Adaptive treadmill walking encourages persistent propulsion

BackgroundAdaptive treadmills allow real-time changes in walking speed by responding to changes in step length, propulsion, or position on the treadmill. The stride-to-stride variability, or persistence, of stride time during overground, fixed-speed, and adaptive treadmill walking has been studied, but persistence of propulsion during adaptive treadmill walking remains unknown. Because increased propulsion is often a goal of post-stroke rehabilitation, knowledge of the stride-to-stride variability may aid rehabilitation protocol design.Research questionHow do spatiotemporal and propulsive gait variables vary from stride to stride during adaptive treadmill walking, and how do they compare to fixed-speed treadmill walking?MethodsEighteen young healthy subjects walked on an instrumented split-belt treadmill in the adaptive and fixed-speed modes for 10 minutes at their comfortable speed. Kinetic data was collected from the treadmill. Detrended fluctuation analysis was applied to the time series data. Shapiro-Wilk tests assessed normality and one-way repeated measures ANOVAs compared between adaptive, fixed-speed, and randomly shuffled conditions at a Bonferroni-corrected significance level of 0.0055.ResultsStride time, stride length, step length, and braking impulse were persistent (α > 0.5) in the adaptive and fixed-speed conditions. Adaptive and fixed-speed were different from each other. Stride speed was persistent in the adaptive condition and anti-persistent (α < 0.5) in the fixed-speed condition. Peak propulsive force, peak braking force, and propulsive impulse were persistent in the adaptive condition but not the fixed-speed condition (α ≈ 0.5). Net impulse was non-persistent in the adaptive and fixed-speed conditions. All variables were non-persistent in the shuffled condition.SignificanceDuring adaptive treadmill walking, increases in propulsive force and impulse persist for multiple strides. Persistence was stronger on the adaptive treadmill, where increased propulsion translates into increased walking speed. For post-stroke gait rehabilitation where increasing propulsion and speed are goals, the stronger persistence of adaptive treadmill walking may be beneficial.     

脑出血继发损伤中沉默信息调节因子2的表达和炎症反应*

目的：探讨脑出血对酵母沉默信息调节因子2（Sirt2）和炎症的影响。方法：将胶原酶Ⅳ注入SD大鼠右侧 纹状体中建立脑出血模型，通过免疫印迹和ELISA 等方法测定大鼠脑出血后48 h 的Sirt2 的表达及炎症变化。利 用Hemin 诱导PC12 细胞损伤模拟体外脑出血模型，并检测Sirt2 及炎症变化；采用短发夹RNA（shRNA）-Sirt2 沉 默Sirt2 在PC12 细胞中的表达及对炎症的影响。结果：手术后48 h 脑出血行为学评分最低。脑出血组Sirt2 的表达 显著高于假手术组。脑出血组IL-6、IL-1β 表达显著升高。结论：脑出血可以促进Sirt2 的表达和炎症反应，降低 Sirt2 的表达可减缓炎症反应。 关键词 脑出血；沉默信息调节     

稳定性冠心病血瘀证的血浆定量蛋白质组学探析＊

目的 基于数据非依赖性采集的定量蛋白质组学技术（data independent acquisition，DIA）对稳定性冠心病血瘀证患者的血浆蛋白质进行研究分析，初步探索冠心病血瘀证的关键生物学过程与核心靶点。方法 选择中国中医科学院广安门医院心血管科收治的5例稳定性冠心病患者作为疾病观察组，同时选取健康成人5人作为对照组，采用DIA蛋白质组学技术对受试者的血浆进行检测，确定蛋白质表达量后进行差异蛋白质表达分析、GO富集分析、KEGG信号通路图查询和蛋白质互作网络分析。结果 在差异倍数为1.5倍时，疾病观察组相比于健康对照组，共鉴定到22个蛋白质下调，9个蛋白质上调。进一步的生物信息学分析表明，冠心病血瘀证的生物学过程与补体参与的慢性炎症反应有关，关键信号通路是补体与凝血级联反应的信号通路，核心蛋白质为C反应蛋白、转甲状腺素蛋白、补体因子H、维生素D结合蛋白等。结论 冠心病血瘀证的生物学过程与补体参与的慢性炎症反应有关。     

