Objective To obtain the frequency weighting contour for seated Chinese young males in z axis.Method 10 male volunteers served as the subjects.They were exposed to standard vibration stimulus (a sinusoidal vibration of 1.0 m/s2 at 8 Hz) and 14 kinds of sinusoidal experimental vibration stimuli at frequencies from 4 Hz to 80 Hz.The magnitude of the experimental vibration stimulus was changed by the subject through a signal condition and switching device made by ourselves to obtain an equal vibration sensation to the standard vibration.The data were fitted to the same form of the frequency weighting Wk of ISO 2631-1 with the least square method and optimization of parameters.Result Compared with ISO 2631-1,the frequencies weightings of Chinese young males at 16～80 Hz are significantly higher than those of ISO 2631-1(P<0.005),but there are no significant difference between two frequency weighting contours at other frequencies. Conclusion Chinese young males are more sensitive to vibration at 16～80 Hz in Z axis.

Objective: To study the protective effects and the mechanism of Salvia yunnanensis extract on hypoxia/reoxygenation injury in cultured rat H9c2 cardiomyocytes.Methods: The hypoxia/reoxygen (H/R) injury model was established in H9c2 cell strain with or without the extract of Salvia yunnanensis.The cultured H9c2 cardiomyocytes were randomly divided into 6 groups: the normal control (C) group, H/R group, H/R+verapamil (H/R+V) group, H/R+Salvia yunnanensis extract at low dose (H/R+L, 0.01 mg·L-1) group, medium dose (H/R+M, 0.1 mg·L-1) group and high dose (H/R+H, 1.0 mg·L-1) group.The cell viability was measured by MTT assay and the activity of malondialdehyde (MDA) and lactate dehydrogenase (LDH) was measured by a detection kit.Fluorescence absorbance (A) value was measured by a fluoroscopy to show the intracellular reactive oxygen species (ROS) levels.Results: Compared with that in the model group, the survival rate of myocardial cells was significantly higher in Salvia yunnanensis extract at low, medium and high dose groups (P＜0.05 or P＜0.01), and the intracellular LDH leakage (P＜0.05 or P＜0.01), the content of MDA in cytoplasm (P＜0.01) and the intracellular ROS levels significantly decreased in Salvia yunnanensis extract at high dose group (P＜0.05).Conclusion: The extract of Salvia yunnanensis has protective effect on hypoxia/reoxygenation injury in cultured rat H9c2 cardiomyocytes, and the mechanism may be related to the reduction of lipid peroxides and removal of cell oxygen free radicals.

Objective To compare the treatment effects of gastric bypass (GBP) and biliopancrtic diversion (BPD) in non-insulin dependent diabetes mellitus rats,and investigate the mechanism.Methods Forty GK rats with diabetes mellitus were randomly allocated into four groups:GBP group; BPD group; food restriction group ( FR group) and control group with 10 rats in each group.Rats in GBP group and BPD group received GBP and BPD procedures respectively.Rats in FR group were fed with basic feed of 15 g and free access to water.There was no food restriction in rats in control group.The operation time,mortality was recorded.The fasting body weight was measured every week.The plasma glucose,insulin-like growth factor-1 (IGF-1),and leptin concentrations,were measured before treatment and 1,2,3,4,8,16 week after treatment.Results The mean operation time was (25 ± 4) min in GBP group and (35 ± 6) min in BPD group; one rat died in GBP group and 3 rats died in BPD group,and the difference between the two groups was statistically significant (P ＜ 0.01 ).The levels of plasma glucose,IGF-1 and leptin were not statistically significant among these groups before treatment.There was no significant difference in plasma glucose and leptin concentrations in the control group.The levels of plasma glucose and leptin in rats in FR group began to decrease 2 weeks later,at the 4th week,the levels of plasma glucose and leptin was significantly lower than that before treatment,and it lasted for the 16 th week,but the level of IGF-1 were significantly different.The levels of plasma glucose and leptin in rats in GBP group and BPD group began to decrease and IGF-1 began to increase 2 weeks after operation,and it lasted for the 16th week,[plasma glucose:(6.8 ± 1.0),(6.3 ± 0.8 ) mmol/L vs.(13.9±2.6),(14.1 ±2.6)mmol/L; leptin:(16.1±3.3),(17.2±3.2)pg/ml vs.(29.4±3.9)pg/ml,(29.4±3.9); IGF-1:(166.1±8.3),(142.2±8.2)ng/L vs.(119.4±8.8),(109.8±7.9)ng/L,P＜0.01],but the levels of plasma glucose and leptin was not statistically different between the two groups.The level of IGF-1 in GBP group was significantly higher than that in BPD group (P ＜ 0.05).Conclusions Both GBP and BPD can effectively control plasma glucose concentration for rats with diabetes.The possible mechanism is related to decreased leptin and increased IGF-1.Group GBP had a better outcome in operation time,mortality and increasing IGF-1 than those in group BPD.

