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See detailA DIDACTIC SURVEY OVER MAIN CHARACTERISTICS OF LAGRANGE'S THEOREM IN MATHEMATICS AND IN ECONOMICS
Xhonneux, Sebastian; Henry, Valérie ULiege

in Proceedings of the 7th CERME Conference (2011)

Because of its many uses, the constrained optimization problem is presented in most calculus courses for mathematicians but also for economists. Looking at Lagrange's Theorem we are interested in studying ... [more ▼]

Because of its many uses, the constrained optimization problem is presented in most calculus courses for mathematicians but also for economists. Looking at Lagrange's Theorem we are interested in studying the teaching of this theorem in both branches of study, mathematics and economics. This paper faces a twofold objective: first, we show the methodology of our research project concerning the didactic transposition of Lagrange's Theorem in university mathematics courses. Secondly, we would like to compare two mathematics courses given at the universities of Namur and Louvain by means of the "Anthropological Theory of Didactics" of Yves Chevallard. [less ▲]

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See detailKonformális sztereotaxiás együléses sugársebészeti kezelés: tervértékelési módszerek és eredmények.
Kovács, P.; Sebestyén, Z.; Farkas, R. et al

in Magyar Onkologia (2011), 55(2), 85-90

The purpose of our study was the objective evaluation of micro-multileaf collimator (mMLC)-based stereotactic radiosurgery treatment plans. Forty-seven patients, 71 lesions received static beam conformal ... [more ▼]

The purpose of our study was the objective evaluation of micro-multileaf collimator (mMLC)-based stereotactic radiosurgery treatment plans. Forty-seven patients, 71 lesions received static beam conformal stereotactic radiosurgery treatment in our institute between November 2005 and June 2008. Target volume and organs at risk were outlined on a MRI-CT image fusion basis. BrainSCAN 5.31 system (BrainLAB AG, Heimstetten, Germany) was used for treatment planning, Elekta Presice TS linear accelerator (Elekta Oncology Systems Ltd, Crawley, UK) and BrainLAB m3 mMLC were used for treatment delivery. An invasive head frame, mounted to the treatment table, was used with four screws for patient head fixation. Treatment plans were analysed with objective parameters, such as conformal index (COIN), homogeneity index (HI), coverage index (CI) and healthy tissue relative overdose factor (HTOF) tools. x2 tests were performed between COIN, HI and the geometrical parameters of the target volume (lesion volume - LV, lesion-organ distance - LOD, lesion deformity index - LDI). Mean value of COIN, HI, HTOF and CI was 0.52 (SD 0.13), 1.16 (SD 0.1), 0.88 (SD 0.53), and 0.94 (SD 0.11), respectively. COIN significantly correlated with (p<0.001 in all three cases), while HI was independent of LV, LOD, LDI (p=0.94; 0.14 and 0.72). COIN is similar, HTOF is less than data from the literature. According to our results geometrical parameters of the target volume (size, location, deformation) significantly influence the COIN, but they have no effect on HI. [less ▲]

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See detailCan light make us bright? Effects of light on cognition and sleep.
Chellappa, Sarah Laxhmi ULiege; Gordijn, Marijke C. M.; Cajochen, Christian

in Progress in Brain Research (2011), 190

Light elicits robust nonvisual effects on numerous physiological and behavioral variables, such as the human sleep-wake cycle and cognitive performance. Light effects crucially rely on properties such as ... [more ▼]

Light elicits robust nonvisual effects on numerous physiological and behavioral variables, such as the human sleep-wake cycle and cognitive performance. Light effects crucially rely on properties such as dose, duration, timing, and wavelength. Recently, the use of methods such as fMRI to assess light effects on nonvisual brain responses has revealed how light can optimize brain function during specific cognitive tasks, especially in tasks of sustained attention. In this chapter, we address two main issues: how light impinges on cognition via consolidation of human sleep-wake cycles; and how light directly impacts on sleep and cognition, in particular in tasks of sustained attention. A thorough understanding of how light affects sleep and cognitive performance may help to improve light settings at home and at the workplace in order to improve well-being. [less ▲]

