Reliability of heart rate variability analysis during submaximal exercise in subjects aged 60 years and older
Background: Assessment of heart rate variability (HRV) during the 6-min walk test (6MWT) may be useful for quantifying the effects of interventions on the cardiovascular system.Objective: To evaluate the reliability of HRV analysis during 6MWT in older adults.Methods: Thirty-eight participants aged...
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| Principais autores: | , , |
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| Formato: | Online |
| Idioma: | eng |
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UFRN
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| Endereço do item: | https://periodicos.ufrn.br/revistadefisioterapia/article/view/3597 |
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| Resumo: | Background: Assessment of heart rate variability (HRV) during the 6-min walk test (6MWT) may be useful for quantifying the effects of interventions on the cardiovascular system.Objective: To evaluate the reliability of HRV analysis during 6MWT in older adults.Methods: Thirty-eight participants aged 60 years and older (23 females) performed two 6MWTs at least 30-min apart. The RR intervals of heartbeats were quantified throughout the 6MWTs and the last 2-min were considered for analysis. The square root of the mean square successive difference of RR intervals (RMSSD) and instantaneous beat-to-beat variability (SD1) were the indices used. We compared means, applied intraclass correlations (ICC), and plotted differences in the Bland and Altman approach of these indices.Results: We found no significant differences in HRV or total distance walked between the first and second tests. The reliability of RMSSD (0.904; 0.815 – 0.950) and SD1 (0.902; 0.812 – 0.949) was excellent considering ICC values and a 95% confidence interval. The agreement of these indices was also acceptable for Bland and Altman plots using logarithms.Conclusions: The reliability of some HRV indices during the 6MWT was acceptable. This evaluation might be useful in quantifying the effects of various interventions on the autonomic modulation of the heart. |
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