Glucose threshold: concurrent validity with lactate threshold and agreement with heart rate variability threshold
DOI:
https://doi.org/10.33233/rbfex.v21i6.5409Keywords:
anaerobic threshold, exercise intensity, blood glucose, heart rateAbstract
Introduction: At lactate threshold (LT2) intensity, there is an increase in the activity of the sympathetic nervous system, an increase in plasma catecholamines, and an increase in blood glucose, which represent the glucose threshold (GT) and the heart rate variability threshold (HRVT). These thresholds may concord and allow exercise prescription through more accessible means. Aim: To analyze the concurrent validity of GT with LT2 and assess whether there is a concordance between GT and HRVT. Methods: 31 healthy and active men (22 ± 2 years) underwent two days of cardiopulmonary exercise testing (CPET). On the second day, the test aimed to identify GT, LT2, and HRVT. The intraclass correlation coefficient (ICC), typical error (TE), coefficient of variation (CV), and Bland-Altman tested their reliability and concordance. Results: The HR showed good reliability (ICC = 0.80) and good precision (TE = 4.7% and CV = 6.6%) for GT with LT2. For GT and HRVT, the HR showed moderate reliability (ICC = 0.60) and good precision (TE = 5.9% and CV = 8.4%). Conclusion: GT and LT2 presented concurrent validity for identifying the second anaerobic threshold. GT concordance with LT2 is reinforced by the mechanisms that link them.
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