胰腺切除患者围术期血糖管理的最佳证据总结

背景血糖紊乱是胰腺切除患者围术期常见问题。然而，目前国内开展的胰腺切除患者围术期血糖管理实践多以经验为指导，缺乏循证依据。目的总结胰腺切除患者围术期血糖管理的最佳证据。方法系统检索BMJ最佳临床实践、Up to Date、国际指南协作组、国际糖尿病联盟（IDF）、世界卫生组织（WHO）、美国国立指南数据库（NGC）、美国糖尿病协会、英国国家临床优化研究所（NICE）、新西兰指南研究组、加拿大糖尿病协会、澳大利亚糖尿病协会、苏格兰校际指南网络（SIGN）、PubMed、Web of Science、EMBase、CINHAL数据库、Cochrane图书馆、乔安娜布里格斯研究所（JBI）循证卫生保健中心、医脉通、万方数据知识服务平台、中国知网（CNKI）、生物医学数据库（CBM），筛选关于胰腺切除患者围术期血糖管理的文献。检索时间为建库至2020年12月。指南的质量评价采用国际AGREE协作组织2009年更新的AGREE Ⅱ量表。专家共识的质量评价采用澳大利亚JBI循证卫生保健中心专家共识评价标准2017版。随机对照试验的评价采用Jadad评分量表。结果通过初步检索筛选出文献6 637篇，最终纳入文献13篇，其中7篇为临床实践指南，4篇为专家共识，2篇为随机对照试验。评价结果显示，7篇临床实践指南中3篇总体质量评价为A级，剩下4篇为B级；4篇专家共识的质量评价在"观点与其他文献不一致的地方是否有合理解释？"条目的评价结果为"不清楚"，其余条目的评价结果均为"是"。2篇随机对照试验均为高质量文献。共汇总了62条最佳证据，主要涉及围术期组织管理、入院评估及处理、血糖控制目标、血糖监测、术前血糖管理策略、术中血糖管理策略、术后血糖管理策略、危急状况处理以及出院指导9个方面。结论临床医务人员应根据总结的9个方面最佳证据（包括围术期组织管理、入院评估及处理、血糖控制目标、血糖监测、术前血糖管理策略、术中血糖管理策略、术后血糖管理策略、危急状况处理以及出院指导）为胰腺切除患者制定个体化、全程化的围术期血糖管理方案。     

Abnormal glucose tolerance in a pediatric cystic fibrosis cohort: Trends in clinical outcomes and associated factors in the preceding years

Background and aimsDeterioration of anthropometric and lung function parameters was shown to precede the onset of cystic fibrosis-related diabetes (CFRD) in adults. In children, studies have been conducted in small cohorts with relatively short observation period. Study objectives were to document the longitudinal trends of anthropometric, pulmonary, nutritional and metabolic parameters from cystic fibrosis (CF) diagnosis to the ascertainment of abnormal glucose tolerance and identify parameters associated with the incidence of such abnormalities in a pediatric CF cohort.Methods and resultsRetrospective cohort study of 281 children with CF. Longitudinal trends of anthropometric, lung function, nutritional and metabolic data were generated from CF diagnosis to the ascertainment of abnormal glucose tolerance defined as the presence of either impaired glucose tolerance (IGT), unconfirmed CFRD or CFRD. Cox models and Kaplan–Meier curves were used to identify factors associated with developing abnormal glucose tolerance.Forty-five percent of cohort had normal glucose tolerance (NGT), 27% IGT, 10% unconfirmed CFRD and 18% CFRD. Children who developed CFRD displayed lower height z-scores from a very early age. Conversely, HbA1c levels began to rise closer to CFRD ascertainment. Height z-scores (HR: 0.45; CI 95% [0.29–0.69]) and HbA1c (HR: 2.43; CI 95% [1.86–3.18]) in years preceding ascertainment were associated with the risk of developing CFRD.ConclusionChildren who developed CFRD display distinctive trends for height z-scores from a very early age, whereas HbA1c appears as a marker of established glucose metabolism derangements.