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The purpose of this study was to determine whether or not repeated short-term cold water immersions can induce a change in the activity of the sympathetic nervous system and, consequently, in cardiovascular functions in healthy young athletes. Changes in some plasma hormone concentrations were also followed. A single cold water immersion (head-out, at 14°C,(More)
To differentiate between the effect of cold and hydrostatic pressure on hormone and cardiovascular functions of man, a group of young men was examined during 1-h head-out immersions in water of different temperatures (32°C, 20°C and 14°C). Immersion in water at 32°C did not change rectal temperature and metabolic rate, but lowered heart rate (by 15%) and(More)
The aim of this study was to investigate whether or not the human immune system can be activated by a noninfectious stimulus, thereby improving the physiological status of the individual. The effect of a single cold water immersion (14° C for 1 h) on the immune system of athletic young men, monitored immediately after immersion, was minimal. With the(More)
The purpose of this study was to monitor changes in body and skin temperatures, heat production, subjective shivering, cold sensation and body fat content in humans after intermittent cold water immersion. Repeated exposures of young sportsmen to cold water (head out, 14 °C, 1 h, 3 times per week for 4–6 weeks) induced changes in regulation of thermal(More)
BACKGROUND The aim of the study was to determine pregnancy-associated plasma protein-A (PAPP-A), which was recently described as a new marker of cardiovascular events, in patients with chronic renal insufficiency/failure and to find out its relationship to renal function and to prominent markers of oxidative stress (advanced oxidation protein(More)
BACKGROUND Repeated exposure to cold leads to a decline in the intensity of physiological defence reactions. In the complex of adaptational responses metabolic, thermogenic and insulation reactions predominate. The objective of the present investigation was to provide evidence of the predominating type of response of sportsmen exposed repeatedly to cold in(More)
This paper deals with real time experiments with spectrum sensing in TV bands. First, different spectrum sensing algorithms suitable for fast signal detection of digital TV signals are reviewed. The performance of several selected detectors has been evaluated on data of real TV transmission in Brno region. Three different implementations have been setup -(More)
The purpose of the investigation was to assess the percentage utilization of administered glucose labelled with the natural isotope 13C during an intensive load on a bicycle ergometer (I) (1 hr, 75% VO2max) and a light load (L) (1.5 hr 45% VO2max). In the investigation participated four healthy volunteers who before pedalling drank 1.2 g.kg-1 labelled(More)
To characterize fluid and ion shifts during 5-weeks cold adaptation, 6 nonadapted volunteers underwent cold acclimation programme (CAP), consisted of 1 h head-out immersion in water 14 +/- 1 degrees C 3 times a week. Blood samples were analyzed before/after the immersion and in the first and in the last week of CAP. Urine was collected for 10 h before,(More)