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See detailNon-visual effects of light on melatonin, alertness and cognitive performance: can blue-enriched light keep us alert?
Chellappa, Sarah Laxhmi ULiege; Steiner, Roland; Blattner, Peter et al

in PLoS ONE (2011), 6(1), 16429

BACKGROUND: Light exposure can cascade numerous effects on the human circadian process via the non-imaging forming system, whose spectral relevance is highest in the short-wavelength range. Here we ... [more ▼]

BACKGROUND: Light exposure can cascade numerous effects on the human circadian process via the non-imaging forming system, whose spectral relevance is highest in the short-wavelength range. Here we investigated if commercially available compact fluorescent lamps with different colour temperatures can impact on alertness and cognitive performance. METHODS: Sixteen healthy young men were studied in a balanced cross-over design with light exposure of 3 different light settings (compact fluorescent lamps with light of 40 lux at 6500K and at 2500K and incandescent lamps of 40 lux at 3000K) during 2 h in the evening. RESULTS: Exposure to light at 6500K induced greater melatonin suppression, together with enhanced subjective alertness, well-being and visual comfort. With respect to cognitive performance, light at 6500K led to significantly faster reaction times in tasks associated with sustained attention (Psychomotor Vigilance and GO/NOGO Task), but not in tasks associated with executive function (Paced Visual Serial Addition Task). This cognitive improvement was strongly related with attenuated salivary melatonin levels, particularly for the light condition at 6500K. CONCLUSIONS: Our findings suggest that the sensitivity of the human alerting and cognitive response to polychromatic light at levels as low as 40 lux, is blue-shifted relative to the three-cone visual photopic system. Thus, the selection of commercially available compact fluorescent lights with different colour temperatures significantly impacts on circadian physiology and cognitive performance at home and in the workplace. [less ▲]

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See detailCortical activation patterns herald successful dream recall after NREM and REM sleep.
Chellappa, Sarah Laxhmi ULiege; Frey, Sylvia; Knoblauch, Vera et al

in Biological Psychology (2011), 87(2), 251-6

Dreaming pertains to both REM and NREM sleep. However, frequency and regional specific differences in EEG activity remains controversial. We investigated NREM and REM sleep EEG power density associated ... [more ▼]

Dreaming pertains to both REM and NREM sleep. However, frequency and regional specific differences in EEG activity remains controversial. We investigated NREM and REM sleep EEG power density associated with and without dream recall in 17 young subjects during a 40-h multiple nap protocol under constant routine conditions. NREM sleep was associated with lower EEG power density for dream recall in the delta range, particularly in frontal derivations, and in the spindle range in centro-parietal derivations. REM sleep was associated with low frontal alpha activity and with high alpha and beta activity in occipital derivations. Our data indicate that specific EEG frequency- and topography changes underlie differences between dream recall and no recall after both NREM and REM sleep awakening. This dual NREM-REM sleep modulation holds strong implications for the mechanistic understanding of this complex ongoing cognitive process. [less ▲]

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See detailLes enjeux de la sécurité alimentaire en RD Congo : approche par l'analyse de la consommation alimentaire des ménages kinois
Muteba Kalala, Damien ULiege; Duquesne, Brigitte; Lebailly, Philippe ULiege

in Brot, Jean (Ed.) XXVIèmes Journées scientifiques ATM "Crises et soutenabilité du développement" : 2-3-4 juin, BETA CNRS Université du Strasbourg (2011)

Afin d'appréhender la problématique de la sécurité alimentaire en République Démocratique du Congo, différents dispositifs de recherche ont été mis en place au départ d'un groupe de recherche ... [more ▼]

Afin d'appréhender la problématique de la sécurité alimentaire en République Démocratique du Congo, différents dispositifs de recherche ont été mis en place au départ d'un groupe de recherche interdisciplinaire en appui à la politique, financé par la coopération belge (DGCD/CUD) : Groupe de Recherche en Appui à la Politique pour l'Agriculture et l'Alimentation en Afrique (GRAP 3 A). Cet article présente l'un des axes de ce programme de recherche interuniversitaire mené conjointement avec des chercheurs de l'Université de Kinshasa : une approche de l'insécurité alimentaire et de stratégies d'une politique alimentaire durable à partir de l'étude de la consommation alimentaire des ménages de Kinshasa par différentes enquêtes qui se poursuivront au cours des quatre prochaines années. [less ▲]

