Walkling Behavior Laboratory, Pennington Biomedical Research Center, Baton Rouge, LA 70808, USA.
Prev Med. 2011 Jul-Aug;53(1-2):31-3. doi: 10.1016/j.ypmed.2011.01.014. Epub 2011 Feb 2.
Physical activity (PA) guidelines are typically communicated in terms of duration, frequency and intensity, e.g., 30 min/day of moderate-to-vigorous physical activity (MVPA) on at least 5 days/week. Step counters can be used to collect objective PA expressed as steps/day, however the association between steps/day and recommended PA levels is unclear.
We determined a direct steps/day translation of 30 min/day accumulated MVPA, using concurrently detected ActiGraph accelerometer-defined step and activity count data collected as part of the 2005-2006 National Health and Nutrition Examination Survey (NHANES).
We employed statistical models to analyze data from 3523 participants 20+years of age who wore the accelerometer for at least one valid day (i.e., at least 10/24h) over 7 days.
30 min/day of MVPA translated to approximately 7900 steps/day for males and 8300 steps/day for females. In a subsample of participants (n=1197) with valid data on all 7 days, we found 150 min/week of MVPA translated to approximately 7000 steps/day (or 49,000 steps/week).
Accumulating approximately 8000 steps/day is a good proxy for 30 min of daily MVPA, while accumulating 7000 steps/day every day of the week is consistent with obtaining 150 min of weekly MVPA.
体力活动（PA）指南通常以持续时间、频率和强度来表示，例如，每周至少 5 天每天进行 30 分钟中等至剧烈体力活动（MVPA）。计步器可用于收集以每日步数表示的客观体力活动，但每日步数与推荐的体力活动水平之间的关系尚不清楚。
我们使用同时检测到的 ActiGraph 加速度计定义的步频和活动计数数据，确定了 30 分钟每天累计 MVPA 的直接每日步数转换值，这些数据是作为 2005-2006 年国家健康和营养检查调查（NHANES）的一部分收集的。
我们使用统计模型分析了年龄在 20 岁及以上、佩戴加速度计至少 1 天（即至少 10/24 小时）超过 7 天的 3523 名参与者的数据。
男性每天进行 30 分钟的 MVPA 相当于大约 7900 步/天，女性每天进行 30 分钟的 MVPA 相当于大约 8300 步/天。在有所有 7 天有效数据的参与者子样本（n=1197）中，我们发现每周 150 分钟的 MVPA 相当于大约 7000 步/天（或每周 49000 步）。
每天积累大约 8000 步是每天 30 分钟 MVPA 的良好替代指标，而每天积累 7000 步与每周获得 150 分钟 MVPA 一致。
