Recent advances of small molecule inhibitors directly targeting HBV / 药学学报

Hepatitis B virus infection is a serious threat to human life and health. The approved anti-HBV drugs including interferons and nucleos(t)ide analogues have serious adverse effect, rebound phenomena after drug withdrawal, and drug resistance. And the cccDNA cannot be completely eliminated by both of them, which is the reason why a complete cure for hepatitis B cannot be achieved. Therefore, developing anti-HBV drugs directly targeting protein or nucleic acid of HBV remains a current public health priority. Based on the analysis of representative literature from the last decade, this article reviews recent developments in small molecule inhibitors directly targeting HBV from a medicinal chemistry perspective.

Advances in research on small molecule regulators targeting HBV cccDNA generation and transcription / 药学学报

Hepatitis B virus (HBV) represents a significant global public health challenge. Despite the availability of several approved drugs for hepatitis B treatment, the persistence of covalently closed circular DNA (cccDNA) renders HBV eradication elusive, thereby leading to disease relapse after drug withdrawal. This paper reviews the regulatory mechanisms of cccDNA formation, transcription and replication, and summarizes the research progress of related small molecule regulators from the perspective of medicinal chemistry.

Oral absorption and effect of macromolecules in traditional Chinese medicine: a new perspective and research mode of phase structure / 中国中药杂志

Protein polypeptides and polysaccharides, the indispensable macromolecular active components in traditional Chinese medicine, are widely found in Chinese medicine decoction after the decoction of traditional Chinese medicine. However, through oral administration, these macromolecules are digested by the stomach and intestine and thus fail to be absorbed in prototype. This is inconsistent with the actual clinical efficacy of Chinese medicine decoction. According to modern research, new phase structures and effects of the macromolecules emerge during the decoction of traditional Chinese medicine, but the phase change law caused by the interaction among the components of traditional Chinese medicine and the relationship between phase structure and effect are still unclear. Thus, this study reviewed the oral absorption of macromolecular components of traditional Chinese medicine, analyzed the internal relationship of the form of macromolecules in traditional Chinese medicine with the absorption and effect based on phase structure, and summarized the research mode of oral absorption and effect of macromolecules in traditional Chinese medicine with phase structures as the core, providing new ideas and methods for future research.

Advances in the study of peptide drugs in oral drug delivery system / 药学学报

Peptide drugs exhibit an irreplaceable role in clinics due to their high specificity, efficiency and low toxicity. At present, more than 80 peptide drugs have been approved for marketing with global sales exceeding $50 billion in 2019. However, with large molecular weights, high hydrophilicity and instability in digestive tract, oral peptide drugs encounter substantial physiological barriers leading to low oral bioavailability. Therefore, peptide drugs are mostly administered by parenteral routes. Although parenteral delivery of peptide drugs achieves high bioavailability, this is associated with inconvenience and discomfort, even causing severe side effects compared with the oral route possessing a high degree of patient compliance. Therefore, numerous studies concentrate on novel strategies to improve the oral bioavailability of peptide drugs. Some delivery technologies such as Eligen™ and Axcess™ have been successfully applied to the oral dosage form of therapeutic peptides and have accelerated relevant oral formulations for Food and Drug Administration (FDA) approval and clinical treatment. In this review, we focus on the oral peptide delivery, mainly summarizing the progress of recent strategies used to overcome oral barriers and the commercialization applications of related patents, which could facilitate the research and development (R&D) of clinical applications of oral delivery techniques for peptide drugs.

Dahuang zhechong pills regulate ASICla/VEGF pathway and alleviate hepatic fibrosis / 中国药理学通报

