The aim of this systematic review was investigate the correlation and/or agreement between the heart rate variability threshold (HRVT), identified by heart rate variability index (RMSSD and SD1), and anaerobic threshold (AT) in samples with different clinical and functional conditions. The search was performed by two authors independently using the SciELO , LILACS, and PubMed databases . The terms "anaerobic threshold", " autonomic nervous system" and "heart rate variability " were used , and when it was necessary the same words in portuguese. A total of six articles met the inclusion criteria. Correlations (r) from 0.42 to 0.99 were found between the variables investigated, depending on the sample analyzed. There were significant correlations in five of the six selected articles, in which only two were analyzed using the Bland - Altman plot showing agreement between the proposed methods. Thus, it was found that under the conditions adopted in the studies analyzed, the estimated anaerobic threshold by means of the proposed index is limited to apparently healthy adult males and type II diabetics as well as for men and women with heart failure. Moreover, it is concluded that the number of trials analyzed is not sufficiently robust to ensure the AT estimated by HRVT under the conditions studied. Finally, further research IS NEEDED on the application of this technique in different types of protocols and populations.
Anaerobic threshold; Nervous system; Heart rate
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