Cross-sectional analysis of levels and patterns of objectively measured sedentary time in adolescent females.
Cross-sectional analysis of levels and patterns of objectively measured sedentary time in adolescent females.
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DOI：
10.1186/1479-5868-8-120
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发表时间：
2011-10-28
期刊：
影响因子：
--
通讯作者：
Donnelly AE
中科院分区：
文献类型：
--
作者：
Harrington DM;Dowd KP;Bourke AK;Donnelly AE
青少年女性是一个特别久坐的人群，久坐的生活方式可能产生的负面影响正在被发现。然而，过去的久坐研究大多是基于自我报告或使用间接方法来量化久坐时间。青少年女性久坐不动的总时间和可能的复杂久坐模式还没有使用客观和直接的身体倾斜测量来描述。本文的目的是使用ActivPAL™检查一组青少年女性的久坐水平和模式，并强调在一周内和上学日内久坐水平和模式的可能差异。还介绍了如何分析数据的完整方法描述。从爱尔兰共和国的城市和农村地区招募了111名15-18岁的青少年女性。参与者佩戴ActivPAL身体活动监测仪7.5天。ActivPAL每15秒直接报告坐/躺的总时间，并使用定制的MATLAB®计算机软件程序检查久坐活动的累积（频率和持续时间）。虽然在工作日和周末之间，在24小时内坐/躺的总时间没有显著差异（18.8 vs. 18.9小时; p = 0.911），但与周末相比，工作日积累的1至5分钟和21至40分钟的久坐时间明显更多（p <0.001）。每次久坐的平均时间也更长（9.8对8.8分钟; p <0.001）。当比较上学时间（上午9点到下午3点）和放学后时间（下午4点到晚上10点）时，久坐的总时间没有差异（3.9小时; p = 0.796），但久坐时间的积累模式不同。在上学时间内，持续时间> 20分钟的发作次数多于放学后（4.7对3.5次发作; p <0.001），而放学后的时间包括较短的发作< 20分钟。学校被强调为青春期女性特别久坐的环境。在检查这一人群的久坐模式和行为时，应鼓励采取干预措施，减少在学校的久坐时间，并使用可穿戴设备区分姿势。
Adolescent females have been highlighted as a particularly sedentary population and the possible negative effects of a sedentary lifestyle are being uncovered. However, much of the past sedentary research is based on self-report or uses indirect methods to quantity sedentary time. Total time spent sedentary and the possible intricate sedentary patterns of adolescent females have not been described using objective and direct measure of body inclination. The objectives of this article are to examine the sedentary levels and patterns of a group of adolescent females using the ActivPAL™ and to highlight possible differences in sedentary levels and patterns across the week and within the school day. A full methodological description of how the data was analyzed is also presented. One hundred and eleven adolescent females, age 15-18 yrs, were recruited from urban and rural areas in the Republic of Ireland. Participants wore an ActivPAL physical activity monitor for a 7.5 day period. The ActivPAL directly reports total time spent sitting/lying every 15 seconds and accumulation (frequency and duration) of sedentary activity was examined using a customized MATLAB® computer software programme. While no significant difference was found in the total time spent sitting/lying over the full 24 hour day between weekday and weekend day (18.8 vs. 18.9 hours; p = .911), significantly more sedentary bouts of 1 to 5 minutes and 21 to 40 minutes in duration were accumulated on weekdays compared to weekend days (p < .001). The mean length of each sedentary bout was also longer (9.8 vs. 8.8 minutes; p < .001). When school hours (9 am-3 pm) and after school hours (4 pm-10 pm) were compared, there was no difference in total time spent sedentary (3.9 hours; p = .796) but the pattern of accumulation of the sedentary time differed. There were a greater number of bouts of > 20 minutes duration during school hours than after school hours (4.7 vs. 3.5 bouts; p < .001) while after school time consisted of shorter bouts < 20 minutes. School is highlighted as a particularly sedentary setting for adolescent females. Interventions to decrease sedentary time at school and the use of wearable devices which distinguish posture should be encouraged when examining sedentary patterns and behaviors in this population.
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