Aim To examine the therapeutic effects of DHZCP on carbon tetrachloride(CCl4)-induced chemical hepatic fibrosis model in rats and the mechanism of acid-sensitive ion channels 1a(ASIC1a)and vascular endothelial growth factor(VEGF)-related mechanisms.Methods The rats were injected intraperitoneally with CCl4 vegetable oil mixture to establish hepatic fibrosis model,and randomly divided into six groups:control group,hepatic fibrosis model group,DHZCP low dose group,DHZCP medium dose group,DHZCP high dose group and colchicine(Col)positive control group.HE staining was used to observe the pathological changes of hepatic structures in each group,Masson staining to view the production of collagen fibers in each group,and immunohistochemistry,Western blot,q-PCR to investigate the expression level of ASIC1a,CaMKKβ,VEGF,α-SMA,Collagen-I proteins.Results In model group,serum ALT and AST levels were obviously up-regulated,liver tissue structure was severely damaged,and ASIC1a,CaMKKβ,VEGF,α-SMA,Collagen-I gene and protein expression levels were significantly elevated.Compared with model group,each treatment group of DHZCP could markedly alleviate the pathological changes of liver fibrosis caused by CCl4,significantly reduce the serum ALT and AST levels,and dose-dependently down-regulate the gene and protein expression levels of ASIC1a,CaMKKβ,VEGF,α-SMA,Collagen-I,etc.Conclusions DHZCP ameliorates hepatic fibrosis in rats,and its mechanism of action may be associated with the regulation of ASIC1a/VEGF.

Meta-analysis of long-term efficacy of combined regimen in treatment of macular edema secondary to branch retinal vein occlusion / 国际眼科杂志(Guoji Yanke Zazhi)

@#AIM:To evaluate the long-term efficacy and safety of retinal photocoagulation combined with intravitreal injection of Ranibizumab(IVR)and simple Ranibizumab in the treatment of branch retinal vein occlusion secondary macular edema(BRVO-ME).<p>METHODS: The literatures related to randomized controlled clinical studies on the treatment of BRVO-ME with laser and Ranibizumab in Embase, The Cochrane Library, PubMed, China National Knowledge Infrastructure(CNKI), Wanfang Database and China Science and Technology Journal Database(VIP)were systematically retrieved, and the risk assessment was carried out and data indicators were extracted for the included studies. RevMan 5.3 software was used for data analysis and funnel plot was used to evaluate publication bias.<p>RESULTS: Totally 7 studies were included, with 641 eyes. There was no significant difference in the best corrected visual acuity(BCVA)between the laser combined with Ranibizumab group and the simple Ranibizumab group at 12mo \ and 24mo \ after treatment. There was no significant difference in central foveal thickness between the two groups at 12mo \ and 24mo \. There were no statistically significant differences in the injection times of Ranibizumab and the incidence of final adverse events between the two groups at 12mo and 24mo after treatment.<p>CONCLUSION: Compared with the treatment of BRVO-ME with simple Ranibizumab, there was no significant difference in the long-term efficacy of vision and central foveal thickness for the laser combined with Ranibizumab, and there was no significant difference in the injection times and safety of Ranibizumab.

Progress of researches on animal models of Blastocystis hominis infections / 中国血吸虫病防治杂志

Blastocystis hominis is a common parasitic protozoa in human and animal intestines; however, its pathogenicity remains controversial. Construction of animal models is of great significance to investigate the pathogenicity, pathogenic mechanisms and drug screening of B. hominis. Experimental animals, mode of infections, parasite strains and host immune status are important factors affecting the successful modeling of B. hominis infections in animals. Hereby, we review the progress of researches on animal models of B. hominis infections, and summarize the influencing factors and application of animal models of B. hominis infections, in order to provides insights into the selection of animals models of B. hominis infections.

Progress of researches on global prevalence of Blastocystis hominis human infections and its subtypes / 中国血吸虫病防治杂志

Blastocystis hominis is a parasite that parasitizes in the intestines of humans and animals, and is closely related to a variety of gastrointestinal diseases such as abdominal pain and diarrhea. B. hominis is distributed worldwide, and the prevalence of B. hominis infections and dominant subgenotypes vary in countries and in regions from the same country. This paper reviews the global prevalence of B. hominis human infections, its subtypes and geographical distribution, so as to provide insights into the understanding of the global epidemiology of B. hominis and the management of B. hominis infections.

