Sheng wu yi xue gong cheng xue za zhi = Journal of biomedical engineering = Shengwu yixue gongchengxue zazhi
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Oct 2004
[An analysis system of physical training workload based on Polar Sports Tester].
The polar sports tester made in Finland as one of the most widespread instruments in physical training is of importance for sports training. In this paper, we have developed a set of system for analysis of physical training workload using the measured data of the Polar Sports Tester, and have established a set of analysis indices and reports of the physical training workload, including five categories and 127 quantitative indices. It can reflect the distribution of physical workload and provide a series of parameters for coaches to direct scientific training and raise sport level.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Dec 2002
Review[Radioprotective effects on head and neck tumors of amifostine--a broad-spectrum cytoprotection].
Differentiated thyroid cancer can be effectively treated with high-dose 131I and the other head and neck cancer can also be effectively treated with extra-radiotherapy, but these treatments often result in a reduction in salivary gland function, causing xerostomia. Collectively, these effects can lead to severe secondary complications, including difficulty in speaking and swallowing, decreasing appetite even affecting nutrition and sleep. ⋯ It has been approved by FDA to be used for protecting the salivary gland from xerostomia caused by radiotherapy. It has also show protecting effects on intra-radiotherapy, but there are many problems waiting for study.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Jan 2002
[The changes of cardiovascular response to orthostatic stress caused by hypovolemia induced by weightlessness: a simulation study].
We introduced the method of computer simulation in the studies of gravitational physiology. Based on work of Melchior (1994), we developed a mathematical model that can be used to stimulate cardiovascular responses to orthostatic stress (lower body negative pressure, LBNP). The model includes 7 sub-models: the redistribution of blood, the filling of left ventricle, left ventricle working, peripheral circulation, control of heart rate (HR), control of peripheral resistance and control of venous tone. ⋯ The simulation results indicate that the cardiovascular responses to orthostatic stress change significantly when the decrease of blood volume is more than 15% of the total blood volume. However, if the amount of the decrease of blood volume is less than 5% of the total blood volume, HR and BP could be maintained in normal range by the regulation of baroreflex during LBNP. Our simulation results suggest that hypovolemia may be the main cause of orthostatic intolerance induced by weightlessness.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Sep 2001
[An improved auto-correlation method for Doppler fetal heart rate measurement].
It is very important to monitor the fetal heart rate in the clinical management of pregnancies antenatally. The most commonly employed non-invasive method uses Doppler ultrasound. ⋯ In this paper, we describe an improved method for the determination of fetal heart rate from Doppler ultrasound signals. Using an exponentially weighted auto-correlation technique with an automatic adaptation algorithm, we have developed the method which can provide accurate fetal heart rate records, especially in the cases of reduced signal and loss of signal.
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Sheng Wu Yi Xue Gong Cheng Xue Za Zhi · Jun 2000
Comparative Study[Effect of various assist pumps on recovering the ventricular function].
With the authors' diaphragm pump and pulsatile as well as nonpulastile impeller pumps, and the clinically used Sarns Roller, both left ventricular assist and biventricular assist experiments were performed on mini pigs and calves. The results demonstrate that the pulsatile impeller pump is the best assist pump for recovering the heart function, because it maintains the pulsatility of aortic pressure by heart failure and thus increases the circulation volume, and it enlarges the diastolic pressure so as to increase the perfusion in coronary artery because it has no backflow.