Memorial DayOur office will be closed Monday, May 30th in observance of Memorial Day. We will reopen at regular business hours on Tuesday, May 31st.
Association between Physical Activity, Sedentary Time and Healthy Fitness in Youth.
- Published on June 27, 2014
Purpose: To examine the associations between objectively measured physical activity (PA), sedentary time, and health-related fitness; and to investigate the combined association of PA and sedentary time on health-related fitness in youth.
Methods: PA and sedentary time were assessed with accelerometers in 2506 youth aged 10-18 years (M age=13.2+/-2.3). Participants were classified as active (>=60 min/day MVPA) versus inactive (<60 min/day MVPA), and as low versus high sedentary (according to the median value of sedentary time/day) and thereafter grouped as active/low sedentary, active/high sedentary, inactive/low sedentary, and inactive/high sedentary. Five physical fitness tests (body mass index [BMI], push-ups, curl-ups, sit and reach, and the PACER test) were assessed with FITNESSGRAM and participants were categorized as being in the healthy versus the unhealthy fitness zone (HFZ). A fitness composite score was calculated using the individual fitness tests z-score. Regression models were used to examine the relationship between PA, sedentary time and physical fitness.
Results: Time spent in MVPA (min/day) ([beta]=0.002, p<0.001) was significantly associated with the fitness score independent of sedentary time. Sedentary time was not associated with physical fitness independent of MVPA. Compared to the inactive/high sedentary group (referent), being categorized as active/low sedentary was associated with an increased likelihood of being in the HFZ for sit and reach (OR=2.55, 95% CI: 1.96-3.32) and having a higher fitness composite score (OR=1.38, 95% CI: 1.13-1.69).
Conclusions: Time in MVPA was associated with better physical fitness independent of sedentary time. Participants classified as active/low sedentary had higher odds of being in the HFZ, for flexibility, and to have a better fitness composite score. These findings suggest that time in MVPA contributes to better physical fitness in youth.