The aim of this study was to compare the central and peripheral components of cardiorespiratory fitness during incremental to maximal exercise between older men who were either recreational athletes (RA) or leisurely active (LA) men, i.e., those who fall between trained and untrained. This was a crosssectional study in which all subjects completed an exercise test on a cycle ergometer. Maximal oxygen consumption (VO2max) and ventilatory threshold (VT) were assessed using gas analysis, and central components of VO2max were assessed using a non-invasive thoracic bio-impedance device. VO2max (RA: 45.1±4.8 ml/kg/min; LA: 32.2±4.6 ml/kg/min, p≤0.001) and SV at maximal exercise (RA: 133.5±24.96 ml/beat; LA: 107.9±17.6 ml/beat, p=0.005) were higher in the RA group compared to the LA group. A plateau in SV occurred between 30-45 % of maximal exercise capacity in the RA group. No differences in SV were observed across workloads in the LA group. No differences in the calculated arterio-venous oxygen difference ((a-v)O2diff) were observed between groups. In conclusions, training volume appears to influence central components of cardiorespiratory fitness among a matched sample of older men who are neither trained nor untrained. This builds a case for increasing the volume of training to preserve cardiorespiratory fitness among older men., C. D. O'neill, D. S. Kimmerly, S. Dogra., and Obsahuje bibliografii
The relative length of telomeres measured in peripheral blood leukocytes is a commonly used system marker for biological aging and can also be used as a biomarker of cardiovascular aging. However, to what extent the telomere length in peripheral leukocytes reflects telomere length in different organ tissues is still unclear. Therefore, we have measured relative telomere length (rTL) in twelve different human tissues (peripheral blood leukocytes, liver, kidney, heart, spleen, brain, skin, triceps, tongue mucosa, intercostal skeletal muscle, subcutaneous fat, and abdominal fat) from twelve cadavers (age range of 29 week of gestation to 88 years old). The highest rTL variability was observed in peripheral leukocytes, and the lowest variability was found in brain. We found a significant linear correlation between leukocyte rTL and both intercostal muscle (R=0.68, P<0.02) and liver rTL (R=0.60, P<0.05) only. High rTL variability was observed between different organs from one individual. Furthermore, we have shown that even slight DNA degradation (modeled by sonication of genomic DNA) leads to false rTL shortening. We conclude that the rTL in peripheral leukocytes is not strongly correlated with the rTL in different organs., D. Dlouha, J. Maluskova, I. Kralova Lesna, V. Lanska, J. A. Hubacek., and Obsahuje bibliografii
Considering the preexisting influence of the process of natural aging on antioxidant enzymes activity and the level of lipid peroxidation, the age of the rats at which D-galactose (D-gal) treatment is started could strongly impact the development of D-gal induced senescence. To eval uate this, we subjected 1, 3 and 15 months old rats to D-gal treatment in parallel with having appropriate placebos (0.9 % saline). Our results showed elevated glutathione peroxidase (GPx) acti vity and no significant changes in superoxide dismutase (SOD), catalase (CAT) and glutathione reductase (GR) activity or malondialdehyde (MDA) levels in relation to natural aging. In mature and aged senescent livers we observed positive correlation between increased ratio R=SOD/(GPx+CAT) and increased MDA concentration. MDA levels seemed to correlate positively with the age of the animals at which D-gal treatment had started. In the case of 3 and 15 months old rats there was D-gal induced decrease in SOD and GR activity, but this effect of the treatment was not observed in 1 month old rats. Our results imply that the changes in the antioxidant enzyme activities are not only under the influence of the D-gal overload, but also depend on the developmental stage of the rats. According to our resu lts, with regard to enzymatic antioxidant capacity and the level of lipid peroxidation, the best age for induction of senescence is somewhere after the third month., N. Hadzi-Petrushev, V. Stojkovski, D. Mitrov, M. Mladenov., and Obsahuje bibliografii
Dyslipoproteinemie v rámci metabolického syndromu se jako jeden z klasických rizikových faktorů aterosklerotických kardiovaskulámích chorob uplatňuje i ve vyšším věku. Prediktivní význam zvýšených koncentrací celkového cholesterolu, LDL cholesterolu, HDL cholesterolu a triacylglycerolů je u geriatrických jedinců zachován. Doporučení k léčbě nejsou jednotná, ale shodně zdůrazňují individuální přístup. Kandidáty léčby jsou zejména nemocní s diagnózou ischemické choroby srdeční (ICHS) a se subklinickými formami iCHS, kde má léčba prokazatelný efekt do dvou let od zahájení a kde vede ke snížení rizika budoučí koronárni příhody až o 45 %. Méně často budeme léčit jedince s absencí ICHS a ostatních rizikových faktorů. Základem hypolipidemické intervence u pacientů vyššího věku je dieta. Nezapomínáme na pohybový režim. Farmakoterapie dyslipidemil je určena pro jedince s vysokým rizikem. Zahajujeme nižší dávkou obvykle