Enhanced water solubility, antioxidant activity, and oral absorption of hesperetin by D-α-tocopheryl polyethylene glycol 1000 succinate and phosphatidylcholine / 浙江大学学报（英文版）（B辑：生物医学和生物技术）

Hesperetin, an abundant bioactive component of citrus fruits, is poorly water-soluble, resulting in low oral bioavailability. We developed new formulations to improve the water solubility, antioxidant activity, and oral absorption of hesperetin. Two nano-based formulations were developed, namely hesperetin-TPGS (D-α-tocopheryl polyethylene glycol 1000 succinate) micelles and hesperetin-phosphatidylcholine (PC) complexes. These two formulations were prepared by a simple technique called solvent dispersion, using US Food and Drug Administration (FDA)-approved excipients for drugs. Differential scanning calorimetry (DSC) and dynamic light scattering (DLS) were used to characterize the formulations' physical properties. Cytotoxicity analysis, cellular antioxidant activity assay, and a pharmacokinetic study were performed to evaluate the biological properties of these two formulations. The final weight ratios of both hesperetin to TPGS and hesperetin to PC were 1:12 based on their water solubility, which increased to 21.5- and 20.7-fold, respectively. The hesperetin-TPGS micelles had a small particle size of 26.19 nm, whereas the hesperetin-PC complexes exhibited a larger particle size of 219.15 nm. In addition, the cellular antioxidant activity assay indicated that both hesperetin-TPGS micelles and hesperetin-PC complexes increased the antioxidant activity of hesperetin to 4.2- and 3.9-fold, respectively. Importantly, the in vivo oral absorption study on rats indicated that the micelles and complexes significantly increased the peak plasma concentration (Cmax) from 2.64 μg/mL to 20.67 and 33.09 μg/mL and also increased the area under the concentration-time curve of hesperetin after oral administration to 16.2- and 18.0-fold, respectively. The micelles and complexes increased the solubility and remarkably improved the in vitro antioxidant activity and in vivo oral absorption of hesperetin, indicating these formulations' potential applications in drugs and healthcare products.

Application value of enhanced recovery after surgery in the radical distal gastrectomy / 中国现代普通外科进展

Objective:To evaluate the safety and feasibility of enhanced recovery after surgery (ERAS) in the Radical Distal Gastrectomy.Methods:The clinical data of 52 patients who underwent radica distal gastrectomy surgery from Jan 2016 to Jan 2017 were collected,and divided into the ERAS group and the control group.Results:(1) Operation condition:the operative time,volume of intraoperative blood loss,number of patients with conversion to open surgery showed no statistically significant difference between the 2 groups (P＞0.05).(2)postoperative clinical indexes:time for initial anus exhaust,time for initial liquid diet intake,time for out-of-bed activity,time of urinary catheter removal,duration of hospital stay of patients without complications days in the ERAS group and days in the control group,respectively,have been with statistically significant differences between the 2 groups(P＜0.05).But the time to initial defecation,time of abdominal drainage-tube removal and the number of postoperative complications during hospitalization between the 2 group had no statistically difference(P＞0.05).(3)Postoperative complications:at the first days and the third days after operation,WBC,CRP and IL-6 in ERAS group were lower than thoese in the control group,the differences were statistically significant.Conclusion:The perioperative ERAS program in distal gastrectomy is safe and effective and should be popularized.

Application of enhanced recovery after surgery in total laparoscopic uncut Roux-en-Y gastrojejunostomy / 中国现代普通外科进展

Objective:To evaluate the safety and feasibility of enhanced recovery after surgery (ERAS) in total laparoscopic Uncut Roux-en-Y gastrojejunostomy after distal gastrectomy.Methods:The clinical data of 42 patients who were divided into ERAS group (n=20) and control group (n=22) were collected.Observation indicators included operation condition,postoperative clinical indexes and postoperative serum stress indexes.Measurement data with normal distribution were presented as-x±s and analyzed by T test.Count data were analyzed by the chi-square test.Results:The operative time,volume of intraoperative blood loss and number of patients with conversion to open surgery shown no statistically significant difference between the 2 groups(P＞0.05).Postoperative clinical indexes:time for initial anus exhaust,time for initial liquid diet intake,time for out-of-bed activity,duration of hoSpital stay of patients without complications in the ERAS group were lower than in the control group,with statistically significant differences between the 2 groups (P＜0.05).But the time to initial defecation,time of abdominal drainage-tube removal and the early postoperative complications between the 2 group had no statistically difference(P＞0.05). Postoperative complications:at the first days and the third days after operation,WBC,CRP and I L-6 in ERAS group were lower than in the control group,the differences were statistically significant (P＜0.05).Conclusion:The perioperative ERAS program in total laparoscopic Uncut Roux-en-Y gastrojejunostomy after distal gastrectomy is safe and effective and should be popularized,meanwhile,it can also reduce duration of hospital stay and improve the comfortable degree and satisfaction of patients.

