Objective To investigate the effects of 16-week Tai Chi exercise on muscle strength,plantar tactile sensation,kinesthesia,and postural control of older adults at different ages.Methods Thirty-nine older adults were divided into 60-75-year-old group(n=24)and the 76-90-year-old group(n=15),and both groups received Tai Chi practice for 16 weeks.The muscle strength,plantar tactile sensation,kinesthesia,and center of pressure root mean square(CoP-RMS)were measured before and after practice.Results After 16 weeks of Tai Chi exercise,the fifth metatarsal head tactile sensation and ankle dorsiflexion/plantarflexion kinesthesia thresholds decreased in the 76-90-year-old group.However,there was no significant change in the 60-75-year-old group.The CoP-RMS in the medial/lateral direction decreased in the 60-75-year-old and 76-90-year-old group.Conclusions After 16 weeks of Tai Chi exercise,muscle strength,plantar tactile sensation,kinesthesia,and postural control were improved.Especially for older adults aged over 75 years,Tai Chi exercise improved their plantar tactile sensation,kinesthesia,and postural control to a greater extent.Tai Chi practice provides a suitable and effective exercise form for older adults over 75 years.

Objective To investigate the effects of 16-week Tai Chi exercise on muscle strength,plantar tactile sensation,kinesthesia,and postural control of older adults at different ages.Methods Thirty-nine older adults were divided into 60-75-year-old group(n=24)and the 76-90-year-old group(n=15),and both groups received Tai Chi practice for 16 weeks.The muscle strength,plantar tactile sensation,kinesthesia,and center of pressure root mean square(CoP-RMS)were measured before and after practice.Results After 16 weeks of Tai Chi exercise,the fifth metatarsal head tactile sensation and ankle dorsiflexion/plantarflexion kinesthesia thresholds decreased in the 76-90-year-old group.However,there was no significant change in the 60-75-year-old group.The CoP-RMS in the medial/lateral direction decreased in the 60-75-year-old and 76-90-year-old group.Conclusions After 16 weeks of Tai Chi exercise,muscle strength,plantar tactile sensation,kinesthesia,and postural control were improved.Especially for older adults aged over 75 years,Tai Chi exercise improved their plantar tactile sensation,kinesthesia,and postural control to a greater extent.Tai Chi practice provides a suitable and effective exercise form for older adults over 75 years.

Objective To investigate the correlations of computed tomography (CT), clinical, and pathological features in patients with invasive lung adenocarcinoma positive and negative for spread through air spaces (STAS). Methods A total of 236 patients with invasive lung adenocarcinoma confirmed by surgery and pathology were selected, including 118 patients in STAS-positive group and 118 patients in STAS-negative group. The clinical data, CT signs, and pathological features of the two groups were collected and analyzed. Results There was a correlation between age and the occurrence of STAS. The age of the positive group was higher than that of the negative group. Smoking history and family history of tumor had no correlation with the occurrence of STAS. CT features signs such as nodule type and shape, tumor-lung interface, lobulation sign, spiculation sign, vacuole/cavity, air-bronchogram, pleural indentation sign, vascular changes, mean diameter of tumor, mean diameter of solid component, and the percentage of tumor solid components were significantly different between patients with and without STAS. The incidence of STAS in patients with solid nodules and partial solid nodules was significantly higher than that in patients with ground glass nodules. Multivariate analysis showed that the percentage of tumor solid components, air-bronchogram sign, lobulation sign, and tumor-lung interface were independent risk factors for predicting the occurrence of STAS. Conclusion The clinical data and CT signs of patients with invasive lung adenocarcinoma are related to the occurrence of STAS. CT signs such as the percentage of tumor solid components, air-bronchogram, lobulation sign, and tumor-lung interface are of great significance to STAS prediction. Our findings provide an important basis for selection of personalized clinical treatment plans.

