Analysis of verification results of protective effects of hearing protectors in different industries / 中华劳动卫生职业病杂志

Objective: To get insight into the current practice of noise reduction effect of workers as they wore hearing protectors in different domestic enterprises and the possible affected factors. Methods: From October 2020 to April 2021, using a random sampling method, 1197 workers exposed to noise in petrochemical factories, textile factories, and parts manufacturing factories were selected as the study subjects. The noise reduction effect of hearing protectors worn by workers in daily use was tested using a hearing protector suitability testing system. The personal sound attenuation level (PAR) was compared among workers in three enterprises, Targeted intervention and repetitive testing were conducted for workers who did not meet the noise reduction effect required by the enterprise, and the changes in PAR of workers before and after the intervention were compared. The comparison of baseline PARs between two or more groups was performed using the Mann Whitney test, the comparison of baseline PARs with post intervention PARs was performed using the Wilcoxon signed rank sum test, and the comparison of qualitative data between two or more groups was performed using the Chi square test. Results: The median baseline PAR for all workers was 15 dB. Men, age<30 years old, education level at or above college level, working experience of 5 to 15 years, and those who used hearing protectors for 5 to 15 years had higher PARs, with statistically significant differences (P<0.05). The median difference in baseline PAR among workers from three enterprises was statistically significant (H=175.06, P<0.01). The median PAR of subjects who did not pass the baseline increased from 3 dB to 21 dB after intervention (Z=-27.92, P<0.01) . Conclusion: Some workers wearing hearing protectors do not meet the required PAR, and low PARs may be related to incorrect wearing methods and incorrect selection of hearing protectors. As a tool for testing, training, and assisting in selection, the hearing protector suitability testing system is of great significance for worker hearing protection.

Biomedicine on hormone mediation of sports in adolescent height development / Biomedicina na mediação hormonal do esporte para desenvolvimento da altura dos adolescentes / Biomedicina en la mediación hormonal del deporte para el desarrollo de la estatura de los adolescentes

ABSTRACT Introduction: Physical exercise is an important factor in regulating energy balance and body composition. Exercise itself is a kind of body stress. It involves the central nervous system, cardiovascular, respiratory, endocrine, and other systems. Sports have various effects on the hormones in adolescent height development. Objective: This article analyzes the effects of different time and load exercise training on the levels of serum testosterone, free testosterone, and cortisol in young athletes. Methods: The athletes' blood samples were collected at the quiet time in the morning before each experiment, immediately after exercise, and at three time intervals the next morning. Then blood testosterone (T), free testosterone (FT), and corticosteroids (C) were measured. Results: One-time and one-day high-volume training can cause a decrease in serum testosterone and free testosterone levels and an increase in cortisol hormones in young athletes. The testosterone level of young athletes rises immediately after exercise. Conclusion: Hormonal changes after physical exercise provide a scientific basis for athlete exercise load prediction and exercise plan formulation. Level of evidence II; Therapeutic studies - investigation of treatment results.

RESUMO Introdução: O exercício físico é um fator importante na regulação do equilíbrio energético e da composição corporal. O exercício em si é um tipo de estresse corporal. Envolve os sistemas nervoso central, cardiovascular, respiratório, endócrino e outros. O esporte tem vários efeitos sobre os hormônios no desenvolvimento da altura do adolescente. Objetivo: Este artigo analisa os efeitos de diferentes tempos e cargas de treinamento sobre os níveis de testosterona sérica, testosterona livre e cortisol em jovens atletas. Métodos: Foram coletadas amostras de sangue dos atletas pela manhã antes de cada experimento, imediatamente depois de exercício e em três intervalos de tempo na manhã seguinte. Em seguida, foram medidos testosterona sérica (T), testosterona livre (FT) e corticosteroides (C). Resultados: O treinamento de alto volume uma vez por dia pode causar diminuição dos níveis de testosterona sérica e livre e aumento do cortisol em jovens atletas. O nível de testosterona de jovens atletas aumenta imediatamente depois do exercício. Conclusões: As mudanças hormonais depois de exercício físico fornecem uma base científica para a previsão da carga dos exercícios e para a formulação do plano de treinamento. Nível de Evidência II; Estudos terapêuticos - Investigação dos resultados do tratamento.

RESUMEN Introducción: El ejercicio físico es un factor importante en la regulación del equilibrio energético y la composición corporal. El propio ejercicio es un tipo de estrés corporal. Afecta a los sistemas nervioso central, cardiovascular, respiratorio y endocrino, entre otros. El deporte tiene varios efectos sobre las hormonas en el desarrollo de la estatura de los adolescentes. Objetivo: Este artículo analiza los efectos de diferentes tiempos y cargas de entrenamiento sobre los niveles de testosterona sérica, testosterona libre y cortisol en jóvenes atletas. Métodos: Se tomaron muestras de sangre de los atletas por la mañana antes de cada experimento, inmediatamente después del ejercicio, y en tres intervalos de tiempo a la mañana siguiente. Luego se midieron la testosterona sérica (T), la testosterona libre (FT) y los corticosteroides (C). Resultados: El entrenamiento de alto volumen una vez al día puede causar una disminución de los niveles de testosterona sérica y libre y un aumento del cortisol en los atletas. El nivel de testosterona de los jóvenes atletas aumenta inmediatamente después del ejercicio. Conclusión: Los cambios hormonales después del ejercicio físico proporcionan una base científica para predecir la carga de ejercicios y formular el plan de entrenamiento. Nivel de Evidencia II; Estudios terapéuticos - Investigación de los resultados del tratamiento.

