Physical activity measurements affected participants' behavior in a randomized controlled trial

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

BACKGROUND AND OBJECTIVE: Assessing levels and determinants of physical activity as outcome measurements might have an independent effect on participant's physical activity behavior. The objective is to study this effect in a randomized controlled trial (RCT) promoting regular physical activity in Dutch general practice.

METHODS: Using a Solomon four-group design, participants were randomized twice. After randomization to a control or intervention-condition at general practice level (N = 29), participants were randomized to a group participating in measurements at baseline, 2 and 6 months (3M-group, N = 361), or a group only participating in measurements at 6 months (1M-group, N = 356). Outcome measures assessed at 6 months included: level of physical activity (self-reported and objectively measured with accelerometry), meeting ACSM/CDC guideline for regular physical activity, stage of change, and determinants of physical activity.

RESULTS: Follow-up data on 635 participants (89%) was collected. Statistically significant measurement effects were found for meeting the ACSM/CDC guideline (self-reported), self-efficacy for resisting relapse, knowledge, and on awareness. Other outcome measures showed positive trends, except stages of change.

CONCLUSION: Measurements of physical activity affect participant's physical activity behavior, possibly triggered by a raised awareness about their own physical activity level. Implications for future research are discussed, as well as methodologic limitations of the study design.

Original languageEnglish
Pages (from-to)404-11
Number of pages8
JournalJournal of Clinical Epidemiology
Volume59
Issue number4
DOIs
Publication statusPublished - Apr 2006

Cite this

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title = "Physical activity measurements affected participants' behavior in a randomized controlled trial",
abstract = "BACKGROUND AND OBJECTIVE: Assessing levels and determinants of physical activity as outcome measurements might have an independent effect on participant's physical activity behavior. The objective is to study this effect in a randomized controlled trial (RCT) promoting regular physical activity in Dutch general practice.METHODS: Using a Solomon four-group design, participants were randomized twice. After randomization to a control or intervention-condition at general practice level (N = 29), participants were randomized to a group participating in measurements at baseline, 2 and 6 months (3M-group, N = 361), or a group only participating in measurements at 6 months (1M-group, N = 356). Outcome measures assessed at 6 months included: level of physical activity (self-reported and objectively measured with accelerometry), meeting ACSM/CDC guideline for regular physical activity, stage of change, and determinants of physical activity.RESULTS: Follow-up data on 635 participants (89{\%}) was collected. Statistically significant measurement effects were found for meeting the ACSM/CDC guideline (self-reported), self-efficacy for resisting relapse, knowledge, and on awareness. Other outcome measures showed positive trends, except stages of change.CONCLUSION: Measurements of physical activity affect participant's physical activity behavior, possibly triggered by a raised awareness about their own physical activity level. Implications for future research are discussed, as well as methodologic limitations of the study design.",
keywords = "Adult, Aged, Awareness, Epidemiologic Methods, Family Practice, Female, Health Behavior, Health Promotion/methods, Humans, Male, Middle Aged, Motor Activity, Research Design, Self Efficacy, Treatment Outcome",
author = "{van Sluijs}, {Esther M F} and {van Poppel}, {Mireille N M} and Twisk, {Jos W R} and {van Mechelen}, Willem",
year = "2006",
month = "4",
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language = "English",
volume = "59",
pages = "404--11",
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Physical activity measurements affected participants' behavior in a randomized controlled trial. / van Sluijs, Esther M F; van Poppel, Mireille N M; Twisk, Jos W R; van Mechelen, Willem.

In: Journal of Clinical Epidemiology, Vol. 59, No. 4, 04.2006, p. 404-11.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - van Sluijs, Esther M F

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AU - Twisk, Jos W R

AU - van Mechelen, Willem

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N2 - BACKGROUND AND OBJECTIVE: Assessing levels and determinants of physical activity as outcome measurements might have an independent effect on participant's physical activity behavior. The objective is to study this effect in a randomized controlled trial (RCT) promoting regular physical activity in Dutch general practice.METHODS: Using a Solomon four-group design, participants were randomized twice. After randomization to a control or intervention-condition at general practice level (N = 29), participants were randomized to a group participating in measurements at baseline, 2 and 6 months (3M-group, N = 361), or a group only participating in measurements at 6 months (1M-group, N = 356). Outcome measures assessed at 6 months included: level of physical activity (self-reported and objectively measured with accelerometry), meeting ACSM/CDC guideline for regular physical activity, stage of change, and determinants of physical activity.RESULTS: Follow-up data on 635 participants (89%) was collected. Statistically significant measurement effects were found for meeting the ACSM/CDC guideline (self-reported), self-efficacy for resisting relapse, knowledge, and on awareness. Other outcome measures showed positive trends, except stages of change.CONCLUSION: Measurements of physical activity affect participant's physical activity behavior, possibly triggered by a raised awareness about their own physical activity level. Implications for future research are discussed, as well as methodologic limitations of the study design.

AB - BACKGROUND AND OBJECTIVE: Assessing levels and determinants of physical activity as outcome measurements might have an independent effect on participant's physical activity behavior. The objective is to study this effect in a randomized controlled trial (RCT) promoting regular physical activity in Dutch general practice.METHODS: Using a Solomon four-group design, participants were randomized twice. After randomization to a control or intervention-condition at general practice level (N = 29), participants were randomized to a group participating in measurements at baseline, 2 and 6 months (3M-group, N = 361), or a group only participating in measurements at 6 months (1M-group, N = 356). Outcome measures assessed at 6 months included: level of physical activity (self-reported and objectively measured with accelerometry), meeting ACSM/CDC guideline for regular physical activity, stage of change, and determinants of physical activity.RESULTS: Follow-up data on 635 participants (89%) was collected. Statistically significant measurement effects were found for meeting the ACSM/CDC guideline (self-reported), self-efficacy for resisting relapse, knowledge, and on awareness. Other outcome measures showed positive trends, except stages of change.CONCLUSION: Measurements of physical activity affect participant's physical activity behavior, possibly triggered by a raised awareness about their own physical activity level. Implications for future research are discussed, as well as methodologic limitations of the study design.

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KW - Middle Aged

KW - Motor Activity

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