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.
Highlights
Endurance training, generally called aerobic training in the clinical context, is strongly recommended for type 2 diabetes management (Canadian Diabetes Association Clinical Practice Guidelines Expert Committee and Cheng, 2013; Colberg et al, 2016; American Diabetes Association [ADA], 2018), as it provides both short- and long-term benefits, including improvedGlycemic Threshold and Type 2 Diabetes blood pressure, lipid profile, and blood glucose, among others (Yang et al, 2014; Colberg et al, 2016; Delevatti et al, 2016a; Liubaoerjijin et al, 2016)
In interval training models, such as high intensity interval training (HIIT) or sprint interval training (SIT), which have great anaerobic contribution, intensity is the main component of the exercise dosage, with generally a short duration
According to the paired t-test, there were no significant differences between the glycemic threshold (GT) and VT2 methods (Mean velocity, p = 0.25; heart rate (HR), p = 0.97; VO2, p = 0.71)
Summary
Generally called aerobic training in the clinical context, is strongly recommended for type 2 diabetes management (Canadian Diabetes Association Clinical Practice Guidelines Expert Committee and Cheng, 2013; Colberg et al, 2016; American Diabetes Association [ADA], 2018), as it provides both short- and long-term benefits, including improvedGlycemic Threshold and Type 2 Diabetes blood pressure, lipid profile, and blood glucose, among others (Yang et al, 2014; Colberg et al, 2016; Delevatti et al, 2016a; Liubaoerjijin et al, 2016). These studies have been evaluating acute (Terada et al, 2013; Delevatti et al, 2016b; Asano et al, 2017; Santiago et al, 2018) and chronic (Li et al, 2012; Ruffino et al, 2017; Pandey et al, 2017) effects in varying outcomes, including blood glucose, blood pressure, insulin, bradykinin, HbA1c, insulin resistance, and lipid profile In this context, interventions have contributed to a better understanding about the role of the aerobic training variables (i.e., intensity, duration) on type 2 diabetes control. A good example is shown in the guidelines for exercise and type 2 diabetes (Colberg et al, 2010, 2016; American Diabetes Association [ADA], 2018), that define the duration (150 min, 75 min, or a combination of these) of aerobic training regarding its intensity (moderate, vigorous, or a combination of these, respectively)
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