transcript in all analyzed structures and usually led to similar responses in the expression of GnRHR. Precisely, β-endorphin decreased the level of GnRHR protein in the POA, MBH, SME and AP, but had no significant influence on the receptor quantity in the AH. In addition, β-endorphin decreased LH secretion. Naloxone had an opposite effect on proteins biosynthetic level. CONCLUSIONS: The obtained results suggest that β-endorphin can modulate the biosynthesis and release of GnRH through complex changes in the expression of kiss 1 mRNA and GnRHR protein in the hypothalamus. It also appears, that in sheep β-endorphin influences GnRH/LH secretion by mechanism(s) excluding RFRP-3 neuronal system.
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