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Can Intraindividual Variability in Cognitive Speed Be Reduced by Physical Exercise? Results From the LIFE Study

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  • Allison A M Bielak
  • Christopher R Brydges
  • Angela Gutchess

Abstract

Objectives Findings are mixed regarding the potential to improve older adults’ cognitive ability via training and activity interventions. One novel sensitive outcome may be intraindividual variability (IIV) in cognitive speed, or moment-to-moment changes in a person’s performance. The present article evaluated if participants who participated in a moderate physical activity intervention showed a reduction in IIV, compared with a successful aging education control group. MethodFor approximately 2.6 years, sedentary adults aged 70–90 years participated in the Lifestyle Interventions and Independence for Elders (LIFE) Study (n = 1,635), a multisite Phase 3 randomized controlled trial to reduce major mobility disability. They completed 4 reaction time tests at baseline and at approximately 24 months post-test. Results Analyses were conducted following both the intent-to-treat principle and complier average casual effect modeling. Results indicated that participants in the physical activity group did not show a reduction in their IIV. Discussion The lack of a significant reduction in IIV may be due to the mild nature of the physical activity program and the cognitively healthy sample. It is also possible that other types of lifestyle activity interventions (e.g., social and cognitive engagement) can elicit reductions in IIV for older adults.

Suggested Citation

  • Allison A M Bielak & Christopher R Brydges & Angela Gutchess, 2019. "Can Intraindividual Variability in Cognitive Speed Be Reduced by Physical Exercise? Results From the LIFE Study," The Journals of Gerontology: Series B, The Gerontological Society of America, vol. 74(8), pages 1335-1344.
    • Handle: RePEc:oup:geronb:v:74:y:2019:i:8:p:1335-1344.
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    File URL: http://hdl.handle.net/10.1093/geronb/gby101
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    Cited by:

    1. Shudong Tian & Hong Mou & Qun Fang & Xiaoxiao Zhang & Fanying Meng & Fanghui Qiu, 2021. "Comparison of the Sustainability Effects of High-Intensity Interval Exercise and Moderate-Intensity Continuous Exercise on Cognitive Flexibility," IJERPH, MDPI, vol. 18(18), pages 1-11, September.

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