fibrátů, při převažujícím zvýšení LDL-cholesterolu podáváme statiny a monitorujeme nežádoucí účinky léčby., Dyslipoproteinemia of metabolic syndrom as one among classical risk faaors of atherosclerotic cardiovascular diseases has been involved also in the aged. The prediaive value of total cholesterol, LDL cholesterol, HDL cholesterol and triacylglycerols is preserved. The therapeutic guidelines are not unique, but they stress an individual approach. Candidates of treatment are mainly the patients with diagnose of coronary heart disease (CHD) and sublinic form of CHD, where the treatment has been effeaive within two years and lead to decrease of CHD risk up to 45%. The individuals with CHD and other CHD risk faaors absent would be treated less ofl:en. The diet is an basic treatment option of hypolipidemic intervention in the elderly. We do not omit exercise. The pharmacotherapy of dyslipidaemia is used for the individuals with high risk. We usually start with lower dose of fibrates and/or statins in prevailing LDL-hypercholesterolemia, and monitor for adverse effects of such therapy., Vladimír Bláha, Dagmar Solichová, Zdeněk Zadák, Lit: 8, and Souhrn: eng
a1_Reduced tolerance to ischemia/reperfusion (IR) injury has been shown in elder human and animal hearts, however, the onset of this unfavorable phenotype and cellular mechanisms behind remain unknown. Moreover, aging may interfere with the mechanisms of innate cardioprotection (preconditioning, PC) and cause defects in protective cell signaling. We studied the changes in myocardial function and response to ischemia, as well as selected proteins involved in “pro-survival” pathways in the hearts from juvenile (1.5 months), younger adult (3 months) and mature adult (6 months) male Wistar rats. In Langendorffperfused hearts exposed to 30-min ischemia/2-h reperfusion with or without prior PC (one cycle of 5-min ischemia/5-min reperfusion), we measured occurrence of reperfusion-induced arrhythmias, recovery of contractile function (left ventricular developed pressure, LVDP, in % of pre-ischemic values), and size of infarction (IS, in % of area at risk size, TTC staining and computerized planimetry). In parallel groups, LV tissue was sampled for the detection of protein levels (WB) of Akt kinase (an effector of PI3-kinase), phosphorylated (activated) Akt (p-Akt), its target endothelial NO synthase (eNOS) and protein kinase Cε (PKCε) as components of “pro-survival” cascades. Maturation did not affect heart function, however, it impaired cardiac response to lethal IR injury (increased IS) and promoted arrhythmogenesis. PC reduced the occurrence of malignant arrhythmias, IS and improved LVDP recovery in the younger animals, while its efficacy was attenuated in the mature adults. Loss of PC protection was associated with age-dependent reduced Akt phosphorylation and levels of eNOS and PKCε in the hearts of mature animals compared with the younger ones, as well as with a failure of PC to upregulate these proteins., a2_Agingrelated alterations in myocardial response to ischemia may be caused by dysfunction of proteins involved in protective cell signaling that may occur already during the process of maturation., L. Griecsová, V. Farkašová, I. Gáblovský, V. K. M. Khandelwal, I. Bernátová, Z. Tatarková, P. Kaplan, T. Ravingerová., and Obsahuje bibliografii
Mitochondrial dysfunction and accumulation of oxidative damage have been implicated to be the major factors of aging. However, data on age-related changes in activities of mitochondrial electron transport chain (ETC) complexes remain controversial and molecular mechanisms responsible for ETC dysfunction are still largely unknown. In this study, we examined the effect of aging on activities of ETC complexes and oxidative damage to proteins and lipids in cardiac mitochondria from adult (6-month-old), old (15-month-old) and senescent (26-month-old) rats. ETC complexes I-IV displayed different extent of inhibition with age. The most significant decline occurred in complex IV activity, whereas complex II activity was unchanged in old rats and was only slightly reduced in senescent rats. Compared to adult, old and senescent rat hearts had significantly higher levels of malondialdehyde, 4-hydroxynonenal (HNE) and dityrosine, while thiol group content was reduced. Despite marked increase in HNE content with age (25 and 76 % for 15-and 26-month-old rats, respectively) Western blot analysis revealed only few HNE-protein adducts. The present study suggests that non-uniform decline in activities of ETC complexes is due, at least in part, to mitochondrial oxidative damage; however, lipid peroxidation products appear to have a limited impact on enzyme functions., Z. Tatarková ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
