Department of Psychiatry, Massachusetts General Hospital, 55 Fruit St, Boston, MA, 02114, USA.
Department of Psychiatry, Harvard Medical School, Boston, MA, 02215, USA.
Int J Behav Med. 2021 Dec;28(6):834-839. doi: 10.1007/s12529-021-09966-0. Epub 2021 Feb 11.
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.
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.
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.
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.
ClinicalTrials.gov identifiers NCT03150199 and NCT03001999.
本初步研究旨在检验在身体活动干预的最初几周内，每日步数的增加和每日步数的日常一致性是否能预测结果。
这是两项同时进行的研究的二次分析，旨在测试积极心理学-动机性访谈干预措施，以增加 2 型糖尿病患者的身体活动量和积极情绪。在研究评估（基线、治疗结束和 8 周随访）时使用加速度计测量步数，并通过参与者使用提供的计步器在整个干预过程中每日测量步数。我们使用最佳拟合回归线计算从干预第 1 周到第 3 周的步数变化，以及前 3 周内每日步数的变化，使用最佳拟合回归线来衡量它们的变化。多元回归分析测试了这些预测因素是否与治疗结束时和 8 周随访时的身体活动变化有关。此外，我们还使用最小 p 值方法探索了特定截定点（例如 500 步）对早期步数变化的实用价值。
在 52 名参与者中，第 3 周时步数增加较大预测了治疗结束和随访时的活动增加。早期步数的变化与结果无关。早期增加 500 步和 2000 步的截定点可能具有实际意义。
身体活动干预的早期反应似乎是一个有用的结果预测指标，可以用于在治疗早期识别那些不太可能在特定干预中取得成功的人。
ClinicalTrials.gov 标识符 NCT03150199 和 NCT03001999。
