Does ultra-short-term analysis of HRV reliably match standard 5-min analysis?
Ultra-short-term HRV analysis may serve as a reliable surrogate for standard 5-minute analysis when assessing HRV trends.
Some HRV variables calculated from R-R interval series shorter than 5 min were well matched with those calculated from the 5-min R-R interval. Thus, ultra-short-term HRV is likely to be a good surrogate method to assess trends in HRV.
Baek et al. (2015) studied this question.
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