Related Experiment Video
Updated: Mar 9, 2026
Visualization of Intensity Levels to Reduce the Gap Between Self-Reported and Directly Measured Physical Activity
Published on: March 7, 2019
One-year Stability of Objectively Measured Physical Activity in Young Brazilian Adults
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.
Related Concept Videos
01:15Assessment of blood pressure in brachial artery(one-step method)
Prepare for the Procedure:
01:23Assessment of blood pressure in brachial artery(two-step method)
01:26Longitudinal Studies
01:26Exercise Stress Test
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes