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Objective:To explore the differences of static and dynamic spontaneous brain activity between male smoking addicts and healthy controls, and analyze the mechanism of smoking addiction.Methods:Based on static amplitude of low-frequency fluctuation (sALFF) and dynamic amplitude of low frequency fluctuation (dALFF), the differences of static and dynamic spontaneous brain activity were compared between male smoking addicts ( n=63) and healthy controls ( n=30) by independent sample t-test. Pearson correlation analysis was used to investigate the relationships between the altered dALFF values and score of Fagerstr?m test for nicotine dependence(FTND) and pack-years of smoking addicted males. Results:Compared with healthy controls, the values of sALFF in the left superior/middle/inferior orbitofrontal gyrus ( t=5.17, clusters≥108) were increased and the variation of dALFF in the right superior temporal/middle gyrus, left orbitofrontal region, left orbital superior/middle/inferior frontal gyrus, right orbitofrontal gyrus/middle/inferior frontal gyrus and right putamen ( t=4.90, 4.37, 4.91, 4.62, 4.59, clusters≥96) were also increased in the smoking addicted group. It was noteworthy that the dALFF values of the right superior temporal/middle gyrus( r=0.252, P=0.047), left orbital region superior frontal gyrus( r=0.281, P=0.026) and right putamen( r=0.313, P=0.012) were positively correlated with pack-years of male smoking addicts. Conclusion:Male smoking addicts may have abnormal static and dynamics spontaneous neural activity in prefrontal cortex (including orbital frontal lobe), putamen and superior temporal/middle gyrus, which are correlated with pack-years.
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Objective To understand the current situation of scientific exercise literacy of middle school students,including basic knowledge,attitude,skills and exercise habits.Methods One middle school was selected from each of Shulan county in Jilin province,Wuxi city in Jiangsu province and Chengdu city in Sichuan province,including two junior high schools and one senior high school.Two classes were randomly selected in each grade from each of the three schools.All students in the selected classes took part in the study.1 360 questionnaires were distributed and all were collected,1 355 of them were qualified questionnaires.The questionnaire contains knowledge (12 items),attitudes (10 items),skills (1 items) and habits (3 items).The one who correctly answered 80％ or more of the questions was considered as having the competent literacy.Results Among middle school students,27.4％ had the scientific exercise literacy,47.5％ had the knowledge literacy and 49.0％ had the attitudes literacy for scientific exercise.68.8％ reported regular exercise,but only 12.5％ had exercise habits.Conclusion The level of scientific exercise literacy among middle school students is low,suggesting that multiple measures should be taken to improve scientific exercising knowledge and concept among middle school students,helping them to develop a scientific exercising habit and improve their literacy of scientific exercising.
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Objective:To analyze the association between obesity and age at spermarche among Chinese Han boys aged 11-18 years . Methods:The height, weight and status of the spermarche of Chinese Han boys aged 11-18 years were selected from the data of 2010 National Physical Fitness and Health Surveil-lance. The body mass index ( BMI) , prevalence of spermarche in each age group and ages at spermarche by BMI groups were calculated. Chi square test was used to analyze the differences of prevalences of spermarche among the boys with different BMIs across ages. U-test was used to compare the differences of age at spermarche between the boys who were obese and not. Results:In the boys aged 12 and 17 years in urban areas and boys aged 13 years in rural areas, the differences of prevalences of spermarche among the normal weight, overweight and obesity groups were significant (P<0. 05). The age at spermarche in the obesity group (13. 90 years) was 0. 1 years earlier than that in the non-obesity group (14. 00 years) (P<0. 05). Conclusion:Obesity may make the age at spermarche ahead of time.