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The aim of work was to determine the effects of 8-week strength-endurance training program on somatic indicators in senior females. Applying bioelectrical impedance analysis method (InBODY 230 device) we evaluated the following parameters: body weight, BMI, body fat, total skeletal muscle mass, body fat percentage, skeletal muscle mass in left and right upper and lower extremities, trunk muscle mass, and the mineral mass in the body. To assess regularity of physical activities, variability of lifestyle and quality of life, we used a standardized survey questionnaire. The study was carried out on 29 senior citizens, of the average 70.28 years of age and BMI 26.47 kg/m². A group of active elderly women underwent an 8-week strength-endurance program, including exercises focused primarily on the development of strength abilities of the upper limbs, and secondarily on developing strength abilities of lower extremities and developing general aerobic abilities. The influence of the aerobic program induced statistically significant increase in the total skeletal muscle mass from the initial value of 22.966 kg to 23.552 kg, an increase by 0.552kg (p≤0.01) of the monitored parameter. On the contrary, the parameter of body fat percentage of the studied group showed significant decrease of the input value of 36.207%, to the output value of 35.062%, representing a change at the level of 1.145% (p ≤0.01). By assessment of changes in the muscle mass of upper limbs and the trunk, we found a statistically significant increase, which reflects a change in the total quantity of the skeletal muscle (p ≤0.005). The mineral mass in the probands increased by only 0.091 kg. However, this increase was confirmed at 0.1% level of statistical significance (p≤0.001). The above results indicate that regular performance of physical activities in groups of the elderly proves to be efficient in preventing sarcopenia, obesity and maintaining a balance of the particular tissues making up the total body composition.
Introduction. Tennis is a sport that requires asymmetric movements. Asymmetry in tennis pertains to the player carrying a racket and using it to hit the ball. An asymmetric tennis technique may lead to an asymmetric distribution of muscle mass and unbalanced muscle tonus. These disproportions will result in an improper body stature and may even cause irregularities in the skeletal structure. Aim of the Study. The aim of this study was to determine the degree of muscle mass asymmetry and its association with the dominant upper limb. Material and Methods. The study included 16 active tennis players: 15 right-handed and 1 left-handed. The control group (UN) comprised 16 non-training middle school pupils: 14 right-handed and 2 left-handed. Body composition was determined by means of bioelectrical impedance analysis (BIA). Results. Signifi cant differences between the dominant and non-dominant arms in tennis players were observed. The players featured a higher muscle mass of the dominant upper limb compared to the non-dominant limb. Similar differences were not observed amongst the controls. The control group was characterized with markedly lower asymmetry than the tennis players in terms of muscle mass distribution in the upper limbs (p < 0.05). No signifi cant correlations were found between age or training experience and the asymmetry coeffi cient values. Conclusions. The study revealed a signifi cant infl uence of sport training on asymmetry in muscle mass distribution in the upper limbs.
Conformation polymorphism (SSCP) in exons 1-3 of myogenin gene was analysed in two groups of fatteners, both out of crossbred sows (Polish Large White × Polish Landrace) sired by Duroc (group I) or Duroc × Pietrain (group II) boars. The total DNA was isolated from a whole blood using phenol/chloroform extraction. Amplifications of exons was carried out using PCR method and primers designed by computer software “Primer 3” (www.genome.wi.mit.edu).Exon 1 showed low polymorphism with two SSCP patterns: A (two bands) in 98% of group I and 94% of group I, and E (three bands) in 2% of group I and 6% of group II fatteners. Exon 2 in all fatteners was found monomorphic. Exon 3 showed high polymorphism with four SSCP patterns:A, B, C and D (one to three bands). Most frequently observed was pattern A (88% in group I and 82% in group II), while the remaining patterns occurred in 2-10% of fatteners. Sequence analysis of conformation patterns did not show any mutation sites.
Vitamin D deficiency is associated with muscle weakness. It is unknown, however, how supra-physiological levels of vitamin D affect skeletal muscle. To investigate the effects of increased serum vitamin D (1,25 (OH)2D3 or 1,25D) levels on the contractile properties of the medial gastrocnemius muscle, adult and old female Fischer344 x Brown Norway F1 rats were orally treated with vehicle or the vitamin D analogue alfacalcidol for 1 or 6 weeks. Alfacalcidol treatment resulted in elevated 1,25D serum levels. This was accompanied by hypercalcaemia and a reduction in body mass, the latter largely attributable to a reduced food intake. However, kidney function, as reflected by normal creatinine serum levels, as well as heart mass were unaffected. The 17% reduction in maximal isometric force and power was explicable by a similar loss of muscle mass. The force-frequency relationship of the 6-week-treated old rats was shifted to the left, but neither the shape of the force-velocity relationship nor the fatigability of the muscle were altered. Supra-physiological doses of vitamin D were accompanied by significant reductions in body and muscle mass, but not by an improvement in muscle functioning. Weight loss was largely due to a reduced food intake, while the left shift in the force-frequency relation may be due to increased 1,25D levels.
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