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|Type:||Artigo de periódico|
|Title:||Evaluation Of Autonomic Heart Rate Modulation Among Sedentary Young Men, In Sitting And Supine Postures|
da Silva E.
|Abstract:||Objective: To evaluate and compare the autonomic heart rate (HR) modulation, under resting conditions in relation to body posture, in sedentary young adults. Methods: Twenty young healthy and sedentary men aged 22.6 ± 2.5 years participated in the study. The HR and R-R intervals (in ms) of the electrocardiogram (EKG) were obtained in real time using the modified DII derivation, with the volunteers at rest in the supine and sitting positions, for 15 minutes. The R-R data were analyzed in the time domain, by means of the RMSSID, RMSM and pNN50 (%) indices; and in the frequency domain, by means of spectral analysis and fast Fourier transforms (FFT), using low frequency (LF) and high frequency (HF) bands expressed as normalized units and as the LF/HF ratio. The statistical analysis consisted of the Spearman test for correlation analyses and the Wilcoxon test for paired samples, with significance of α= 5%. Results: In the time domain, the RMSSD and pNN50 indices demonstrated statistically significant differences between the supine and sitting positions (p< 0.05). the RMSM index did not showed any statistically significant difference between the positions (p>0.05). In the frequency domain, the LF and HF bands and the LF/HF ratio demonstrated statistically significant differences between the supine and sitting positions (p<0.05). Conclusions: The results demonstrated that by changing the posture, autonomic adjustments were produced to the parasympathetic and sympathetic nervous systems with regard to HR control. This can be attributed to the integrity of the neurocardiac system.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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