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   <subfield code="a">Cardiac autonomic dysfunction in rats chronically treated with anabolic steroid</subfield>
   <subfield code="h">[Elektronische Daten]</subfield>
   <subfield code="c">[Pedro Pereira-Junior, Elen Chaves, Ricardo Costa-e-Sousa, Masako Masuda, Antonio de Carvalho, José Nascimento]</subfield>
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   <subfield code="a">To date no published data exist regarding the effects of chronic high-dose anabolic-androgenic steroid administration on tonic cardiac autonomic control. The aim of this study was to evaluate, by power spectral analysis of heart rate variability (HRV), the effects of chronic treatment with supraphysiological doses of nandrolone decanoate (DECA) on tonic cardiac autonomic regulation in sedentary rats. Male Wistar rats were treated weekly with 10mgkg−1 of DECA (n=7) or vehicle (CONTROL, n=7) for 10weeks. At the 8th week of treatment, electrocardiogram was recorded in the conscious state, for time- and frequency-domain HRV analysis. Parasympathetic indexes were reduced in DECA group: high-frequency power (CONTROL=11.1±3.0ms² vs. DECA=3.8±0.6ms², P&lt;0.05), RMSSD (CONTROL=5.9±0.9ms vs. DECA 3.5±0.3ms; P&lt;0.05) and pNN5 (CONTROL=31.5±7.5ms vs. DECA=13.2±2.6ms; P&lt;0.05). The sympathetic index LF/HF tended to be higher in DECA group (CONTROL=0.65±0.15 vs. DECA=1.17±0.26, P=0.0546). In conclusion, chronic treatment with DECA, in rats, impairs tonic cardiac autonomic regulation, which may provide a key mechanism for anabolic steroid-induced arrhythmia and sudden cardiac death.</subfield>
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