Experience of LV Hai-jiang in Using Raising Yang Therapy for Treatment of Ophthalmic Diseases / 中国中医药信息杂志

Since Nei Jing, through the development and supplement of ancient physicians, syndrome differentiation of TCM ophthalmology has been gradually improved. To the Jin and Yuan Dynasties, LI Dong-yuan's Pi Wei Lun paid attention to spleen and stomach,which made raising yang therapy has been accepted and widely used in medical subjects. After 40 years of clinical practice and inheritance and innovation of LI Dong-yuan's raising yang therapy, Professor LV Hai-jiang gradually formed his own experience features of using raising yang therapy to treat ophthalmic diseases. Combined with the clinical medical records, this article reviewed diagnosis and treatment experience of Professor LV in using raising yang therapy to treat ophthalmic diseases from the aspects of raising yang and removing obstruction in collaterals, raising yang and dissipating heat, activating blood circulation and expelling stasis, and eliminating dampness and phlegm.

Experience of LV Hai-jiang in Using Raising Yang Therapy for Treatment of Ophthalmic Diseases / 中国中医药信息杂志

Since Nei Jing, through the development and supplement of ancient physicians, syndrome differentiation of TCM ophthalmology has been gradually improved. To the Jin and Yuan Dynasties, LI Dong-yuan's Pi Wei Lun paid attention to spleen and stomach,which made raising yang therapy has been accepted and widely used in medical subjects. After 40 years of clinical practice and inheritance and innovation of LI Dong-yuan's raising yang therapy, Professor LV Hai-jiang gradually formed his own experience features of using raising yang therapy to treat ophthalmic diseases. Combined with the clinical medical records, this article reviewed diagnosis and treatment experience of Professor LV in using raising yang therapy to treat ophthalmic diseases from the aspects of raising yang and removing obstruction in collaterals, raising yang and dissipating heat, activating blood circulation and expelling stasis, and eliminating dampness and phlegm.

Research progress of antipsychotics / 药学学报

Epidemiology indicates that schizophrenia affects approximately 8‰ of the world's population. The atypical (second and third generation) antipsychotics generally endowed with D2/5-HTHT2 receptors antagonism properties are commonly used as first-line drugs for the treatment of schizophrenia presently. They have been proven effective in the treatment of positive and negative symptoms of schizophrenia, but they are largely ineffective in the treatment of cognitive deficit. Moreover, the atypical antipsychotics are usually associated with cardiovascular and metabolic side effects such as QT prolongation and weight gain. To develop more potent antipsychotics with fewer side effects, more targets have been identified such as D3, glutamate, H3 receptors and PDE10A in recent years. Herein, the research progress of antipsychotics is reviewed.

Preparation and quality evaluation of comet-shaped hydroxy camptothecin-loaded amphiphilic block copolymer / 药学学报

