The online version of this article (doi:10.1186/1758-5996-6-13) contains supplementary material, which is available to authorized users.
Sílvia CG Moura-Tonello, Anielle CM Takahashi, Cristina O Francisco, Sérgio LB Lopes, Adriano M Del Vale, Audrey Borghi-Silva, Angela MO Leal, Nicola Montano, Alberto Porta and Aparecida M Catai contributed equally to this work.
The authors declare that they have no competing interests.
SCGMT: Participated in the conception and design of the study, acquisition and analysis of data, interpretation of data, performed the statistical analysis and drafted the manuscript. ACMT: Participated in the analysis and interpretation of data helped to draft the manuscript. COF: Participated in the conception and design of the study, collection, acquisition of data and helped to draft the manuscript. SLBL: Participated in cardiology exam, clinical ergometric test and acquisition of data and revising it critically for important intellectual content. AMDV: Participated in collection and acquisition of data and revising it critically of manuscript. ABS: Participated in acquisition of data and revising it critically of manuscript. AMOL: Participated in the conception and design of the study and revising it critically of manuscript. NM: Participated in the analysis and interpretation of data and revising it critically for important intellectual content. AP: Participated in the analysis and interpretation of data and revising it critically for important intellectual content. AMC: Participated in the conception, design and coordination of the study and revising it critically for important intellectual content. All authors read and approved the final manuscript.
Individuals with diabetes may develop cardiac autonomic dysfunction that may be evaluated by heart rate variability (HRV). The aim was evaluated heart rate variability (HRV) of individuals with type 2 diabetes, without cardiovascular autonomic neuropathy (CAN), in response to active postural maneuver by means of nonlinear analysis (symbolic analysis, Shannon and conditional entropy) and correlate HRV parameters between them, glycated hemoglobin and diabetes duration.
Nineteen men with type 2 diabetes without CAN (T2D) and nineteen healthy men (CG), age-range from 40 to 60 years were studied. We assessed HRV in supine and orthostatic position using symbolic analysis (0V%, 1V%, 2LV% and 2UV%), Shannon and conditional entropy (SE and NCI).
In supine position T2D presented higher sympathetic modulation (0V%) than CG. However, there was not any difference between groups for indexes of complexity (SE and NCI). Furthermore, T2D presented a preserved response of cardiac autonomic modulation after active postural maneuver.
The present study showed that individuals with type 2 diabetes without CAN presented higher cardiac sympathetic modulation. However, the complexity of HRV was not influenced by imbalance of the autonomic modulation in individuals with type 2 diabetes. In addition, the response of autonomic nervous system in the heart remains preserved after active postural maneuver in individuals with type 2 diabetes, possibly due to the lack of CAN in this group.
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- Influence of type 2 diabetes on symbolic analysis and complexity of heart rate variability in men
Sílvia CG Moura-Tonello
Anielle CM Takahashi
Cristina O Francisco
Sérgio LB Lopes
Adriano M Del Vale
Angela MO Leal
Aparecida M Catai
- BioMed Central
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