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See detailIs there really an Azores diversity enigma? Insights from the phylogeography of the heather Erica scoparia s.l.
Desamore, Aurélie ULiege

Poster (2011)

The Azorean flora, in contrast to that of other archipelagos, is characterized by a paucity of evolutionary radiations and the widespread distribution of most endemics. Several hypotheses, including ... [more ▼]

The Azorean flora, in contrast to that of other archipelagos, is characterized by a paucity of evolutionary radiations and the widespread distribution of most endemics. Several hypotheses, including isolation from the continent, recent age, ecological homogeneity, and limited paleoclimatic variations, have been proposed to account for this pattern. These hypotheses are tested here within the context of the molecular phylogeography of the heather Erica scoparia s.l., a Mediterraneo-Atlantic species complex distributed across Macaronesia, North Africa and southwestern Europe. The marked molecular radiation of this species in the Azores, including an array of single-island endemics, suggests that the apparent homogeneity of the Azorean flora might, in fact, conceal undetected patterns of endemism that are similar to those observed in the Canarian flora for morphological data. Haplotype richness was higher in the Azores than in the Canaries and extensive dispersal mediated allopatry is apparent at the molecular level. The Azores were colonized at least twice independently by E. scoparia, whereas the Canarian haplotypes are monophyletic, suggesting that the greater distance between the Azores and the continent does not necessarily hamper the chances of successful colonization. [less ▲]

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See detailMarché intérieur (Libre circulation des marchandises, libre prestation de services, droit d’établissement et libre circulation des capitaux) (Juillet 2010 – Juillet 2011)
Sibony, Anne-Lise ULiege; Defossez, Alexandre ULiege

in Revue Trimestrielle de Droit Européen (2011), 46(3), 577-597

Communication from the Commission, Single Market Act Twelve levers to boost growth and strengthen confidence "Working together to create new growth", COM (2011) 206 final, ECJ C-108/09 Ker-Optika [2010 ... [more ▼]

Communication from the Commission, Single Market Act Twelve levers to boost growth and strengthen confidence "Working together to create new growth", COM (2011) 206 final, ECJ C-108/09 Ker-Optika [2010] nyr, ECJ C-565/08 Commission/Italy [2011] nyr, ECJ C-47/08 Commission/Belgium [2011] nyr, ECJ C-50/08 Commission/France[2011] nyr, ECJ C-51/08 Commission/Luxemburg [2011] nyr, ECJ C-53/08 Commission/Austria [2011] nyr, ECJ C-54/08 Commission/Germany [2011] nyr, ECJ Commission/Greece C-61/08 nyr, ECJ C-119/09 SFNEC [2011] nyr, ECJ C-25/10 Missionswerk [2011] nyr, ECJ C-10/10 Commission/Austria [2011] nyr, ECJ C-137/09 Josemans [2010] nyr. [less ▲]

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See detailDioxin2011 Highlights
Focant, Jean-François ULiege

Report (2011)

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See detailLe Michelsberg de Pont-de-Bonne (province de Liège, Belgique)
Delye, Emmanuel ULiege; Gilson, Simon-Pierre; Noiret, Pierre ULiege

in Revue Archéologique de Picardie (2011)

Since the beginning of research on the éperon barré of Pont-de-Bonne (Modave, Belgium), we have recovered artefacts attributed to the Middle Neolithic. More recently, during excavation of the entrance ... [more ▼]

Since the beginning of research on the éperon barré of Pont-de-Bonne (Modave, Belgium), we have recovered artefacts attributed to the Middle Neolithic. More recently, during excavation of the entrance system of the fortification, a pot hole and a waste accumulation zone have been analysed. These structures contained abundant archaeological material (ceramic sherd, lithic and bone artefact and fauna). Three radiometric dates have been obtained. The ceramic assemblage is typical of the Belgian Michelsberg and a decorated vase shows Bischheim affinities. [less ▲]

