Background: The lip trill is a semi-occluded vocal tract exercise found to have positive outcomes on vocal parameters of healthy individuals after a single session. However, the effect of several lip trill sessions has not been studied. Objective: This study investigated the effect of a 3- to 4-week lip trill exercise program on Maximum Phonation Time (MPT), Maximum Phonation Frequency Range (MPFR), Harmonics-to-Noise Ratio (HNR), and mean Speaking Fundamental Frequency (mean SFF). Methods: Three vocally untrained healthy females with perceptually normal voices participated in a multiple-baseline, single-case experimental research. Five to seven direct training sessions were randomly assigned. Self-implementation was encouraged thereafter. Participants were assessed on all outcome measures for 15 sessions. Data were visualized and inspected. Cohen’s d was also derived using Standardized Mean Difference for single-subject research. Results: Visual and statistical analyses revealed a decreased MPT when training was introduced, increased MPFR variability during the training phase, and increased stability in mean SFF post-training. Perceived effects include vocal freedom, decreased laryngeal stress, and vocal conditioning. Vocal outcomes in one participant yielded a significant effect on MPFR and mean SFF and a small effect on HNR. Conclusion There is evidence of lip trill effect on pitch control and vocal conditioning. Findings also revealed that motivation, exercise frequency, and adherence could contribute to positive gains in vocally healthy speakers. Further investigation in consideration of the study findings and limitations is warranted.
prevention

No abstract available.
Primary Prevention*

Atrial Fibrillation ; prevention & control ; Humans ; Primary Prevention

Data research from 1997-2004, restrospective and cross-sectional studies were conducted every 6 months from 4/2002-4/2004 to collect data on malaria patients and the rate of malaria parasite and follow up the sectoral development of Anopheles and An. minimus at areas where interruption of vector prevention at different times: 1, 2 or 3 years showed that indicators like malaria patients, malaria patients/1000 residents and the density of malaria parasite were decreasing and stable. An.minimus recovers and increase with time. The density at 2-3 years after spraying was higher than the density at the point of spraying. An.minimus presented at all sites of the study but the density in striking people was low. If the supervision, management and treatment of malaria patients are well, the malaria situation could be kept stable even vector control methods were not used often
Malaria ; Prevention & control

This paper introduced the frequent cancers in Vietnam, the situation of the cancer prevention and control in Hanoi, especially the activities of the department of tumor of Hai Ba Trung hospital during past 10 years (1988-1999), concurrently establish the orientation, objectives of cancer prevention and control program in Hanoi from now to 2000.
neoplasms ; prevention & control

From 1994 up to now, active measures in the prevention of cholera have been implementing in Thua Thien Hue province, by the proper investment for safe water supplying, waste treatment, sewage treatment, sanitary-food safety examination and control of chloride content in safe water system, close supervise and soon discovery of patients with cholera, quick and strict responding to the epidemic so that limiting and decreasing significantly the mortality.
Cholera ; prevention & control

Some algorithms used in UV-Vis MCA spectrophotometry technique and some recent statistical approaches to the Advanced MCA technique were described. A number of pharmaceutical formulas containing 2-4 ingredients has been analyzed successfully using MCA technique. Basing on the basic algorithm of MCA and its statistical approaches, an applicable software for data processing had been established (running in Windows (environment - IBM compatible computer). This enables to use MCA technique for conventional spectrophotometers.
Pharmaceutical Preparations ; prevention & control

A cross-sectional study was carried out with 539 subjects at Khanh Hoa and Binh Thuan provinces. The results: there was 180 occupational accident during the period from 1997 to 1999, with 31 deaths. Almost of them have not been appropriately trained in diving technique and safety measures. They have not enough protection equipment, diving clothes and oxygen-tubes when diving at 20m depth. Training courses on diving safety measures for fishermen were conducted and recommendations for treatments of diving-fishermen diseases were made. These recommendations have been applied in Ham Tan Hospital (Binh Thuan).
Accidents, Occupational ; prevention & control

The mortality rate due to rabies/100.000 inhabitants in Viet Nam was 0,43 during 1991-1995, was the highest mortality among 10 epidemic infectious diseases. From 1996-2000, some active interventive solutions had been implemented such as establishing the steering committee for rabies control; strengthening the role of the authority and co-ordination of ministries and sectors, promoting propaganda, education, training and building the special network; enhancing the quality of treatment and prevention for people who had been beaten by mad animals and suspected mad animals. As a result during 1996-2000 the mortality caused by bites of mad animals throughout the country reduced by more than 65% compared with 1991-1995. In some key provinces the mortality cause by bites of mad animals decreased 80-95%
Rabies ; Prevention & control

1,763,616 victims were bitten by mad suspected dogs in Southern provinces during 5 years had been vaccineated, in which 148 victims died (0.08%). Ben Tre province had the highest victims and the highest mortality rate, while Ca Mau province was at the lowest. Especially there was no death by rabies in Binh Duong and Soc Trang provinces. There was an insignificant difference between male and female victims. The age over 15 was 61%; 91.47% had vaccineated before 15 days of bites and 80.71% bitten by dogs; 78% were mild bites, far from nervous centre. The victims died due to rabies decreased 50% in 2000 compared with this in 1996
Rabies ; Prevention & control