F
Fred Shaffer
Researcher at Truman State University
Publications - 30
Citations - 4970
Fred Shaffer is an academic researcher from Truman State University. The author has contributed to research in topics: Certification & Heart rate variability. The author has an hindex of 8, co-authored 26 publications receiving 2812 citations.
Papers
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Journal ArticleDOI
An Overview of Heart Rate Variability Metrics and Norms.
Fred Shaffer,Jay P. Ginsberg +1 more
TL;DR: Current perspectives on the mechanisms that generate 24 h, short-term (<5 min), and ultra-short-term HRV are reviewed, and the importance of HRV, and its implications for health and performance are reviewed.
Journal ArticleDOI
A healthy heart is not a metronome: an integrative review of the heart's anatomy and heart rate variability.
TL;DR: The authors conclude that a coherent heart is not a metronome because its rhythms are characterized by both complexity and stability over longer time scales.
Journal ArticleDOI
Heart Rate Variability: New Perspectives on Physiological Mechanisms, Assessment of Self-regulatory Capacity, and Health risk.
Rollin McCraty,Fred Shaffer +1 more
TL;DR: It is concluded that the heart's rhythms are characterized by both complexity and stability over longer time scales that reflect both physiological and psychological functional status of these internal self-regulatory systems.
Journal ArticleDOI
A Critical Review of Ultra-Short-Term Heart Rate Variability Norms Research.
TL;DR: Investigating the criterion validity of ultra-short-term (UST) HRV measurements of less than 5-min duration compared with short-term recordings found that UST measurements are proxies of proxies and seek to replace short- term values which, in turn, attempt to estimate long-term metrics.
Journal ArticleDOI
Heart Rate Variability Anatomy and Physiology
Fred Shaffer,John Venner +1 more
TL;DR: The regulation of the heart, the meaning of HRV, Thayer and Lane's neurovisceral integration model, the sources ofHRV, HRV frequency and time domain measurements, Porges's polyvagal theory, and resonance frequency breathing are examined.