TY - JOUR
T1 - Moderating Effects of Weather-Related Factors on a Physical Activity Intervention
AU - Welch, Whitney A.
AU - Spring, Bonnie
AU - Phillips, Siobhan M.
AU - Siddique, Juned
N1 - Funding Information:
This work was supported by NIH grant R01 HL075451 (Spring). Whitney Welch is supported by NIH/National Cancer Institute training grant CA193193. Bonnie Spring is supported by R01DK108678, R01DK097364, American Heart Association 14SFRN20740001, and P30CA60553. Siobhan Phillips is supported by the National Cancer Institute K07CA196840. Juned Siddique is supported by R01HL127491 and R01HL131606. The study sponsor had no role in study design; collection, analysis, and interpretation of the data; writing of the report; or decision to submit the report for publication. Clinical Trial Registration: NCT00113672. Bonnie Spring serves on the Scientific Advisory Board for Actigraph. No other financial disclosures were reported by the authors of this paper.
Publisher Copyright:
© 2018 American Journal of Preventive Medicine
PY - 2018/5
Y1 - 2018/5
N2 - Introduction: The purpose of this study is to identify whether weather-related factors moderate the effect of a physical activity (PA) intervention. Methods: Participants (N=204, 77% female, mean age 33 [SD=11] years, mean BMI 28.2 [SD=7.1]) from the Make Better Choices 1 trial, enrolled April 2005 to April 2008, were randomized to one of two treatment conditions: (1) increase moderate to vigorous physical activity (MVPA) treatment group, or (2) decrease sedentary behavior control group. Participants wore an accelerometer for 5 weeks: a 2-week baseline assessment followed by a 3-week intervention. Accelerometer data were used to estimate minutes/day of MVPA. Average daily temperature, day length, and precipitation were obtained from the National Climatic Data Center and combined with the accelerometer data. Linear mixed effects models were used to determine whether these weather-related factors moderated the effect of the intervention on MVPA. Separate models were fit for season, daily average temperature, and day length. Results: There was a significant moderating effect of season on MVPA such that the PA intervention, as compared with control, increased MVPA 10.4 minutes more in the summer than in the winter (95% CI=1.1, 19.6, p=0.029). There was a significant moderating effect of daily temperature such that every 10°F increase in temperature was associated with an additional 1.5 minutes/day increase in the difference in MVPA increase between the two intervention conditions (95% CI=0.1, 2.9, p=0.015). There was a significant moderating effect of day length such that every additional hour of daylight was associated with a 2.23-minute increase in the PA intervention's impact on increasing MVPA (95% CI=0.8, 3.7, p=0.002). Conclusions: Day length and temperature had a significant moderating effect on change in MVPA during a PA intervention such that the intervention was less effective on colder days and on shorter days, independently. These results suggest that strategies to overcome environmental barriers should be considered when designing PA interventions for adults.
AB - Introduction: The purpose of this study is to identify whether weather-related factors moderate the effect of a physical activity (PA) intervention. Methods: Participants (N=204, 77% female, mean age 33 [SD=11] years, mean BMI 28.2 [SD=7.1]) from the Make Better Choices 1 trial, enrolled April 2005 to April 2008, were randomized to one of two treatment conditions: (1) increase moderate to vigorous physical activity (MVPA) treatment group, or (2) decrease sedentary behavior control group. Participants wore an accelerometer for 5 weeks: a 2-week baseline assessment followed by a 3-week intervention. Accelerometer data were used to estimate minutes/day of MVPA. Average daily temperature, day length, and precipitation were obtained from the National Climatic Data Center and combined with the accelerometer data. Linear mixed effects models were used to determine whether these weather-related factors moderated the effect of the intervention on MVPA. Separate models were fit for season, daily average temperature, and day length. Results: There was a significant moderating effect of season on MVPA such that the PA intervention, as compared with control, increased MVPA 10.4 minutes more in the summer than in the winter (95% CI=1.1, 19.6, p=0.029). There was a significant moderating effect of daily temperature such that every 10°F increase in temperature was associated with an additional 1.5 minutes/day increase in the difference in MVPA increase between the two intervention conditions (95% CI=0.1, 2.9, p=0.015). There was a significant moderating effect of day length such that every additional hour of daylight was associated with a 2.23-minute increase in the PA intervention's impact on increasing MVPA (95% CI=0.8, 3.7, p=0.002). Conclusions: Day length and temperature had a significant moderating effect on change in MVPA during a PA intervention such that the intervention was less effective on colder days and on shorter days, independently. These results suggest that strategies to overcome environmental barriers should be considered when designing PA interventions for adults.
UR - http://www.scopus.com/inward/record.url?scp=85045114171&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045114171&partnerID=8YFLogxK
U2 - 10.1016/j.amepre.2018.01.025
DO - 10.1016/j.amepre.2018.01.025
M3 - Article
C2 - 29551330
AN - SCOPUS:85045114171
SN - 0749-3797
VL - 54
SP - e83-e89
JO - American Journal of Preventive Medicine
JF - American Journal of Preventive Medicine
IS - 5
ER -
