One-year Stability of Objectively Measured Physical Activity in Young Brazilian Adults

in Journal of Physical Activity and Health
Restricted access

Purchase article

USD $24.95

Student 1 year subscription

USD $115.00

1 year subscription

USD $153.00

Student 2 year subscription

USD $218.00

2 year subscription

USD $285.00


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.

Martins and Bielemann are with the Post-graduate Program in Epidemiology; Reichert and Hallal are with the Post-graduate Program in Physical Education; Universidade Federal de Pelotas, Pelotas, Rio Grande do Sul, Brazil.

Martins ( is corresponding author.