Age Distribution--changes
Dotaz
Zobrazit nápovědu
- MeSH
- antropometrie MeSH
- dítě MeSH
- složení těla MeSH
- věkové faktory MeSH
- vývoj dítěte MeSH
- Check Tag
- dítě MeSH
This study aimed to characterize the mechanical properties of native human ligamentum flavum (LF) and correlate them with histopathological changes. Mechanical property gradients across the cranial, medial, and caudal regions of LF were mapped and compared with histological sections. We also compared lumbar spinal stenosis (LSS) samples with disc herniation (DH) samples as reference material to identify differences in mechanical properties and histopathological features. Our results revealed significant heterogeneity in LF mechanical properties, with local variations correlating with specific histopathological changes such as chondroid metaplasia and loss of elastic fibers. These findings underscore the importance of considering LF heterogeneity in mechanical characterization and provide insights into its behavior under pathological conditions.
- MeSH
- bederní obratle * patologie MeSH
- biomechanika MeSH
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- ligamentum flavum * patologie MeSH
- mechanický stres MeSH
- senioři MeSH
- spinální stenóza * patologie MeSH
- výhřez meziobratlové ploténky * patologie MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
We investigated the parameters of colored noise in EEG data of 17 722 professional drivers aged 18-70. The whole study is based upon experiments showing that biological neural networks may operate in the vicinity of the critical point and that the balance between excitation and inhibition in the human brain is important for the transfer of information. This paper is devoted to the study of EEG power spectrum which can be described best by a power function with 1/f(λ) distribution and colored noise corresponding to the critical point in the EEG signal has the value of λ = 1 (purple noise). The slow accumulation of energy and its quick release is a universal property of the 1/f distribution. The physiological mechanism causing energy dissipation in the brain seems to depend on the number and strength of the connections between clusters of neurons. With ageing, the number of connections between the neurons decreases. Learning ability and intellectual performance also decrease. Therefore, age-related changes in the λ coefficient can be anticipated. We found that absolute values of λ coefficients decrease significantly with increasing age. Deviations from this rule are related to age-dependent slowing of the dominant frequency in the alpha band. Age-dependent change in the parameter and colored noise may be indicative of age-related changes in the self-organization of brain activity. Results obtained include (i) the age-dependent decrease of the absolute values of the average λ coefficient with the regression coefficient 0.005 1/year, (ii) distribution of λ value changes related to EEG frequency bands and to localization of electrodes on the scalp, and (iii) relation of age-dependent changes of colored noise and EEG energy in separate frequency bands.
- MeSH
- dospělí MeSH
- elektrody MeSH
- elektroencefalografie přístrojové vybavení metody MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- mladý dospělý MeSH
- mozek fyziologie MeSH
- počítačové zpracování signálu MeSH
- poměr signál - šum * MeSH
- senioři MeSH
- věkové faktory MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladiství MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Women tend to gain weight with age, especially fat mass which shows also regional changes. A cross-sectional study was done on 213 Czech women with the conclusion that there is a progressive weight increase up to the menopause, an increase in absolute and relative fat contribution and fat centralisation up to the postmenopause and these changes seemed to occur even before the weight increase occurs. The same cohort was examined the same way after 3 years for further analysis. The aim was the assessment of weight gain, body composition and fat distribution changes in four age groups representing the reproductive phases in Czech women in 3-year period. 146 healthy Czech women aged 20–65 were classified according to four reproductive phases: fully reproductive women (n=34, mean age 26.96, SD 4.47), pre-menopausal women (n=34, mean age 42.23, SD 2.78), menopausal women (n=45, mean age 51.56, SD 2.61) and postmenopausal women (n=33, mean age 59.55, SD 2.82). Body weight, body composition and fat distribution were determined using classical anthropometric methods in 2000 and 2003. BMI increased significantly in all the groups except for the premenopausal group and was the greatest in the menopausal group. Increase in fat percentage was significant in the fully reproductive (p<0.001) and menopausal women (p<0.001), there was no change in the postmenopausal group. Waist, WHR, hip and subgluteal thigh circumference increase significantly in the menopausal group (p<0.01, p<0.05, p<0.05, p<0.001 respectively). The highest mean values of waist, WHR and even abdominal circumference remain in the postmenopausal group. Changes of all 14 skinfolds and the sum of the peripheral and central skinfolds are shown; the sum of peripheral skinfolds shows the same values at the end of the study while the sum of central skinfolds increases from the fully reproductive to the postmenopausal women. These results permit us to state the following conclusions: the greatest weight gain in the menopausal group suggests weight gain acceleration around menopause. Body fat mass increase terminates in the early postmenopause. Fat centralisation was proved in the menopausal women with still preserved fat deposition in the gluteofemoral area, which was also apparent in the postmenopausal group, however, the postmenopausal women show the highest values of central fat indicators.