Status quo of and challenges for research on rust disease in medicinal plants / 中国中药杂志

Medicinal plants are beneficial to human health. However,most of the major producing regions of medicinal plants suffer from rust disease,which threatens the yield and quality of Chinese medicinal materials,thus causes huge economic loss,and hinders the sustainable development of the Chinese medicine industry. By the end of 2020,rust disease had been reported in medicinal plants of 76 species and 33 families. In the 76 species,79 rust pathogens were detected. The majority of these pathogens belonged to Puccinia( 33,39. 24%),Coleosporium( 14,15. 19%),and Aecidium( 11,13. 92%). Of these 79 rust pathogens,10 were autoecious and 13 were heteroecious. Through literature research,this study reviewed the symptoms,pathogen species,severity and distribution,prevalence and occurrence conditions,and control measures of rust disease in medicinal plants,and thereby summarized the research status of rust disease in medicinal plants and the gap with other plants,which is expected to serve as a reference for further research on rust disease in medicinal plants.

Research Status,Problems and Countermeasures of Lyotropic Liquid Crystal in New Drug Delivery Systems of Traditional Chinese Medicine / 中国实验方剂学杂志

Lyotropic liquid crystal is an ordered system with various geometric shapes or three-dimensional structures formed by the interaction of amphiphilic molecules dissolved in polar solvents, and has the characteristics of excellent drug applicability, high drug loading, good bioadhesive property and high transdermal permeability. Through a comprehensive analysis of the research results in this research group and the related research reports of LLC drug delivery system, the authors systematically discussed the research value, development potential and research status of LLC in the field of new drug delivery system of traditional Chinese medicine(TCM), especially in the percutaneous and mucosal drug delivery system and the oral microparticle drug delivery system of TCM. At the same time, due to the current research field of TCM-LLC drug delivery system starts late, many of the basic research problems to be further perfect, this paper had carried on the induction summary to these problems, and put forward the research countermeasures:①the basic research of TCM-LLC drug delivery system should be strengthened by referencing the research experience and methods of LLC drug delivery system of single chemical component combined with TCM characteristics, ②the research on the release mechanism of the chemical components in TCM should be strengthened, and the basic research on the LLC drug delivery system of synchronized sustained release TCM should be carried out, ③development of new LLC materials applicable to TCM, ④the quality evaluation system of TCM-LLC should be improved, ⑤to explore the LLC preparation process suitable for industrialization.

Treatment of humeral shaft fractures in children with closed reduction and external fixation / 中国骨伤

<p><b>OBJECTIVE</b>To explore the clinical effect of closed reduction and minimally invasive treatment of humeral shaft fractures in children.</p><p><b>METHODS</b>From July 2011 to April 2015, 39 cases of pediatric humeral shaft fractures were treated by closed reduction and external fixation, including 27 males and 12 females with a mean age of 8.6 years old ranging from 3 to 14 years old. Time from injury to the treatment was 2 h to 7 days with an average of 2.7 days. There were 6 cases of upper fracture, 21 cases of middle fracture and 12 cases of lower fracture. All children were closed injury, appeared pain, swelling, local deformity and limited mobility and other symptoms after injury. X-ray examination showed humeral shaft fracture. Neer score of shoulder joint function and HSS score of elbow joint function were used to record and analyze the pain, function and activity of shoulder and elbow joint before and after treatment.</p><p><b>RESULTS</b>All the 39 cases were followed up for 6 to 12 months with a mean of 8.6 months. Two cases appeared postoperative superficial infection of the needle, and healed after dress; other cases gained good pinhole healing. There were significant differences in the pain, function and activity of the shoulder of Neer score before and after the treatment (<0.05). There were significant differences in the pain and function of the elbow of HSS before and after treatment (<0.05). According to the evaluation of Neer score of shoulder function, the total score was 88.82±2.50, 29 cases were excellent, 9 cases were good, and 1 case was fair. According to the evaluation of HSS score of elbow joint function evaluation, the total score was 91.51±5.09, 30 cases were excellent, 7 cases were good, 2 cases were general.</p><p><b>CONCLUSIONS</b>Manual closed reduction combined with external fixation for the treatment of humeral shaft fractures in children has advantages of less trauma, definite reduction effect, reliable fixation and benefit for early functional exercise of the shoulder and elbow joint. This therapy can be used as one of clinical methods for the treatment of humeral shaft fractures in children.</p>

Bone setting manipulative reduction for the treatment of children's distal radioulnar fracture and dorsal dislocation / 中国骨伤