BACKGROUND:Satisfactory clinical results have been achieved in the treatment of Sanders Ⅲ calcaneal fractures by percutaneous compression fixation with three-dimensional frame screws.However,whether the stability of minimally invasive plate internal fixation can be achieved in terms of biomechanics,and the advantages and disadvantages after comparison are still unknown. OBJECTIVE:To investigate the fixation effect of different internal fixation devices on Sanders Ⅲ calcaneal fractures by finite element analysis. METHODS:A finite element model of Sanders Ⅲ calcaneal fracture was made based on CT data of a 26-year-old healthy male volunteer.The calcaneal fracture models were fixed by minimally invasive three-dimensional frame screws and minimally invasive Y-plate.The longitudinal loads of 350 and 700 N were applied respectively.The displacement and stress distribution of the two models were analyzed,and the stability of each model was compared. RESULTS AND CONCLUSION:(1)The peak stress of bone block and implant in the minimally invasive three-dimensional frame screw model was significantly lower than that in the minimally invasive minimally invasive plate model.The average stress of bone block and implant in the three-dimensional frame screw model was also significantly lower than that in the minimally invasive plate model.(2)The maximum displacement of the two models was located at the medial side of the articular surface of the posterior talus,and the maximum displacement of the three-dimensional frame screw model was smaller than that of the minimally invasive plate model.(3)The longitudinal displacement between the anterior fragment and the medial fragment of the minimally invasive plate model was smaller,and the transverse and vertical displacement between the medial fragment and the middle fragment of the three-dimensional group screw model was smaller.(4)It is concluded that both of the two internal fixation models can provide satisfactory fixation effect.The three-dimensional frame screw model can provide better transverse and vertical stability with more uniform stress distribution and smaller comprehensive displacement of bone fragments,while the minimally invasive plate has more advantages in maintaining longitudinal stability.

Objective:To discuss the protective effect of carnosine(CAR)against oxygen-glucose deprivation/reoxygenation(OGD/R)-induced astrocyte(AS)injury,and to clarify its possible mechanism.Methods:The AS were divided into control group,model group(OGD/R group),OGD/R+CAR group(CAR group),and OGD/R+CAR+AMP-activated protein kinase(AMPK)activator AICAR group(CAR+AICAR group).MTT assay and green cyanine staining method were used to detect the survival rates and green cyanine staining positive rates of the AS in various groups;Annexin V-FITC/PI method and flow cytometry were used to detect the apoptotic rates of the AS in various groups;Western blotting method was used to detect the expression levels of AMPK,phosphorylated AMPK(p-AMPK),mammalian target of rapamycin(mTOR),phosphorylated mTOR(p-mTOR),microtubule-associated protein light chain 3B(LC3B),Beclin-1,and P62 proteins in the AS in various groups;immunofluorescence staining was used to observe the LC3B positive fluorescence intensities in the AS in various groups.Results:Compared with control group,the survival rate and green cyanine staining positive rate of the AS in OGD/R group were decreased(P＜0.01),the apoptotic rate of the AS was increased(P＜0.01),the ratios of p-AMPK/AMPK and LC3B Ⅱ/LC3B Ⅰ and the expression level of Beclin-1 protein were increased(P＜0.01),and the ratio of p-mTOR/mTOR and the expression level of P62 protein were decreased(P＜0.01).Compared with OGD/R group,the survival rate and green cyanine staining positive rate of the AS in CAR group were increased(P＜0.01),the apoptotic rate of the AS was decreased(P＜0.01),the ratios of p-AMPK/AMPK and LC3B Ⅱ/LC3B Ⅰ and the expression level of Beclin-1 protein were decreased(P＜0.01),and the ratio of p-mTOR/mTOR and the expression level of P62 protein were increased(P＜0.01).Compared with CAR group,the survival rate and green cyanine staining positive rate of the AS in CAR+AICAR group were decreased(P＜0.01),the apoptotic rate of the AS was increased(P＜0.01),the ratios of p-AMPK/AMPK and LC3B Ⅱ/LC3B Ⅰ and the expression level of Beclin-1 protein were increased(P＜0.01),and the ratio of p-mTOR/mTOR and the expression level of P62 protein were decreased(P＜0.01).The LC3B immunofluorescence staining results were consistent with the Western blotting results.Conclusion:CAR has the protective effect on injury of the AS induced by OGD/R,and its molecular mechanism may be related to the inhibition of the AMPK/mTOR signaling pathway,thereby inhibiting autophagy.

Objective To explore the effect of proprioceptive neuromuscular facilitation(PNF)on the knee abduction torque and vastus medialis-medial gastrocnemius(VM-MG)co-contraction index during walking among the old patients with medial compartment knee osteoarthritis. Methods From March to May,2022,32 old patients with medial compartment knee osteoarthritis in communities in Ji'nan were enrolled and randomly allocated to control group(n=16)and training group(n=16).The training group received PNF and the control group received home-based exercise,for six weeks.The knee abduction torque and VM-MG co-contraction index were measured using an infrared motion capture system synchronized with 3D force plate and electromyography system before and after treatment. Results Three cases in the control group and two cases in the training group dropped off.The first and the second peaks of knee abduction torque,and the VM-MG co-contraction index improved in the training group after treatment(|t|>2.460,P<0.05),and the first and the second peaks of knee abduction torque were better in the training group than in the control group(|t|>2.454,P<0.05). Conclusion PNF may optimize the load distribution between the medial and lateral compartments of the knee in patients with knee osteoarthritis.

