چکیده (انگلیسی):

Background: Overweight and obesity has become a serious public health problem in many parts of the world. Studies suggest that making small
changes in daily activity levels such as “breaking-up” sedentary time (i.e., standing) may help mitigate the health risks of sedentary behavior.
The aim of the present study was to examine time spent in standing (determined by count threshold), lying, and sitting postures (determined by
inclinometer function) via the ActiGraph GT3X among sedentary adults with differing weight status based on body mass index (BMI)
categories.
Methods: Participants included 22 sedentary adults (14 men, 8 women; mean age 26.5
4.1 years). All subjects completed the self-report
International Physical Activity Questionnaire to determine time spent sitting over the previous 7 days. Participants were included if they
spent seven or more hours sitting per day. Postures were determined with the ActiGraph GT3X inclinometer function. Participants were
instructed to wear the accelerometer for 7 consecutive days (24 h a day). BMI was categorized as: 18.5 to <25 kg/m2 as normal, 25 to <30 kg/m2
as overweight, and 30 kg/m2 as obese.
Results: Participants in the normal weight (n ¼ 10) and overweight (n ¼ 6) groups spent significantly more time standing (after adjustment for
moderate-to-vigorous intensity physical activity and wear-time) (6.7 h and 7.3 h respectively) and less time sitting (7.1 h and 6.9 h respectively)
than those in obese (n ¼ 6) categories (5.5 h and 8.0 h respectively) after adjustment for wear-time ( p < 0.001). There were no significant
differences in standing and sitting time between normal weight and overweight groups ( p ¼ 0.051 and p ¼ 0.670 respectively). Differences were
not significant among groups for lying time ( p ¼ 0.55).
Conclusion: This study described postural allocations standing, lying, and sitting among normal weight, overweight, and obese sedentary adults.
The results provide additional evidence for the use of increasing standing time in obesity prevention strategies.