Strath S J, Swartz A M, Bassett D R, O'Brien W L, King G A, Ainsworth B E
Department of Exercise Science and Sport Management, University of Tennessee, Knoxville 37996, USA.
Med Sci Sports Exerc. 2000 Sep;32(9 Suppl):S465-70. doi: 10.1097/00005768-200009001-00005.
To further develop our understanding of the relationship between habitual physical activity and health, research studies require a method of assessment that is objective, accurate, and noninvasive. Heart rate (HR) monitoring represents a promising tool for measurement because it is a physiological parameter that correlates well with energy expenditure (EE). However, one of the limitations of HR monitoring is that training state and individual HR characteristics can affect the HR-VO2 relationship.
The primary purpose of this study was to examine the relationship between HR (beats x min(-1)) and VO2 (mL x kg(-1 x -1) min(-1)) during field- and laboratory-based moderate-intensity activities. In addition, we examined the validity of estimating EE from HR after adjusting for age and fitness. This was done by expressing the data as a percent of heart rate reserve (%HRR) and percent of VO2 reserve (%VO2R).
Sixty-one adults (18-74 yr) performed physical tasks in both a laboratory and field setting. HR and VO2 were measured continuously during the 15-min tasks. Mean values over min 5-15 were used to perform linear regression analysis on HR versus VO2. HR data were then used to predict EE (METs), using age-predicted HRmax and estimated VO2max.
The correlation between HR and VO2 was r = 0.68, with HR accounting for 47% of the variability in VO2. After adjusting for age and fitness level, HR was an accurate predictor of EE (r = 0.87, SEE = 0.76 METs).
This method of analyzing HR data could allow researchers to more accurately quantify physical activity in free-living individuals.
为了进一步加深我们对习惯性身体活动与健康之间关系的理解，研究需要一种客观、准确且无创的评估方法。心率（HR）监测是一种很有前景的测量工具，因为它是一个与能量消耗（EE）密切相关的生理参数。然而，HR监测的局限性之一是训练状态和个体HR特征会影响HR与摄氧量（VO₂）的关系。
本研究的主要目的是检验在野外和实验室进行的中等强度活动期间心率（次/分钟）与VO₂（毫升/千克⁻¹·分钟⁻¹）之间的关系。此外，我们在调整年龄和健康状况后，检验了根据心率估算EE的有效性。这是通过将数据表示为心率储备百分比（%HRR）和VO₂储备百分比（%VO₂R）来完成的。
61名成年人（18 - 74岁）在实验室和野外环境中进行身体任务。在15分钟的任务期间连续测量HR和VO₂。使用第5 - 15分钟的平均值对HR与VO₂进行线性回归分析。然后使用年龄预测的HRmax和估算的VO₂max，利用HR数据预测EE（代谢当量）。
HR与VO₂之间的相关性为r = 0.68，HR解释了VO₂变异性的47%。在调整年龄和健康水平后，HR是EE的准确预测指标（r = 0.87，标准误 = 0.76代谢当量）。
这种分析HR数据的方法可以使研究人员更准确地量化自由生活个体的身体活动。
