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Clinical Trial Summary

There is emerging evidence that an excessive amount of sitting is linked with an increased risk of negative health outcomes independent of an individual's physical activity levels. This is concerning considering data indicate Americans spend over half of the waking day engaged in sedentary activities, and that individuals who are overweight or obese and/or have a chronic disease such as hypertension are likely to have an even higher level of sedentary behavior. A limited number of experimental studies have looked at the effects of reducing sitting time on blood pressure and have shown promise. However, these studies lasted for only a day, so it is unclear how reducing sedentary time may influence blood pressure over a longer duration. The purpose of this study is to look the relationships between the amount of time a person spends sitting and their blood pressure and examine whether decreasing sedentary behavior helps improve blood pressure. The study employs the use of coaching calls and a mobile health (mHealth) intervention to reduce the sedentary behavior of participants through strategies such as prompting, feedback, and counseling.

Clinical Trial Description

The purpose of this study is to determine the effect of a 4-week sedentary behavior reduction intervention on objectively measured sedentary behavior of overweight or obese adults. The proposed study is a pilot, proof-of-concept randomized controlled trial that will randomize participants to either the 1) Immediate Intervention group, which will receive coaching calls + a mHealth intervention for the first four weeks of the study and then will receive only the mHealth intervention for the remaining 4 weeks or the 2) Delayed Intervention Control group, which will act as an assessment-only condition for the first 4 weeks and then will receive the coaching calls + mHealth intervention for 4-weeks. This design has two phases: Phase 1, which is a randomized controlled feasibility pilot and the primary study focus, followed by Phase 2, which is an exploratory phase, allowing replication of the intervention (in the Delayed Intervention Control group) and extended follow-up (in the Immediate Intervention group).

The study outcomes to be investigated in Phase 1 include:

- 1) the change in total % sedentary time from baseline to the 4-week assessment, comparing the average proportion of objectively-measured time spent sitting during the waking day across the previous week in the Immediate Intervention group (which will have received the 4-week coaching calls + mHealth sedentary behavior reduction intervention) with the average proportion of objectively-measured waking sedentary time across the previous week in the Delayed Intervention Control group (which will have received assessment only during this period).

- 2) the change in blood pressure, comparing the Immediate Intervention group (which will have received the 4-week coaching calls + mHealth sedentary behavior reduction intervention) with the Delayed Intervention Control group (which will have received assessment only during this period).

- 3) Process data on participant recruitment to the study, and, among those randomized to the Immediate intervention, engagement with the intervention (e.g., response rates to the texts, completion of intervention phone calls, etc.), and participant evaluation of the intervention.

The study outcomes to be investigated in Phase 2 include:

- 1) Objectively measured sedentary behavior in the Immediate Intervention group 4 weeks post-treatment (i.e. at 8-week assessment), allowing quantification of maintenance of sedentary behavior reduction following the termination of coaching calls.

- 2) Objectively-measured sedentary behavior and blood pressure at 8 weeks post randomization in the Delayed Intervention Control group (i.e. following implementation of the 4-week coaching calls+ mHealth intervention), allowing assessment of whether intervention effects are reproducible. ;

Study Design

Related Conditions & MeSH terms

NCT number NCT03698903
Study type Interventional
Source University of South Carolina
Contact Chelsea Larsen, MPH
Phone 803-777-2702
Status Recruiting
Phase N/A
Start date August 1, 2018
Completion date November 2019

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