BACKGROUND:The power output of the human joints depends on the activation of agonists and antagonist muscles around the joints, and the antagonist muscle is involved in physical activity in a co-activated manner, thereby helping to maintain joint stability. But there are less reports on the central nervous system strategies of antagonist co-activation under different muscle contraction modes. OBJECTIVE:To observe the characteristics and differences of surface electromyography (sEMG) of agonists and antagonist muscles of the knee joints during maximal and submaximal isokinetic exercises until fatigue. METHODS:Sixteen students were enroled, who developed the right knee joint fatigue induced by the Biodex isokinetic equipment, and simultaneously sEMG activities of vastus medialis, vastus lateralis and biceps femoris were recorded by the myoelectrical equipment. The RMS (%) and mean frequency were selected to analyze sEMG characteristics. RESULTS AND CONCLUSION:In the maximal isokinetic fatigue, the peak torque was decreased by 40.3% (P < 0.05) and the sEMG activity of agonists gradualy increased and then declined, but the sEMG activity of antagonists kept constant. In the submaximal isokinetic fatigue, the peak torque was decreased by 40.0% (P < 0.05), the sEMG activity of agonists gradualy increased (P < 0.05), and however the sEMG activity of the antagonists initialy increased and then decreased. The RMS and mean frequency of vastus medialis and lateralis as antagonists at selected reciprocal contractions showed no significant changes (P > 0.05). These results suggest that in the different intensities of isokinetic fatigue, the central nervous system employs different neural strategies on agonists and antagonists.

Objective The morphological changes were observed in a pedigree with May-Hegglin anomaly cells.Methods Blood routine detection of abnormal May-Hegglin family members,peripheral blood cell Wright-Giemsa staining,and obser-vation of the white blood cell and platelet morphology.Made bone marrow smears of the proband,and megakaryocyte counts and classification.The proband peripheral blood leukocyte TEM examination were collected and analyzed by PCR sequen-cing.Results To reduce the May-Hegglin abnormal family blood platelet count in different degree,peripheral blood eosino-phil,eosinophilic inclusion visible form was not an alkaline cells,monocytes,neutrophils in body.Conclusion It’s provided valuable clues to diagnosis of morphological examination for May-Hegglin disorders.

Objective To explore the correlation between Helicobacter pylori (H.pylori) infection and colorectal cancer.Methods From January 2008 to January 2014,263 patients pathologically diagnosed as colorectal cancer were selected as colorectal cancer group,and at the same period 263 patients with normal colon mucosa under colonoscopy were set as control group.The rates of H.pylori infection,the rates of H.pylori infection in patients with different pathological types of colorectal cancer,the rates of H.pylori infection accompanied with atrophic gastritis and the rates of H.pylori infection accompanied with intestinal metaplasia of two groups were retrospectively analyzed.The difference of H.pylori infection between proximal colorectal cancer and distal colorectal cancer was compared.Chi-square test was performed for comparison and odds ratio (OR) value and 95％ confidence interval (CI) were calculated.Results Among 263 patients with colorectal cancer,the H.pylori infection rate of colorectal cancer group was 63.50％ (167/263),which was higher than that of control group (39.54％,104/263),and the difference was statistically significant (x2 =27.66,OR=2.66,95％ CI 1.85 to 3.83,P＜0.01).There was no statistical difference in rates of H.pylori infection among different pathological types of colorectal cancer (x2=0.15,P=0.93).The rate of H.pylori infection accompanied with atrophic gastritis in patients with colorectal cancer was 46.39％ (122/263) which was higher than that of control group (23.57％,62/263),and the difference was statistically significant (x2=28.53,OR=2.94,95％CI 1.98 to 4.36,P＜0.01).The rates of H.pylori infection accompanied with intestinal metaplasia in patients with colorectal cancer was 17.87％ (47/263) which was higher than that of control group (4.18％,11/263),and the difference was statistically significant (x2=23.56,OR=5.50,95％CI 2.76 to 10.95,P＜0.01).There was no significant difference in the rate of H.pylori infection between the proximal colorectal cancer and the distal colorectal cancer (x2 =1.48,P =0.22).Conclusion H.pylori infection,together with atrophic gastritis and intestinal metaplasia caused by it are correlated with colorectal cancer.

Objective To study the expression of BMI-l gene in children with acute leukemia and its clinical significance.Methods The clinical specimens of 46 children with acute leukemia who were diagnosed lately in the Third Affiliated Hospital of Zhengzhou University and other hospitals in Zhengzhou from Jul.1,2008 to Apr.30,2009 were collected,while peripheral blood specimens of 30 healthy children were collected as control group.With the guardians′ informed consent,the experiment was approved through the hospital ethics committee.The level of BMI-1 mRNA′s expression was tested using reverse transcription-polymerase chain reaction(RT-PCR),while data were analyzed through the application of SPSS 12.0 statistical software.Results 1.The level of BMI-l gene′s expression in children with acute leukemia was significantly higher than that in control group(P0.05),after complete remission,BMI-1 mRNA was not detected in the 2 groups;4.Compared with the complete remission group,expression of BMI-1 mRNA in the untreated group and the recurrence group was significantly higher(P0.05).Conclusions BMI-1 gene was highly expressed in children with acute leukemia,and the level of the gene expression in patients of complete remission normalized,which suggests that the gene may be involved in the occurrence and the development process of leukemia;therefore,it is possible to regard the gene as a molecular marker to evaluate the development,relapse and prognosis of the patients with acute leukemia.

