Recruiting

Observational StudyWatchWell: Simple and Practical Strategies to Reduce the Negative Health Impact of Sedentary Screen Time

Sponsor:

Arizona State University

Code:

NCT06963736

Conditions

Sedentary Time

Cardiovascular Diseases

Prediabetes

Obesity

Eligibility Criteria

Sex: All

Age: 26+

Healthy Volunteers: Accepted

Interventions

Blue light

Eating

Standing

Study Details

Brief summary:

The purpose of this study is to determine the feasibility, acceptability, efficacy, and participant adherence in using home-based technologies and wearable devices and simple, practical strategies to reduce the negative impact that evening screen time may have on your health.

Conditions

Sedentary Time

Cardiovascular Diseases

Prediabetes

Obesity

Study ID

NCT06963736

Start date

Aug 7, 2025

Status verified date

Feb, 2026

Completion date

Jul 31, 2026

Anticipated

Primary completion date

Jul 31, 2026

Anticipated

Eligibility Criteria

Sex: All

Age: 26+

Healthy Volunteers: Accepted

Inclusion Criteria

≥26 years of age
BMI ≥ 27 kg/m2\*; ≥25 kg/m2, if Asian (full or multiple race)\*\*
Insufficiently active (per US National Guidelines for Physical Activity of 150 minutes of MVPA/Week)
Reporting an average of ≥3 hours of recreational sedentary screen time (rSST) per day, that usually extends at least until 9:00pm.
On a typical night, consumes calories (food and/or drink) after 8:00pm.
Meet at least 2 criteria for metabolic syndrome

Central adiposity: waist circumference >40 inches (men); >35 inches (women)
Elevated blood pressure: SBP >130 mmHg and/or DBP >85 mmHg OR controlled with medication
Low high density lipoprotein (HDL) cholesterol: <40 mg/dL (men); <50 mg/dL (women)
Elevated triglycerides: >150 mg/dL OR controlled with medication
Elevated fasting glucose: ≥100 mg/dL OR controlled with medication

Exclusion Criteria

Conditions related to sleep disruption, including lactation, pregnancy, mid-night care providers, sleep disorders, severe sleep apnea
History of hypoglycemia
Pacemaker
Caffeine consumption in excess and/or after 5pm (excess equals >4 cups of coffee per day or equivalent)
Involvement in other physical activity, diet, or weight loss programs/studies
Weight change of 5% up or down in the last three months.
Drug abuse
THC use (smoking, edibles)
Excessive alcohol use (for women, 8 or more drinks per week; for men, 15 or more drinks per week)
Current smoker or user of any nicotine source - any amount or form (vapor/e-cig/tobacco/patch, gum, etc.)
Medications that markedly impact glucose metabolism and sleep (insulin, corticosteroids, growth hormone, melatonin)
Previous or current diagnosis of a clinical eating disorder (e.g., night eating syndrome, anorexia, bulimia, binge eating disorder); or self-report eating disorder behaviors
Unstable or poorly controlled blood glucose (e.g., hypoglycemia, fasting glucose greater than 125 mg/dL)
Chronic illness that may be associated with weight change (HIV/AIDS, active cancer, or uncontrolled thyroid disease)
Shift work
Recent or upcoming jetlag (travel 3 months prior and during study that is >1 time zone away from Arizona)
Current practice of evening and nighttime blue light blocking.
Poorly controlled hypertension (SBP ≥165 or DBP ≥100)
Any condition or circumstance that would prevent compliance to the protocol
Use non-android phone as their primary/personal phone

Study Design

Enrollment

30 participants

Anticipated

Allocation

Randomized

Intervention Model

Crossover

Primary purpose

Other

Interventions and Outcome Measures

Arms

experimental: Blue light-Eating

Intervention 1: Participants will be encouraged to wear blue light blocking glasses at 8pm until bed time.

Intervention 2: Participants will be encouraged to stop eating at 8pm.

experimental: Blue light-standing

Intervention 1: Participants will be encouraged to wear blue light blocking glasses at 8pm until bed time.

Intervention 2: Participants will be sent notifications each hour on the hour from 5pm until bed time to stand for 10 minutes that hour.

experimental: Eating-Standing

Intervention 1: Participants will be encouraged to stop eating at 8pm. Intervention 2: Participants will be sent notifications each hour on the hour from 5pm until bed time to stand for 10 minutes that hour.

experimental: Eating-Blue Light

Intervention 1: Participants will be encouraged to stop eating at 8pm. Intervention 2: Participants will be encouraged to wear blue light blocking glasses at 8pm until bed time.

experimental: Standing-Blue Light

Intervention 1: Participants will be sent notifications each hour on the hour from 5pm until bed time to stand for 10 minutes that hour.

Intervention 2: Participants will be encouraged to wear blue light blocking glasses at 8pm until bed time.

experimental: Standing-Eating

Interventions

Blue light

Blue light blocking glasses use and discouraged late night eating.

Eating

Encouraged not to eat past 8pm.

Standing

Encouraged to stand for 10 minutes per hour each out from 5pm to bed time.

Primary outcome measure

Treatment acceptability [ Time Frame: 2 weeks ]
Changes in Evening Sedentary Screen Time [ Time Frame: 2 weeks ]
Change in evening postprandial glycemic control (5pm - 5am) [ Time Frame: 2 weeks ]

Central Contacts and Locations

Central contacts

Dorothy Sears, PhD

602-496-3351 dsbanks@asu.edu

Jen Jondac, BS

602-543-6551 jenjondac@asu.edu

Locations

Arizona State University

Recruiting

Tempe, Arizona, United States, 85281

Contacts

Matthew P Buman, PhD

602-827-2289 mbuman@asu.edu

Dorothy D Sears, PhD

602-496-3351 dorothy.sears@asu.edu

More Information

Sponsor

Arizona State University

Last update posted

Feb 25, 2026

Last verified

Feb, 2026

Keywords

sedentary screen time
blue light
sedentary behavior
standing
crossover design
glucose metabolism

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-11. This information was provided to ClinicalTrials.gov by Arizona State University on 2026-02-25.