Wijlhuizen Gert Jan, de Jong Roel, Hopman-Rock Marijke
Department Physical Activity and Health, TNO Quality of Life, Leiden, The Netherlands.
Prev Med. 2007 Mar;44(3):260-4. doi: 10.1016/j.ypmed.2006.11.003. Epub 2006 Dec 19.
The aim of this study was to test the assumption that the level of outdoor physical activity mediates the relationship between fear of falling and actual outdoor falls according to the Task Difficulty Homeostasis Theory.
A prospective follow-up study of 10 months conducted in the year 2000 in three municipalities in the province of Friesland, The Netherlands. The participants were 1752 people aged 65 and older, living independently, in the community. Main baseline data were age, sex, outdoor physical activities (walking, bicycling), and fear of outdoor falls. The number of people who fell outdoors was recorded.
People with a high fear of falling were more often low to moderately active or active compared with people who had no such fears and were more often very active. Fear of falling was not associated with outdoor falls, but it was after taking the level of physical activity into account.
Outdoor physical activity mediates the relationship between fear of falling and actual outdoor falls. This implies that the incidence of falls as an outcome in studies does not adequately represent the impact of risk factors for falls and that level of physical activity should be taken into account.
本研究旨在根据任务难度稳态理论，验证户外身体活动水平介导跌倒恐惧与实际户外跌倒之间关系这一假设。
2000年在荷兰弗里斯兰省的三个市镇进行了为期10个月的前瞻性随访研究。参与者为1752名65岁及以上的独立生活在社区中的老年人。主要基线数据包括年龄、性别、户外身体活动（步行、骑自行车）以及对户外跌倒的恐惧。记录户外跌倒的人数。
与无此类恐惧的人相比，高度害怕跌倒的人更常处于低至中度活动或活跃状态，且更常处于非常活跃状态。跌倒恐惧与户外跌倒无关联，但在考虑身体活动水平后则有关联。
户外身体活动介导了跌倒恐惧与实际户外跌倒之间的关系。这意味着在研究中作为结果的跌倒发生率并不能充分代表跌倒风险因素的影响，应考虑身体活动水平。
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