A Test for Determining Critical Heart Rate Using the Critical Power Model

• Autores: Michelle Mielke, Terry J. Housh, C. Russell Hendrix, Jorge M. Zuniga, Clayton L. Camic, Richard J. Schmidt, Glen O. Johnson
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 25, Nº. 2, 2011, págs. 504-510
• Idioma: inglés
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• Resumen

  • 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 (CPHR), ventilatory threshold (VTHR), and respiratory compensation point (RCPHR). Fifteen women (mean age ± SD = 21.7 ± 2.1 years) performed an incremental test to exhaustion to determine [latin capital V with dot above]o2peak, VTHR, and RCPHR. 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 (HBlim) was calculated as the product of the average 5-second HR (bpm) and total time to exhaustion (Tlim in minutes). The HBlim and total work (Wlim in kilograms-meters) were plotted as a function of the Tlim at each power output, and the slope coefficients of the regression lines between HBlim or Wlim and Tlim 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 RCPHR (172 ± 9 bpm, 92.9 ± 2.2%HRmax) but was higher (p < 0.05) than CPHR (154 ± 10 bpm, 83.2 ± 4.0%HRmax) and VTHR (152 ± 12 bpm, 82.1 ± 4.3%HRmax). The relationship between HR and Tlim 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.