In this study, we used Shirasu porous glass membrane (SPG) as a template and hydroxy camptothecin (HCPT) as a model drug to prepare the comet-shaped MePEG[methoxyl poly(ethylene glycol)]-PLGA[poly(lactic-co-glycolic acid)-HCPT amphiphilic block copolymer. Our method was optimized by the orthogonal design method. The partical size, zeta potential, drug-loaded content, yield, shape and status of the obtained comet-shaped MePEG-PLGA-HCPT particles were further characterized by dynamic light scattering (DLS), scanning electron microscopy (SEM)/transmission electron microscopy (TEM), X-ray diffraction (XRD) and differential scanning calorimetry (DSC) et al, respectively. In vitro release was preliminary evaluated. MTT assay to preliminary evaluate the cytotoxicity of particles against human liver BEL-7402 cells. Based on these experimental results, the optimal preparation conditions contain:weight ratio of HCPT to MePEG-PLGA was 1:1, nitrogen pressure was 100 kPa and SPG membrane pore size was 1.1 μm. The particles exhibited a comet-shaped shape, fairly uniform size and were well dispersed. The drug-loading content was 46.2%, with yield of 96.4%, and zeta -31.4 mV. The distribution of HCPT in particles was very uniform, and HCPT showed a amorphous state existed in particles. The release behavior in vitro showed sustained releasing,and with the drug loading content in proportion to the release of the drug. MTT test indicated that the HCPT-loaded comet-shaped particles had enhanced the cytotoxicity against human liver BEL-7402 cells relatively to the HCPT-loaded spherical particles in vitro. The results showed a promising potential application of the preparation in clinical treatment of tumor.

Pathogenicity of Five Strains of Toxoplasma gondii from Different Animals to Chickens

Toxoplasma gondii is a protozoan parasite with a broad range of intermediate hosts. Chickens as important food-producing animals can also serve as intermediate hosts. To date, experimental studies on the pathogenicity of T. gondii in broiler chickens were rarely reported. The objective of the present study was to compare the pathogenicity of 5 different T. gondii strains (RH, CN, JS, CAT2, and CAT3) from various host species origin in 10-day-old chickens. Each group of chickens was infected intraperitoneally with 5 x 10(8), 1 x 10(8), 1 x 10(7), and 1 x 10(6) tachyzoites of the 5 strains, respectively. The negative control group was mockly inoculated with PBS alone. After infection, clinical symptoms and rectal temperatures of all the chickens were checked daily. Dead chickens during acute phage of the infection were checked for T. gondii tachyzoites by microscope, while living cases were checked for T. gondii infection at day 53 post-inoculation (PI) by PCR method. Histopathological sections were used to observe the pathological changes in the dead chickens and the living animals at day 53 PI. No significant differences were found in survival periods, histopathological findings, and clinical symptoms among the chickens infected with the RH, CN, CAT2, and CAT3 strains. Histopathological findings and clinical symptoms of the JS (chicken origin) group were similar to the others. However, average survival times of infected chickens of the JS group inoculated with 5 x 10(8) and 1 x 10(8) tachyzoites were 30.0 and 188.4 hr, respectively, significantly shorter than those of the other 4 mammalian isolates. Chickens exposed to 10(8) of T. gondii tachyzoites and higher showed acute signs of toxoplasmosis, and the lesions were relatively more severe than those exposed to lower doses. The results indicated that the pathogenicity of JS strain was comparatively stronger to the chicken, and the pathogenicity was dose-dependent.

Association between abdominal obesity and blood pressure among 7 to 10 years old Chinese children / 中华预防医学杂志