Objective:To explore the role of SUMOylaiton of peroxisome proliferator-activated receptor γ (PPARγ) in diabetes mellitus prompted inflammation and atherosclerosis in vascular and endothelial cells.Methods:From September 2014 to January 2017, 32 Sprague-Dawley rats in 14 weeks-old were divided into sham operated group, artery injured without diabetes group, artery injured with diabetes group and ubiquitin-conjugating enzyme 9 (UBC9) transfection group (Group D) by random digits table method with 8 rats each. Model of type 1 diabetes mellitus (T1DM) and rat carotid artery balloon injury was made in the assigned group. One rat was excluded because of model failure in each group. Systolic and diastolic common carotid artery diameter and intimal thickness of injured and healthy common carotid artery were evaluated by vascular ultrasound, and the standardized common carotid artery diastolic diameter (sCADD) was calculated. Histological tests and immunohistochemical staining were performed to evaluate intimal hyperplasia, and the ratio of intimal area to media area was calculated when the media area was equal. Human umbilical vein endothelial cells (HUVEC) were cultured 24 h in high glucose medium with different duration and concentration, and the expression levels of interleukin (IL)-8 and IL-1β mRNA were determined by real time reverse transcription polymerase chain reaction (RT-PCR), the expression level of UBC9 was determined by Western blot method, SUMOylation assay kit was used to evaluate SUMOylation of PPARγ. HUVEC was cultured in vitro and PPAR was stimulated by high glucose at different concentrations and different times PPARγ SUMOylation level. UBC9 was overexpressed by lentivirus in vivo and in vitro, and the PPARγ SUMOylation level was detected.Results:The intimal thickness, intimal area and ratio of intimal area to media area 8 weeks after carotid artery injuring in sham operated group, artery injured without diabetes group and artery injured with diabetes group were increased respectively: (0.026 ± 0.018), (0.084 ± 0.007) and (0.264 ± 0.022) mm; (0.18 ± 0.09) × 10 6, (0.32 ± 0.06) × 10 6 and (1.64 ± 0.22)×10 6 μm 2; 0.345 ± 0.073, 0.570 ± 0.080 and 2.710 ± 0.220, the sCADD was decreased respectively: 0.903 ± 0.084, 0.800 ± 0.071 and 0.330 ± 0.036, and there were statistical differences ( F = 10.40, 9.40, 8.20 and 8.60; P<0.05). After HUVEC was cultured in high glucose for 24 h, the IL-8 mRNA at sugar concentrations of 10, 20 and 40 mmol/L was 1.00 ± 0.11, 3.57 ± 0.22 and 4.07 ± 0.40, the IL-1β mRNA was 1.00 ± 0.07, 3.32 ± 0.29 and 5.13 ± 0.19, and there were statistical differences ( F = 73.05 and 205.80, P<0.05). The level of PPARγ SUMOylation and UBC9 in artery injured with diabetes group were significantly lower than those in artery injured without diabetes group (0.46 ± 0.25 vs. 1.00 ± 0.21 and 0.45 ± 0.02 vs. 1.00 ± 0.07), and there were statistical differences ( P<0.05); there was no statistical difference in PPARγ between 2 groups (0.94 ± 0.07 vs. 1.00 ± 0.04, P>0.05). The UBC9 and PPARγ SUMOylation at sugar concentrations of 0, 10, 20 and 40 mmol/L were decreased respectively (0.99 ± 0.05, 0.80 ± 0.06 and 0.62 ± 0.05; 1.00 ± 0.05, 0.57 ± 0.13 and 0.55 ± 0.08), and there were statistical differences ( F = 21.02 and 14.31, P<0.05); there was no statistical difference in PPARγ (1.00 ± 0.03, 0.90 ± 0.04 and 0.91 ± 0.05; F = 3.11, P>0.05). In HUVEC cultured in high glucose medium (20 mmol/L) for 6, 12, 24 and 48 h, the UBC9 and PPARγ SUMOylation were downregulated progressively (1.00 ± 0.09, 0.75 ± 0.05, 0.70 ± 0.08, 0.38 ± 0.04 and 0.35 ± 0.03; 1.00 ± 0.03, 0.86 ± 0.01, 0.59 ± 0.01, 0.51 ± 0.11 and 0.35 ± 0.08), and there were statistical differences ( F = 36.06 and 33.13, P<0.05); but there was no statistical difference in PPARγ (1.00 ± 0.03, 1.14 ± 0.02, 1.18 ± 0.17, 0.98 ± 0.01 and 1.04 ± 0.05; F = 1.90, P>0.05). After overexpression of UBC9 in rats with diabetes, histological analysis showed that UBC9 in artery injured without diabetes group, artery injured with diabetes group and UBC9 transfection group was 1.53 ± 0.18, 1.00 ± 0.22 and 3.62 ± 0.35, there was statistical difference ( F = 5.64, P<0.05). Ultrasonic test results show that in artery injured without diabetes group, artery injured with diabetes group and UBC9 transfection group intimal thickness was increased respectively: (0.077 ± 0.015), (0.216 ± 0.007) and (0.125 ± 0.014) mm, and there was statistical difference ( F = 27.18, P<0.05). Histological analysis showed that intimal area in artery injured without diabetes group, artery injured with diabetes group and UBC9 transfection group was (0.335 ± 0.066) ×10 6, (1.053 ± 0.103) ×10 6 and (0.544 ± 0.040) ×10 6 μm 2, the ratio of intimal area to media area was 0.63 ± 0.063, 2.03 ± 0.052 and 0.93 ± 0.100, there were statistical differences ( F = 13.58 and 53.96, P<0.05). Conclusions:Diabetes mellitus could inhibit the PPARγ SUMOylaiton and prompt inflammation and atherosclerosis in vascular and endothelial cells. Upregulation of PPARγ SUMOylaiton though UBC9 overexpressioncould play a protecting role in diabetes mellitus prompted atherosclerosis.

