National Repository of Grey Literature 4 records found  Search took 0.00 seconds. 
HRV analysis based on PPG signal
Martinů, Žaneta ; Vítek, Martin (referee) ; Smital, Lukáš (advisor)
The thesis deals with the detection of systolic and diastolic peaks of pulse waves in a photoplethysmographic database. The detectors are implemented in MATLAB. The following part of the thesis uses the signal delineation of the photoplethysmographic signal to determine pulse rate variability. The final part of the thesis evaluates the use of pulse rate variability and compares it to the heart rate variability.
The effect of tactile and acoustic signals on reduction of signs of stress in dogs
Murínová, Karolína ; Santariová, Milena (advisor) ; Fuchs, Roman (referee)
Being touched by the human brings up physiological and behavioral feedback in the dog which indicates touch has a calming effect. Measurements taken include noticable changes in blood pressure, heart rate (HR) and heart rate variability (HRV) as well as hormonal changes - especially oxytoxin and cortisol levels. The primary objective of the fieldwork was analyzing the influence human touch has on the stressed dog and trying to bring its stress levels down using voice stimulation and a combination of voice and tactile stimuli. The dog was put into an empty room, causing elevated stress levels. After a fixed period of time the dog's owner would enter and try to calm the dog down using afromentioned treatments. The owner would then sit down on a chair and pay no more attention to the dog. The relaxing effect is being evaluated using two cardiovascular parameters, HR and HRV, and behavioural signaling. Measurements of each of the sessions are being taken three times when the dog is not moving. Phase 1 is when the dog is alone in a room, Phase 2 is taken just after the interaction with its owner has ended and Phase 3 at the end of the experiment when the dog's stress level is still. The results showed that, instead of the expected calming effect of social interaction with the owner, the effect was...
Evaluation of nutritional status and cardiac risk in patients with anorexia nervosa.
Pálová, Sabina ; Charvát, Jiří (advisor) ; Ošťádal, Petr (referee) ; Zamrazil, Václav (referee)
Anorexia nervosa (MA) is serious psychiatric disease associated with significant mortality. One of the main causes of mortality in these patients is cardiac complications. In 2003 - 2010 we examined 30 patients with established diagnosis of MA. Routinely used nutritional parameters are normal even in severe malnutrition in MA patients and we can ́t use them to diagnose or monitor nutritional status. Therefore we evaluated plasma aminoacids levels to detect minor changes of protein metabolism. According to our results we found mild hyperaminoacidemia and significant elevation of Gly/Val and Phe/Tyr ratio. In the second part of our research we performed non invasive examination s in risky patients with AN to consider possible cardiac complications. Results of ECG and echocardiography confirm results of the previous published studies. Original finding is significant decrease in flow mediated dilatation of brachial artery and its normalization after realimentation. We found also in ambulatory blood pressure monitoring significant decrease in blood pressure during the active period which was the consequence of changes in the heart rate variability. Decrease of the blood pressure in patients with AN in standing position was associated with increase of HF power in supine position and particularly with the lack of...
Evaluation of nutritional status and cardiac risk in patients with anorexia nervosa.
Pálová, Sabina ; Charvát, Jiří (advisor) ; Ošťádal, Petr (referee) ; Zamrazil, Václav (referee)
Anorexia nervosa (MA) is serious psychiatric disease associated with significant mortality. One of the main causes of mortality in these patients is cardiac complications. In 2003 - 2010 we examined 30 patients with established diagnosis of MA. Routinely used nutritional parameters are normal even in severe malnutrition in MA patients and we can ́t use them to diagnose or monitor nutritional status. Therefore we evaluated plasma aminoacids levels to detect minor changes of protein metabolism. According to our results we found mild hyperaminoacidemia and significant elevation of Gly/Val and Phe/Tyr ratio. In the second part of our research we performed non invasive examination s in risky patients with AN to consider possible cardiac complications. Results of ECG and echocardiography confirm results of the previous published studies. Original finding is significant decrease in flow mediated dilatation of brachial artery and its normalization after realimentation. We found also in ambulatory blood pressure monitoring significant decrease in blood pressure during the active period which was the consequence of changes in the heart rate variability. Decrease of the blood pressure in patients with AN in standing position was associated with increase of HF power in supine position and particularly with the lack of...

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