Convergent validity of six methods to assess physical activity in daily life
Convergent validity of six methods to assess physical activity in daily life
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DOI：
10.1152/japplphysiol.00336.2006
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发表时间：
2006-11-01
影响因子：
3.3
通讯作者：
Chan, Dionise
中科院分区：
文献类型：
--
作者：
Macfarlane, Duncan J.;Lee, Cherry C. Y.;Chan, Dionise
其目的是检查协议（收敛有效性）之间的六种常见措施的习惯性体力活动，以估计持续时间的轻，中度，剧烈，和总的活动范围内的自由生活的个人。在连续7天内，49名中国人（30名男性，19名女性），年龄15-55岁，佩戴Polar心率监测器，单轴MTI和三轴Tritrac加速计，加上Yamax计步器>= 600分钟/天。他们还完成了每日体力活动日志，并在第8天完成了7天国际体力活动问卷的中文版。在每一级活动中，两种测力计衍生仪器和两种加速度计衍生仪器之间的一致性很好，但不同仪器之间的差异很大，通常可以看到平均持续时间的两到四倍差异。与其他所有测量方法相比，心率监测器高估了轻度活动，低估了中度活动。在大多数活动测量中，斯皮尔曼相关系数为低至中等（0.2-0.5），计步器与总活动的相关性通常优于其他运动传感器的上级。我们的结论是，使用普遍接受的临界点定义轻，中度，剧烈，和总的活动，几乎没有收敛的有效性跨仪器是显而易见的，这表明这些措施是采样不同水平的习惯性体力活动和护理时，需要比较他们的结果。为了在不同的人之间，在不同的研究中，或根据公认的身体活动促进指南，提供更稳定的活动比较，需要进一步的工作来微调一系列常见活动监测器的不同临界点，以在自由生活条件下提供更一致的结果。
The purpose was to examine the agreement (convergent validity) between six common measures of habitual physical activity to estimate durations of light, moderate, vigorous, and total activity in a range of free-living individuals. Over 7 consecutive days, 49 ethnic Chinese (30 men, 19 women), aged 15-55 yr, wore a Polar heart rate monitor, a uniaxial MTI, and triaxial Tritrac accelerometer, plus a Yamax pedometer for >= 600 min/day. They also completed a daily physical activity log and on day 8 a Chinese version of the 7-day International Physical Activity Questionnaire. At each level of activity, there was good agreement between the two questionnaire-derived instruments and the two accelerometry-derived instruments, but wide variation across different instruments, with two- to fourfold differences in mean durations often seen. The heart rate monitor overestimated light activity and underestimated moderate activity compared with all other measures. Spearman correlation coefficients were low to moderate (0.2-0.5) across most measures of activity, with the pedometer showing correlations with total activity that were often superior to the other movement sensors. We conclude that, with the use of commonly accepted cut points for defining light, moderate, vigorous, and total activity, little convergent validity across the instruments was evident, suggesting these measures are sampling different levels of habitual physical activity and care is needed when comparing their results. To provide a more stable comparison of activity among different people, across studies, or against accepted physical activity promotion guidelines, further work is needed to fine tune the different cut points across a range of common activity monitors to provide more consistent results during free-living conditions.