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See detailElectrophysiologic recurrent laryngeal nerve monitoring during thyroid and parathyroid surgery:international standards guideline statement
Randolph, Gregory; Dralle, Henning; Abdullah, hisham et al

in Laryngoscope (2011), 121

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See detailDevelopment and validation of a questionnaire assessing volitional competencies to enhance the performance of physical activities in chronic low back pain patients.
Mathy, Céline ULiege; Broonen, Jean-Paul ULiege; Henrotin, Yves ULiege et al

in BMC Musculoskeletal Disorders (2011), 12

BACKGROUND: Motivation has long been emphasized as the most important determinant of action. However, there is a substantial gap between people's goals and their attainment. Patients may be motivated and ... [more ▼]

BACKGROUND: Motivation has long been emphasized as the most important determinant of action. However, there is a substantial gap between people's goals and their attainment. Patients may be motivated and yet unable to take action if their volitional competencies are insufficient. One of the important tasks of volition is goal-maintenance. Research has stressed the importance of a volitional tool, the implementation intentions. Implementation intentions indicate where, when, and how the action leading to the goal will be performed. Forming implementation intentions favours the execution of goal-directed efforts, and reinforces the relationship between intentions and behaviours. Results from various studies clearly suggest that volitional competencies and implementation intentions could play a role in low back pain (LBP) patients. However, there is at present no questionnaire allowing assessing the capacity of implementation intentions of physical activities in LBP patients. METHODS/DESIGN: This study will develop such a questionnaire, using a 3-step approach. A first qualitative step to build categories and generate items; 30 patients suffering chronic LBP will be invited to participate in semi-structured interviews; verbatim and derived items will then be submitted to a panel of experts, using a Delphi method; a second quantitative step to examine the properties of items, and determine the factorial structure of the questionnaire; 100 patients suffering chronic LBP will be recruited to respond to this phase; and third, preliminary psychometric analyses (item-scale correlations, construct validity, reliability); 180 chronic LBP patients will be recruited for this phase of the study. The relationships between implementation intentions and variables affecting physical activity on chronic LBP patients, i.e. pain, physical capacities, fear-avoidance beliefs, kinesiophobia, work status, and level of physical activity will be considered. DISCUSSION: Developing a questionnaire to assess implementation intentions would allow investigating the role of these intentions in the transition from acute to chronic LBP. The results of this study should contribute to the understanding of the psychological processes at stake in the development of chronic LBP, and in particular to the identification of factors eventually favouring patients' participation in and adherence to active physical treatments. [less ▲]

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See detailSensitivity and resolution of ERT for soil moisture monitoring in contour hedgerow intercropping systems: a methodological analysis
Garré, Sarah ULiege; Günther, Thomas; Vanderborght, Jan et al

Scientific conference (2011)

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See detailStudy of polymorphisms in tir, eae and tccP2 genes in enterohaemorrhagic and enteropathogenic Escherichia coli of serogroup O26.
Bardiau, Marjorie ULiege; Labrozzo, S.; Mainil, Jacques ULiege

in BMC Microbiology (2011), 11

BACKGROUND: Enteropathogenic (EPEC) and enterohaemorrhagic (EHEC) Escherichia coli are responsible for food poisoning (enteritis and enterotoxaemia) in humans in developed countries. Cattle are considered ... [more ▼]

