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Purpose <p>Few studies assess how well the Theory of Planned Behavior (TPB) predicts physical activity over time after a breast cancer diagnosis. This study evaluated TPB’s prediction, measured at diagnosis, on women’s physical activity 1 year later.</p> Methods <p>The Alberta Moving Beyond Breast Cancer (AMBER) study follows women recently diagnosed with breast cancer (<i>n</i> = 1528; average age 55.4). Participants completed questionnaires on TPB variables about recreational activity shortly after diagnosis. At 1 year, actiGraph GT3X+® devices measured light and moderate-vigorous activity, and self-reported activity over the past year was assessed with the Past Year Total Physical Activity Questionnaire. Structural equation models evaluated TPB variables’ ability to predict physical activity after 1 year.</p> Results <p>At diagnosis, positive attitudes (<i>β</i> = 0.51; <i>p</i> &lt; 0.001) and greater perceived behavioral control (<i>β</i> = 0.16; <i>p</i> &lt; 0.001) were associated with greater intentions for physical activity derived from device-measured (<i>R</i><sup><i>2</i></sup> = 0.51, <i>p</i> &lt; 0.001) and self-reported questionnaire (<i>R</i><sup><i>2</i></sup> = 0.54, <i>p</i> &lt; 0.001). The TPB at diagnosis was associated with greater device-measured MVPA at 1 year (<i>β</i> = 0.13; <i>p</i> &lt; 0.01). The TPB was not associated with device-measured light-intensity physical activity (<i>β</i> = 0.07; <i>p</i> = 0.08) or self-reported recreational physical activity (<i>β</i> = 0.08; <i>p</i> = 0.07).</p> Conclusion <p>The variance explained by the TPB for physical activity at 1 year after breast cancer diagnosis was minimal. These findings highlight the need to identify additional factors influencing intentions and long-term activity.</p> Implications for Cancer Survivors <p>Incorporating behavior change strategies that influence attitudes toward physical activity may positively impact intentions at diagnosis. To ensure long-term activity among breast cancer survivors, supportive care should include interventions addressing factors beyond initial intentions.</p>

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Predictive ability of the theory of planned behavior on physical activity in newly diagnosed women with breast cancer: a prospective cohort study

  • 期刊论文

  • 发表日期：

    2025年11月27日

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  • Chad W. Wagoner,
  • Christine M. Friedenreich,
  • Kerry S. Courneya,
  • Qinggang Wang,
  • Jeff K. Vallance,
  • Charles E. Matthews,
  • Lin Yang,
  • Margaret L. McNeely,
  • Leanne Dickau,
  • S. Nicole Culos-Reed

摘要

Purpose

Few studies assess how well the Theory of Planned Behavior (TPB) predicts physical activity over time after a breast cancer diagnosis. This study evaluated TPB’s prediction, measured at diagnosis, on women’s physical activity 1 year later.

Methods

The Alberta Moving Beyond Breast Cancer (AMBER) study follows women recently diagnosed with breast cancer (n = 1528; average age 55.4). Participants completed questionnaires on TPB variables about recreational activity shortly after diagnosis. At 1 year, actiGraph GT3X+® devices measured light and moderate-vigorous activity, and self-reported activity over the past year was assessed with the Past Year Total Physical Activity Questionnaire. Structural equation models evaluated TPB variables’ ability to predict physical activity after 1 year.

Results

At diagnosis, positive attitudes (β = 0.51; p < 0.001) and greater perceived behavioral control (β = 0.16; p < 0.001) were associated with greater intentions for physical activity derived from device-measured (R2 = 0.51, p < 0.001) and self-reported questionnaire (R2 = 0.54, p < 0.001). The TPB at diagnosis was associated with greater device-measured MVPA at 1 year (β = 0.13; p < 0.01). The TPB was not associated with device-measured light-intensity physical activity (β = 0.07; p = 0.08) or self-reported recreational physical activity (β = 0.08; p = 0.07).

Conclusion

The variance explained by the TPB for physical activity at 1 year after breast cancer diagnosis was minimal. These findings highlight the need to identify additional factors influencing intentions and long-term activity.

Implications for Cancer Survivors

Incorporating behavior change strategies that influence attitudes toward physical activity may positively impact intentions at diagnosis. To ensure long-term activity among breast cancer survivors, supportive care should include interventions addressing factors beyond initial intentions.