Association of light exposure on physical activity and sedentary time in young people.

Daniel Aggio,Abigail Fisher,Lee Smith,Mark Hamer

doi:10.3390/ijerph120302941

Abstract

Background: To investigate whether light exposure was associated with objectively measured physical activity (PA) and sedentary behaviour in young people. Methods: Participants (n = 229, 46.7% female) were young people (mean 8.8 years [SD ± 2.2]) from the borough of Camden, UK. Daily sedentary time, moderate and vigorous PA (MVPA) and light exposure were measured using a tri-axial accelerometer with an ambient light sensor during the summer. Multiple linear regression models examined associations between average daily light exposure, sedentary time and time in MVPA. Models were repeated investigating weekdays and weekend days separately. Analyses were adjusted for pre-specified covariables, including age, sex, device wear time, ethnic group, school and body fat. Results: There were significant associations between average daily light exposure and time sedentary (β coefficient = −11.2, 95% CI, −19.0 to −3.4) and in MVPA (β coefficient = 3.5, 95% CI, 1.2 to 5.9). Light exposure was significantly associated with weekend sedentary time (β coefficient = −10.0, 95% CI, −17.6, −2.4), weekend MVPA (β coefficient = 3.7, 95% CI, 1.7, 5.7), weekday sedentary time (β coefficient = −15.0, 95% CI, −22.7 to −7.2), but not weekday MVPA (β coefficient = 2.0, 95% CI, −0.5 to 4.5). Conclusion: Average daily light exposure is positively associated with time in MVPA and negatively associated with sedentary time. Increasing daylight exposure may be a useful intervention strategy for promoting physical activity.

Highlights

Regular participation in physical activity is associated with a reduced risk of several non-communicable disease risk factors in young people [1,2]
Less than a quarter of young people in England are sufficiently active to meet the current recommendations [3] of 60 min moderate-to-vigorous intensity physical activity (MVPA) per day
This paper aimed to investigate whether light exposure was associated with objectively measured physical activity and sedentary behaviour

Summary

Introduction

Regular participation in physical activity is associated with a reduced risk of several non-communicable disease risk factors in young people (aged 4 to 15 years) [1,2]. Evidence has been accumulating for a role of the physical environment in promoting or hindering physical activity behaviour in young people [5] Factors such as access to green/open spaces [6,7] and walking/cycling infrastructures are associated with higher physical activity levels. Seasonal patterns in clinical events have been observed, with better survival rates in the summer [12,13]. These health outcomes are strongly associated with physical activity levels [14,15,16], but the relationship between light exposure and physical activity is poorly understood. To investigate whether light exposure was associated with objectively measured physical activity (PA) and sedentary behaviour in young people

Objectives

Methods

Results

Conclusion