使用手机预示着成为“活跃的沙发土豆”：对足够活跃的大学生进行的横断面调查结果
Cell phone use predicts being an "active couch potato": results from a cross-sectional survey of sufficiently active college students.
作者信息
Lepp Andrew, Barkley Jacob E
机构信息
College of Education, Health and Human Services, Kent State University, USA.
出版信息
Digit Health. 2019 Apr 12;5:2055207619844870. doi: 10.1177/2055207619844870. eCollection 2019 Jan-Dec.
OBJECTIVE
"Active couch potato" describes an individual who is sufficiently physically active yet highly sedentary. Cell phones promote activities understood as sedentary behaviors (e.g. watching videos). Research demonstrates that cell phone use is positively associated with sedentary behavior. Although sedentary behavior typically displaces physical activity, no relationship between cell phone use and physical activity has been found. Thus, it is possible that some sufficiently active individuals are also high-frequency cell phone users and therefore highly sedentary. In other words, cell phone use may predict being an "active couch potato" among active people. Testing this hypothesis was the purpose of this study. "Active couch potatoes" are of concern as the negative effects of excessive sedentary behavior are independent of the benefits of physical activity.
METHODS
College students (228) completed validated surveys assessing physical activity, sedentary behavior, and cell phone use. Using a previously validated method, participants were rated as sufficiently active or not based upon their physical activity survey score. Participants who were not sufficiently active were excluded from further analysis resulting in a final sample of 171. These sufficiently active individuals were categorized as "active couch potatoes" if they were also highly sedentary (i.e. sitting for eight or more hours/day). Logistic regression determined if cell phone use predicted being categorized as an "active couch potato."
RESULTS
Cell phone use was a significant, positive predictor of being an "active couch potato." With each additional hour of daily cell phone use, the odds of becoming an "active couch potato" increased by 11.4% (Wald = 5.934, = 0.015, Exp(B) = 1.114). On average, active couch potatoes used their cell phone 1.7 hours more each day than their sufficiently active but not overly sedentary peers.
CONCLUSION
Increased cell phone use was a significant predictor of being an "active couch potato." Explanations and implications are discussed.
目的
“活跃的沙发土豆”指的是身体活动量充足但久坐时间极长的人。手机会促成一些被视为久坐行为的活动（比如观看视频）。研究表明，使用手机与久坐行为呈正相关。虽然久坐行为通常会取代身体活动，但尚未发现使用手机与身体活动之间存在关联。因此，有可能一些身体活动量充足的人也是高频手机使用者，从而久坐时间极长。换句话说，在活跃人群中，使用手机可能预示着是一个“活跃的沙发土豆”。本研究的目的就是验证这一假设。“活跃的沙发土豆”令人担忧，因为久坐行为过多产生的负面影响与身体活动的益处无关。
方法
228名大学生完成了经过验证的调查问卷，评估身体活动、久坐行为和手机使用情况。使用之前经过验证的方法，根据参与者的身体活动调查问卷得分，将他们评定为身体活动量充足或不足。身体活动量不足的参与者被排除在进一步分析之外，最终样本为171人。如果这些身体活动量充足的个体也久坐时间极长（即每天坐8小时或更长时间），则被归类为“活跃的沙发土豆”。逻辑回归分析确定使用手机是否能预测被归类为“活跃的沙发土豆”。
结果
使用手机是被归类为“活跃的沙发土豆”的一个显著的正向预测因素。每天使用手机每增加一小时，成为“活跃的沙发土豆”的几率就会增加11.4%（Wald = 5.934，P = 0.015，Exp(B) = 1.114）。平均而言，“活跃的沙发土豆”每天使用手机的时间比身体活动量充足但不过度久坐的同龄人多1.7小时。
结论
手机使用增加是被归类为“活跃的沙发土豆”的一个显著预测因素。文中讨论了相关解释及影响。
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