OBJECTIVE The aim of this study was to quantify the stress associated with performing maritime pilotage tasks in a high-fidelity simulator. METHODS Eight trainee and 13 maritime pilots completed two simulated pilotage tasks of varying complexity. Salivary cortisol samples were collected pre- and post-simulation for both trials. Heart rate was measured continuously throughout the study. RESU...

Recent studies have confirmed heart rate fall after treadmill exercise testing, or heart rate recovery, as a powerful predictor of mortality from heart disease. Heart rate recovery depends on central reactivation of vagal tone and decreased vagal activity is a risk factor for death. If heart rate recovery is defined as the fall in heart rate after 1 minute following peak exercise, then a heart ...

conclusions children engaged with regular football practice presented enhanced physical fitness and autonomic function, by increasing vagal tone at rest. results the anthropometric and body composition characteristics were similar in both groups (p > 0.05). the groups were also similar in time spent daily on moderate-to-vigorous physical activities (fg vs. cg: 114 ± 64 vs. 87 ± 55 minutes; p > ...

background: despite the widespread use of respiratory protection equipment in different jobs, the effects of these devices on people’s physiological responses are not well recognized as yet. therefore, the aim of this study is to evaluate the effect of the air purifying respiratory protection equipment on the heart rate. methods: this experimental study was performed in a climate chamber under ...

OBJECTIVE To investigate the hypothesis that alterations in heart rate variability, peak systolic velocity variability and time-averaged velocity variability in the human umbilical artery may predict early signs of dysfunctional fetal-placental coupling in pregnancies that later develop pregnancy-induced hypertension. METHODS Doppler flow velocity recordings from the umbilical artery were per...

conclusion our findings support prone positioning for premature infants. therefore, it is advisable to nicu staff that if there is no obstacle for changing the infant’s position, prone position in infants with respiratory complications during receiving n-cpap in nicu can be useful. regarding the fact that prone position is a risk factor for sudden infant death syndrome , prone position should b...

An attempt was made to derive a useful noninvasive index to evalute a change in myocardial contractile state using transcutaneous Doppler flow-velocity curve from the carotid artery. In 5 mongrel dogs and in 43 patients with various heart disease, Doppler flow velocity curves were obtained from the ascending aorta intravascularly using a Doppler catheter and/or from carotid artery transcutaneou...

objective: several studies have shown that chichorium intybus l. (c. intybus) which possesses flavonoid compounds has an effective role in treatment of cardiovascular diseases. contractile dysfunction mostly occurs after acute myocardial infarction, cardiac bypass surgery, heart transplantation and coronary angioplasty. the aim of the present study was to investigate the effect of aqueous extra...

This paper proposes a mathematical model for the heart rate signal using hand GSR and power samples of the R peak of the ECG through multiple regression analysis. Mathematical model helps to study the relation of the dependent function with its independent functions and to correlate with the biological processes. The paper proposed four models for heart rate. Each model had R 2 values such as 0...

conclusions instillation of ropivacaine 0.2% (30 ml) within tubeless pcnl surgery does not have a significant effect on postoperative pain relief and improvement of pef within 6 hours after the operation. results we found no difference in the mean pain severity score between the case and control groups 4 hours (p = 0.332) and 6 hours (p = 0.830) after the operation. the mean pef at baseline was...