EMGO Institute, Department of Public and Occupational Health, Body@Work Research Center Physical Activity, Work and Health, TNO-VU University Medical Center, Amsterdam, The Netherlands.
Int J Behav Nutr Phys Act. 2009 Mar 25;6:17. doi: 10.1186/1479-5868-6-17.
The purpose of this study is to compare self-reported time (by questionnaire) and objectively measured time (by accelerometer) spent on physical activity at moderate (MPA) and vigorous intensity (VPA) in subgroups of age, gender, education and weight status.
In total, 236 adolescents (aged 12-18) and 301 adults (aged 22-40), completed the questionnaire and wore an accelerometer for two weeks.
Adolescents reported exceptionally more time spent on MPA (mean difference 596 +/- 704 min/wk) and VPA (mean difference 178 +/- 315 min/wk) than was assessed objectively by the accelerometer. Based on the questionnaire, high educated adolescents spent more time on MPA (205 min/wk, p = 0.002) and VPA (120 min/wk, p = 0.01) than low educated adolescents, but according to the accelerometer they spent less time on MPA (149 min/wk, p = 0.001) and VPA (47 min/wk, p = 0.001). Among adults there was moderate agreement between self-reported time and objectively measured time spent on MPA, but in general the reported time spent on MPA (mean difference 107 +/- 334 min/wk) and VPA (mean difference 169 +/- 250 min/wk) exceeded the time measured with the accelerometer. Overweight adults reported significantly more VPA (57 min/wk, p = 0.04) than normal weight adults, but this was not confirmed by the accelerometer data.
We observed large differences in time spent on MPA and VPA measured by questionnaire and accelerometer in adolescents but reasonably good agreement in adults. Differences between methods varied by gender, education and weight status. This finding raises serious questions about the use of questionnaires to quantify MPA and VPA in adolescents. There is a clear need in advanced valid assessments of PA in adolescents.
ISRCTN93896459.
本研究旨在比较通过问卷自我报告的时间（通过问卷）和通过加速度计客观测量的时间（通过加速度计），以评估青少年和成年人在不同年龄、性别、教育程度和体重状况亚组中进行中等强度（MPA）和剧烈强度（VPA）身体活动的时间。
共有 236 名青少年（年龄 12-18 岁）和 301 名成年人（年龄 22-40 岁）完成了问卷并佩戴加速度计两周。
青少年报告的 MPA（平均差异 596 +/- 704 分钟/周）和 VPA（平均差异 178 +/- 315 分钟/周）时间明显高于加速度计的客观评估。根据问卷，高学历青少年在 MPA（205 分钟/周，p = 0.002）和 VPA（120 分钟/周，p = 0.01）上花费的时间多于低学历青少年，但根据加速度计，他们在 MPA（149 分钟/周，p = 0.001）和 VPA（47 分钟/周，p = 0.001）上花费的时间较少。在成年人中，自我报告时间与客观测量的 MPA 时间之间存在中度一致性，但总体而言，报告的 MPA（平均差异 107 +/- 334 分钟/周）和 VPA（平均差异 169 +/- 250 分钟/周）时间超过了加速度计测量的时间。超重成年人报告的 VPA（57 分钟/周，p = 0.04）明显多于正常体重成年人，但这一结果与加速度计数据不一致。
我们观察到青少年通过问卷和加速度计测量的 MPA 和 VPA 时间存在较大差异，但成年人之间的一致性较好。方法之间的差异因性别、教育程度和体重状况而异。这一发现对使用问卷来量化青少年的 MPA 和 VPA 提出了严重质疑。因此，非常有必要对青少年的 PA 进行更先进的有效性评估。
ISRCTN93896459。