<p><b>OBJECTIVE</b>To analyze the association between abdominal obesity and blood pressure among 7-10 years old Chinese children.</p><p><b>METHODS</b>A total of 40 495 children aged 7-10 years with complete height, weight, waist circumference and blood pressure data were chosen from the data of 2010 Chinese National Survey on Students Constitution and Health. Based on the "Reference Norms for Screening Overweight and Obesity in Chinese Children and Adolescents" developed by Working Group Obesity in China (WGOC) and the waist to height ratio reference value for children (WHtR ≤ 0.46) , the children were divided into 4 body types (normal weight, simple abdominal obesity, combined obesity and other types). High blood pressure was defined as the systolic blood pressure (SBP) and/or diastolic blood pressure (DBP) higher than the P 95 blood pressure value of 2010 national student of the same gender and age. The prevalence of simple abdominal obesity, combined obesity and high blood pressure were described. Three groups (with 2165 children in each) of children with normal weight, simple abdominal obesity, combined obesity respectively were selected from the chosen ones matched by gender, age (within ± 0.5 years old) and height (within ± 0.3 cm) at the ratio of 1: 1: 1. The value of blood pressure and prevalence of high blood pressure were described.χ(2) test, analysis of variance and multilevel models were used to analyze the relationship between obesity and blood pressure.</p><p><b>RESULTS</b>A total of 40 475 children were selected from the database, including 20 175 boys and 20 320 girls. The prevalence of simple abdominal obesity was 6.36% (2576/40 495), the prevalence of boys and girls was 7.41% (1494/20 175) and 5.32% (1082/20 320) respectively. The prevalence of combined obesity was 16.33% (6611/40 495), the prevalence of boys and girls was 21.30% (4298/20 175) and 11.38% (2313/20 320) respectively. There were statistical differences in the body type distribution of both boys and girls (χ(2) = 869.01, P < 0.01). The prevalence of high blood pressure was 9.62% (3896/40 495), the prevalence of boys (10.05% (2028/20 175)) was higher than girls (9.19% (1868/20 320)) (χ(2) = 8.59, P < 0.01). The value of SBP and DBP among combined obesity group (boys: (103.8 ± 11.3), (64.7 ± 10.1) mm Hg (1 mm Hg = 0.133 kPa); girls: (102.9 ± 12.1), (64.5 ± 10.0) mm Hg) > simple abdominal obesity group (boys: (99.5 ± 11.2), (61.6 ± 9.9) mm Hg; girls: (99.6 ± 11.4), (62.6 ± 9.3) mm Hg)> normal weight group (boys: (97.4 ± 10.8), (60.5 ± 9.4) mm Hg; girls: (97.2 ± 10.8), (60.8 ± 9.4) mm Hg), and the differences were statistical significant (Fboys: 113.22, 62.05; Fgirls: 54.19, 32.31, P < 0.01). According to the results of multilevel model, among boys, compared with the normal weight group, the SBP of combined obesity group and simple abdominal obesity group was 6.0 and 1.8 mm Hg higher respectively (Wald χ(2): 17.55, 204.94, P < 0.01); the DBP was 4.0 and 0.9 mm Hg higher respectively (Wald χ(2): 6.37, 114.05, P < 0.05). Among girls, the SBP was 5.0 and 2.1 mm Hg higher respectively (Wald χ(2):16.47, 92.52, P < 0.01); the DBP was 3.5 and 1.6 mm Hg higher respectively (Wald χ(2): 12.29, 57.52, P < 0.01). Comparing with normal group, the risk of high SBP among boys with simple abdominal obesity was higher (OR = 1.48; 95%CI: 1.06-2.06), and both the boys (SBP: OR = 3.06; 95%CI: 2.28-4.11) ; DBP: OR = 2.72; 95%CI: 1.99-3.72) and girls (SBP: OR = 2.48; 95%CI: 1.75-3.53; DBP: OR = 2.64; 95%CI: 1.82-3.93) in combined obesity group had a higher risk of high SBP and high DBP.</p><p><b>CONCLUSION</b>Simple abdominal obesity is associated with the increasing of blood pressure in children, and combined obesity has a closer ties than simple abdominal obesity.</p>

Association between physical development and spermatorrhea during puberty among boys aged 11 to 15 years in China / 中华预防医学杂志

