Candotti Cláudia Tarragô, Gelain Grazielle Martins, Antoniolli Arthur, Araújo Liliane Martini, Vieira Adriane, Loss Jefferson Fagundes
Physical Education, Physiotherapy and Dance School of Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
Physical Education, Physiotherapy and Dance School of Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil.
J Manipulative Physiol Ther. 2019 Jun;42(5):372-378. doi: 10.1016/j.jmpt.2018.10.006. Epub 2019 Jun 29.
This study aimed to examine the reliability of postural variables analyzed by photogrammetry obtained at different instances on the same day and between 2 different days.
A sample composed of 24 healthy adult individuals of both sexes was submitted to photogrammetric postural assessment. From 35 seconds of filming, 7 photographs (of time instance at 0 second, 05 seconds, 10 seconds, 15 seconds, 20 seconds, 25 seconds, and 30 seconds) were extracted and digitalized on digital image-based postural assessment software. One factor repeated-measures analysis of variance quantified the alterations in the magnitude of the variables within and between sessions (factor time and factor day, respectively). The intraclass correlation coefficient (ICC), standard error of measurement (SEM), and minimal detectable change (MDC) were calculated to verify the repeatability and reproducibility.
The repeatability shows that postural variables did not present significant differences in the comparison among the 7 instances; all the variables had excellent and significant ICCs, and SEM and MDC values indicated measurement errors lower than 5%. The intrarater reproducibility shows that postural variables did not present significant differences between 2 days of evaluation; most of the variables had excellent and significant ICCs, and SEM and MDC values were between 0.9% and 12.5%.
The results for repeatability and reproducibility show that most of the variables have excellent and significant ICCs. Postural evaluation by photogrammetry can be performed at any time within a 30-second interval counting from the positioning of the participant for assessment. Therefore, we conclude that a single photograph can represent the static posture of an individual in the postural evaluation, which is reliable enough and useful to determine the effects of an intervention either in clinical practice or in research.
本研究旨在检验通过摄影测量法分析的姿势变量在同一天不同时刻以及两天之间的可靠性。
选取24名健康成年男女组成样本，进行摄影测量姿势评估。从35秒的拍摄中，提取7张照片（分别为0秒、5秒、10秒、15秒、20秒、25秒和30秒时刻的照片），并在基于数字图像的姿势评估软件上进行数字化处理。单因素重复测量方差分析量化了各时段内和各时段间变量大小的变化（分别为因素时间和因素日）。计算组内相关系数（ICC）、测量标准误（SEM）和最小可检测变化（MDC）以验证重复性和再现性。
重复性表明，姿势变量在7个时刻的比较中未呈现显著差异；所有变量均具有优秀且显著的ICC值，SEM和MDC值表明测量误差低于5%。评估者内再现性表明，姿势变量在两天的评估之间未呈现显著差异；大多数变量具有优秀且显著的ICC值，SEM和MDC值在0.9%至12.5%之间。
重复性和再现性结果表明，大多数变量具有优秀且显著的ICC值。从参与者定位进行评估开始，在30秒间隔内的任何时间均可通过摄影测量法进行姿势评估。因此，我们得出结论，在姿势评估中，单张照片即可代表个体的静态姿势，其可靠性足以在临床实践或研究中确定干预效果，且十分有用。
