Dornsife Center for Self-Report Science, University of Southern California, Los Angeles, CA, United States.
Department of Psychology, University of Southern California, Los Angeles, CA, United States.
JMIR Form Res. 2024 Oct 24;8:e59950. doi: 10.2196/59950.
Emerging evidence suggests a positive association between relevant aspects of one's psychological identity and physical activity engagement, but the current understanding of this relationship is primarily based on scales designed to assess identity as a person who exercises, leaving out essential aspects of physical activities (eg, incidental and occupational physical activity) and sedentary behavior.
The goal of this study is to evaluate the validity of a new physical activity and sedentary behavior (PA/SB) identity scale using 2 independent samples of US adults.
In study 1, participants answered 21 candidate items for the PA/SB identity scale and completed the International Physical Activity Questionnaire-Short Form (IPAQ-SF). Study 2 participants completed the same PA/SB identity items twice over a 1-week interval and completed the IPAQ-SF at the end. We performed factor analyses to evaluate the structure of the PA/SB identity scale, evaluated convergent validity and test-retest reliability (in study 2) of the final scale scores, and examined their discriminant validity using tests for differences in dependent correlations.
The final PA/SB identity measure was comprised of 3 scales: physical activity role identity (F1), physical activity belief (F2), and sedentary behavior role identity (F3). The scales had high test-retest reliability (Pearson correlation coefficient: F1, r=0.87; F2, r=0.75; F3, r=0.84; intraclass correlation coefficient [ICC]: F1: ICC=0.85; F2: ICC=0.75; F3: ICC=0.84). F1 and F2 were positively correlated with each other (study 1, r=0.76; study 2, r=0.69), while both were negatively correlated with F3 (Pearson correlation coefficient between F1 and F3: r=-0.58 for study 1 and r=-0.73 for study 2; F2 and F3: r=-0.46 for studies 1 and 2). Data from both studies also demonstrated adequate discriminant validity of the scale developed. Significantly larger correlations with time in vigorous and moderate activities and time walking and sitting assessed by IPAQ-SF with F1, compared with F2, were observed. Significantly larger correlations with time in vigorous and moderate activities with F1, compared with F3, were also observed. Similarly, a larger correlation with time in vigorous activities and a smaller correlation with time walking were observed with F2, compared with F3.
This study provided initial empirical evidence from 2 independent studies on the reliability and validity of the PA/SB identity scales for adults.
新出现的证据表明，一个人的心理认同的某些方面与身体活动参与之间存在积极的关联，但目前对这种关系的理解主要基于评估作为锻炼者的身份的量表，而忽略了身体活动（如偶然和职业性身体活动）和久坐行为的重要方面。
本研究旨在使用美国成年人的 2 个独立样本评估新的身体活动和久坐行为（PA/SB）认同量表的有效性。
在研究 1 中，参与者回答了 PA/SB 认同量表的 21 个候选项目，并完成了国际体力活动问卷-短表（IPAQ-SF）。研究 2 中的参与者在 1 周的间隔内两次完成相同的 PA/SB 认同项目，并在最后完成 IPAQ-SF。我们进行了因子分析来评估 PA/SB 认同量表的结构，评估了最终量表得分的聚合效度和重测信度（在研究 2 中），并使用依赖相关差异检验来检验其判别效度。
最终的 PA/SB 认同测量由 3 个量表组成：身体活动角色认同（F1）、身体活动信念（F2）和久坐行为角色认同（F3）。这些量表具有较高的重测信度（Pearson 相关系数：F1，r=0.87；F2，r=0.75；F3，r=0.84；组内相关系数[ICC]：F1：ICC=0.85；F2：ICC=0.75；F3：ICC=0.84）。F1 和 F2 彼此之间呈正相关（研究 1，r=0.76；研究 2，r=0.69），而两者均与 F3 呈负相关（F1 和 F3 之间的 Pearson 相关系数：研究 1 为-0.58，研究 2 为-0.73；F2 和 F3：r=-0.46 分别在研究 1 和 2 中）。来自这两项研究的数据还表明，该量表具有足够的判别效度。与 F2 相比，F1 与 IPAQ-SF 评估的剧烈和中度活动时间以及步行和坐姿时间的相关性更大。与 F3 相比，F1 与剧烈活动时间的相关性也更大。同样，与 F2 相比，F1 与剧烈活动时间的相关性更大，与步行时间的相关性更小。
本研究从 2 个独立的研究中提供了关于成人 PA/SB 认同量表的可靠性和有效性的初步经验证据。
