Heart Rate Variability Thresholds as A Means of Non-Invasive Exercise Physiological Threshold Recognition:A Literature Review
Heart rate variability thresholds(HRVTs)are physiological inflection points that oc-cur as heart rate variability(HRV)changes with increasing exercise intensity in incremental ex-ercise.It is a non-invasive and convenient threshold determination method.This study reviewed relevant researches at home and abroad,focusing on the physiological mechanisms of HRVTs,its consistency with traditional thresholds,and identification methods.Research indicates that HRVTs has two physiological inflection points,HRVT1 and HRVT2,just like traditional exercise physiological thresholds.The determination methods based on HRV parameters can be divided into three kinds:time domain,frequency domain,and non-linear analysis.With appropriate anal-ysis methods,HRVTs and traditional thresholds are consistent,which means they are replace-able:time domain analysis parameters may be more suitable for determining HRVT1;frequency domain analysis parameters require appropriate processing before they can be applied to HRVTs determination.The detrended fluctuation analysis method in non-linear analysis is a newly method that shows potential for determining both HRVTs physiological thresholds.Research suggests that it may have higher accuracy for determining HRVT2,while its precision for HRVT1 still needs improvement.Given the heterogeneity in current HRVTs researches,cHRV parameters and the differences in population studies,it is recommended that future studies con-duct standardized classification research on HRV parameters.
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