Search results for "APT"
showing 10 items of 5479 documents
Auditory cortical and hippocampal-system mismatch responses to duration deviants in urethane-anesthetized rats
2013
Any change in the invariant aspects of the auditory environment is of potential importance. The human brain preattentively or automatically detects such changes. The mismatch negativity (MMN) of event-related potentials (ERPs) reflects this initial stage of auditory change detection. The origin of MMN is held to be cortical. The hippocampus is associated with a later generated P3a of ERPs reflecting involuntarily attention switches towards auditory changes that are high in magnitude. The evidence for this cortico-hippocampal dichotomy is scarce, however. To shed further light on this issue, auditory cortical and hippocampal-system (CA1, dentate gyrus, subiculum) local-field potentials were …
Hospitālās trauksmes un depresijas novērtēšana pacientiem ar stomām stacionārā
2020
Bakalaura darbs “Hospitālās trauksmes un depresijas novērtēšana pacientiem ar stomu stacionārā” izstrādāts ar mērķi- izzināt hospitālās trauksmes un depresijas novērtējumu pacientiem ar stomām stacionārā. Tas balstīts uz Kolistas Rojas māszinības teorijas. Teorētiskajā daļā, izmantojot pieejamo literatūru ir apskatīti stomas pacientu klīniskie, psiholoģiskie un sociālie aspekti. Pētījums veikts izmantojot kvantitatīvo pētniecības metodi- anketēšanu. Pētījuma instrumenti ir darba autores izstrādāta anketa un hospitālās trauksmes un depresijas skala-HADS. Aptaujā piedalījās 30 pacienti dažādās vecumā grupās no 40 līdz 80 g.v. ar ileostomu vai kolostomu. Izvirzītā hipotēze, ka hospitālās trauk…
The Role of Leadership in Complex Strategic Networks: Enabling Effect Versus Emergence
2013
In today's knowledge-based economy, the sources of competitive advantage lie more and more in webs of interactions among a variety of actors (such as firms, universities, research organizations, government institutions and so on), that over time originate the emergence of strategic networks. The paper aims to shed light on the determinants of network interaction and the ensuing processes of knowledge and resource transfer and circulation, on which the networkbased sources of competitive advantage are rooted. Accordingly, by means of the adoption of the complexity system perspective, on the one hand, we underscore the emergent nature of network interactions stemming from the self-organizing …
Divu diazepāma devu ietekme uz Alcheimera slimības modeļa dzīvnieku sinaptisko plasticitāti un acetilholīna šķelšanu
2018
Šī darba mērķis bija noteikt gamma-aminosviestskābes (GABA) receptora benzodiazepīna saita agonista diazepāma (DZP) ļoti zemas (0,05 mg/kg) un vidējās (1 mg/kg) devas efektus uz Alcheimera slimības (AD) modeļa žurku sinaptisko plasticitāti un acetilholīna šķelšanu. Rezultāti rāda, ka AD modeļa žurku smadzenēs tika būtiski samazināta sinaptofizīna-1 (SYP) ekspresija un būtiski pieauga acetilholīna šķelšanās. Ļoti zema (0,05 mg/kg) diazepāma deva spēja uzlabot sinaptisko plasticitāti, savukārt abas (0,05 mg/kg un 1 mg/kg) diazepāma devas būtiski normalizēja acetilholīna šķelšanos AD modeļa žurku garozā un hipokampā. Iegūtie dati norāda uz ļoti zemas un vidējas devas diazepāma neiroprotektīvo …
Mentālā stresa izvērtējums studentiem pēc sirdsdarbības frekvences un ādas elektrodermālās aktivitātes
2018
Mūsdienās aktuāla tēma augstākajā izglītībā ir studentu piesaistīšana un noturēšana studijām, jo kā liecina pētījumi viena trešā daļa no augstākās izglītības studentiem nepabeidz bakalaura līmeņa studijas. Pamatā studentu izstāšanos no studijām apskata un analizē no psiholoģijas viedokļa, taču pēdējo 20 gadu laikā ir radusies interese par citiem faktoriem, kas noved pie studentu izstāšanās no augstskolas, tāpēc pētot vēl dziļāk šo problēmu, tiek meklētas savstarpējās saiknes starp dažādiem faktoriem, tai skaitā, veģetatīviem parametriem (sirdsdarbības frekvence un ādas elektrodermālā aktivitāte), lai pēc iespējas precīzāk noskaidrotu iemeslus un turpmāk mazinātu studentu iztāšanos no studij…
