The general topic of this work is to reveal the potential relationship between tiredness cause by hypokinetic monotonous loading and breathing. The aim was to determine if there are suitable respiratory parameters that would indicate this tirednes and, if so, then verify their validity for predicting the tiredness phenomena accompanying huge range of everyday human activities. The performed experiment was attended by five volunteers who absolved measurements of electrical activity of brain, of breathing and of chest volume changes. The course of the experiment and the behaviour of probands were recorded by a camera. In the first part of each maesuremnt, a specified monotonous task (Task Tracking) was performed. The probands have had to follow the target moving with pseudocasual direction and speed by the cursor on the monitor. This task currently reflected the level of reliability and quality of the performed aktivity. In the second part of measurement, the probands had just to relax and watch a movie. Both parts were measured in two conditions - alert and tired (after 24 hours of sleep deprivation) proband. The data were compared with each other and evaluated. The measurements and the results showed that the rate of the tiredness can be fairly reliably assessed by monitoring of the volume...

The general topic of this work is to reveal the potential relationship between tiredness cause by hypokinetic monotonous loading and breathing. The aim was to determine if there are suitable respiratory parameters that would indicate this tirednes and, if so, then verify their validity for predicting the tiredness phenomena accompanying huge range of everyday human activities. The performed experiment was attended by five volunteers who absolved measurements of electrical activity of brain, of breathing and of chest volume changes. The course of the experiment and the behaviour of probands were recorded by a camera. In the first part of each maesuremnt, a specified monotonous task (Task Tracking) was performed. The probands have had to follow the target moving with pseudocasual direction and speed by the cursor on the monitor. This task currently reflected the level of reliability and quality of the performed aktivity. In the second part of measurement, the probands had just to relax and watch a movie. Both parts were measured in two conditions - alert and tired (after 24 hours of sleep deprivation) proband. The data were compared with each other and evaluated. The measurements and the results showed that the rate of the tiredness can be fairly reliably assessed by monitoring of the volume...

L’objectif de cette thèse est d’étudier l’impact de la fatigue du consommateur sur son traitement de l’information ublicitaire. Plus précisément, nous désirons comprendre comment la fatigue influence le processus de traitement visuel de la publicité, ainsi que les attitudes et la mémorisation. En nous appuyant sur la théorie d’adéquation des ressources, nous postulons que le traitement de l’information publicitaire, et donc l’efficacité de la publicité, est optimal quand le niveau de ressources cognitives disponible (niveau de fatigue du consommateur) correspond au niveau de ressources exigé (niveau de complexité de la publicité). Nos résultats mettent en lumière des effets de la fatigue différents selon les deux échantillons de notre recherche (étudiants et salariés). Les étudiants fatigués adoptent une stratégie visuelle de balayage pour compenser les effets de la fatigue et rendre le traitement de l’information plus facile. Les salariés fatigués adoptent une stratégie visuelle d’attention soutenue consistant à mobiliser le peu de ressources disponibles pour traiter l’information de façon efficace. Cette stratégie visuelle d’attention soutenue a un impact positif sur la mémorisation de la publicité. Nous montrons enfin que la théorie d’adéquation des ressources n’est pas le cadre théorique approprié pour étudier notre objet de recherche. En effet, les ressources cognitives s’avèrent être dynamiques : si elles y sont motivées, les personnes peuvent adapter leur niveaude ressources à la tache à accomplir. Les implications théoriques, méthodologiques et managériales de ces résultats sont discutées. / This research aims at studying the impact of consumers’ tiredness on the way they perceive and process advertising information. More specifically, we try to understand how tiredness influences advertisements’ visual processing as well as consumers’ attitudes and memorization. Relying on Resource Matching theory, we hypothesize that advertising informationprocessing, and therefore advertising efficiency, is optimal when the level of available resources (consumers’ tiredness) matches the level of required resources (advertisement complexity). Results show that the impact of tiredness differs according to sample under consideration (students or staff members). Tired students adopt a “screening” visual strategyin order to compensate for tiredness effects and ease their information processing. Tired staff members adopt a “sustained attention” visual strategy consisting in mobilizing their few available resources in order to efficiently process information. In this second case, sustained visual attention leads to better advertising memorization. We show that the Resource Matching theory is not the appropriate theoretical framework to study our research object. Indeed, we find that cognitive resources are dynamic:if motivated to do so, individuals are able to adapt their resource level according to the processing task. Theoretical, methodological and managerial implications are discussed.

