Determination of Individual Glucose Threshold Using Pharmacy Portable Blood Glucose Meter

Abstract

Introduction The individual glucose threshold (IGT) has been used to estimate the anaerobic threshold with low-cost analyses and shorter times. However, the reliability of the glycemic analysis using a portable pharmacy glucose meter has received little attention. Objective To identify the IGT using a portable glucose meter and to compare it with the ventilatory threshold (VT). Methods Fourteen active, healthy men (25.9 ± 3.2 years; %BF = 17.9 ± 3.7%) performed an incremental treadmill test. The anaerobic threshold was identified by two different methods: (1) IGT, corresponding to the intensity of the lowest glucose value during the test; and (2) VT, corresponding to the break in linearity of the ventilation curve and an increase in the respiratory oxygen equivalent, without an equivalent increase in carbon dioxide. Results There were significant differences between VT (9.9 ± 1.2 km/h) and IGT (9.5 ± 1/1 km/h), corresponding to 75.4 ± 9.2 and 72.5 ± 10.4 %VO2max, respectively. The methods presented high correlation (r = 0.82, p = 0.002) and the Bland-Altman technique showed agreement between IGT and VT, with a mean difference of 0.5 km/h. Conclusion It was possible to determine the intensity of IGT by the glycemic response in the incremental test using a portable glucose meter. The IGT underestimated the intensity of VT by approximately 0.5 km/h, but with a high correlation and agreement between them. Level of evidence III, Case-Controle Study.

Biological Responses to Short-Term Maximal Exercise in Male Police Officers

“…Regarding glucose, no statistical significant change in this biomarker has been reported after RAST ( Table 2 ). This result is opposite to the study of Sousa et al (2019) . The most likely cause of this stable after-exercise glucose is the increase in hepatic glycogen catabolism mediated by the effect of higher cortisol during the exercise.…”

“…Similarly, previous studies revealed that lactate increased to values of 10–12 mmol/l at the end of a brief and intense exercise stint ( Yalcin et al, 2003 ; Zagatto et al, 2009 ). From this intensity, the plasma concentration of lactate increases exponentially during an exercise with increasing load, to reach concentrations of 10 to 14 mmol/l, at maximum and supra-maximum intensities ( Sousa et al, 2019 ). During exercise, muscle cells are responsible for increasing the plasma concentration of lactate.…”

“…Testosterone and cortisol concentrations were significantly increased in high school students after a session of high-intensity exercise (70–85% of maximal heart rate) ( Budde et al, 2015 ; Budde et al, 2010 ). Following high-intensity maximal tasks, many biochemical data increased, including creatine phosphokinase (CPK), blood lactate and glucose, and uric-acid ( Ammar, Chtourou, Hammouda, et al, 2015 ; Ammar, Chtourou, Trabelsi, et al, 2015 ; Ammar et al, 2018 ; Sousa et al., 2019 ; Yalcin et al, 2003 ). CPK is a well-known biomarker of muscle damage and may contribute to the fatigue process by increasing the myoplasmic concentration of inorganic phosphate ( Khaitin et al, 2021 ).…”

“…Previous studies have mainly focused on how the time of day affects short-term maximal performance in highly trained athletes, students or sedentary participants ( Belviranli et al, 2017 ; Benloucif et al, 2008 ; Chtourou et al, 2015 ; Gabriel et al, 1992 ; Kindermann et al, 1982 ; Mastaloudis et al, 2001 ; Miyazaki et al, 2001 ; Monteleone et al, 1992 ; Smith et al., 2013 ; Sousa et al, 2019 ; Theron et al, 1984 ; Wayner et al, 1987 ; Yalcin et al, 2003 ). To the best of the authors’ knowledge, no previous study had focused on the diurnal variation of short-term maximal performance or the biological data of police officers.…”