摘要
背景:超重和肥胖已成为世界上很多地区严重的公共健康问题。研究表明,在日常生活中做一些小的改变,诸如中断久坐(站立一会),可能有助于缓解久坐带来的健康风险。本研究旨在用人体运动能耗监测仪Acti Graph GT3X检测有久坐习惯的成年人(根据BMI分为相同的体重状况)用于站立(用计数阈值测定)、平躺和坐立(用倾角仪功能测定)的时间。方法:受试者包括22名有久坐习惯的成年人(14名男性,8名女性);平均年龄26.5±4.1岁。所有受试者均完成国际体力活动问卷(IPAQ)的自我报告,以此测定受试之前7天坐立的时间。每天坐立7 h及以上者被选取为受试者,用Acti Graph GT3X的测斜仪功能确定不同姿势。受试者须连续7天(每天24 h)携带加速器。按照BMI将受试者分类:18.5-25 kg/m2为正常,25-30 kg/m2为超重,大于30 kg/m2则为肥胖。结果:正常组(n=10)和超重组(n=6)站立的时间(在对MVPA和磨损时间进行调整后)分别为6.7 h和7.3 h,显著多于肥胖组(n=6,5.5 h);坐立时间(分别为7.1 h和6.9 h)显著少于肥胖组(8.0 h,p<0.001)。正常组和超重组站立及坐立时间均无显著差异(p=0.051,p=0.67)。3组的平躺时间也无显著差异(p=0.55)。结论:本研究描述了有久坐习惯的体重正常、超重、肥胖成年人的站立、坐立以及平躺姿势的分配情况。研究结果为通过增加站立时间防止肥胖的策略提供了新的证据。
Background:Overweight and obesity has become a serious public health problem in many parts of the world.Studies suggest that making small changes in daily activity levels such as"breaking-up"sedentary time(i.e.,standing)may help mitigate the health risks of sedentary behavior.The aim of the present study was to examine time spent in standing(determined by count threshold),lying,and sitting postures(determined by inclinometer function)via the ActiGraph GT3X among sedentary adults with differing weight status based on body mass index(BMI)categories.Methods:Participants included 22 sedentary adults(14 men,8 women;mean age 26.5±4.1 years).All subjects completed the self-report International Physical Activity Questionnaire to determine time spent sitting over the previous 7 days.Participants were included if they spent seven or more hours sitting per day.Postures were determined with the ActiGraph GT3X inclinometer function.Participants were instructed to wear the accelerometer for 7 consecutive days(24 h a day).BMI was categorized as:18.5 to<25 kg/m2as normal,25 to<30 kg/m2as overweight,and≥30 kg/m2as obese.Results:Participants in the normal weight(n=10)and overweight(n=6)groups spent significantly more time standing(after adjustment for moderate-to-vigorous intensity physical activity and wear-time)(6.7 h and 7.3 h respectively)and less time sitting(7.1 h and 6.9 h respectively)than those in obese(n=6)categories(5.5 h and 8.0 h respectively)after adjustment for wear-time(p<0.001).There were no significant differences in standing and sitting time between normal weight and overweight groups(p=0.051 and p=0.670 respectively).Differences were not significant among groups for lying time(p=0.55).Conclusion:This study described postural allocations standing,lying,and sitting among normal weight,overweight,and obese sedentary adults.The results provide additional evidence for the use of increasing standing time in obesity prevention strategies.
