School of Physical Education, Behavioural Medicine Laboratory, Faculty of Education, University of Victoria, PO Box 3015 STN CSC, Victoria, BC V8W 3P1, Canada.
Int J Behav Med. 2011 Sep;18(3):229-34. doi: 10.1007/s12529-010-9133-6.
Time spent on sedentary behaviors is often blamed for low physical activity rates, but tests of time displacement are limited.
The purpose of this study was to examine time-graded assessments of self-efficacy to engage in physical activity compared to either high- or low-ranked sedentary leisure behaviors among a workplace sample. Several demographic factors were examined as moderators of time displacement.
Participants were a worksite sample of 2,009 men and women who completed measures of demographics, physical activity, and self-efficacy after performing a thought listing procedure to generate their most-/least-preferred sedentary leisure-time behaviors.
Repeated measures analysis of variance across four gradients of available leisure-time (20, 30, 60, 120 min) showed some evidence of displacement (20 min less confident than 120 min) when considering their most preferred sedentary behavior but not their least preferred. These results, however, were moderated by age, occupational work hours, free time, education, and physical activity status.
Targeted interventions for young professionals with high work hours and limited physical activity experience seem prudent in order to improve their self-efficacy to achieve regular physical activity through sedentary behavior control.
久坐行为所花费的时间通常被归咎于低体力活动水平，但时间置换的测试是有限的。
本研究的目的是在工作场所样本中，与高或低排名的久坐休闲行为相比，检查对进行体力活动的自我效能感的时间分级评估。还检查了几个人口统计学因素作为时间置换的调节剂。
参与者是一项工作场所样本，共有 2009 名男性和女性，他们在完成关于人口统计学、体力活动和自我效能感的测量后，进行了思维列表程序，以生成他们最喜欢和最不喜欢的久坐休闲时间行为。
在考虑最偏好的久坐行为时，跨越可用休闲时间（20、30、60、120 分钟）的四个梯度的重复测量方差分析显示出一些置换的证据（20 分钟的信心比 120 分钟低），但在考虑最不喜欢的行为时则没有。然而，这些结果受到年龄、职业工作时间、空闲时间、教育程度和体力活动状况的调节。
对于高工作时间和有限体力活动经验的年轻专业人员，似乎有必要进行有针对性的干预，以通过控制久坐行为提高他们实现定期体力活动的自我效能感。
