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. 2021 Dec;28(6):834-839.
doi: 10.1007/s12529-021-09966-0. Epub 2021 Feb 11.

Increase in Daily Steps During the Early Phase of a Physical Activity Intervention for Type 2 Diabetes as a Predictor of Intervention Outcome

Emily H Feig  1   2 , Lauren E Harnedy  3 , Christopher M Celano  3   4 , Jeff C Huffman  3   4
Affiliations

Increase in Daily Steps During the Early Phase of a Physical Activity Intervention for Type 2 Diabetes as a Predictor of Intervention Outcome

Emily H Feig et al. Int J Behav Med. 2021 Dec.

Abstract

Background: This pilot study aimed to test whether increase in daily steps and day-to-day consistency in daily steps during the first several weeks of a physical activity intervention predicted outcomes.

Methods: This was a secondary analysis from two concurrent studies testing a positive psychology-motivational interviewing intervention to increase physical activity and positive affect in individuals with type 2 diabetes. Steps were measured with accelerometers at study assessments (baseline, end-of-treatment, and 8-week follow-up) and were measured daily throughout the intervention by participants using provided pedometers. We calculated change in steps from intervention week 1 to week 3, along with variability in daily steps over the first 3 weeks, using the best fitting regression line modeling their change. Multiple regression analyses tested whether these predictors were associated with change in physical activity at the end of treatment and at 8-week follow-up. Additionally, we explored the utility of specific cutoffs (e.g., 500 steps) for early step change using a minimum p-value approach.

Results: In 52 participants, larger step increases by week 3 predicted activity increase at end-of-treatment and follow-up. Variability in early steps was not associated with outcomes. Early increase cutoffs of 500 and 2000 steps may have practical relevance.

Conclusion: Early response to a physical activity intervention appears to be a useful predictor of outcome and could be used to identify those unlikely to succeed in a given intervention early in treatment.

Trial registration: ClinicalTrials.gov identifiers NCT03150199 and NCT03001999.

Keywords: Behavioral intervention; Physical activity; Positive psychology; Type 2 diabetes.

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Conflict of interest statement

Conflict of Interest: The authors declare that they have no conflict of interest.

Figures

Figure 1.
Figure 1.
Example participants with a low (left) and high (right) daily step variability. RMSE = root mean square error.
Figure 2.
Figure 2.
Mean (standard error) accelerometer-measured steps per day by early step increase cutoffs.
See this image and copyright information in PMC

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