Background/Objective

To identify the most relevant determinants involved in Physical Activity (PA) changes in the EVIDENT 3 study population, measured by the International PA Questionnaire (IPAQ) and the Actigraph GT3X accelerometer.Method: Exploratory study. Data used were collected from EVIDENT 3 study (N = 650). Items to measure psychological determinants were chosen from the baseline questionnaires. PA minutes/week were assessed by an accelerometer and IPAQ. The sample was analyzed by the control group (CG), the intervention group (IG) and Body Mass Index, using Confidence Interval-Based Estimation of Relevance (CIBER) analyses. Results: 486 participants, (IG: n = 251, CG: n = 235) were included. IG shows a positive association between PA assessed by accelerometer and self-efficacy. In IG, the overweight sample shows a positive association between PA assessed by accelerometer and motivation and self-efficacy. PA assessed by accelerometer obtained a higher explained variance (R²) in IG, both people with overweight (.10 - .55) and obesity (.03 - .19). In CG, IPAQ reached better results in people with overweight (.12 - .49). Conclusions: Motivation and self-efficacy showed as relevant in increasing PA minutes/week, but only in the people with overweight in IG. There might be other factors not analyzed that could improve the low R² obtained.

中文翻译：

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确定超重和肥胖人群体力活动的心理决定因素的相关性

 背景/目标

通过国际 PA 问卷 (IPAQ) 和 Actigraph GT3X 加速度计测量，确定与 EVIDENT 3 研究人群体力活动 (PA) 变化最相关的决定因素。方法：探索性研究。使用的数据来自 EVIDENT 3 研究（ N = 650）。测量心理决定因素的项目是从基线问卷中选择的。通过加速计和 IPAQ 评估每周 PA 分钟数。使用基于置信区间的相关性估计 (CIBER) 分析，按对照组 (CG)、干预组 (IG) 和体重指数对样本进行分析。结果：纳入 486 名参与者（IG： n = 251，CG： n = 235）。 IG 显示加速计评估的 PA 与自我效能之间呈正相关。在 IG 中，超重样本显示加速计评估的 PA 与动机和自我效能之间呈正相关。通过加速度计评估的 PA 在 IG 中获得了更高的解释方差 ( R ² )，无论是超重 (.10 - .55) 还是肥胖 (.03 - .19) 的人。在 CG 中，IPAQ 在超重人群中取得了更好的结果 (0.12 - 0.49)。结论：动机和自我效能与增加每周 PA 分钟数相关，但仅限于 IG 超重的人群。可能还有其他未分析的因素可以改善所获得的低 R ² 。