Objective To investigate the effects of strength training and flexibility training on the strategy of crossing obstacles for the elderly women and the risk of tripping over obstacles.Methods Twenty five elderly women were randomly divided into strength training group(n=13)and flexibility training group(n=12),and received corresponding intervention training for 12 weeks.The kinematics data of obstacle crossing were collected using an infrared three-dimensional(3D)motion capture system before and after training.Results Both strength training and flexibility training could significantly improve the gait speed(P=0.033),stride length(P=0.020)and toe distance(P=0.014)during 25 cm obstacle crossing.The interactive effect of training and time was significant for the crossing height(15 cm:P=0.025;25 cm:P=0.019).The interactive effect of training and time was significant for the margin of stability(MOS)in the internal-external direction during 25 cm obstacle crossing(P<0.05).The minimum MOS in the first single support period(P=0.046)and the MOS at the time when the toe crossed directly above the obstacle(P=0.043)in strength training group were significantly increased.Conclusions Both strength training and flexibility training can improve the spatiotemporal characteristics of the elderly women during obstacle crossing.Compared with flexibility,muscle strength is the most important reason that restricts the crossing height of the elderly women.Strength training can effectively reduce the risk of tripping over obstacles by improving the crossing height and dynamic stability of elderly women.

Objective To investigate the effects of strength training and flexibility training on the strategy of crossing obstacles for the elderly women and the risk of tripping over obstacles.Methods Twenty five elderly women were randomly divided into strength training group(n=13)and flexibility training group(n=12),and received corresponding intervention training for 12 weeks.The kinematics data of obstacle crossing were collected using an infrared three-dimensional(3D)motion capture system before and after training.Results Both strength training and flexibility training could significantly improve the gait speed(P=0.033),stride length(P=0.020)and toe distance(P=0.014)during 25 cm obstacle crossing.The interactive effect of training and time was significant for the crossing height(15 cm:P=0.025;25 cm:P=0.019).The interactive effect of training and time was significant for the margin of stability(MOS)in the internal-external direction during 25 cm obstacle crossing(P<0.05).The minimum MOS in the first single support period(P=0.046)and the MOS at the time when the toe crossed directly above the obstacle(P=0.043)in strength training group were significantly increased.Conclusions Both strength training and flexibility training can improve the spatiotemporal characteristics of the elderly women during obstacle crossing.Compared with flexibility,muscle strength is the most important reason that restricts the crossing height of the elderly women.Strength training can effectively reduce the risk of tripping over obstacles by improving the crossing height and dynamic stability of elderly women.

Objective To investigate the effects of an adeno-associated virus(AAV2)vector expressing secretory transforming growth factor-β(TGF-β)type Ⅱ receptor(sTβRⅡ)extracellular domain-IgG2a Fc fusion protein(sTβRⅡ-Fc)on proliferation and migration of triple-negative murine breast cancer 4T1 cells in mice.Methods The pAAV-sTβRⅡ-Fc vector expressing sTβRⅡ-Fc fusion protein constructed by molecular cloning,the capsid protein-expressing vector pAAV2 and the helper vector were co-transfected into HEK 293T cells to prepare the recombinant AAV2-sTβRⅡ virus,which was purified by density gradient centrifugation with iodixanol.Western blotting was used to examine the effects of AAV-sTβRⅡ virus on Smad2/3 phosphorylation in 4T1 cells and on expression levels of E-cadherin,vimentin and p-Smad2/3 in 4T1 cell xenografts in mice.BALB/c mice bearing subcutaneous xenografts of luciferase-expressing 4T1 cells received intravenous injections of AAV-sTβRⅡ virus,AAV-GFP virus or PBS(n=6)through the tail vein,and the proliferation and migration of 4T1 cells were analyzed with in vivo imaging.Ki67 expression in the tumor tissues and sTβRⅡ protein expressions in mouse livers were detected with immunohistochemistry and immunofluorescence staining,and tumor metastases in the vital organs were examined with HE staining.Results The recombinant pAAV-sTβRⅡ-Fc vector successfully expressed sTβRⅡ in HEK 293T cells.Infection with AAV2-sTβRⅡ virus significantly reduced TGF-β1-induced Smad2/3 phosphorylation in 4T1 cells and effectively inhibited proliferation and lung metastasis of 4T1 xenografts in mice(P<0.05).In the tumor-bearing mice,intravenous injection of AAV-sTβRⅡ virus significantly increased E-cadherin expression,reduced vimentin and Ki67 protein expressions and Smad2/3 phosphorylation level in the tumor tissues(P<0.05 or 0.01),and induced liver-specific sTβRⅡ expression without causing body weight loss or heart,liver,spleen or kidney pathologies.Conclusion The recombinant AVV2 vector encoding sTβRⅡ extracellular domain is capable of blocking the TGF-β signaling pathway to inhibit the proliferation and lung metastasis of 4T1 cells in mice.

