Glycemic Threshold as an Alternative Method to Identify the Anaerobic Threshold in Patients With Type 2 Diabetes

Abstract

Purpose: To analyze the agreement between the velocity, heart rate, and oxygen uptake values corresponding to second ventilatory threshold and glycemic threshold in patients with type 2 diabetes.Methods: Twenty-four untrained patients (55.1 ± 8.9 years) were evaluated. Three different parameters of training intensity corresponding to anaerobic threshold, one mechanical (velocity) and two physiological (heart rate and oxygen uptake) parameters, were identified by a classical method (second ventilatory threshold) and by an alternative method (glycemic threshold). To determine the threshold values, patients performed an incremental treadmill test, with an initial velocity of 3 km.h-1 for 3 min, that was then increased by 1 km.h-1 every 2 min. Comparisons between mean values and the degree of agreement between second ventilatory threshold and glycemic threshold were analyzed using the paired t-test and Bland-Altman test, respectively.Results: All patients performed the tests appropriately, and no adverse effects were recorded. Patients demonstrated similar mean velocity (p = 0.25), heart rate (p = 0.97) and oxygen uptake (p = 0.71) between the ventilatory threshold (6.4 ± 0.6 km.h-1, 130.1 ± 18.7 bpm, 15.2 ± 3.5 ml.kg.min-1) and the glycemic threshold (6.2 ± 0.9 km.h-1, 130.2 ± 12.8 bpm, 15.0 ± 3.8 ml.kg.min-1).Conclusion: The present study indicates an agreement between the glycemic and second ventilatory methods in determination of the anaerobic threshold of patients with type 2 diabetes; and thus, either method may be used for these patients.

Limiar glicêmico: validade com limiar de lactato e concordância com a variabilidade da frequência cardíaca

“…Therefore, the present study presents the finding that the phenomenon is also observable during a CPET, which consists of a stress assessment, is more applied in clinical settings, and can be used in populations with comorbid conditions [11]. In this sense, these findings make the GT method more accessible.…”

“…However, in this present study, the blood glucose analysis was carried out using expensive equipment. Despite this, other investigations employed measures with portable equipment showing reliable [27,11].…”

“…The plasma catecholamine increase promotes the bioavailability of blood glucose through glycogenolysis and gluconeogenesis stimulation [10]. The scientific literature indicates a concordance between the glycemic and second ventilatory methods for anaerobic threshold determination in patients with type 2 diabetes [11].…”