期刊名称：Journal of Respiratory and CardioVascular Physical Therapy
印刷版ISSN：2238-4677
出版年度：2012
卷号：1
期号：2
页码：37-43
语种：English
出版社：Journal of Respiratory and CardioVascular Physical Therapy
摘要：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.
关键词：Walking; Heart rate variability; Exercise; Six-minute walk test; Reliability
