Jaclyn P Maher1,2, Eldin Dzubur2, Rachel Nordgren3, Jimi Huh2, Chih-Ping Chou2, Donald Hedeker4, Genevieve F Dunton2. 1. University of North Carolina at Greensboro, Department of Kinesiology,1408 Walker Avenue, Greensboro, NC 27402. 2. University of Southern California, Department of Preventive Medicine, 2001 N. Soto. Street, Los Angeles, CA 90032. 3. University of Illinois at Chicago, School of Public Health, 1603 West Taylor Street, Chicago, IL 60612. 4. University of Chicago, Department of Public Health Sciences, 5841 South Maryland Avenue Chicago, IL 60637.
Abstract
OBJECTIVES: 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. DESIGN: This analysis combined data from four ecological momentary assessment (EMA) studies (agerange: 8-73 years) with ambulatory monitoring via waist-worn accelerometry (N=661). METHODS: 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. RESULTS: 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). CONCLUSIONS: 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.
OBJECTIVES: 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. DESIGN: This analysis combined data from four ecological momentary assessment (EMA) studies (agerange: 8-73 years) with ambulatory monitoring via waist-worn accelerometry (N=661). METHODS: 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. RESULTS: 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). CONCLUSIONS: 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.
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