Maximal Constant Heart Rate - A Heart Rate Based Method to Estimate Maximal Lactate Steady State in Running

Abstract

The aim of the present study was to investigate the accuracy of the maximal constant heart rate method for predicting anaerobic threshold (AnT) in running. This method only requires a common heart rate (HR) monitor and is based on the identification of the maximal constant HR maintainable for 30 min (HRMC). HRMC, 4-mmol threshold, and maximal lactate steady state (MLSS) were determined in 31 probands. 17 probands underwent an additional MLSS retest within 2 weeks. The correlation between HR at MLSS and at MLSS retest was very close (r = 0.807; SEE = 5.25 beats x min(-1); p < 0.001). So were the correlations between HR at 4-mmol threshold and MLSS (r = 0.844; SEE = 6.43 beats x min(-1); p < 0.001) and between HRMC and HR at MLSS (r = 0.820; SEE = 6.73 beats x min(-1); p < 0.001). Mean velocities at maximum constant HR trials and MLSS (r = 0.895; SEE = 0.185 m x s(-1); p < 0.001) as well as 4-mmol threshold and MLSS (r = 0.899; SEE = 0.186 m x s(-1); p < 0.001) were highly correlated. In conclusion, data presented in this study confirm that the determination of HRMC is a manageable method giving a highly accurate estimation of both HR and velocity at MLSS in running.

Correlation of heart rate at lactate minimum and maximal lactate steady state in wheelchair-racing athletes

“…These findings support the role of HR as one of the main predictors of training intensity, especially during exercise in the field. 20,21 This is of practical importance, as transferring laboratory-based absolute data such as speed or workload often is difficult, 22 even more in wheelchair racing. Further, the application of HR as a feasible tool for guidance of endurance training was also confirmed by results of a recently published study 22 showing a high and reproducible correlation between maximal constant HR and MLSS.…”

“…20,21 This is of practical importance, as transferring laboratory-based absolute data such as speed or workload often is difficult, 22 even more in wheelchair racing. Further, the application of HR as a feasible tool for guidance of endurance training was also confirmed by results of a recently published study 22 showing a high and reproducible correlation between maximal constant HR and MLSS. This result is in line with observations of sports practice, where athletes perform at a constant HR during competitions (for example, cycling time trial performance) 23,24 rather than at constant blood lactate concentrations or .…”

Heart rate-based protocols for exercise challenge testing do not ensure sufficient exercise intensity for inducing exercise-induced bronchial obstruction

“…The reference lactate-based method in determining the transition from mainly aerobic to anaerobic metabolism is the maximum lactate steady state, defined as the highest work rate that can be maintained over time without continual blood lactate accumulation 21. According to the literature,20 21 22 23 this transition in running occurs at a mean lactate concentration of 4–5 (SD 0.5–1) mmol/l. An energetic load of >6 mmol/l, therefore, can be assumed to be predominantly anaerobic.…”

“…According to the literature, there is a high individual variation not only in HR max 14 but also the heart rate at the transition from mainly aerobic to mainly anaerobic metabolism 16 17 18 19 20. The formula-based determination of the target HR, therefore, induced different relative workloads for our subjects.…”

Limiar De Variabilidade Da Freqüência Cardíaca E Resposta Do Lactato Sanguíneo Em Exercícios De Carga Constante

“…Vobejda et al (2006) analisaram a máxima FC constante (FCmc) obtida em protocolos de esforço prolongando em esteira e observaram uma correlação significante (p<0,01) entre as velocidades na FCmc e a máxima fase estável de lactato. Além disso, a FCmc (178 ± 9 bpm) apresentou valores próximos da FC no limiar anaeróbio determinado pelo ponto fixo de 4 mmol.l -1 (177 ± 11 bpm).…”