Polytechnic Institute of Bragança , Department of Sport Sciences, Bragança, Portugal ; Research Centre in Sports, Health and Human Development, Vila Real, Portugal.
J Sports Sci Med. 2009 Dec 1;8(4):616-21. eCollection 2009.
i) to develop a regression equation to estimate metabolic equivalent (MET) in walk/run by heart rate increment above rest (NetHR), and; ii) to determine NetHR thresholds for light, moderate, and vigorous physical activity (PA), from middle aged to elderly. Sample 1 (prediction sample) comprised 39 subjects (19 male and 20 female), with 58.2 ± 11.0 years old. Sample 2 (validation sample) comprised 40 subjects (18 male and 22 female) with 63.3 ± 7.0 years old. Each participant did the following activities in sequence, a 15min rest period in supine position, walk at 3km/h, walk at 4.5km/h, and walk at 6km/h, for 6 min at each walk velocity interval. The oxygen up-take (VO2) and heart rate (HR) were continuously and simultaneously assessed. A hierarchical linear model was used to analyze the relationship between metabolic equivalent (MET) and NetHR. The regression equation for MET prediction was: MET = 1.265780 + 0.109479 NetHR. The NetHR thresholds (upper limit) for light, moderate and vigorous PA were 16 and 35 and 70 bpm, respectively. NetHR is a practical, valid and non-invasive method to prescribe physical activity, taking in account individual characteristics (HR at rest combined with NetHR) in middle-aged to older adults. Key pointsPhysical activity intensity can be prescribed by NetHR, in middle aged to older active adults.NetHR thresholds (upper limit) for light (<3 MET), moderate (3 to 6 MET) and vigorous (6 to 9 MET) PA were respectively 17, 43 and 67 bpm.WE CAN ESTIMATE MET INTENSITY LEVEL BY EQUATION: MET = 1.265780 + 0.109479 .NetHR.
（一）建立一个回归方程，通过静息心率增量（NetHR）来估算步行/跑步时的代谢当量（MET）；（二）确定从中年到老年人群中，轻、中、高强度体力活动（PA）的 NetHR 阈值。样本 1（预测样本）包括 39 名受试者（男性 19 名，女性 20 名），年龄为 58.2±11.0 岁。样本 2（验证样本）包括 40 名受试者（男性 18 名，女性 22 名），年龄为 63.3±7.0 岁。每位参与者按以下顺序进行活动：先在仰卧位休息 15 分钟，然后以 3km/h 的速度行走，再以 4.5km/h 和 6km/h 的速度行走，每个步行速度间隔持续 6 分钟。持续同步评估耗氧量（VO2）和心率（HR）。使用层次线性模型分析代谢当量（MET）和 NetHR 之间的关系。MET 预测的回归方程为：MET=1.265780+0.109479 NetHR。轻、中、高强度 PA 的 NetHR 阈值（上限）分别为 16、35 和 70 bpm。NetHR 是一种实用、有效且非侵入性的方法，可根据个体特征（静息心率与 NetHR 的组合）为中年及以上成年人制定体力活动方案。关键点：1. 可通过 NetHR 为中年至老年活跃成年人制定体力活动强度。2. 轻（<3 MET）、中（3 至 6 MET）和重（6 至 9 MET）PA 的 NetHR 阈值（上限）分别为 17、43 和 67 bpm。3. 我们可以通过方程：MET=1.265780+0.109479 NetHR 来估计 MET 强度水平。4. NetHR。
