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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 Healthy Behavioral: The Stanford Active Choices program Behavioral: The TLC system Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single
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   (Adult, Senior)
Sexes Eligible for Study:   All
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
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 identifier: NCT00131092

United States, California
Stanford Prevention Research Center
Stanford, California, United States, 94305-5705
Sponsors and Collaborators
National Institute on Aging (NIA)
Principal Investigator: Abby C. King, PhD Stanford Prevention Research Center