Cadence (steps/min) and intensity during ambulation in 6-20 year olds: the CADENCE-kids study.
Cadence (steps/min) and intensity during ambulation in 6-20 year olds: the CADENCE-kids study.
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DOI：
10.1186/s12966-018-0651-y
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发表时间：
2018-02-26
期刊：
影响因子：
--
通讯作者：
Johnson WD
中科院分区：
文献类型：
--
作者：
Tudor-Locke C;Schuna JM Jr;Han H;Aguiar EJ;Larrivee S;Hsia DS;Ducharme SW;Barreira TV;Johnson WD
步数/天被广泛用于估计活动总量，但它不能直接反映强度，这是公共卫生指南的核心原则。步数(步数/分钟)是描述活动强度的一个被忽视的机会。我们试图在6-20岁的儿童中建立将直接观察到的节奏与客观测量的强度联系起来的阈值。120名参赛者在跑步机上完成了多次5分钟的比赛，从13.4万米/分钟(0.8公里/小时)到134.0米/分钟(8.04万公里/小时)。当参与者自然过渡到跑步，或者如果他们选择不继续时，该方案被终止。使用便携式代谢系统对步数进行目测，并客观测量强度。计算6-17岁青年代谢物当量，中等强度定义为≥4和 6，剧烈强度定义为≥6 METy。传统的METS计算对象为18-20岁，中等强度定义为≥3和 6 METS，剧烈强度定义为≥6 METS。使用分段随机系数模型和受试者工作特征(ROC)曲线确定了中等强度和剧烈强度的最佳节奏阈值。参与者的平均年龄(±SD)为13.1 ± 4.3岁，体重为55.8 ± 22.3公斤，体重指数z得分为0.58 ± 1.21。中等强度阈值(回归和ROC分析)从6-8岁的128.4步/分钟到18-20岁的87.3步/分钟。剧烈运动强度的可比值从6-8岁的157.7步/分钟到18-20岁的119.3步/分钟。同时考虑回归和ROC方法，启发式节奏阈值(即基于证据的、实用的、四舍五入的)范围为125-90步/分钟(中等强度)，155-125步/分钟(剧烈强度)，较年轻年龄组的节奏较高。这些启发式阈值的灵敏度和特异度在77.8%到99.0%之间，表明分类精度一般到很好。这些启发式节奏阈值可用于在公共卫生建议中规定体力活动强度。在研究和临床背景下，这些启发式节奏阈值对于基于加速计的分析方法确定步行活动的强度具有明显的价值。本文的在线版本(10.1186/s12966-0180651-y)包含向授权用户提供的补充材料。
Steps/day is widely utilized to estimate the total volume of ambulatory activity, but it does not directly reflect intensity, a central tenet of public health guidelines. Cadence (steps/min) represents an overlooked opportunity to describe the intensity of ambulatory activity. We sought to establish thresholds linking directly observed cadence with objectively measured intensity in 6–20 year olds. One hundred twenty participants completed multiple 5-min bouts on a treadmill, from 13.4 m/min (0.80 km/h) to 134.0 m/min (8.04 km/h). The protocol was terminated when participants naturally transitioned to running, or if they chose to not continue. Steps were visually counted and intensity was objectively measured using a portable metabolic system. Youth metabolic equivalents (METy) were calculated for 6–17 year olds, with moderate intensity defined as ≥4 and < 6 METy, and vigorous intensity as ≥6 METy. Traditional METs were calculated for 18–20 year olds, with moderate intensity defined as ≥3 and < 6 METs, and vigorous intensity defined as ≥6 METs. Optimal cadence thresholds for moderate and vigorous intensity were identified using segmented random coefficients models and receiver operating characteristic (ROC) curves. Participants were on average (± SD) aged 13.1 ± 4.3 years, weighed 55.8 ± 22.3 kg, and had a BMI z-score of 0.58 ± 1.21. Moderate intensity thresholds (from regression and ROC analyses) ranged from 128.4 steps/min among 6–8 year olds to 87.3 steps/min among 18–20 year olds. Comparable values for vigorous intensity ranged from 157.7 steps/min among 6–8 year olds to 119.3 steps/min among 18–20 year olds. Considering both regression and ROC approaches, heuristic cadence thresholds (i.e., evidence-based, practical, rounded) ranged from 125 to 90 steps/min for moderate intensity, and 155 to 125 steps/min for vigorous intensity, with higher cadences for younger age groups. Sensitivities and specificities for these heuristic thresholds ranged from 77.8 to 99.0%, indicating fair to excellent classification accuracy. These heuristic cadence thresholds may be used to prescribe physical activity intensity in public health recommendations. In the research and clinical context, these heuristic cadence thresholds have apparent value for accelerometer-based analytical approaches to determine the intensity of ambulatory activity. The online version of this article (10.1186/s12966-018-0651-y) contains supplementary material, which is available to authorized users.
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DOI：
10.1001/jama.2014.732
发表时间：
2014-02-26
期刊：
JAMA
影响因子：
--
作者：
Ogden CL;Carroll MD;Kit BK;Flegal KM
通讯作者：
Flegal KM
影响因子：
3.1
作者：
Abel, Mark;Hannon, James;Beighle, Aaron
通讯作者：
Beighle, Aaron
影响因子：
3.9
作者：
Meppelink, Corine S.;Smit, Edith G.;van Weert, Julia C. M.
通讯作者：
van Weert, Julia C. M.
影响因子：
4.9
作者：
METZ, CE
通讯作者：
METZ, CE
影响因子：
1.8
作者：
Ford, Paul;Bailey, Richard;Swaine, Ian
通讯作者：
Swaine, Ian