Habitual Physical Activity, Sedentary Time
Conditions
Keywords
physical inactivity, exercise training, sedentary time, habitual physical activity
Brief summary
The purpose of this study is to determine if individuals involved in exercise training change habitual activity and inactivity behavior outside of exercise training. Eligible participants were randomly assigned to one of four groups: control, exercise training, sedentary time reduction, or exercise training plus sedentary time reduction. It was hypothesized that participants in the exercise training group will compensate for exercise training by reducing free-living physical activity behavior and increasing sedentary time. Participant free-living behavior was monitored for one week at baseline, 3, 6, 9 and 12 weeks using an activPAL wearable monitor.
Interventions
BEHAVIORALexercise training
12 weeks, 5 days of week, 40 min per session of exercise training
BEHAVIORALsedentary time reduction
participants provided with strategies to decrease sitting
BEHAVIORALexercsie training plus sedentary time reduction
12 weeks of exercise training (5 days a week, 40 min per session) plus given strategies for reducing sitting time
Sponsors
National Heart, Lung, and Blood Institute (NHLBI)
University of Massachusetts, Amherst
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
20 Years to 60 Years
Healthy volunteers
Yes
Inclusion criteria
Eligible participants were those at increased risk of cardiovascular disease, based on meeting two of the following three criteria: 1. Pre-hypertensive: resting blood pressure between 125-160 mm Hg systolic and/or 85-100 mm Hg diastolic, 2. overweight/obese: body mass index (BMI) between 25 and 45 kg∙m-2, 3. high central adiposity: as defined by elevated natural waist circumference (\> 102 cm \[males\] \> 88cm \[females\]), a surrogate measure of visceral fat 4. low aerobic fitness (VO2 peak ≤ 50th percentile of age and sex specific norms) 5. exercising less than three days per week for less than 20 minutes per session for the preceding six months
Exclusion criteria
* major orthopedic limitations, * wheelchair use or musculoskeletal problems that affected mobility, * life-threatening illness (e.g., terminal cancer), * chronic diseases (e.g., diagnosed heart disease, diabetes, emphysema) or * any condition for which a physician did not recommend exercise. Participants were excluded if they had gastric bypass or lap-band surgery within the last year, were taking medication for type II diabetes (e.g. metformin) or beta-blocker medication for high blood pressure.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| change from baseline in sedentary time at 12 weeks | 12 weeks | Measure is based on data collected with a wearable monitor that assesses time spent sitting/lying, standing, and walking |
| change from baseline in sedentary time at 3 weeks | 3 weeks | Measure is based on data collected with a wearable monitor that assesses time spent sitting/lying, standing, and walking |
| change from baseline in sedentary time at 6 weeks | 6 weeks | Measure is based on data collected with a wearable monitor that assesses time spent sitting/lying, standing, and walking |
| change from baseline in sedentary time at 9 weeks | 9 weeks | Measure is based on data collected with a wearable monitor that assesses time spent sitting/lying, standing, and walking |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| change from baseline in physical activity at 3 weeks | 3 weeks | wearable monitor (activPAL) assesses number of steps, MVPA |
| change from baseline in physical activity at 6 weeks | 6 weeks | wearable monitor (activPAL) assesses number of steps, MVPA |
| change from baseline in physical activity at 9 weeks | 9 weeks | wearable monitor (activPAL) assesses number of steps, MVPA |
| change from baseline in physical activity at 12 weeks | 12 weeks | wearable monitor (activPAL) assesses number of steps, MVPA |
Countries
United States
Outcome results
None listed