Validating Machine -Learned Classifiers of Sedentary Behavior and Physical Activity (iWatch)

This study is currently recruiting participants. (see Contacts and Locations)
Verified March 2014 by University of California, San Diego
Sponsor:
Information provided by (Responsible Party):
Jacqueline Kerr, University of California, San Diego
ClinicalTrials.gov Identifier:
NCT01775826
First received: January 17, 2013
Last updated: March 13, 2014
Last verified: March 2014
  Purpose

The majority of the US population spends most of the day sitting and the we have new scientific evidence that this can contribute to poor health regardless of how much physical activity a person does. However, we do not measure sitting time very accurately and when we ask people to tell us how much they do, their answers are unreliable. Our study will use small sensors to objectively measure when people sit or do physical activity, and we will use sophisticated computational techniques to summarize these movement patterns.


Condition
Physical Activity
Sedentary Lifestyle

Study Type: Observational
Study Design: Observational Model: Cohort
Time Perspective: Cross-Sectional
Official Title: Validating Machine -Learned Classifiers of Sedentary Behavior and Physical Activity

Further study details as provided by University of California, San Diego:

Primary Outcome Measures:
  • physical activity behavior classification using study sensors (accelerometers, Sensecam and GPS) [ Time Frame: Baseline ] [ Designated as safety issue: No ]

    Using an annotated data set of SenseCam images in three free-living population subgroups, we will compare sensitivity, specificity and percent agreement between behavioral classifiers derived from: (a) single axis vs. multi axis accelerometers; (b) aggregated movement counts vs. raw acceleration data; (c) hip vs. wrist mounted accelerometers.

    Determine (a) the extent to which adding GPS data improves discrimination accuracy over accelerometer only behavior classification (i.e., best classifier resulting from Aim 1); and (b) the extent to which adding GIS data improves discrimination accuracy over accelerometer and GPS behavior classification alone (i.e., best classifier resulting from Aim 2a).



Estimated Enrollment: 210
Study Start Date: March 2013
Estimated Study Completion Date: April 2016
Estimated Primary Completion Date: April 2016 (Final data collection date for primary outcome measure)
Groups/Cohorts
Child and adolescent
6-17 years of age
Adult
18-55 years of age
Older adults
65-85 years of age

  Eligibility

Ages Eligible for Study:   6 Years to 85 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population

We will recruit 210 volunteer participants over a 2-yr period. Fifty percent of the sample will be women, and we will quota sample three specific age groups: 6-10 year olds (n = 70); 16-55 year olds (n=70); and 65-85 year olds (n= 70).

Criteria

Inclusion Criteria:

Inclusion Criteria for participants 6-17 yr olds:

  • provide written parental consent to complete study protocols;
  • provide verbal assent to complete study protocols;
  • willingness to complete 2 visits to UCSD offices;
  • willingness to wear multiple sensor devices on 7 days for 12 hours per day;
  • willingness to wear wrist accelerometer on 7 days for 24 hours per day;
  • willingness to have their height and weight measured;
  • be able to walk unassisted
  • able to read and understand study materials in English.

Inclusion Criteria for participants 18-55 yr old:

  • provide written consent to complete study protocols;
  • willingness to complete 2 visits to UCSD offices;
  • willingness to wear multiple sensor devices on 7 days for 12 hours per day;
  • willingness to wear wrist accelerometer on 7 days for 24 hours per day;
  • complete a survey assessing their demographic characteristics;
  • willingness to have their height and weight measured;
  • be physically and cognitively able to walk unassisted,
  • able to read and understand study materials in English.

Inclusion Criteria for participants 65-85 yr olds:

  • provide written consent to complete study protocols;
  • correctly answer verbal questions about their comprehension of the informed consent;
  • willingness to complete 2 visits to UCSD offices;
  • willingness to wear multiple sensor devices on 7 days for 12 hours per day;
  • willingness to wear wrist accelerometer on 7 days for 24 hours per day;
  • complete a survey assessing their demographic;
  • willingness to have their height and weight measured;
  • be physically and cognitively able to walk without the assistance of another person (walking aids are permitted)
  • able to read and understand study materials in English.

Exclusion Criteria:

  • unable to ambulate;
  • attends a workplace or school on monitoring days that prohibits static images being taken by a SenseCam worn around the neck of the participant;
  • pregnancy in second or third trimester.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01775826

Locations
United States, California
UCSD Recruiting
La Jolla, California, United States, 92093
Contact: Lindsay Dillon, MPH    858-534-9329    ldillon@ucsd.edu   
Principal Investigator: Jacqueline Kerr, PhD         
Sponsors and Collaborators
University of California, San Diego
  More Information

No publications provided

Responsible Party: Jacqueline Kerr, Assistant Professor, University of California, San Diego
ClinicalTrials.gov Identifier: NCT01775826     History of Changes
Other Study ID Numbers: 1R01CA164993-01A1
Study First Received: January 17, 2013
Last Updated: March 13, 2014
Health Authority: United States: Institutional Review Board
United States: Federal Government

Keywords provided by University of California, San Diego:
physical activity
sedentary behavior
accelerometer
GPS
GIS
machine learning

ClinicalTrials.gov processed this record on July 24, 2014