AIM: To observe dose-effect relationship of spinal anesthesia with 0.75% ropivacaine in caesarean section.METHODS: According to the dosage of 0.75% ropivacaine,120 full-term and single-birth puerperants were randomly divided into four groups of 30 people each.The dosage of group Ⅰ,Ⅱ,Ⅲ and Ⅳ were 1.5,1.8,2.1 and 2.4 mL respectively.The sensory and motor block of each group within 30 minutes after the injection were observed,and the hemodynamic changes and adverse effects were recorded.RESULTS:(1) Within 30 minutes after the injection,the intermediate zone of pain disappeared highest block level of group I-IV were T10,T8,T6 and T5 respectively.(2) During the period of the first 30 minutes,there were 3 cases in group Ⅲ(10%) and 8 cases in group Ⅳ(27%) appeared chest distress and dyspnea,and the blood pressure of 5 cases in group Ⅲ(17%) and 12 cases in group Ⅳ(40%) dropped to 90 mm Hg(1 mm Hg=0.133 kPa).There were significant difference compared with group IV(P0.05),there were significant difference between group IV and other groups(P

171.1?mol/L) was 25.0%, 37.7% and 46.3%, the percentage of the fulminating hepatitis was 3.0%, 5.9% and 14.0%, and the mean hospital stay days for the convalescent patients were 31.59?18.97, 31.13?13.70 and 37.51?18.33 days, respectively. All these variables were significantly higher in aged group compared with youth and middle-aged groups. The levels of alanine transaminase (ALT) lowered significantly with the advance of age, and they were 1 711.7?1 063.4, 1 423.0?913.2 and 1 162.7?792.5U/L, respectively. The same was true in serum albumin and choline esterase (ChE). On the other hand, the percentage of acute hepatitis without jaundice decreased to 17.9%, 6.4%and 2.5% from the youth to the aged. However, TBIL on admission (131.41?106.97 vs 169.60?136.11 vs 164.36?106.22?mol/L) and the elevation of the peak of TBIL (135.01?109.15 vs 186.08?150.64 vs 209.63?143.74?mol/L) of the middle-aged and the aged were significantly higher than those of the youth. There was no significant difference in the symptoms, the ratio of direct to total bilirubin, mortality to complications among them. Furthermore, the serum IgM and IgG antibodies against HEV were negative in about 8.1% of the patients with HEV. Conclusion With a higher incidence and more severe hepatic damage, the middle-aged and the aged patients need a longer duration for recovery than the young patients.

Objective To probe into the significance and role of double testing of blood for virus markers.Methods The data on the results of routine blood testing at some blood centers in China from July to December,1999 were gathered and analysed.The blood donors with inconsistent results during the double testing were followed up and their blood samples were collected at least half a year later.Nucleic acid amplification testing(NAT) was performed on the samples.Results Only 0.63% of the donors showed inconsistent results during the double testing.Most of the positive results were false positive.Conclusion The double testing currently implemented does not help significantly improve the quality of the blood supply.It is important to enhance blood safety further by improvement of quality of the reagents and introduction of NAT.

Objective To examine the effects of nitroglycerin tolerance on the following myocardial ischemia reperfusion injury (MI/R). Methods Male Sprague-Dawley rats were rardomly subjected to either one of the following treatments: GTN 600 ?g/(kg/h) or saline infusion for 12 h. GTN tolerance was determined with the measurement of mean arterial blood pressure (MABP) and isolated arterial tension. All the GTN-tolerated and the control rats were subjected to 40 min of ischemia followed by 4 h of reperfusion. Myocardial apoptosis (TUNEL analysis), myocardial infarction size (Evans blue-TTC stain), plasma creatine kinase (CK) and lactate dehydrogenase (LDH) activity were determined. Results Nitrate tolerance aggravated MI/R injury as evidenced by increased myocyte apoptosis and infarction size and plasma CK, LDH activity. However, sole GTN tolerance without MI/R injury failed to show any deleterious effect on rat heart. Conclusion GTN tolerance may exert a “potential" deleterious effect on the ischemic hearts.

Three-dimensional virtual surgery experiment is the application of virtual reality technology in the medical field.Doctors use the information in the virtual environment to develop surgical planning,surgical drills.surgical teaching,surgical skills training,to lead the surgical technique and postoperative rehabilitation,and the information is available for surgery every sur-gical member to share.Virtual Surgery experiments combined with the real operation together constitute complete experimental teaching system,making telemedicine experimental teaching methods and teaching content rich and varied.

Objective To explore the changes of indicators for total parenteral nutrition (TPN) and parenteral nutrition (PN) combining enteral nutrition (EN) support in patients with severe acute pancreatitis (SAP), and to analyze the treatment effects of two groups. Methods 29 patients with SAP were randomly divided into two groups: TPN group (n=14) and PN+EN group (n=15). Nonoperative treatment were applied to the two groups. The changes of indicators and therapeutic outcome of two groups were recorded after nutrition support 14 days. Results After 14 days nutritional support, serum albumin (ALB), total serum protein (TSP), blood calcium, glutamic-pyruvic transaminase (ALT), glutamic-oxaloacetic transaminase (AST) in each group increased significantly (P<0.05). While blood glucose, serum amylase, leucocyte count decreased significantly (P<0.05). However, there were no significant difference between two groups except leucocyte count in all laboratory tests. The leucocyte count in the PN+EN group was significantly lower than that in the TPN group (P<0.05). In both group there was no difference found in serum total bilirubin (TB) before and after nutrition support (P>0.05). The APACHE II scores, average hospital days, average hospital charges, incidence of infection and mortality rate in the PN+EN group were significantly lower than that in the TPN group (P<0.05). ConclusionsPN combining EN support was superior to TPN in the treatment of patients with SAP.