Greenspace, physical activity, and BMI in children from two cities in northern Mexico

Sara Neelon, Alyssa Platt, Montserrat Bacardi-Gascon, Sarah Armstrong, Brian Neelon, Arturo Jimenez-Cruz

Research output: Contribution to journalArticle

Abstract

Numerous previous studies have reported positive associations between exposure to greenspace and children's physical activity, but in high-income countries only. Prior studies have also examined greenspace and obesity in children, but these have yielded inconsistent results and focused mostly on older children. The purpose of this study was to assess associations between time children spent in greenspace as the primary exposure and our outcomes of interest, including 1) minutes of physical activity, and 2) body mass index (BMI) z-score. Our sample was 102 children ages 3 to 5 years living in Ensenada and Tijuana, Mexico. We fit linear mixed models to estimate associations between greenspace and children's physical activity and BMI z-score. After adjustment for potential confounders, greater time in greenspace was associated with decreased sedentary time (−0.08 min per hour for each additional 30 min in greenspace; 95% CI −0.13, −0.04; p = 0.002) and increased moderate-to-vigorous physical activity (MVPA) (0.06; 95% CI 0.03, 0.10; p < 0.001). Results were driven primarily by children in Tijuana (−0.22; 95% CI −0.38, −0.06; p = 0.008 for sedentary time and 0.15; 95% CI 0.06, 0.38; p = 0.007 for MVPA). Time in greenspace was not associated with BMI z-score in children in Ensenada (0.001; 95% CI −0.008, 0.01; p = 0.83) or Tijuana (−0.009; 95% CI −0.02, 0.004; p = 0.17). Greater time in greenspace was associated with physical activity but not BMI in our sample of children—more so in Tijuana compared to Ensenada. Given high rates of obesity, interventions should aim to increase physical activity in young children in Northern Mexico.

Original languageEnglish (US)
Article number100870
JournalPreventive Medicine Reports
Volume14
DOIs
StatePublished - Jun 1 2019

Fingerprint

Mexico
Body Mass Index
Exercise
Pediatric Obesity
Linear Models
Obesity

Keywords

  • Global positioning system
  • Greenspace
  • Normalized Difference Vegetation Index
  • Obesity
  • Physical activity

ASJC Scopus subject areas

  • Health Informatics
  • Public Health, Environmental and Occupational Health

Cite this

Greenspace, physical activity, and BMI in children from two cities in northern Mexico. / Neelon, Sara; Platt, Alyssa; Bacardi-Gascon, Montserrat; Armstrong, Sarah; Neelon, Brian; Jimenez-Cruz, Arturo.

In: Preventive Medicine Reports, Vol. 14, 100870, 01.06.2019.

Research output: Contribution to journalArticle

Neelon, Sara ; Platt, Alyssa ; Bacardi-Gascon, Montserrat ; Armstrong, Sarah ; Neelon, Brian ; Jimenez-Cruz, Arturo. / Greenspace, physical activity, and BMI in children from two cities in northern Mexico. In: Preventive Medicine Reports. 2019 ; Vol. 14.
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abstract = "Numerous previous studies have reported positive associations between exposure to greenspace and children's physical activity, but in high-income countries only. Prior studies have also examined greenspace and obesity in children, but these have yielded inconsistent results and focused mostly on older children. The purpose of this study was to assess associations between time children spent in greenspace as the primary exposure and our outcomes of interest, including 1) minutes of physical activity, and 2) body mass index (BMI) z-score. Our sample was 102 children ages 3 to 5 years living in Ensenada and Tijuana, Mexico. We fit linear mixed models to estimate associations between greenspace and children's physical activity and BMI z-score. After adjustment for potential confounders, greater time in greenspace was associated with decreased sedentary time (−0.08 min per hour for each additional 30 min in greenspace; 95{\%} CI −0.13, −0.04; p = 0.002) and increased moderate-to-vigorous physical activity (MVPA) (0.06; 95{\%} CI 0.03, 0.10; p < 0.001). Results were driven primarily by children in Tijuana (−0.22; 95{\%} CI −0.38, −0.06; p = 0.008 for sedentary time and 0.15; 95{\%} CI 0.06, 0.38; p = 0.007 for MVPA). Time in greenspace was not associated with BMI z-score in children in Ensenada (0.001; 95{\%} CI −0.008, 0.01; p = 0.83) or Tijuana (−0.009; 95{\%} CI −0.02, 0.004; p = 0.17). Greater time in greenspace was associated with physical activity but not BMI in our sample of children—more so in Tijuana compared to Ensenada. Given high rates of obesity, interventions should aim to increase physical activity in young children in Northern Mexico.",
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