Maher Jaclyn P, Dzubur Eldin, Nordgren Rachel, Huh Jimi, Chou Chih-Ping, Hedeker Donald, Dunton Genevieve F
University of North Carolina at Greensboro, Department of Kinesiology,1408 Walker Avenue, Greensboro, NC 27402.
University of Southern California, Department of Preventive Medicine, 2001 N. Soto. Street, Los Angeles, CA 90032.
Psychol Sport Exerc. 2019 Mar;41:153-161. doi: 10.1016/j.psychsport.2018.01.011. Epub 2018 Feb 5.
Higher levels of positive affect and feelings of energy and vitality are associated with greater physical activity (PA) and lower sedentary time (ST). However, whether fluctuations in these feelings contribute to the regulation of these behaviors is unclear. This study examined the extent to which within-person variability in positive affect and feeling energetic predicted participants' overall levels of PA and ST.
This analysis combined data from four ecological momentary assessment (EMA) studies (age: 8-73 years) with ambulatory monitoring via waist-worn accelerometry (N=661).
Positive affect and energy were assessed through EMA several times per day across 4-7 days. Accelerometer data was used to create the following behavioral outcomes: (1) meeting MVPA guidelines (children: 60 minutes/day, adults: 30 minutes/day) and (2) minutes of ST per hour of accelerometer wear. A two-stage analytic approach was used to test the study aim. In the first stage, Mixed-Effects Location Scale Modeling decomposed mean levels and variability in positive affect and energy. In the second stage, a linear or logistic regression (depending on whether the outcome was continuous or dichotomous, respectively) was tested to investigate associations between subject-level mean and variability in EMA ratings and the behavioral outcome.
Greater subject-level variability but not subject-level mean of feeling energetic was associated with lower odds of meeting MVPA guidelines (β=-0.43, p<0.05).
Fluctuations in physical feeling states may deplete self-regulatory resources involved in planning and implementing PA behavior. Alternatively, being more physically active may stabilize one's perceived energy levels.
较高水平的积极情绪以及精力和活力感与更多的身体活动（PA）和更少的久坐时间（ST）相关。然而，这些情绪的波动是否有助于调节这些行为尚不清楚。本研究考察了积极情绪和精力充沛感的个体内部变异性在多大程度上预测了参与者的总体PA和ST水平。
本分析将来自四项生态瞬时评估（EMA）研究（年龄：8 - 73岁）的数据与通过佩戴在腰部的加速度计进行的动态监测相结合（N = 661）。
在4 - 7天内，每天通过EMA多次评估积极情绪和精力。加速度计数据用于创建以下行为结果：（1）达到中等至剧烈身体活动（MVPA）指南（儿童：每天60分钟，成人：每天30分钟）以及（2）每小时佩戴加速度计的久坐时间。采用两阶段分析方法来检验研究目的。在第一阶段，混合效应位置尺度模型分解了积极情绪和精力的平均水平及变异性。在第二阶段，进行线性或逻辑回归（分别取决于结果是连续的还是二分的）以研究EMA评分中个体水平的均值和变异性与行为结果之间的关联。
个体水平上更大的变异性而非精力充沛感的个体水平均值与达到MVPA指南的较低几率相关（β = -0.43，p < 0.05）。
身体感觉状态的波动可能会耗尽参与计划和实施PA行为的自我调节资源。或者，更多的身体活动可能会稳定一个人的感知能量水平。
