Search results for "HRV"

Partial Information Decomposition of Brain-Heart Interactions in Temporal Lobe Epilepsy in the Childhood

We apply information decomposition methods to elicit unique, redundant and synergistic causal contributions of ipsilateral and contralateral EEG activity to heart rate dynamics in epileptic children. We find that information flows from brain to heart according to opposite lateralization effects for the delta and alpha rhythms, suggesting that different neuroautonomic mechanisms take place in the pre- and post-ictal phases of temporal lobe seizures.

Stress and physical activity during a 1-year counseling intervention

2013

TIIVISTELMÄ Schildt, Kasimir Ario Vilhelm 2013. Stressi ja fyysinen aktiivisuus vuoden mittaisen neuvonta intervention aikana. Liikuntafysiologian Pro gradu -tutkielma. Liikuntabiologian laitos. Jyväskylän yliopisto. 83 sivua. Liikkumattomuus on luokiteltu maailman neljänneksi suurimmaksi kuolinsyyksi ja arviolta 3,2 miljoonaa ihmista kuolee vuosittain liikkumattomuudesta seuraaviin sairauksiin. Samaan aikaan ihmisten kokema stressi on lisääntynyt. Monissa aiemmissa tutkimuksissa fyysisen aktiivisuuden lisääminen on helpottanut stressiä. Tämän tutkimuksen tarkoitus oli selvittää, ovatko fyysinen aktiivisuus ja inaktiivisuus yhteydessä koettuun ja sykevälivaihtelun avulla mitattuun stressiin…

Post-exercise heart rate variability : a new approach to evaluation of exercise-induced physiological training load

2015

To improve maximal endurance performance, an optimal physiological training load, i.e. the balance between exercise and recovery, is required. In general, the goal of a single endurance exercise session is to transiently disturb body homeostasis after which a so-called supercompensation, an improvement in performance, can occur if the recovery period is adequate. The physical training load of a single exercise session consists of the combination of exercise intensity and duration. At the present time, there is no single tool to quantify the amount of disturbance of homeostasis that is equal to physiological training load of a single exercise session. Heart rate variability (HRV), the change…

The effects of heart rate variability and cardiac cycle time on learning in trace eye-blink conditioning

2017

Ärsykkeen sydämen sykkeeseen ajastamisella on huomattu olevan yhteyttä sensoriseen havainnointiin ja korkeampaan kognitiiviseen prosessointiin, kun sykevälivaihtelu (HRV)puolestaan on yhdistetty tarkkaavaisuuteen. Tässä tutkimuksessa tarkasteltiin sykevälivaihtelun sekä ärsykkeen sydämen sykkeeseen ajastamisen yhteyksiä oppimiseen. Koehenkilöt osallistuivat silmäniskuehdollistumiskokeeseen, missä ärsykkeet oli ajastettu joko sydämen sykkeen systoliseen tai diastoliseen vaiheeseen. HRV:n ja EEG:n mittaaminen aloitettiin viisi minuuttia ennen kokeen alkua ja sitä jatkettiin viisi minuuttia kokeen loppumisen jälkeen. Tutkimuksessa tarkasteltiin kuutta HRV-muuttujaa: sykevälin keskiarvo (MRR), …

Using Heart Rate Variability Methods for Health-Related Outcomes in Outdoor Contexts : A Scoping Review of Empirical Studies

2023

Heart rate variability (HRV) is a psychophysiological variable that is often used in applied analysis techniques to indicate health status because it provides a window into the intrinsic regulation of the autonomic nervous system. However, HRV data analysis methods are varied and complex, which has led to different approaches to data collection, analysis, and interpretation of results. Our scoping review aimed to explore the diverse use of HRV methods in studies designed to assess health outcomes in outdoor free-living contexts. Four database indexes were searched, which resulted in the identification of 17,505 candidate studies. There were 34 studies and eight systematic reviews that met t…

Increasing non-exercise physical activity : extended theory of planned behaviour model testing and the role of stress within sedentary parents

2015

Although much research has been done in studying physical activity and its health benefits, inactive behaviour has obtained little attention. The main purpose of the present study is to test the Theory of Planned Behaviour (TPB) in predicting sedentary behaviour to a group of parents with young children and a sedentary job. The secondary purpose of this study is to explore if stress explains additional variation when is entered as an additional variable between intention and sedentary behaviour. The sample consisted of 68 sedentary adults with young children, both men (N = 29) and women (N = 39), (M = 37.8 years and SD = 5.8). Participants were divided into two groups: an experimental group…

Assessing Transfer Entropy in cardiovascular and respiratory time series: A VARFI approach

2021

In the study of complex biomedical systems represented by multivariate stochastic processes, such as the cardiovascular and respiratory systems, an issue of great relevance is the description of the system dynamics spanning multiple temporal scales. Recently, the quantification of multiscale complexity based on linear parametric models, incorporating autoregressive coefficients and fractional integration, encompassing short term dynamics and long-range correlations, was extended to multivariate time series. Within this Vector AutoRegressive Fractionally Integrated (VARFI) framework formalized for Gaussian processes, in this work we propose to estimate the Transfer Entropy, or equivalently G…