University of Leeds, UK.
Br J Health Psychol. 2010 Nov;15(Pt 4):825-40. doi: 10.1348/135910710X486889. Epub 2010 Feb 12.
The present study attempts to develop and pilot the feasibility and efficacy of a novel intervention using affective messages as a strategy to increase physical activity (PA) levels in adolescents. Design An exploratory pilot randomized control trial was used to compare behaviour change over 2 weeks. A modified form of the International Physical Activity Questionnaire was used to assess PA behaviour. A total of 120 adolescents (16-19 years) from 4 sixth forms in West Yorkshire completed the field-based study.
Participants were randomly assigned to one of three experimental conditions, or the control condition (N=28). Participants in experimental conditions received 1 short messaging service (SMS) text message per day over the 2 weeks, which included manipulations of either affective beliefs (enjoyable/unenjoyable; N=31), instrumental beliefs (beneficial/harmful; N=30), or a combination of these (N=31). Control participants received one SMS text message per week. Outcomes were measured at baseline and at the end of the 2 week intervention.
PA levels increased by the equivalent of 31.5 minutes of moderate (four metabolic equivalent) activity per week during the study. Main effects of condition (p=.049), and current physical activity level (p=.002) were identified, along with a significant interaction between condition and current activity level (p=.006). However, when the sample was split at baseline into active and inactive participants, a main effect of condition remained for inactive participants only (p=.001). Post hoc analysis revealed that inactive participants who received messages targeting affective beliefs increased their activity levels significantly more than the instrumental (p=.012), combined (p=.002), and control groups (p=.018).
Strategies based on affective associations may be more effective for increasing PA levels in inactive individuals.
本研究旨在开发并初步验证一种新的干预措施的可行性和效果，该措施使用情感信息作为策略，以提高青少年的身体活动（PA）水平。
采用探索性初步随机对照试验比较了两周内行为变化。使用国际体力活动问卷的改良形式来评估 PA 行为。西约克郡 4 所六年级共 120 名青少年（16-19 岁）完成了现场研究。
参与者被随机分配到三个实验组或对照组（N=28）之一。实验组每天收到 1 条短消息服务（SMS）文本消息，为期 2 周，其中包括情感信念（愉快/不愉快；N=31）、工具信念（有益/有害；N=30）或这些信念的组合（N=31）的操作。对照组每周收到 1 条 SMS 文本消息。在基线和 2 周干预结束时测量结果。
在研究期间，PA 水平每周增加相当于 31.5 分钟的中度（四个代谢当量）活动。发现条件的主要影响（p=.049）和当前的身体活动水平（p=.002），以及条件和当前活动水平之间的显著相互作用（p=.006）。然而，当样本在基线时分为活跃和不活跃的参与者时，仅对不活跃的参与者存在条件的主要影响（p=.001）。事后分析显示，接受针对情感信念的信息的不活跃参与者的活动水平显著高于工具性（p=.012）、组合（p=.002）和对照组（p=.018）。
基于情感关联的策略可能更有效地提高不活跃个体的 PA 水平。
