The purpose of this study was to take a critical look at a voice therapy technique known as the yawn-sigh. The voiced sigh as an approach in voice therapy has had increased use in recent years, particularly with problems of vocal hyperfunction. In this study, the physiology of the yawn-sigh was studied with video nasoendoscopy in eight normal subjects; their taped voices were also studied acous...

BACKGROUND: Dairy cows undergo physiological changes during pregnancy and lactation and cardiovascular system may alter during these periods. OBJECTIVES: Understanding the physiological effects of production periods of dairy cows on heart electrical activities can aid to better monitoring the cardiovascular system in these animals. METHODS: Five multiparous Holstein dairy cows were studied from...

background: hospitalization in the coronary care unit (ccu) is a concern for patients and their companions. different studies have presented conflicting results about the effect of visitors on physiological parameters of patients. the purpose of this study was to determine changes in physiological parameters (systolic and diastolic blood pressure and heart rate) due to presence of visitors at t...

in order to study the effect of temperature and photoperiod (pp) on development rate of different vegetative and reproductive stages of canola, an experiment was conducted at agricultural research station of gonbad during 2005-2007. the experiment was a randomized complete block design arranged in a split-plot in two conditions, for example supplemental irrigation and rainfed. there were differ...