Objective To investigate the strategy to improve successful treatment for severe acute pancreatitis (SAP). Methods The study period was divided into from 1992 to 2000, and from 2001 to 2009.The patients during these two phases were comparable as regard to sex and age. Results The proportion of patients received anti-inflammatory medications from 2001 to 2009 was 88.7% (94/106), medications which can improve the pancreatic microcirculation were used in 93.4% (99/106), early enteral nutrition was used in 58.5% (62/106), medications which can protect intestinal barrier function were used in 98.1% ( 104/106),all these parameters were significantly higher than those (22.4%, 19/85; 43.5%, 37/85; 29.4%, 25/85;17.7%,15/85) from 1992 to 2000. Also from 1992 to 2000, more patients underwent operation such as basin-shaped open drainage, pancreatic necrosis debridement. While more patients underwent operation such as laparoscopic drainage, CT or B-ultrasound guided percutaneous drainage from 2001 to 2009. The proportion of patients underwent surgical treatment decreased from 56.5% (48/85) to 32. 1%(34/106); the survival rate increased from 68.8% to 84.0%. Conclusions The research progress of medications was the foundation to improve successful treatment for SAP. Operation was an important option during SAP therapy. The individualized treatment was beneficial to improve successful treatment for SAP.

Objective To investigate the change in quality of life (QoL) following laparoscopic Roux-en-Y gastric bypass (LRYGB) for T2DM with obesity.Methods A total of 46 overweight T2DM cases (mean baseline BMI (32.7 ± 3.9) kg/m2) undergoing LRYGB were followed by QoL questionnaires (SF-36) before and after 6 and 12 months.Results The preoperative physical QoL scales (physical component summary,PCS) was significantly different from the general population(GP) scales (P ＜ 0.01),and the improvement in QoL was significant at 6 months postoperative and continued to consistently increase up to 12 months (P ＜ 0.01).For mental component summary (MCS),the preoperative scales was not significantly different from the GP scales,however,the 6 and 12 postoperative scales improved significantly (P ＜0.01).As for physical function,role physical,role emotion,the 6 (78 ± 8,76 ± 17,70 ± 23) and 12 months' (85 ± 7,82 ± 18,77 ± 18) postoperative scales were markedly higher than those in the preoperative controls (P ＜ 0.01),and there were no differences between the 12 month's postoperative scales and GP scales.The preoperative bodily pain,general health and social function (66 ± 14,55 ± 12,63 ±15) was different when compared with (76 ± 12,75 ±6,75 ± 13) at 6 months and (82 ±9,79 ±6,94 ±9) at 12 months (P ＜0.01).The preopertive mental health (71 ± 12) was not significantly different from GP scales,nor there were significant difference when compared with (71 ± 10) at 6 months and (73 ±8) at 12 months.Conclusions There were improvements in physical and mental QoL in T2DM patients with obesity after LRYGB.