Accumulation of oxidative damage has been implicated to be a major causative factor in the decline in physiological functions that occur during the aging process. The mitochondrial respiratory chain is a powerful so urce of reactive oxygen species (ROS), considered as the pathogen ic agent of many diseases and aging. L-malate, a tricarboxylic acid cycle intermediate, plays an important role in transporting NADH from cytosol to mitochondria for energy production. Previous studies in our laboratory reported L-malate as a free radical scavenger in aged rats. In the present study we focused on the effect of L-malate on the activities of electron transport chain in young and aged rats. We found that mitochondrial membrane potential (MMP) and the activities of succinate dehydrogenase, NADH-cytochrome c oxidoreductase and cytochrome c oxidase in liver of aged rats were significantly decreased when compared to young control rats. Supplementation of L-malate to aged rats for 30 days slightly increased MMP and improved the activities of NADH-dehydrogenase, NADH-cytochrome c oxidoreductase and cytochrome c oxidase in liver of aged rats when compared with aged control rats. In young rats, L-malate administration increased only the activity of NADH-dehydrogenase. Our result suggested that L-malate could improve the activities of electron transport chain enzymes in aged rats., J.-L. Wu ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
This study was undertaken to in vestigate the effects of lower body positive pressure (LBPP) on cardiovascular responses during a 15-min walking trial in young (22.1±0.4 years) and elderly women (67.8±1.1 years). The application of 20 mm Hg LBPP reduced ground reaction forces by 31.2±0.5 kgw in both groups. We hypothesized that cardiovascular responses to LBPP during walking were different between the young and elderly subjects. Applying 20 mm Hg of LBPP increased diastolic and mean blood pressure but not systolic blood pressure in both groups. LBPP- induced reduction in heart rate (HR) occurred more quickly in the young group compared to the elderly group (p<0.05). Applying LBPP also decreased double product (systolic blood pressure x HR) in both groups, suggesting that LBPP reduces myocardial oxygen consumption during exercise. These results suggest that heart rate responses to LBPP during exercise vary with increasing age., T. Sota ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
V článku se popisuje vývoj spotřeby léčiv v ČR ve vztahu k demografické struktuře obyvatel. Na základě vlastního výběrového šetření mezi více než i 700 respondenty ve věku 60 a více let je referováno o průměrné spotřebě léčiv podle pohlaví a věku, je podán přehled nejčastěji předepisovaných léků a léků volně prodejných, výše doplatků za léky. Při preskripci by mělo být vedle hlediska účinnosti a bezpečnosti u předepisovaných léků bráno v úvahu hledisko ekonomické racionality, jako naléhavé se jeví postupné vypracování farmakoterapeutických guidelines pro léčení seniorů, výchova lékařů v klinické farmakoekonomice a prohloubení spolupráce mezi lékari, farmaceuty a pacienty., Changes of drug consumption in relation to the demographical structure of the poplation in Czech Republic are described in the paper. On the basis of own selective examination in more than 1700 respondents of age 60+, mean consumption of drugs accordig to age and gender, summary of most frequent prescribed or over-the-counter drugs and the extent of payments for drugs is referred. Beside effectiveness and safety of prescribed drugs, economical rationality should be taken into account in drug prescription. Gradual elaboration of pharmacotherapeutic guidelines for the treatment of seniors, education of physicians in clinical pharmacoeconomy and extension of collaboration between physicians, pharmacologisats and patients seems very imperative., Lenka Práznovcová, Lit: 12, and Souhrn: eng
V populaci starších osob je běžný úbytek funkčních kapacit, postupný vznik různých nemocí až k širší multimorbiditě a nárůstu problémů v sociální oblasti, které mohou akcentovat stařeckou křehkost a neschopnost žít samostatně. Článek rozebírá komplexně problematiku geriatrické multimorbidity a klade důraz na její úskalí a rizika, potřebu interdisciplinárního přístupu a myšlení lékařů, a to včetně úskalí moderní farmakoterapie. Cílem geriatrické medicíny je optimalizace reziduálních funkcí navzdory poklesu celkových funkčních kapacit organizmu při rostoucí multimorbiditě. Autoři chtějí tímto přehledovým článkem především upozornit i odbornou veřejnost na neustále rostoucí počet seniorů v populaci a na potřebu povědomí umět správně interpretovat a chápat tuto zcela novou realitu., In the elderly population there are common permanent decrease of functional capacity, gradual emergence of various diseases leading to the wider multimorbidity and increased problems in the social sphere, which can develop frailty and social dependency. The paper analyzes the complex issue of geriatric multimorbidity and emphasizes its pitfalls, the need of an interdisciplinary approach and thinking of doctors, including the risks of modern pharmacotherapy. The aim of geriatric medicine is to optimize residual functions despite the decline in total functional capacity with increasing multimorbidity. The authors want to direct the attention of the professional community to the permanently growing numbers of the elderly and to emphasize the need of awareness of the problem so that they could understand and cope with this absolutely new reality., and Pavel Weber, Dana Prudius, Hana Meluzínová