BACKGROUND: Enteropathogenic (EPEC) and enterohaemorrhagic (EHEC) Escherichia coli are responsible for food poisoning (enteritis and enterotoxaemia) in humans in developed countries. Cattle are considered to be an important reservoir of EHEC and EPEC strains for humans. Moreover, some of the strains, belonging to the O26, O111, O118 serogroups, for example, are also responsible for digestive disorders in calves. The Translocated intimin receptor (Tir), the intimin (Eae) and the Tir-cytoskeleton coupling protein (TccP) represent three virulence factors implicated in the intimate attachment of the bacteria to the eukaryotic cell. Major variants have already been described for these genes among the different serogroups but minor variations have not often been studied. In this study, we examined the polymorphisms of the tir, eae and tccP2 genes of O26 strains (EPEC and EHEC isolated from bovines and from humans) with the aim to determine whether these polymorphisms are host specific or not. RESULTS: Of the 70 tested strains, 10 strains (14% of the strains) presented one or several polymorphisms in the tir and eae genes, which have never previously been described. Concerning tccP2 detection, 47 of the 70 strains (67% of the strains) were found to be positive for this gene. Most of the strains were found to possess tccP2 variants described in strains of serogroup O26. Nevertheless, three strains had tccP2 genes respectively described in strains of serogroup O111, O103 and O55. Moreover, none of the polymorphisms was statistically specific to the bovine or the human isolates. Nevertheless, the two major variants of tccP2 were statistically associated with the pathotype (EPEC or EHEC). CONCLUSIONS: In conclusion, tir and eae gene polymorphisms were found not to be numerous and not to be predominantly synonymous. Moreover, no difference was observed between human and bovine strains regarding the presence of polymorphisms. Finally, some tccP2 variants appeared to be pathotype specific. Further investigations need to be performed on a larger number of strains in order to confirm this specificity. [less ▲]

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See detailPrevalence of the metabolic syndrome in Luxembourg according to the Joint Interim Statement definition estimated from the ORISCAV-LUX study.
Alkerwi, Ala'a; Donneau, Anne-Françoise ULiege; Sauvageot, Nicolas et al

in BMC Public Health (2011), 11(1), 4

ABSTRACT: BACKGROUND: The prevalence of the metabolic syndrome (MS) has been determined in many countries worldwide but never in Luxembourg. This research aimed to 1) establish the gender- and age ... [more ▼]

ABSTRACT: BACKGROUND: The prevalence of the metabolic syndrome (MS) has been determined in many countries worldwide but never in Luxembourg. This research aimed to 1) establish the gender- and age-specific prevalence of MS and its components in the general adult population of Luxembourg, according to the most recent Joint Interim Statement (JIS) definition, by using both the high and low cut-off points to define abdominal obesity, and 2) compare and assess the degree of agreement with the Revised National Cholesterol Education Programme-Adult Treatment Panel III (R-ATPIII) and the International Diabetes Federation (IDF) definitions. METHODS: A representative stratified random sample of 1349 European subjects, aged 18-69 years, participated to ORISCAV-LUX survey. Logistic regression and odds ratios (OR) were used to study MS prevalence with respect to gender and age. The Framingham risk score (FRS) to predict the 10-year coronary heart disease (CHD) risk was calculated to compare the proportion of MS cases below or above 20%, according to both high and low waist circumference (WC) thresholds. Cohen's kappa coefficient (kappa) was utilized to measure the degree of agreement between MS definitions. RESULTS: The prevalence of the MS defined by the JIS was 28.0% and 24.7% when using the low (94/80) and the high (102/88) WC cut-off points, respectively. The prevalence was significantly higher in men than in women (OR = 2.6 and 2.3 for the low and high WC thresholds), as were all components of the MS except abdominal obesity measured by both thresholds. It also increased with age (OR values in age categories ranging from 2.7 to 28 when compared to the younger subjects for low WC and from 3.3 to 31 for the high WC cut-offs). The 10-year predicted risk of CHD by FRS did not depend on the threshold used. Globally, excellent agreement was observed between the three definitions of MS (kappa= 0.89), in particular between JIS and IDF (kappa = 0.93). Agreement was significantly higher in women than in men, and differed between age groups. CONCLUSION: Regardless of the definition used, the adult population of Luxembourg reveals a high MS prevalence. Our findings contribute to build evidence regarding the definitive construct of the MS, to help selecting the waist circumference thresholds for Europid populations, and to support the need to revise the guidelines for abdominal obesity levels. [less ▲]

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See detailFrom Fitz Teufel to Leo Bassi: Happening and Provocation
Hamers, Jérémy ULiege

in Prospero European Review Theatre and Research (2011), 2

In this short article I examine some theatrical performances which might be placed under the umbrella of ‘provocation’, and which are understood here as moments of political activism. First of all, I ... [more ▼]

