Author

Benjamin D. Levine

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Sep 2026

Impact of Prolonged Spaceflight on Cardiac Structure and Function: An Exploratory Longitudinal Observational Study.

BACKGROUND Gravitational gradients, ranging from the surface of the Earth (1 G) to the microgravity of spaceflight (0 G), including intermediate gravitational fields such as those on Mars (⅜ G), directly affect cardiovascular hemodynamics. We sought to track changes in cardiac structure and function over the course of...

V. Appadurai, Kazuaki Negishi, Allen G. Borowski et al. · Circulation · 0 citations

Review Open access Jul 2026

Guidelines for Rigor and Reproducibility of Heart Rate Variability within Human Cardiovascular Research

Heart rate variability has some utility as a cardiovascular risk stratification tool, but is not appropriate to employ as a specific marker of cardiac sympathetic outflow or sympathovagal balance, and investigators should interpret and contextualize findings within the limitations outlined in this guideline review.

Jason R. Carter, Nathaniel D. M. Jenkins, J. Bigalke et al. · American Journal of Physiolo... · 3 citations