The CHAT (Community Health Advice by Telephone) Study

This study has been completed.
Information provided by:
National Institute on Aging (NIA) Identifier:
First received: August 8, 2005
Last updated: December 9, 2009
Last verified: December 2008

The purpose of the study is to compare a telephone-administered physical activity counseling program delivered by a person or by a telephone-linked computer system and test their relative benefits in improving regular physical activity among adults ages 55 and older.

Condition Intervention Phase
Health Behavior
Behavioral: The Stanford Active Choices program
Behavioral: The TLC system
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Single Blind
Official Title: Exercise Advice by Human or Computer: Testing 2 Theories

Resource links provided by NLM:

Further study details as provided by National Institute on Aging (NIA):

Primary Outcome Measures:
  • Increase in physical activity measured by the Stanford 7-Day Physical Activity Recall and the Community Healthy Activities Model Program for Seniors (CHAMPS) physical activity questionnaire for older adults

Secondary Outcome Measures:
  • Physical performance on a symptom-limited, graded exercise treadmill test
  • quality of life and psychological questionnaires measuring physical functioning, sleep, perceived stress, depressive symptoms

Estimated Enrollment: 225
Study Start Date: June 1999
Study Completion Date: December 2003
Primary Completion Date: December 2003 (Final data collection date for primary outcome measure)
Detailed Description:

Two hundred and twenty five healthy, sedentary men and women ages 55 and older will be randomly assigned to one of three conditions: 12 months of physical activity counseling delivered by a human counselor, 12 months of physical activity counseling delivered by a telephone-linked computer system, or a 12-month attention-control condition (a health education class). Data on physical activity participation and related quality of life indicators (e.g., improved physical functioning, fitness, sleep) will be collected at baseline, 6 months, 12 month post-test and 18 month follow-up. The primary hypotheses are:

  • participants in either physical activity counseling condition will show greater improvements in physical activity participation at 12 months compared to the attention-control condition;
  • participants in the human counselor condition will show greater improvements in physical activity at 12 months relative to the computer condition; and
  • participants in the computer condition will show better maintenance of physical activity between 12 and 18 months compared to participants in the human counselor condition.

Ages Eligible for Study:   55 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Men and women ages 55 and older
  • Free of any medical condition that would limit participation in independent exercise
  • Not currently engaged in a regular pattern of physical conditioning
  • Free of clinical psychopathology
  • Stable on current medications
  • Planning to remain in the geographic area through the duration of the trial
  • Able to read and speak English sufficiently to understand protocol materials
  • Can use the telephone unaided
  • Willing to accept random assignment to any study condition

Exclusion Criteria:

  • Under the age of 55
  • Currently under treatment for an acute, serious medical condition (e.g., cancer, heart disease, stroke)
  • Physically active on a regular basis (i.e. performing more than 60 minutes per week of aerobic physical activity of at least a moderate intensity)
  • Unstable and/or uncontrolled on medications for high blood pressure or depression
  • Unable or unwilling to use a telephone unaided
  • Unwilling to accept random assignment to study condition
  Contacts and Locations
Please refer to this study by its identifier: NCT00131092

United States, California
Stanford Prevention Research Center
Stanford, California, United States, 94305-5705
Sponsors and Collaborators
Principal Investigator: Abby C. King, PhD Stanford Prevention Research Center