Medical Information Only. Always consult your healthcare provider before enrolling in any clinical trial.
NCT03417440 · ClinicalTrials.gov registry record · NA
A Smartphone App to Improve Physical Activity
A NA study, sponsored by University of Southern California.
- Completed
- Registry status
- NA
- Development phase
- 111
- Enrollment target
NCT03417440: Completed NA study, sponsored by University of Southern California.
NCT03417440 is a NA study that has completed, run by University of Southern California. The registered enrollment target is 111 participants, below the 1,404-participant average among 58,714 other NA trials with a reported enrollment target (92% lower). According to ClinicalTrials.gov, the official US trial registry.
The verdict
NCT03417440, a NA study, has completed, sponsored by University of Southern California.
- COMPLETED
- Registry status
- NA
- Development phase
- 111 participants
- Enrollment target
Study Summary
The purpose of this study is to develop, test, and optimize a physical activity (PA)-tracking smartphone app and specialty features, which are designed to facilitate older adults' PA by targeting common barriers in this population. For example, one feature sends messages throughout the day about the good things about growing older to combat negative views about aging which has been linked to decreased PA. Participants will include older adult smartphone users who are between the ages of 65 and 84 and are not very physically active. In phase one of the study, three groups of five older adults will be formed to test the PA-tracking app and one of three specialty features for a two-week period, followed by a focus group to learn about the older adults' experiences. In phase two, approximately 100 participants will be randomly assigned to one of eight groups that include various combinations of specialty features with the PA tracker, for the purpose of pilot testing the app for a four-month period. Testing will occur at the beginning and the end of the four-month intervention period, and will measure PA levels, sedentary activity time, self-reported PA, and functional mobility.
Primary Outcome
Step counts (objective physical activity) were measured using the activPAL thigh-worn accelerometer during a 72-hour monitoring period. Estimated average change is computed as the change in activPAL-tracked mean daily steps at Month 4 relative to baseline; this outcome is analyzed in a linear regression analysis model. All randomized participants who started the intervention and had valid activity monitor data were utilized in the model (ITT analysis)
Interventions
- OTHER Physical Activity (PA) Tracker App
- OTHER On Your Feet
- OTHER Coach Me
- OTHER Proof Positive
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 111 participants |
| Start Date | 2018-04-23 |
| Est. Completion | 2021-01-12 |
| Phase | NA |
What the finished NCT03417440 record still lists
NCT03417440 is an interventional study that assigns participants to a tested intervention. The registered 111 participants enrollment target is mid-sized for trials with a published cap, below the 1,404-participant average among 58,714 other NA trials with a reported enrollment target (92% lower).
The record links to 0 conditions, and to 4 interventions - of which Physical Activity (PA) Tracker App is the first listed.
NCT03417440 does not publish any study locations in the registry export this page uses.
Frequently Asked Questions
What is clinical trial NCT03417440 about?
NCT03417440 is a clinical study titled "A Smartphone App to Improve Physical Activity". The purpose of this study is to develop, test, and optimize a physical activity (PA)-tracking smartphone app and specialty features, which are designed to facilitate older adults' PA by targeting common barriers in this population. For example, one feature sends messages throughout the day about the...
What is the current status of trial NCT03417440?
This trial is currently completed. It is a NA study. The enrollment target is 111 participants. The study started on 2018-04-23. Estimated completion is 2021-01-12.
What interventions are being tested in trial NCT03417440?
The interventions under investigation include: Physical Activity (PA) Tracker App (OTHER), On Your Feet (OTHER), Coach Me (OTHER), Proof Positive (OTHER).
Who is sponsoring clinical trial NCT03417440?
This trial is sponsored by University of Southern California, which has 617 total clinical trials registered on ClinicalTrials.gov.
Learn More About Clinical Trials
How this trial's enrollment target compares
Where NCT03417440's enrollment target sits among peer trials
111 816th of 2000 higher than 1,185 of 2,000 other NA trials
participants (enrollment target), bucketed by value
Each bar is a band; taller bars hold more other NA trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov registry export · 2026-08-08
Nationwide trials with similar profiles
Cross-condition peers matched on enrollment target and registry start date, not the same-condition list above.
Similar enrollment target
- NCT03875716 · 111 participants · NA
Study of De_Intensified Postoperative Radiation Therapy for HPV Associated Oropharyngeal Squamous Cell Carcinoma
- NCT04693468 · 111 participants · Phase 1
Talazoparib and Palbociclib, Axitinib, or Crizotinib for the Treatment of Advanced or Metastatic Solid Tumors, TalaCom Trial
- NCT05263050 · 111 participants · Phase 2
Trial of an Alternative Cabozantinib Dosing Schedule in Metastatic Renal Cell Carcinoma and Neuroendocrine Tumors
- NCT05600842 · 111 participants
De-escalated Radiation for Human Papillomavirus-Positive Squamous Cell Carcinoma of the Oropharynx
Similar registry start date
- NCT05962346 · started 2026-12 · NA
Fetal Endoscopic Tracheal Occlusion for Congenital Diaphragmatic Hernia
- NCT07125183 · started 2026-12 · Phase 2
Study on Efficacy and Tolerability of Weekly Doxorubicin in Elderly Patients With Advanced or Metastatic Leiomyosarcoma
- NCT07292298 · started 2026-11 · Phase 2
Phase 2 Single-Arm Rectal Cancer Brachytherapy for Patients With Low-Lying Residual Adenocarcinoma After Total Neoadjuvant Therapy to Improve Organ Preservation Rates
- NCT04263285 · started 2026-10 · NA
Treatment of Depression Post-SCI