<p><b>OBJECTIVE</b>To explore the association between spermatorrhea and physical development during puberty for boys aged 11 to 15 years old in China.</p><p><b>METHODS</b>The height, weight, chest circumference, waist circumference, hip circumference and the station of spermatorrhea of boys aged 11-15 years old were selected from the data of 2010 National Survey on Students Constitution and Health. Body mass index (BMI) and waist to height ratio were calculated. After 1: 1 random matching in every 0.1 year of age, 6880 boys (3440 with spermatorrhea and 3440 without spermatorrhea) were included in our study. t-test was used to analyze differences in anthropometry measurements between boys with spermatorrhea and boys without spermatorrhea in each age group. Multilevel model was used to analyze the relationship between anthropometry measurements and spermatorrhea.</p><p><b>RESULTS</b>A total of 6880 boys were put in this research. Heights of boys with spermatorrhea aged 11 to 15 years old were (150.96 ± 8.01), (159.46 ± 8.03), (163.76 ± 7.43), (167.03 ± 7.12) and (169.50 ± 6.64) cm, respectively, while heights of boys without spermatorrhea aged 11 to 15 were (147.38 ± 6.54), (153.55 ± 8.68), (160.35 ± 8.66), (164.44 ± 7.98) and (167.98 ± 7.80) cm, respectively. The differences were significant (t values were 3.70, 9.96, 10.76, 8.26, and 3.21 respectively with all P values < 0.01).</p><p><b>RESULTS</b>of multilevel analysis showed that the differences of weight were the largest from 11 to 13 years old, boys with spermatorrhea having a 4.20, 7.23 and 3.93 kg (Waldχ(2) values were 13.11, 70.73 and 72.93 respectively, all P values < 0.01) larger weight than boys without spermatorrhea, respectively. Differences of height were the largest from 14 to 15 years old, boys with spermatorrhea having a 2.81 and 1.99 cm (Waldχ(2) values were 87.80 and 19.54, P < 0.01) larger height than boys without spermatorrhea. The trends of the differences between boys with spermatorrhea and boys without spermatorrhea (β value) with age were parabolic on weight, BMI, height, chest circumference, waist circumference, hip circumference and waist to height ratio. The β values reached maximum at 12 years old, which were 7.23 kg, 1.64 kg/m(2), 5.55 cm, 4.40 cm, 4.63 cm, 4.94 cm, and 0.015, respectively. The β values reached minimum at 15 years old, which were -0.39 kg, -0.56 kg/m(2), 1.99 cm, -0.57 cm, -1.59 cm, -0.42 cm and -0.015, respectively.</p><p><b>CONCLUSION</b>There is an association between spermatorrhea and physical development among boys aged 11 to 15 years in China , which has a parabolic trend with age.</p>

Analysis of influencing factors on physical endurance of Chinese primary and middle school students aged 10 to 17 / 中华预防医学杂志

<p><b>OBJECTIVE</b>To explore the influencing factors on physical endurance among Chinese primary and middle school students aged 10-17.</p><p><b>METHODS</b>Data was used from "2010 National Physical Fitness and Health Surveillance", from which 68 458 primary and middle school students with complete information were selected. Good physical endurance was defined as endurance running time ≤ P 25 of same gender and age, poor physical endurance as ≥ P 75 of same gender and age. Difference of endurance running time in different physical endurance groups was compared; chi-square test, logistic regression and multiple level model were used to analyze influence of region, BMI, diet, exercise and exercise willingness on physical endurance.</p><p><b>RESULTS</b>There were 34 293 (50.0%) students of good physical endurance and 34 219 (50.0%) ones of poor physical endurance in 68 458 subjects. Percentage of good physical endurance was 53.8% (18 285/33 996) in rural students, higher than urban ones (46.3% (15 954/34 462)) (χ(2) = 384.16, P < 0.01). Percentage of good physical endurance was 12.2% (448/3660) in obese students, lower than normal (55.2% (28 183/51 028)), overweight (29.3% (2012/6874)) and emaciated ones (52.1% (3596/6896)) (χ(2) = 3840.08, P < 0.01). Percentage of good physical endurance was 52.5% (25 534/48 679) in students having breakfast everyday, higher than ones never having breakfast or 1-2 times per week (41.3% (3209/7768))(χ(2) = 438.31, P < 0.01). Percentage of good physical endurance was 51.7% (11 580/22 379) in students having milk everyday, slightly higher than ones never or sometimes having milk (49.2% (22 659/46 079)) (χ(2) = 39.84, P < 0.01). Percentage of good physical endurance was 55.3% (18 961/34 314) in students with adequate physical education class, higher than ones with inadequate class (44.7% (15 278/34 144)) (χ(2) = 756.41, P < 0.01). Percentage of good physical endurance was 58.6% (9484/16 195) in students with one hour exercise or more per day, higher than ones with less than one hour exercise (47.4% (24 755/52 263)) (χ(2) = 619.82, P < 0.01). Percentage of good physical endurance was 60.1% (19 287/32 118) in students who were "very willing" to take part in endurance running, higher than "generally willing" ones (45.4% (10 569/23 272)) and "not willing" ones (33.5% (4383/13 068)) (χ(2) = 2909.61, P < 0.01). Multiple level analysis revealed that risk of poor physical endurance was lower in rural students (OR = 0.80, 95%CI: 0.77-0.82) than urban ones. Risk in emaciated students (OR = 1.11, 95%CI: 1.05-1.17), overweight students (OR = 2.69, 95%CI: 2.55-2.85) and obese students (OR = 7.71, 95%CI: 6.97-8.52) was higher than normal ones. Concerning diet, risk of poor physical endurance in students never having breakfast or once to twice per week was highest (OR = 1.20, 95%CI: 1.13-1.26), followed by students having breakfast three to five times per week (OR = 1.13, 95%CI: 1.08-1.18); risk in students having one bag of milk per day was higher (OR = 1.09, 95%CI: 1.02-1.17) than ones having two bags. Concerning exercise, risk of poor physical endurance in students with inadequate physical education class (OR = 1.20, 95%CI: 1.13-1.26) and less than one hour exercise per day (OR = 1.34, 95%CI: 1.29-1.40) was higher than ones with adequate physical education class and one hour exercise or more respectively. Risk of poor physical endurance in students who were "generally willing" (OR = 1.67, 95%CI: 1.61-1.73) and "not willing" (OR = 2.72, 95%CI: 2.60-2.85) to take part in endurance running was higher than "very willing" ones.</p><p><b>CONCLUSION</b>Urban and rural residence, BMI, breakfast, milk, physical education class, exercise time and exercise willingness were related to primary and middle school students'physical endurance.</p>

