title: One-year Stability of Objectively Measured Physical Activity in Young Brazilian Adults.
abstract: To evaluate the 1-year stability of objectively measured physical activity among young adults living in South Brazil, as well as assessing the influences of temperature, humidity and precipitation on physical activity.
  
  
  
  A longitudinal study was conducted over 12 consecutive months (October 2012 to September 2013). Sixteen participants (8 men) used GT3X+ accelerometers 1 week per month for the entire year. Climate variables were obtained from an official climate information provider.
  
  
  
  Physical activity was remarkably stable over the year-the proportion of the day spent in moderate-to-vigorous intensity physical activity (MVPA) was around 5% in every month. Average temperature (ρ = -0.64; P = .007), humidity (ρ = -0.68; P = .004) and rain (ρ = -0.67; P = .004) were inversely correlated to MVPA in the Summer. Rain was also inversely correlated to MVPA in the Spring (ρ = -0.54; P = .03).
  
  
  
  Objectively measured physical activity was stable over a 1-year period. Climate variables consistently influenced physical activity practice in the Summer, but not in the other seasons.
authors.forename: Rafaela Costa
authors.initials: RC
authors.lastname: Martins
authors.forename: Felipe Fossati
authors.initials: FF
authors.lastname: Reichert
authors.forename: Renata Moraes
authors.initials: RM
authors.lastname: Bielemann
authors.forename: Pedro C
authors.initials: PC
authors.lastname: Hallal
mesh_terms: D061725:Accelerometry; D000293:Adolescent; D000328:Adult; D000704:Analysis of Variance; D001938:Brazil; D015444:Exercise; D005260:Female; D006801:Humans; D006813:Humidity; D008137:Longitudinal Studies; D008297:Male; D011891:Rain; D012621:Seasons; D013696:Temperature; D055815:Young Adult
keywords: accelerometry; climate; motor activity; seasonal variation; weather