Can Heart Rate Varibility Identify The Metabolic Thresholds?
(Abad, César Cavinato Cal)
The purpose of this study was to verify the possibility of metabolicthresholds identifications through HRV. For that, 22 male volunteers<74,5 + 7,99kg, 177,0 + 8cm, 23,86 + 1,69 (body mass index) e 9,10 %fat>, familiarized to cyclism practice, realized a cycloergometer testwith initial load of 120W and 30W increases every 3min., untilexhaustion. During all test, it was registered heart rate (HR) and itsvariability (HRV) and, at the end of each load, it was collected 25mLblood for lactate concentration analysis. It was applied a mathematicalmodel to adjust HRV curve in three straight lines and first and secondHRV thresholds were identified in intersections among the lines. Forthe identification of first and second lactate thresholds, it wasconsidered 2,0 and 3,5mM fixed concentrations, respectively. Varianceanalysis for repeated measures indicated that there were no significantdifferences between loads in which HRV and lactate thresholds werefound, showing that purposed methodology can be promissor. However, thelack of correlation between variables indicate that new studies must bemade to confirm that possibility.
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