It was investigatet the indexes of physical charges and their changes among the basketball players of 15–16 years old. The survey was done in January and February, 2006 and there were 15 young basketballers. The aim of the survey was the changes of the young players in the acceleration of the physical strength and becoming well again. According to the pecularities of the phases of the young players and the importance of the physical strength there was an actual research in this problem, that is, to ascertain the changes of the indexesof the accelaration of the strength pointing at various physical charges and becoming well afterwards. The aims were to ascertain the hight of the players jump (hp90, Dj90 and Dj135), as well as their changes before the charge and after it, and becoming well afterwards, then to ascertain the tiredness of the muscles, the composition of the skeleton, the changes of the height of the jumps at the maximal intensivity, and to ascertain the pain of the muscles. During the warming – up the players did three experimental jumps in these ways: hp90, Dj90, Dj135. Later, the young basketball players had to do three control jumps. Then, there was a 1 minute charge test in maximum power series of the jumps. After that, they did three control jumps in all the described ways. Then, the young players had a rest for one hour. After that they had a warming – up and then three control jumps. A contact platform was used to ascertain the height of the jump with the... [to full text]

The goal of the research is to define the indicators of the muscle function, fatigue and recovery for the shin stretchers and benders, who are LCA students and soldiers, during the isokinetic load. Two groups were investigated: 17 healthy underclassmen from the Lithuanian Military Academy at the age of 18,8±0,4, and 20 healthy soldiers from the Great Lithuanian Etmon Jonusas Radvila training flock at the age of 19,8±1,1. The investigative were tested using the Biodex Medical System, the equipment allocated to the testing of human bone-muscle and rehabilitation. The testing was executed in the regime according to the specially created protocol. The maximum power of the right leg shin of the stretchers-benders and the power at the maximum speed when the fixed speed is 180 l/s was recorded. These parameters were registered before the load while doing 3 stretches and bends, and a 5-minute recovery period after the load doing 3 stretches and bends. In order to evoke tiredness 100 load of the stretching and bending was used at the fixed speed of 180 l/s. The achieved results revealed, that the benders of the first (LCA students) and the second (the soldiers) groups get less tired during the isokinetic load than stretchers. The maximum power of the first and the second group shin stretchers did not recover after a 5-minute period rest from the controlling value, and the maximum power of the shin benders recovered completely in comparion to the initial value. The muscle power of the... [to full text]

L’objectif général de ce travail doctoral était d’étudier les effets de la fatigue (physique et mentale) sur le contrôle postural. Tout d’abord, les effets de la fatigue musculaire du quadriceps fémoral induite par des contractions volontaires et des contractions électro-induites ont été comparés. Les résultats ont montré que des contractions volontaires altéraient davantage le contrôle postural que des contractions électro-induites pour une perte de force musculaire équivalente. Ceci s’expliquerait par la présence d’une fatigue centrale après les contractions volontaires, ainsi qu’une sollicitation différente des fibres musculaires entre les deux modalités de contraction. Des mécanismes compensatoires seraient mis en œuvre après ces deux modalités de contractions fatigantes, mais de façon plus prononcée pour les contractions volontaires. Concernant la fatigue mentale, les effets d’une tâche cognitive exigeante et prolongée sur ordinateur (induisant un état de fatigue mentale) et d’un visionnage de documentaire (tâche contrôle) sur le contrôle postural ont été comparés. De prime abord, la fatigue mentale affecterait le contrôle postural en condition de privation visuelle, en réduisant l’efficacité des stratégies d’attention associatives. De façon surprenante, visionner un documentaire conduirait également à une altération du contrôle postural, potentiellement en raison du maintien prolongé d’une posture assise affaissée. La posture assise pourrait ainsi constituer un facteur confondant dans les protocoles expérimentaux comportant une évaluation posturale. Une analyse statistique de classification en cluster hiérarchique a permis de mettre en évidence des sensibilités différentes au sein des individus à l’égard de la tâche mentalement fatigante. Le niveau de fatigue mentale serait associé au niveau de dégradation du contrôle postural sur un support stable avec les yeux ouverts. La réalisation d’une tâche cognitive prolongée exigeant une attention visuelle soutenue face à un écran d’ordinateur provoquerait une fatigue visuelle. Cette fatigue visuelle affecterait différemment les individus. Elle toucherait plus particulièrement les sujets les plus dépendants des informations visuelles, pour lesquels le contrôle postural se dégraderait davantage que les autres individus. / The overall objective of this doctoral work was to study the effects of fatigue (physical and mental) on postural control. First, the effects of femoral quadriceps muscle fatigue induced by voluntary contractions and electro-induced contractions were compared. The results showed that voluntary contractions affected postural control more than electro-induced contractions for an equivalent loss of muscle strength. This could be explained by the presence of central fatigue after voluntary contractions, as well as a different strain on muscle fibres between the two modes of contraction. Compensatory mechanisms would be implemented after these two modes of tiresome contractions, but more pronounced for voluntary contractions. With regard to mental fatigue, the effects of demanding and prolonged cognitive computer work (inducing mental fatigue) and documentary viewing (task control) on postural control were compared. At first glance, mental fatigue would affect postural control in conditions of visual deprivation, reducing the effectiveness of associative attention strategies. Surprisingly, viewing a documentary would also lead to an alteration in postural control, potentially due to the prolonged maintenance of a collapsed sitting posture. Sitting posture could thus be a confounding factor in experimental protocols involving postural evaluation. A statistical analysis of hierarchical cluster classification revealed different sensitivities within individuals towards the mentally demanding task. The level of mental fatigue would be associated with the level of degradation of postural control on a stable support with eyes open. Performing a prolonged cognitive task requiring sustained visual attention to a computer screen would cause visual fatigue. This visual fatigue would affect individuals differently. It would particularly affect the subjects most dependent on visual information, for which postural control would be more degraded than other individuals.