America Walks: An Observational Study of Walking Behavior Based on Passive Step Tracking

Study Overview
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Brief Summary
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America Walks is an observational research study to determine walking behavior of individuals in the United States. The entire study will be conducted virtually by requiring participants to download a mobile phone application (App), The App will leverage the mobile phone's step count sensor technology to automatically determine participants' daily walking activity. Participation is voluntary. Participants can choose not to participate or choose to participate and then stop participating. Participants decision will not result in any penalty or loss of benefits to which they are entitled.

Detailed Description
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This will be the first study to measure walking activity using mobile phones. It is well known that physical activity can promote well-being and help prevent several chronic diseases. It is recommended that an individual should do moderate to vigorous walking for 30 minutes or walk approximately 10,000 steps everyday. Several studies have reported measuring walking activity using self-reported surveys, or pedometers in samples ranging from a dozen to a couple of thousand participants. However these studies have largely required participants to enter their walking data manually, either from memory or from pedometer recordings. With the rapid availability of activity sensors embedded in smart-phones (such as Apple's iPhone version 5S and up and several Google's Android phone models), it is now possible to track physical activity data passively from the end-user and do so for longer durations as individuals have increasingly begun to use their Phones as a continuous device of use.

Official Title
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America Walks: An Observational Study of Walking Behavior Based on Passive Step Tracking Using a Mobile Phone Application

Conditions
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Healthy

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Be at-least 18 years old (self -reported) Must reside in the United States (50 states and the District of Columbia); this will be self reported by the participant by entering a zip code which will be checked for valid US zip codes. Exclusion Criteria: Does not have a device that supports Apple HealthKit (iPhone 5s or above) or doesn't not have an Android phone with step count sensors

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Total step count | This is the total step count from enrollment onwards till user completes 30 days, or quits or till end of study (if the participant continues after 30 days) | 30 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Average daily step count (baseline, study) | This will be obtained by averaging the step count data 30 days before enrollment and for the 30 days of the study. | 30 days | 
| Correlation between perception and actual walking | Calculate the correlation between perceived walking activity as measured by survey items and walking activity as determined by the number of actual steps walked | 4 months | 
| Total step count (baseline) | The total step count collected from the history on the device (if supported) obtained by the step count data of 30 days before enrollment | 30 days | 
| Standard Deviation of step count |  | 4 months | 
| Ranking of cities by daily Average step count | All participants will be grouped by their location and location averages will be ranked | 4 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Fitness, Health kit, Researchkit, Walking