Centre of Lifestyle Studies, School of Kinesiology, Acadia University, 15 University Ave., Wolfville, NS B4P 2R6, Canada.
Division of Kinesiology, School of Health and Human Performance, Dalhousie University, Halifax, NS B3H 4R2, Canada.
Int J Environ Res Public Health. 2018 Nov 3;15(11):2454. doi: 10.3390/ijerph15112454.
Adults are recommended to engage in 150 min of moderate (MPA) to vigorous (VPA) aerobic physical activity per week, with the public health message of obtaining 3000 steps in 30 min. There is a paucity of research on step rate thresholds that correspond to absolute MVPA (moderate = 3 METs, vigorous = 6 METs) with no research evaluating adult relative MVPA (moderate = 40% VO vigorous = 60% VO). Anthropometric differences also influence intensity-related step rate thresholds. The purpose of this study was to identify step rates across a range of walking intensities so that mathematical models incorporating anthropometric factors could be used to identify individualized MVPA step rate thresholds. Forty-three adults (25♀; age = 39.4 ± 15.2 years) completed a staged treadmill walking protocol with pedometers and indirect calorimetry: six-minutes at 2.4, 3.2, 4.0, 5.6, 6.4, 7.2 km/h. Mathematical modelling revealed absolute and relative MPA step rate thresholds of ~100 steps/minute (spm) and ~125 spm, respectively. VPA corresponded to step rates of ~133 spm and ~139 spm for absolute and relative thresholds respectively. The current public message of 3000 steps in 30 min is valid for absolute MPA. However, VPA is achieved at higher thresholds than previously reported, more than 130 spm for healthy adults.
建议成年人每周进行 150 分钟的中等强度（MPA）到剧烈强度（VPA）有氧运动，公众健康信息是在 30 分钟内获得 3000 步。关于与绝对中高强度身体活动（中强度=3 METs，高强度=6 METs）对应的步速阈值的研究很少，也没有研究评估成年人的相对中高强度身体活动（中强度=40%VO2，高强度=60%VO2）。人体测量学差异也会影响与强度相关的步速阈值。本研究的目的是确定一系列步行强度下的步速，以便可以使用包含人体测量因素的数学模型来确定个体化的中高强度身体活动步速阈值。43 名成年人（25 名女性；年龄=39.4±15.2 岁）使用计步器和间接测热法完成了一个分阶段的跑步机步行方案：6 分钟 2.4、3.2、4.0、5.6、6.4、7.2 公里/小时。数学模型显示，绝对和相对 MPA 的步速阈值分别约为 100 步/分钟（spm）和 125 spm。VPA 对应的步速阈值分别为绝对和相对阈值的约 133 spm 和 139 spm。目前 30 分钟 3000 步的公众信息对于绝对 MPA 是有效的。然而，与之前报道的相比，VPA 达到更高的阈值，对于健康成年人来说，超过 130 spm。
