Dept of Kinesiology, Iowa State University, College of Human Sciences, Ames, IA.
J Phys Act Health. 2016 Jan;13(1):79-86. doi: 10.1123/jpah.2014-0543. Epub 2015 Apr 21.
Subjective measures of moderate and vigorous physical activity (MVPA) rely on relative intensity whereas objective measures capture absolute intensity; thus, fit individuals and unfit individuals may perceive the same activity differently.
Adults (N = 211) wore the SenseWear Armband (SWA) for 10 consecutive days to objectively assess sedentary time and MVPA. On day 8, participants completed the International Physical Activity Questionnaire (IPAQ) to subjectively assess sitting time and MVPA. Fitness was assessed via a maximal treadmill test, and participants were classified as unfit if the result was in the bottom tertile of the study population by sex or fit if in the upper 2 tertiles.
Overall, estimates of MVPA between the IPAQ and SWA were not significantly different (IPAQ minus SWA, 67.4 ± 919.1 MVPA min/wk, P = .29). However, unfit participants overestimated MVPA using the IPAQ by 37.3% (P = .02), but fit participants did not (P = .99). This between-group difference was due to overestimation, using the IPAQ, of moderate activity by 93.8 min/wk among the unfit individuals, but underestimation of moderate activity among the fit participants by 149.4 min/wk.
Subjective measures of MVPA using the IPAQ varied by fitness category; unfit participants overestimated their MVPA and fit participants accurately estimated their MVPA.
中高强度身体活动（MVPA）的主观测量依赖于相对强度，而客观测量则捕捉绝对强度；因此，健康个体和不健康个体可能对相同的活动有不同的感知。
成年人（N=211）连续佩戴 SenseWear 臂带（SWA）10 天，以客观评估久坐时间和 MVPA。在第 8 天，参与者完成了国际体力活动问卷（IPAQ），以主观评估久坐时间和 MVPA。通过最大跑步机测试评估健康状况，如果测试结果在性别上处于研究人群的底部三分之一，则参与者被归类为不健康，如果处于上两个三分之一，则为健康。
总体而言，IPAQ 和 SWA 之间的 MVPA 估计值没有显著差异（IPAQ 减去 SWA，67.4±919.1MVPA 分钟/周，P=0.29）。然而，不健康的参与者使用 IPAQ 高估了 MVPA37.3%（P=0.02），而健康的参与者没有（P=0.99）。这种组间差异是由于不健康个体对中度活动的 IPAQ 高估了 93.8 分钟/周，而健康个体对中度活动的 IPAQ 低估了 149.4 分钟/周。
使用 IPAQ 的 MVPA 的主观测量因健康状况而异；不健康的参与者高估了他们的 MVPA，而健康的参与者准确地估计了他们的 MVPA。
