Adjustments autonomic heart in individuals with diabetes undergoing to resistance exercise below and above the anaerobic threshold

Abstract

The literature showed that individuals with type 2 diabetes present alterations in the autonomic nervous system (ANS). During exercise central and peripheral mechanisms interact inducing adjustments on of heart rate (HR) responses according to the intensity, which can be changed in the presence of type 2 diabetes mellitus. Those changes may occur during the time after resistance exercise recovery. Objective: To investigate cardiac autonomic adjustments during dynamic exercise with different levels of metabolic stress, below and above the anaerobic threshold, and in the recovery period in diabetics patients. Methods: The sample will consist in 16 subjects of both sexes aged 40 to 60 years old, divided into: group 1 (individuals diagnosed with type 2 diabetes mellitus); group 2 (control, no diagnosis of type 2 diabetes). At rest HR and R-R intervals (R-Ri) will be analyzed in the time and frequency domain and the Poincaré plot. The anaerobic threshold (AT) will be determined during the performance of knee extension exercise in the Roman table and will be applied two tests: one with 10 % below and the other 10 % above the AT, during one minute, keeping spontaneous breathing and no apnea. The HR and R-Ri will be recorded continuously for 65 seconds at rest, during isotonic contraction and 5 minutes of recovery. From these data, it will be studied the adjustments of HR and its variability during exercise and recovery period. Hypothesis: The study of HRV in exercise can be used to verify the integrity of the autonomic system and determine appropriate training intensities and the effects of it.