Key result
Down syndrome HRV studies uniformly fail to meet methodological standards and guidelines.
Why the study?
Individuals with Down syndrome show altered heart rate variability responses indicating reduced vagal regulation, but compliance with standard methodological guidelines across studies needed evaluation.
Systematic Review (n=477)
Current research on heart rate variability in individuals with Down syndrome lacks adherence to established methodological standards, making cross-study comparisons difficult and highlighting the need for more robust study designs.
HRV data in Down syndrome warrant cautious clinical interpretation; challenges all prior studies and leaves open need for guideline-compliant research.
Individuals with Down syndrome (DS) present similar heart rate variability (HRV) parameters at rest but different responses to selected movement maneuvers in comparison to individuals without DS, which indicates reduced vagal regulation. The present study undertakes a scoping review of research on HRV in individuals with DS, with special attention paid to the compliance of the studies with standards and methodological paper guidelines for HRV assessment and interpretation. A review was performed using PubMed, Web of Science and CINAHL databases to search for English language publications from 1996 to 2020 with the MESH terms "heart rate variability" and "down syndrome", with the additional inclusion criteria of including only human participants and empirical investigations. From 74 studies, 15 were included in the review. None of the reviewed studies met the recommendations laid out by the standards and guidelines for providing the acquisition of RR intervals and necessary details on HRV analysis. Since authors publishing papers on this research topic do not adhere to the prescribed standards and guidelines when constructing the methodology, results of the research papers on the topic are not directly comparable. Authors need to design the study methodology more robustly by following the aforementioned standards, guidelines and recommendations.
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Gąsior et al. (2023) conducted a systematic review in Down syndrome (n=477). Heart rate variability assessment vs. Standards and guidelines was evaluated on Compliance with standards and guidelines for HRV assessment. None of the 15 reviewed studies on heart rate variability in individuals with Down syndrome met the recommended standards and guidelines for RR interval acquisition and HRV analysis.
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