<p><b>OBJECTIVE</b>To observe the effect of different manipulative reduction for children's distal radioulnar fracture and dorsal dislocation.</p><p><b>METHODS</b>From June 2013 to June 2014, 80 children with distal radioulnar fracture and dorsal dislocation were treated by bone setting manipulative reduction including 51 males and 29 females with an average age of 6.5 years old ranging from 3 to 14 years old. Time from injury to treatment was 1 h to 6 d, 31 cases were on the right, 49 cases were on the left. Among them, 45 cases were type I of overlapping displacement, 35 cases were type II. The displacement of the fracture was observed by clinical manifestations and X-ray examination. Under fluoroscopy, different techniques were used for reduction and fixation. After 3 weeks of over wrist fixation, the splints were overturned and fixed again for 1 to 2 weeks, then were removed. The wrist joint function was evaluated based on Dienst criteria.</p><p><b>RESULTS</b>Eighty cases of fracture were successfully operated one time, all reached anatomic reduction or near anatomic reduction. Eighty children were followed up for 3 months to 1 year. All the fractures healed, and the healing time was 4 to 5 weeks with an average of 4.6 weeks. All patients removed the splint 3 months later, the results were excellent in 72 cases, good in 7 cases and fair in 1 case, the excellent and good rate was 98.75%.</p><p><b>CONCLUSIONS</b>Bone setting manipulation for children's distal radioulnar fracture and dorsal dislocation can get good reduction. At 1 month after the removal of the splint, wrist function and finger strength gradually recovered and returned to normal after 3 months.</p>

Semicircular decompression for the treatment of old thoracolumbar fractures and intractable neuropathic pain / 中国骨伤

<p><b>OBJECTIVE</b>To investigate the clinical outcomes of semicircular decompression in treating old thoracolumbar fractures and intractable neuropathic pain.</p><p><b>METHODS</b>From September 2009 to September 2013, 21 patients with old thoracolumbar fracture and intractable neuropathic pain were treated with semicircular decompression. Among initial surgery, posterior pedicle screw fixation was used in these patients, with or without laminectomy. All patients were male, range in age from 20 to 28 years old with an average of (25.00±2.38) years. Vertebral body residual bone block resulted in intra-spinal placeholder more than 50%. All patients were complete spinal cord injury (ASIA grade) or cauda equina injury. VAS scores was from 6 to 10 points with the mean of 7.14±0.91. In these patients, MRI, CT, X-rays were performed; denomination and dosage of analgesics were recorded; nerve function and pain status were respectively evaluated by ASIA grade and VAS score before and after operation.</p><p><b>RESULTS</b>All patients were followed up from 8 to 32 months with an average of (17.29±6.02) months. All bone fragments of spinal canal were removed and spinal cord decompressions were achieved. At final follow-up, VAS scores were from 0 to 8 points with an average of (2.43±2.46) points, and were obviously reduced than peroperative data (P<0.05). Eleven cases of them stopped analgesic intake and 7 cases reduced using. Three patients' symptoms and VAS scores were not improved.</p><p><b>CONCLUSION</b>Old thoracolumbar fractures and intractable neuropathic pain need receive imaging examination as soon as possible and consider semicircular decompression therapy if bone fragments were in vertebral canal and spinal canal stenosis existed. This therapy can effectively relieve pain and profit nerve functional recovery.</p>

Establishment of intramedullary spinal cord glioma model in rats / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Treating intramedullary spinal cord gliomas is a big challenge because of limited options, high recurrence rate and poor prognosis. An intramedullary glioma model is prerequisite for testing new treatments. This paper describes the establishment of a rodent intramedullary glioma model and presents functional progression, neuroimaging and histopathological characterization of the tumour model.</p><p><b>METHODS</b>Fischer344 rats (n = 24) were randomized into two groups. Group 1 (n = 16) received a 5 µl intramedullary implantation of 9L gliosarcomal (10⁵) cells. Group 2 (n = 8) received a 5 µl intramedullary injection of Dulbecco's modified Eagle medium. The rats were anesthetized, the spinous process of the T₁₀ vertebra and the ligamentum flavum were removed to expose the T₁₀₋₁₁ intervertebral space and an intramedullary injection was conducted into the spinal cord. The rats were evaluated preoperatively and daily postoperatively for neurological deficits using the Basso, Beattie and Bresnahan scale. High resolution magnetic resonance images were acquired preoperatively and weekly postoperatively. When score equal to 0, rats were sacrificed for histopathological examination.</p><p><b>RESULTS</b>Rats implanted with 9L gliosarcoma cells had a statistically significant median onset of hind limb paraplegia at (16.0 ± 0.4) days, compared with rats in the control group in which neurological deficits were absent. Imaging and pathological cross sections confirmed intramedullary 9L gliosarcoma invading the spinal cord. Rats in the control group showed no significant functional, radiological or histopathological findings of tumour.</p><p><b>CONCLUSIONS</b>Rats implanted with 9L cells regularly develop paraplegia in a reliable and reproducible manner. The progression of neurological deficits, neuroimaging and histopathological characteristics of intramedullary spinal cord gliomas in rats is comparable with the behaviour of infiltrative intramedullary spinal cord gliomas in patients.</p>