Stárnutím dochází k řadě změn v pohybu lidského jedince. Cílem tohoto článku je porovnání rozdílů hybnosti nohy jak v dynamice oproti statice v dospělosti a ve stáří se zaměřením na střední stojnou fázi. Vedlejším cílem je nástin vztahu hybnosti a rozložení tlaků na plosce. Při měření byly využity dvě měřící metody, a to kinematická analýza (systém Qualysis) jako metoda hlavní a systém tlakoměrných vložek do bot (Pedar X) jako metoda doplňková. Výsledky ukazují na signifikantní objektivizovatelné změny v dynamice střední stojné fáze u starší populace oproti osobám středního věku.
Aging of the human being inevitably leads to the changes in movements. The aim of this study is to quantify and compare the differences in the dynamics of foot movement compared with static in adulthood and old age, focusing on the midstance period. A secondary objective is to outline the relationship with the angular distribution of pressure on the sole. For measurements two measuring methods were used. The kinematic analysis named Qualysis was used as a main method and system of plantar pressure insoles Pedar X as a complementary method. Differences were prooved by using the statistical calculation, which confirmed the hypothesis of half clear a significant degree.
- Klíčová slova
- kinematická analýza, tlakoměrné vložky,
- MeSH
- biomechanika * MeSH
- chůze * fyziologie MeSH
- dospělí MeSH
- lidé MeSH
- noha (od hlezna dolů) fyziologie MeSH
- plnění a analýza úkolů MeSH
- počítačové zpracování signálu MeSH
- pohybová aktivita fyziologie MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- stárnutí * fyziologie MeSH
- statistika jako téma MeSH
- tělesná námaha fyziologie MeSH
- tlak MeSH
- věkové faktory MeSH
- zatížení muskuloskeletálního systému fyziologie MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- Publikační typ
- srovnávací studie MeSH
Chameleon teeth develop as individual structures at a distance from the developing jaw bone during the pre-hatching period and also partially during the post-hatching period. However, in the adult, all teeth are fused together and tightly attached to the jaw bone by mineralized attachment tissue to form one functional unit. Tooth to bone as well as tooth to tooth attachments are so firm that if injury to the oral cavity occurs, several neighbouring teeth and pieces of jaw can be broken off. We analysed age-related changes in chameleon acrodont dentition, where ankylosis represents a physiological condition, whereas in mammals, ankylosis only occurs in a pathological context. The changes in hard-tissue morphology and mineral composition leading to this fusion were analysed. For this purpose, the lower jaws of chameleons were investigated using X-ray micro-computed tomography, laser-induced breakdown spectroscopy and microprobe analysis. For a long time, the dental pulp cavity remained connected with neighbouring teeth and also to the underlying bone marrow cavity. Then, a progressive filling of the dental pulp cavity by a mineralized matrix occurred, and a complex network of non-mineralized channels remained. The size of these unmineralized channels progressively decreased until they completely disappeared, and the dental pulp cavity was filled by a mineralized matrix over time. Moreover, the distribution of calcium, phosphorus and magnesium showed distinct patterns in the different regions of the tooth-bone interface, with a significant progression of mineralization in dentin as well as in the supporting bone. In conclusion, tooth-bone fusion in chameleons results from an enhanced production of mineralized tissue during post-hatching development. Uncovering the developmental processes underlying these outcomes and performing comparative studies is necessary to better understand physiological ankylosis; for that purpose, the chameleon can serve as a useful model species.
Studie zjišťovala počty a věkové rozložení nově přijatých pacientů v rozmezí let 2005-2010. Hodnoceny byly počty nově přijatých dospělých pacientů na 5 ortodontických odděleních Fakultních nemocnic ave 12 soukromých praxích v České republice. Pacienti byli rozděleni do 5-věkových skupin (18-20 let, 21 -25 let, 26-30 let, 31- 35 let, 36-40 let, 41 a více let) v nichž byly sledovány v daném časovém období změny průměrného věku pacientů. bylo hodnoceno procentuální zastoupení dospělých pacientů ve vzorku nově přijatých pacientů. Výsledky prokázaly, že roste průměrný věk nově přijatých dospělých pacientů, ale jejich počet klesá.
The work aimed at evaluation the number and age distribution of newly accepted patients between the years 2005 and 2010. The numbers of newly coming patients treated in 5 orthodontic departments of Faculty Hospitals and 12 private practices in the Czech Republic were evaluated. The patients were divided into five age groups (18-20,21 -25,26-30,31 -35,36-40,41 - more years), and the changes in the mean age of the patients were studied. Further, the proportion of adults within the new patients was determined. The results show that the mean age of new adult patients increases whilst their number decreases.
- MeSH
- dospělí MeSH
- epidemiologické studie MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- ortodoncie statistika a číselné údaje trendy MeSH
- příjem pacientů statistika a číselné údaje trendy MeSH
- věkové rozložení MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Geografické názvy
- Česká republika MeSH
... The Early Bronze Age Horizon in the Carpathian Basin 64 -- 2.1 The Vinkovci Culture 65 -- 2.2 Ada Culture ... ... Montenegro in the Late Copper Age and the EBA 77 -- 1.1 Royal/Ducal Tumuli 77 -- 1.2 The Royal Tumulus ...
1. elektronické vydání 1 online zdroj (254 stran)