In this short article I examine some theatrical performances which might be placed under the umbrella of ‘provocation’, and which are understood here as moments of political activism. First of all, I briefly evoke some actions produced by the students’ protest movement at the end of the Sixties in Berlin. Then, I consider the problems which threaten every political provocation and which appear as challenges to the political theatrical creation; namely overbidding and inflation. Finally, I evoke possible answers to these challenges, especially through several performances of the duo of political activists known as the Yes Men, and those of the Italian “clown” Leo Bassi. Their happenings or performances, at least partly, transcend the limitations which can turn a political provocation into an ineffective, commercialized and bankable product. [less ▲]

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See detailBelgië getekend - La Belgique dessinée
Deschouwer, Kris; Kavadias, Dimokritos; Reuchamps, Min ULiege

Report (2011)

La Belgique de demain peine actuelle-ment à être dessinée. C’est dans ce con-texte qu’entre octobre et décembre 2010 nous avons demandé à plus de 5000 étudiants, néerlandophones et franco-phones, de ... [more ▼]

La Belgique de demain peine actuelle-ment à être dessinée. C’est dans ce con-texte qu’entre octobre et décembre 2010 nous avons demandé à plus de 5000 étudiants, néerlandophones et franco-phones, de dessiner la Belgique, avant de leur demander de compléter un ques-tionnaire à propos de leur vision de la Belgique, de leurs identités ainsi que de leurs attitudes et opinions politiques. Il s’agit donc d’une recherche inédite dont les données ainsi récoltées permettent de comprendre comment les citoyens qui seront appelés à dessiner la Bel-gique de demain voient leur pays. Dans ce rapport, nous présentons brièvement les premiers résultats de cette enquête qui sont actuellement affinés et mène-ront à plusieurs publications scienti-fiques. [less ▲]

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See detailShort-term complexity of cardiac autonomic control during sleep: REM as a potential risk factor for cardiovascular system in aging.
Viola, Antoine U.; Tobaldini, Eleonora; Chellappa, Sarah Laxhmi ULiege et al

in PLoS ONE (2011), 6(4), 19002

INTRODUCTION: Sleep is a complex phenomenon characterized by important modifications throughout life and by changes of autonomic cardiovascular control. Aging is associated with a reduction of the overall ... [more ▼]

INTRODUCTION: Sleep is a complex phenomenon characterized by important modifications throughout life and by changes of autonomic cardiovascular control. Aging is associated with a reduction of the overall heart rate variability (HRV) and a decrease of complexity of autonomic cardiac regulation. The aim of our study was to evaluate the HRV complexity using two entropy-derived measures, Shannon Entropy (SE) and Corrected Conditional Entropy (CCE), during sleep in young and older subjects. METHODS: A polysomnographic study was performed in 12 healthy young (21.1+/-0.8 years) and 12 healthy older subjects (64.9+/-1.9 years). After the sleep scoring, heart period time series were divided into wake (W), Stage 1-2 (S1-2), Stage 3-4 (S3-4) and REM. Two complexity indexes were assessed: SE(3) measuring the complexity of a distribution of 3-beat patterns (SE(3) is higher when all the patterns are identically distributed and it is lower when some patterns are more likely) and CCE(min) measuring the minimum amount of information that cannot be derived from the knowledge of previous values. RESULTS: Across the different sleep stages, young subjects had similar RR interval, total variance, SE(3) and CCE(min). In the older group, SE(3) and CCE(min) were reduced during REM sleep compared to S1-2, S3-4 and W. Compared to young subjects, during W and sleep the older subjects showed a lower RR interval and reduced total variance as well as a significant reduction of SE(3) and CCE(min). This decrease of entropy measures was more evident during REM sleep. CONCLUSION: Our study indicates that aging is characterized by a reduction of entropy indices of cardiovascular variability during wake/sleep cycle, more evident during REM sleep. We conclude that during aging REM sleep is associated with a simplification of cardiac control mechanisms that could lead to an impaired ability of the cardiovascular system to react to cardiovascular adverse events. [less ▲]

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