Objective To calculate the nonlinear features of motion in patients with chronic vestibular syndrome(CVS)using the largest Lyapunov exponent(LLE),and to verify the classification model's validity through machine learning algorithms.Methods A three-dimensional(3D)motion capture system was used to capture the joint motion trajectories of the subjects,which were determined using the LLE.The features of the chaotic trajectories were calculated as the input,and seven classifiers,namely the ID3 decision tree,Adaboost,C45 decision tree,Bayesian classification,Naive Bayes,and support vector machine,were used for classification.Results A total of 17 sets of trajectories from 16 joints were in the chaotic state,and the average energy,enhanced wavelength,and kurtosis of the motion trajectories in the experimental group showed significant differences(P<0.05).The ID3 decision tree classifier showed optimal performance with 100%prediction accuracy,recall,and F1-score.Conclusions Chaotic features may contain high personality differences in patients with CVS and can improve the accuracy of machine learning algorithms for recognition.These findings provide a reference for early identification and motor rehabilitation of patients with CVS.

Objective To investigate the effects of an adeno-associated virus(AAV2)vector expressing secretory transforming growth factor-β(TGF-β)type Ⅱ receptor(sTβRⅡ)extracellular domain-IgG2a Fc fusion protein(sTβRⅡ-Fc)on proliferation and migration of triple-negative murine breast cancer 4T1 cells in mice.Methods The pAAV-sTβRⅡ-Fc vector expressing sTβRⅡ-Fc fusion protein constructed by molecular cloning,the capsid protein-expressing vector pAAV2 and the helper vector were co-transfected into HEK 293T cells to prepare the recombinant AAV2-sTβRⅡ virus,which was purified by density gradient centrifugation with iodixanol.Western blotting was used to examine the effects of AAV-sTβRⅡ virus on Smad2/3 phosphorylation in 4T1 cells and on expression levels of E-cadherin,vimentin and p-Smad2/3 in 4T1 cell xenografts in mice.BALB/c mice bearing subcutaneous xenografts of luciferase-expressing 4T1 cells received intravenous injections of AAV-sTβRⅡ virus,AAV-GFP virus or PBS(n=6)through the tail vein,and the proliferation and migration of 4T1 cells were analyzed with in vivo imaging.Ki67 expression in the tumor tissues and sTβRⅡ protein expressions in mouse livers were detected with immunohistochemistry and immunofluorescence staining,and tumor metastases in the vital organs were examined with HE staining.Results The recombinant pAAV-sTβRⅡ-Fc vector successfully expressed sTβRⅡ in HEK 293T cells.Infection with AAV2-sTβRⅡ virus significantly reduced TGF-β1-induced Smad2/3 phosphorylation in 4T1 cells and effectively inhibited proliferation and lung metastasis of 4T1 xenografts in mice(P<0.05).In the tumor-bearing mice,intravenous injection of AAV-sTβRⅡ virus significantly increased E-cadherin expression,reduced vimentin and Ki67 protein expressions and Smad2/3 phosphorylation level in the tumor tissues(P<0.05 or 0.01),and induced liver-specific sTβRⅡ expression without causing body weight loss or heart,liver,spleen or kidney pathologies.Conclusion The recombinant AVV2 vector encoding sTβRⅡ extracellular domain is capable of blocking the TGF-β signaling pathway to inhibit the proliferation and lung metastasis of 4T1 cells in mice.

A comparison of the volatile compounds in Rhizomes Curcumae (Ezhu) and Radix Curcumae (Yujin) was undertaken using gas chromatography-mass spectrometry (GC-MS).Ultrasonic extraction and GC-MS methods were developed for the simultaneous determination of five sesquiterpenes,namely,α-pinene,β-elemene,curcumol,germacrone and curdione,in Ezhu and Yunjin.Good linearity (r＞0.999) and high inter-day precision were observed over the investigated concentration ranges.The validated method was successfully used for the simultaneous determination of five sesquiterpenes in Ezhu and Yujin.The quantitative method can be effectively used to evaluate and monitor the quality of Chinese curcuma in clinical use.