Objective To explore the value of ¹⁸F-FDG PET/CT in the diagnosis of cholangiocarcinoma. Methods Data were collected from 44 patients with cholangiocarcinoma who underwent PET/CT in Affiliated Cancer Hospital of Shandong First Medical University from September 2017 to October 2020. All patients underwent upper abdominal CT and MRI and whole-body PET/CT. The diagnostic value of three examinations was compared for primary lesions, recurrent lesions, and regional lymph node metastasis of cholangiocarcinoma. Results There were no significant differences in the diagnostic sensitivity of CT, MRI, and PET/CT in the primary lesions and regional lymph node metastasis of cholangiocarcinoma (P > 0.05). There were significant differences in the diagnostic sensitivity of the three examinations for recurrent cholangiocarcinoma lesions (P < 0.05). Conclusion PET/CT has high diagnostic value for recurrent lesions of cholangiocarcinoma, but the three examinations showed no significant differences in the diagnostic sensitivity for primary lesions and regional lymph node metastasis.

Objective To investigate the difference of blood supply in different areas of the normal femoral head in adults.Methods A retrospective study analyzed the DCE-MRI parameters data of 2 5 normal adults (25 right hips)in our hospital.The femoral head was assumed to be a sphere.On T1 WI of DCE-MRI,the right femoral head was divided into three parts equally in coronal,sagittal, and transverse plane respectively.Time to peak(TTP),maximum of enhancement at first past(fEmax),maximum of enhancement (Emax)were measured in three parts and compared in coronal,sagittal and transverse plane respectively.Results (1 )In coronal plane,there were no significant differences between the three parts in TTP,fEmax and Emax.(2 )In transverse plane,fEmax and Emax were lower in the transverse superior zone than that in the transverse central zone significantly (P＝0.024 and P＝0.001)and the transverse inferior zone(P＝0.005 and P＝0.018).TTP was higher in the transverse superior zone than that in the transverse central zone and the transverse inferior zone(P＝0.005 and P＝0.018).(3)In sagittal plane,fEmax and Emax were lower in the sagittal lateral zone than that in the sagittal centralzone (P＝0.019 and P＝0.041)and sagittal medial zone (P＝0.047 and P＝0.01 1).TTP was higher in the sagittal lateral zone than that in the sagittal central zone and the sagittal medial zone(P＝0.014 and P＝0.010).There were no significant differences between other paired zones of the any values.Conclusion DCE-MRI can show the microcirculation in the normal adult femoral head in a non-invasive way.According to DCE-MRI parameters,there are poor perfusions on the transversesuperior and sagittallateral zones of the normal femoral head in adults.

Coronary atherosclerosis (CAS) has been recognized as a chronic inflammatory disease in recent years.As an important component of innate immunity,complement system plays an important role in the pathogenesis of CAS.Multiple components of plaque can activate complement proteins,and the activation of complement promotes the progression of plaque lesions in turn.However,recent studies have also found that some proteins of the complement system may also paly an atheroprotective role in the early stage of atherosclerosis.In addition to the direct effects,complement system is also involved in CAS-related pathological changes.Complement proteins may be promising biomarkers,as confirmed by clinical studies which suggest that circulation levels of some complement proteins can predict the risk and prognosis of CAS.This review mainly introduced the origin and activation of complement molecules inside the plaques,their important roles in the pathogenesis of CAS,and the value of complement molecules as potential predictors in clinical.