Modulations of corticospinal excitability following rapid ankle dorsiflexion in skill- and endurance-trained athletes
2022
Abstract Purpose Long-term sports training, such as skill and endurance training, leads to specific neuroplasticity. However, it remains unclear if muscle stretch-induced proprioceptive feedback influences corticospinal facilitation/inhibition differently between skill- and endurance-trained athletes. This study investigated modulation of corticospinal excitability following rapid ankle dorsiflexion between well-trained skill and endurance athletes. Methods Ten skill- and ten endurance-trained athletes participated in the study. Corticospinal excitability was tested by single- and paired-pulse transcranial magnetic stimulations (TMS) at three different latencies following passive rapid ankl…
Effects of hormonal contraceptives on physical performance and body composition
2016
The purpose of the present study was to examine the effects of hormonal contraceptive use on neuromuscular, cardiorespiratory and body composition adaptations following combined strength and endurance training period. Methods. Nineteen recreationally active women; 11 who had at least one year of hormonal contraceptive use (age 294 yr; BMI 212 kg/m2; VO2max 444 ml/kg/min) and 8 who had never used hormonal contraceptives (age 315 yr; BMI 222 kg/m2; VO2max 414 ml/kg/min) participated in the present study of combined strength and endurance training for 10 weeks. Training consisted of two maximal and explosive strength training sessions, and two high-intensity interval training sessions pe…
Different-day and same-session combined strength and endurance training : adaptations in neuromuscular and cardiorespiratory performance, body compos…
2017
This thesis investigated 1) acute neuromuscular and hormonal responses to combined strength and endurance loadings with different orders and their long-term adaptations (women), 2) adaptations in neuromuscular, hormonal, cardiorespiratory and health variables following 24 weeks of volume-equated protocols of combined training (men and women). Subjects were assigned to one of three groups: strength and endurance training on different days (DD: men n=21, women n=18), training in the same-session with either endurance before strength (ES: men n=16, women n=15) or vice versa (SE: men n=18, women n=14). DD trained 4-6 d·wk-1 with strength and endurance on alternating days. ES and SE trained 2-3 …
ADHD symptoms and maladaptive achievement strategies: the reciprocal prediction of academic performance beyond the transition to middle school
2023
This longitudinal study examined how two externalising behaviour problems, attention-deficit hyperactivity disorder (ADHD) and conduct disorder (CDs), are associated over time with low motivation (MAS), and how these problems effect academic performance. In our cross-lagged analysis, we found reciprocal effects between ADHD symptoms and MAS between Grades 5 and 6. Both domains also negatively predicted later academic performance. With CDs and MAS, no cross-lagged effects were found, although both were correlated and very stable over time, and negatively predicted later academic performance. These different kinds of externalising problem behaviours seem to differ in the way in which they int…
Changes in nocturnal heart rate variability and endurance performance during a high-intensity or high-volume endurance training period in recreationa…
2014
It is known that endurance training affects the modulation of the autonomic nervous system and heart rate variability (HRV). As a method HRV may be a potential tool to monitor trainability and endurance training adaptation. The purpose of this study was to examine changes in nocturnal HRV indices and endurance running performance during high intensity versus high volume endurance training. In total, 28 recreational male and female endurance runners (35 ± 8 year, VO2max 50 ± 5 ml/kg/min) were matched into two training groups after the 8 week basic training period (BTP) according to HRV, endurance performance and training adaptation during BTP. During the 8 week hard training period (HTP), th…