Objective To observe the impact of laparoscopic Roux-en-Y gastric bypass on bowel habits in patients with type 2 diabetes mellitus(T2DM).Methods 70 cases of T2DM undergoing laparoscopic Roux-en-Y gastric bypass were studied.Changes in bowel habits, frequency and odor of flatulence, and social life were estimated at least 6 months after surgery using a self-administered questionnaire.Results 67.1%of the patients had normal bowel habit, 68.6%of patients maintained normal flatus before undergoing surgery, and visual ana-logue scale reveals bowel and flatus habit would cause little trouble on daily life.47.1% of patients maintained their normal bowel habit, and 45.7%of patients had loose stools and diarrhea after surgery.The number of pa-tients with loose stools significantly increased(28/70, 40% after surgery vs 5/70, 7.1% before surgery), with statistical difference( P<0.001) .42.9%patients believed that eating high-fat diet was related with loose stools (P<0.001).Patients with constipation decreased significantly after surgery(5/70, 7.1% vs the preoperative 16/70, 22.9%), with statistical difference(P=0.016).Visual analogue scale showed that 57.1% of patients thought their daily life and social activities were not affected(P=0.05).50%of patients considered an increase flatus, and 55.7%had malodorous flatus, which had statistical significance compared with those before surgery ( P<0.001) .A visual analogue scale showed that 60%of patients thought that this change would not affect their daily life and social activities( P=0.212) .Conclusions After laparoscopic Roux-en-Y gastric bypass surgery, some patients had loose stod, diarrhea, increased flatus and and offensive odor, but after proper treatment these changes do not affect their daily life and social activities.

Objective:To investigate the effect and mechanism of non-selective histone deacetylase (HDAC) inhibitor sodium butyrate (NaB) on neuropathic pain and pain-induced memory impairment in mice.Methods:Forty clean grade male C57BL/6J mice were were divided into 4 groups by random number table method ( n=10 in each group): sham + saline, sham + NaB, chronic constriction injury (CCI)+ saline and CCI + NaB.The mouse CCI model was established by sciatic nerve ligation. Non-selective HDAC inhibitors NaB(300 mg/kg) was intraperitoneally injected into the mice in Sham+ NaB group and CCI+ NaB group once a day 15-28 days after modeling, while the mice in Sham+ saline group and CCI+ saline group were intraperitoneally injected with the same volume of saline. On the 14th and 28th day after operation, the athletic ability was measured by open field test (OFT), the pain behavior was measured by paw withdrawal threshold (PWT) and paw withdrawal latency (PWL), and the memory function was measured by Y-maze. After the behavioral experiment, hippocampus and spinal dorsal horn tissues were taken for the activity of HDAC measurement, and hippocampus tissues were taken for the expression levels of BDNF and PSD95 measurement. SPSS 25.0 software was used for statistical analysis. The data were compared by repeated measurement ANOVA and one-way ANOVA. Results:After treatment with NaB, the interaction effects of the accuracy of spontaneous alternation of PWT, PWL and Y maze in mice were significant( F=21.07, 6.98, 7.79, all P<0.05). Compared with the Sham + saline group, the PWT((0.83±0.30)g, (0.25±0.22)g, (0.24±0.11)g; both P<0.05), the PWL((14.97±4.02)s, (5.99±1.51)s, (6.87±0.90)s; both P<0.05) and the spontaneous alternation in Y maze(71.57±2.80)%, (56.96±0.60)%, (62.86±4.94)%; both P<0.05) in CCI+ Saline group and CCI+ NaB group were lower. After treatment with NaB, compared with CCI + saline group, PWT((0.22±0.13)g, (0.62±0.23)g; P<0.05), PWL((5.62±2.00)s, (8.82±2.13)s; P<0.05)and the accuracy of spontaneous alternation of Y maze were significantly higher ((56.54±7.50)%, (66.35±8.20)%; P<0.05), the HDAC activity in hippocampus((173.40±7.38)%, (122.70±8.40)%; P<0.05)and in spinal cord ((153.40±10.58)%, (111.40±11.40)%; P<0.05)were significantly lower, and the expression of BDNF((0.65±0.06), (0.87±0.43); P<0.05)and PSD95((0.70±0.40), (0.87±0.04); P<0.05)were significantly higher in CCI + NaB group. Conclusion:NaB can improve neuropathic pain and pain-induced memory impairment.The mechanism may be related to the inhibition of HDAC activity and the up-regulation of BDNF and PSD95 expression in hippocampus.