Association between early menarche and physical fitness among adolescent girls in China / 中华预防医学杂志

<p><b>OBJECTIVE</b>To explore the association between early menarche and physical fitness among adolescent girls in China.</p><p><b>METHODS</b>Research material was selected from the data of "2010 National Physical Fitness and Health Survey". Probability unit regression method was used to calculate the age of 10th percentile at menarche and menarche age before the 10th percentile was defined as early menarche(9.0-11.6 years old). A total of 1072 girls with early menarche were selected. Each girl with early menarche was matched with one girl from the same urban or rural locations who hadn't achieved menarche with the age difference less than 0.1 years. A total of 1072 girls without menarche were selected. Indicators of physical fitness included 50 m running, standing broad jump, 50 m×8 shuttle running and sit-ups. Differences of physical fitness between early menarche and without menarche were analyzed using t test stratified by age and urban/rural area. The multilevel models of single dependent variable and multiple dependent variables were used to analyze association between early menarche and physical fitness.</p><p><b>RESULTS</b>A total of 2144 students were put in this research. Among girls (11.0-11.6 years old) in urban areas, 50 m running, standing broad jump and sit-ups was (9.78 ± 0.85) s, (153.81 ± 18.59) cm, and 27.79 ± 10.25, respectively for those with early menarche, while in girls without menarche was (10.01 ± 0.90) s, (149.71 ± 18.72) cm and 26.28 ± 10.11, respectively. There were significant differences between two groups on all above variables (t values were 4.02, 3.43 and 2.31, respectively with all P values <0.01). Among girls in rural, 50 m×8 shuttle-running and sit-ups was (125.22 ± 15.57) s and 24.96 ± 8.97 for those with early menarche, while it was (120.92 ± 13.06) s and 22.96 ± 9.83 for those without menarche. There were significant differences between two groups on both variables(t values were 3.89 and 2.77 with both P values < 0.01). In addition, 50 m×8 shuttle-running in girls (10.0-10.9 years old) with early menarche was (128.52 ± 15.74) s and it was (123.89 ± 13.50) s in girls without menarche. The difference was significant (t = 2.14, P < 0.05). The multilevel analysis showed that 50 m running, standing broad jump and sit-ups in girls with early menarche was 0.12 s, 3.14 cm and 1.11 higher than girls without menarche (Waldχ(2) values were 4.00, 6.22 and 4.07, respectively with all P values < 0.05). But 50 m×8 shuttle-running in girls with early menarche was 1.95 s less than girls without menarche (Waldχ(2) = 3.96, P < 0.05).</p><p><b>CONCLUSION</b>Early menarche may be associated with higher speed fitness, leg power and muscle power and lower physical stamina.</p>