This thesis studies the performance of wireless in-house transmission systems using infrared optical signals. These studies focus in the physical layer of the transmission systems. (...)keywords: infrared; wireless communications;modulation; PPM; ambient noise; artificial light interference; frame format; IEEE 802.11Ph.D., 1998more info. http://opac.ua.pt/F/?func=find-b&find_code=SYS&REQUEST=0...
Background Intermittent hypobaric-hypoxia (IHH) and endurance-training (ET) are cardioprotective strategies against stress-stimuli. Mitochondrial modulation appears to be an important step of the process. This study aimed to analyze whether a combination of these approaches provides additive or synergistic effects improving heart-mitochondrial and cardiac-function. Methods Two-sets of rats were divided into no...
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O envelhecimento da população europeia, em particular da portuguesa, é um facto simultaneamente indicativo do nível de desenvolvimento de uma sociedade e preocupante. Para este envelhecimento têm contribuído dois factores: a diminuição das taxas de natalidade e o aumento da esperança média de vida. Para a diminuição da taxa de natalidade têm contribuído muitas razões, de entre as quais destacamos um crescente a...
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The present study evaluated the impact of moderate exercise training on the cardiac tolerance to acute pressure overload. Male Wistar rats were randomly submitted to exercise training or sedentary lifestyle for 14 wk. At the end of this period, the animals were anaesthetized, mechanically ventilated, and submitted to hemodynamic evaluation with biventricular tip pressure manometers. Acute pressure overload was ...
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