Search results for "Lee"
showing 10 items of 1847 documents
Pre-sleep arousal and sleep quality during the COVID-19 lockdown in Italy
2021
Abstract Objective The COVID-19 pandemic has strongly affected daily habits and psychological wellbeing, and many studies point to large modifications in several sleep and sleep-related domains. Nevertheless, pre-sleep arousal during the pandemic has been substantially overlooked. Since hyperarousal represents one of the main factors for the development and the perpetuation of chronic insomnia disorder, the assessment of variables associated with high levels of pre-sleep arousal during the pandemic is clinically relevant. The study aimed to assess the prevalence and predictors of perceived sleep quality and pre-sleep arousal in an Italian sample during the COVID-19 lockdown. Methods We used…
Modelling the evolution of periodicity in the periodical cicadas
2018
Background: Periodical cicadas (Magicicada spp.) have a life cycle that ends with the entire underground nymph population exhibiting a synchronized mass emergence to mate above ground. Previous studies have hypothesized that the periodical cicadas evolved from non-periodical cicadas by switching from a life-cycle length determined by body size to one determined by age. Questions: When can a mutation coding for fixed life-cycle length invade a resident population in which life-cycle length is variable? What determines the length of the fixed cycle? Methods: Numerical analysis of a mathematical model and simulations of an individual-based model. Results: If there is a sufficiently strong pred…
Aplicación de la clasificación de San Diego en el estudio médico-legal de la Muerte Súbita del Lactante
2020
INTRODUCCIÓN La Muerte Súbita del Lactante (MSL) representa un problema universal y grave. El Síndrome de Muerte Súbita del Lactante (SMSL) es la primera causa de muerte en lactantes durante el primer año de vida en países desarrollados y se define como la muerte súbita e inesperada de un lactante, que ocurre durante el sueño y permanece inexplicada tras la realización de una completa investigación postmortem (autopsia con análisis complementarios, examen del lugar de la muerte y revisión de la historia clínica). De esta definición se desprende la clasificación de San Diego basada en las categorías IA, IB y II. Tiene una patogénesis compleja y heterogénea, siendo la teoría del triple riesgo…
Titanocene Selenide Sulfides Revisited: Formation, Stabilities, and NMR Spectroscopic Properties
2019
[TiCp2S5] (phase A), [TiCp2Se5] (phase F), and five solid solutions of mixed titanocene selenide sulfides [TiCp2SexS5−x] (Cp = C5H5−) with the initial Se:S ranging from 1:4 to 4:1 (phases B–E) were prepared by reduction of elemental sulfur or selenium or their mixtures by lithium triethylhydridoborate in thf followed by the treatment with titanocene dichloride [TiCp2Cl2]. Their 77Se and 13C NMR spectra were recorded from the CS2 solution. The definite assignment of the 77Se NMR spectra was based on the PBE0/def2-TZVPP calculations of the 77Se chemical shifts and is supported by 13C NMR spectra of the samples. The following complexes in varying ratios were identified in the CS2 solutions of …
Effects of overnight military training and acute battle stress on the cognitive performance of soldiers in simulated urban combat
2022
Understanding the effect of stress, fatigue, and sleep deprivation on the ability to maintain an alert and attentive state in an ecologically valid setting is of importance as lapsing attention can, in many safety-critical professions, have devastating consequences. Here we studied the effect of close-quarters battle (CQ battle) exercise combined with overnight military training with sleep deprivation on cognitive performance, namely sustained attention and response inhibition. In addition, the effect of the CQ battle and overnight training on cardiac activity [heart rate and root mean square of the successive differences (RMSSD)] during the cognitive testing and the relationship between ca…
Forecasting pollutant emission of the urban vehicular running fleet by means of synthetic indicators
2003
The simple method here presented, devoted to the evaluation of the environmental performances of transportation systems, is mainly referred to the pollutant emission factors released within the "COPERT III” approach. The method is here adopted for building up a synthetic indicator of the whole pollutant emissions from the transportation sector in a given urban area. The indicator can be utilised in the aim of comparing the environmental effects of different transportation policies: the introducing of modal changes in the transportation demand from private cars to public vehicles, for examples, could be suitably analysed. Apart the knowledge of the proper pollutant emission factors, the meth…
Lavatanssi-illan fyysinen aktiivisuus ja siihen yhteydessä olevat tekijät
2012
Kuuttila, Kirsi 2012. Lavatanssiko liikuntaa? Lavatanssi-illan fyysinen aktiivisuus ja siihen yhteydessä olevat tekijät. Liikuntapedagogiikan Pro gradu -tutkielma. Liikuntatieteiden laitos, Jyväskylän yliopisto, 91. Tämän tutkimuksen tarkoituksena oli selvittää lavatanssin fyysistä aktiivisuutta ja siihen yhteydessä olevia tekijöitä. Tutkimukseen osallistui 58 henkilöä, joista puolet oli naisia ja puolet miehiä. Tutkimukseen ilmoittautuneet vapaaehtoiset, 35–55-vuotiaat henkilöt kerättiin Suomen Media & Action - ja Tanssikoulu Happy Dancen sähköpostilistojen kautta. Fyysistä aktiivisuutta mitattiin tutkimuksessa syke- ja askelmittarien avulla. Mittaukset toteutettiin tanssipaikka V2:lla Har…
Lavatanssiko liikuntaa? : lavatanssi-illan fyysinen aktiivisuus ja kuormittavuus sekä niihin yhteydessä olevat tekijät
2012
Lavatanssi on kasvattanut suosiotaan viime vuosikymmeninä. Terveys- ja kuntoliikuntamuotona sitä on tutkittu varsin vähän. Tutkimuksen tarkoituksena oli selvittää lavatanssin fyysistä aktiivisuutta ja kuormittavuutta sekä niihin yhteydessä olevia tekijöitä. Yhden tanssi-illan aikana tammikuussa 2011 tanssijoiden fyysistä kuormittavuutta mitattiin sykemittareilla ja fyysistä aktiivisuutta selvitettiin askelmittareilla. Taustatietoja kerättiin sähköisellä kyselylomakkeella. Tutkimukseen osallistui 58 vapaaehtoisesti ilmoittautunutta tanssinharrastajaa. Kolmen tunnin lavatanssi-illan aikana tutkittavien keskisyke oli 116 ± 16 bpm, korkein syke 160 ± 15 bpm, ja energiankulutus miehillä 2043 ± 5…
Physiological and autonomic stress responses after prolonged sleep restriction and subsequent recovery sleep in healthy young men
2018
Purpose Sleep restriction is increasingly common and associated with the development of health problems. We investigated how the neuroendocrine stress systems respond to prolonged sleep restriction and subsequent recovery sleep in healthy young men. Methods After two baseline (BL) nights of 8 h time in bed (TIB), TIB was restricted to 4 h per night for five nights (sleep restriction, SR, n = 15), followed by three recovery nights (REC) of 8 h TIB, representing a busy workweek and a recovery weekend. The control group (n = 8) had 8 h TIB throughout the experiment. A variety of autonomic cardiovascular parameters, together with salivary neuropeptide Y (NPY) and cortisol levels, were assessed.…