Department of Sport Sciences, University of the Pacific, Stockton, California, USA.
J Strength Cond Res. 2011 Feb;25(2):504-10. doi: 10.1519/JSC.0b013e3181b62c43.
The purposes of this study were to (a) determine if the mathematical model that has previously been used to estimate the critical power (CP) was applicable to heart rate (HR) to estimate the critical heart rate (CHR), and (b) compare the CHR to the HR values at the CP (CP(HR)), ventilatory threshold (VT(HR)), and respiratory compensation point (RCP(HR)). Fifteen women (mean age ± SD = 21.7 ± 2.1 years) performed an incremental test to exhaustion to determine VO₂peak, VT(HR), and RCP(HR). The subjects also performed 4 exhaustive workbouts at different power outputs for the determination of CP and CHR. For each power output, the total number of heart beats (HB(lim)) was calculated as the product of the average 5-second HR (bpm) and total time to exhaustion (T(lim) in minutes). The HB(lim) and total work (W(lim) in kilograms-meters) were plotted as a function of the T(lim) at each power output, and the slope coefficients of the regression lines between HB(lim) or W(lim) and T(lim) were defined as the CHR and CP, respectively. A 1-way repeated-measures analysis of variance (ANOVA) indicated that CHR (172 ± 11 bpm, 92.9 ± 2.7%HRmax) was similar to RCP(HR) (172 ± 9 bpm, 92.9 ± 2.2%HRmax) but was higher (p < 0.05) than CP(HR) (154 ± 10 bpm, 83.2 ± 4.0%HRmax) and VT(HR) (152 ± 12 bpm, 82.1 ± 4.3%HRmax). The relationship between HR and T(lim) from the CHR test can be described by the CP model. The CHR test may be a practical method for estimating RCP without the need to measure expired gas samples. Furthermore, like the RCP, the CHR test may be used to demarcate the heavy from severe exercise intensity domains, predict endurance exercise performance, and prescribe a training intensity for competitive cyclists.
(a) 确定先前用于估计最大功率输出（CP）的数学模型是否适用于心率（HR）来估计临界心率（CHR）；(b) 比较 CHR 与 CP（CP（HR））、通气阈（VT（HR））和呼吸补偿点（RCP（HR））时的 HR 值。15 名女性（平均年龄±标准差=21.7±2.1 岁）进行了递增至力竭的测试，以确定 VO₂peak、VT（HR）和 RCP（HR）。受试者还在不同的功率输出下进行了 4 次力竭工作，以确定 CP 和 CHR。对于每个功率输出，总心跳数（HB（lim））计算为平均 5 秒 HR（bpm）与力竭时间（T（lim）以分钟为单位）的乘积。HB（lim）和总功（W（lim）以千克-米为单位）作为每个功率输出的 T（lim）的函数进行绘制，HB（lim）或 W（lim）与 T（lim）之间的回归线的斜率系数分别定义为 CHR 和 CP。单向重复测量方差分析（ANOVA）表明，CHR（172±11bpm，92.9±2.7%HRmax）与 RCP（HR）（172±9bpm，92.9±2.2%HRmax）相似，但高于 CP（HR）（154±10bpm，83.2±4.0%HRmax）和 VT（HR）（152±12bpm，82.1±4.3%HRmax）。CHR 测试中 HR 与 T（lim）的关系可以用 CP 模型来描述。CHR 测试可能是一种实用的方法，无需测量呼出气体样本即可估计 RCP。此外，与 RCP 一样，CHR 测试可用于划分重强度域和严重运动强度域，预测耐力运动表现，并为竞技自行车手规定训练强度。
