摘要：Garcia-Tabar I, Sánchez-Medina L, Aramendi JF, Ruesta M, Ibañez J, Gorostiaga EM. Heart Rate Variability Thresholds Predict Lactate Thresholds in Professional World-Class Road Cyclists. JEPonline 2013;16(5):38-50. This study aimed to predict widely used aerobic threshold (AeT) and anaerobic lactate thresholds (AnTs) and other cycling performance variables from mathematically determined heart rate variability thresholds (HRVTs). Twelve male professional world-class road cyclists performed a continuous maximal graded cycling test. Blood lactate concentration ([La- ]), heart rate (HR), and RR intervals were monitored. Four different LTs (one AeT and three AnTs) were determined. HRVTs were determined from the standard deviation of the instantaneous beat-to-beat RR intervals (SD1). The AeT and one of the HRVT were not statistically different. Significant relationships (P<0.05) were found between the lactate thresholds and the HRVTs (r = 0.65-0.88). HRVTs strongly correlated with percentages of peak aerobic power (r = 0.94-0.97; P<0.001) and percentages of peak HR (r = 0.87-0.95; P<0.001) at which these thresholds occurred. The results indicate that lactate thresholds and percentages of peak aerobic power and peak HR at the HRVTs can be accurately predicted from SD1 values during a submaximal or maximal, non-invasive, low-cost, incremental exercise test in worldclass road cyclists. The AeT might be coincidental with the vagal withdrawal of the heart.
