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Sociodemographic,biological,and psychosocial correlates of light-and moderate-to-vigorous-intensity physical activity during school time,recesses,and physical education classes

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Journal of Sport and Health Science 2019年第2期8卷 177-182页

作者： Bruno G.G.da Costa Kelly S.da Silva Jaqueline A.da Silva Giseli Minatto luiz R.A.de lima edio l.petroski Research Centre in Physical Activity and Health Federal University of Santa Catarina Department of Physical Education Federal University of Santa Catarina Research Centre in Kineanthropometry and Human Development Federal University of Santa Catarina

Background: Identifying factors associated with physical activity(PA) is useful in planning interventions and policies. The aim of this study was to identify sociodemographic, biological, and psychosocial factors associated with PA performed in school ***: Data collected for the present study included gender, age, socioeconomic status, body fat percentage, aerobic fitness, self-efficacy, attitudes,peer and parental support, and perception of school environment. Dependent variables were light-intensity PA(lPA) and moderate-to-vigorousintensity PA(MVPA) performed during school time, recesses, and physical education(PE) classes. Multiple regression analyses were ***: Participating adolescents(n = 567, 53% female, 12.9 ± 5.3 years) spent 5% of school time in MVPA and 27% in lPA, 15% of recesses in MVPA and 44% in lPA, and 16% of PE classes in MVPA and 41% in lPA. Boys engaged in more MVPA in all categories. Age was inversely related with MVPA and lPA in all periods, whereas body fat percentage was inversely related with MVPA in school time and PE classes. Attitude was inversely related with MVPA in all periods and with lPA in recesses. Considering PA to be good and enjoyable was positively associated with MVPA in school ***: Adolescents spent little time in PA during school. Future interventions should implement enjoyable activities at school.

关键词： Accelerometer Adolescents Attitude Physical education Public health Self-efficacy

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Atrial-selective Inhibition of Sodium Channel Current by Wenxin Keli is Effective in Suppressing Atrial Fibrillation

Atrial-selective Inhibition of Sodium Channel Current by Wen...

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2014中国医师协会中西医结合医师大会

作者： Alexander Burashnikov Alyssa petroski Dan Hu Hector Barajas-Martinez Charles Antzelevitch Masonic Medical Research laboratory

Background—Wenxin Keli is a Chinese herb extract reported to be of benefit in the treatment of cardiac arrhythmias,cardiac inflammation and heart *** and Results—We evaluated the electrophysiologic effects of Wenxin Keli in isolated canine arterially-perfused right atrial preparations with a rim of right ventricular tissue(n = ll).Transmembrane action potentials and a pseudo-electrocardiogram were simultaneously ***(ACh,1 μM) was used to induce atrial fibrillation(AF) and to test the anti-AF potential of Wenxin Keli(5 g/l).Wenxin Keli produced preferential abbreviation of action potential duration(APD90) in atria,but caused atrial-selective prolongation of effective refractory period,due to development of post-repolarization *** maximum rate of rise of the action potential upstroke(Vmax)was preferentially reduced in *** threshold of excitation increased in both atria and ventricles,but much more in *** duration of the "P wave"(index of atrial conduction time)was prolonged to a much greater extent than the duration of the "QRS complex"(index of ventricular conduction time).Wenxin Keli significantly reduced INa and shifted steady-state inactivation to more negative potentials in HEK293 cells stably expressing SCN5 *** Keli prevented induction of persistent AF in 100%atria(6/6)and,in another experimental series was found to terminate persistent ACh-mediated AF in 100%of atria(3/3).Conclusions—Wenxin Keli produces atrial-selective depression of INa-dependent parameters in canine isolated coronary perfused preparations via a unique mechanism and is effective in suppressing AF and preventing its induction,with minimal effects on ventricular electrophysiology.

关键词： Antiarrhythmic drugs atrial fibrillation arrhythmias electrophysiology pharmacology

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小偃麦部分双二倍体及其异附加系异源染色体的GISH分析

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Acta Genetica Sinica 1999年第2期26卷 163-167页

作者：吉万全张学勇 R.Wang R.petroski K.C.Armtrong G.Fedak 陕西省农科院小麦研究中心陕西杨凌712100 中国农业科学院北京100081 美国犹他州立大学加拿大植物研究中心

应用ＴＩＳＨ对小偃麦部分双二倍体ＴＡＦ４６（２ｎ＝８ｘ＝５６）及其衍生的６个二体异附加系的中间偃麦草染色体组种类进行了分析、鉴定。以拟鹅冠草（Ｐｓ．ｓｔｒｉｇｏｓａ）ＤＮＡ为探针的分析结果表明，ＴＡＦ４６所含有的中间... 详细信息

应用ＴＩＳＨ对小偃麦部分双二倍体ＴＡＦ４６（２ｎ＝８ｘ＝５６）及其衍生的６个二体异附加系的中间偃麦草染色体组种类进行了分析、鉴定。以拟鹅冠草（Ｐｓ．ｓｔｒｉｇｏｓａ）ＤＮＡ为探针的分析结果表明，ＴＡＦ４６所含有的中间偃麦草染色体组为合成染色体组，即６条Ｓｔ组染色体和８条Ｅ组染色体。在其衍生的二体异附加系中，Ｌ４和Ｌ７含有Ｓｔ组染色体，Ｌ１、Ｌ２、Ｌ３、Ｌ５含有Ｅ组染色体。ＴＡＦ４６所含有的中间偃麦草染色体的部分同源群依次为ＩＥ（Ｌ３）、２Ｓｔ（Ｌ６）、３Ｅ（Ｌ２）、４Ｓｔ（Ｌ４）、５Ｅ（Ｌ５）、６Ｓｔ（Ｌ７）、７Ｅ（Ｌ１）。

关键词：合成染色体组小偃麦异附加系 GISH

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