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

Background:

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.

Methods:

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.

Results:

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).

Conclusions:

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 (rafamartins1@gmail.com) is corresponding author.