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Brandon R. Macias
Researcher at University of California, San Diego
Publications - 127
Citations - 3274
Brandon R. Macias is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Spaceflight & Bed rest. The author has an hindex of 28, co-authored 113 publications receiving 2454 citations. Previous affiliations of Brandon R. Macias include Texas A&M University & University of Minnesota.
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Journal ArticleDOI
The NASA Twins Study: A multidimensional analysis of a year-long human spaceflight.
Francine E. Garrett-Bakelman,Francine E. Garrett-Bakelman,Manjula Darshi,Stefan J. Green,Ruben C. Gur,Ling Lin,Brandon R. Macias,Miles J. McKenna,Cem Meydan,Tejaswini Mishra,Jad Nasrini,Brian D. Piening,Brian D. Piening,Lindsay F. Rizzardi,Kumar Sharma,Jamila H. Siamwala,Jamila H. Siamwala,Lynn Taylor,Martha Hotz Vitaterna,Maryam Afkarian,Ebrahim Afshinnekoo,Sara Ahadi,Aditya Ambati,Maneesh Arya,Daniela Bezdan,Colin M. Callahan,Songjie Chen,Augustine M.K. Choi,George E. Chlipala,Kévin Contrepois,Marisa Covington,Brian Crucian,Immaculata De Vivo,David F. Dinges,Douglas J. Ebert,Jason I. Feinberg,Jorge Gandara,Kerry George,John Goutsias,George Grills,Alan R. Hargens,Martina Heer,Martina Heer,Ryan P. Hillary,Andrew N. Hoofnagle,Vivian Hook,Garrett Jenkinson,Garrett Jenkinson,Peng Jiang,Ali Keshavarzian,Steven S. Laurie,Brittany Lee-McMullen,Sarah B. Lumpkins,Matthew MacKay,Mark Maienschein-Cline,Ari Melnick,Tyler M. Moore,Kiichi Nakahira,Hemal H. Patel,Robert Pietrzyk,Varsha Rao,Rintaro Saito,Rintaro Saito,Denis Salins,Jan M. Schilling,Dorothy D. Sears,Caroline Sheridan,Michael B. Stenger,Rakel Tryggvadottir,Alexander E. Urban,Tomas Vaisar,Benjamin Van Espen,Jing Zhang,Michael G. Ziegler,Sara R. Zwart,John B. Charles,Craig E. Kundrot,Graham B. I. Scott,Susan M. Bailey,Mathias Basner,Andrew P. Feinberg,Stuart M. C. Lee,Christopher E. Mason,Emmanuel Mignot,Brinda K. Rana,Scott M. Smith,Michael Snyder,Fred W. Turek,Fred W. Turek +88 more
TL;DR: Given that the majority of the biological and human health variables remained stable, or returned to baseline, after a 340-day space mission, these data suggest that human health can be mostly sustained over this duration of spaceflight.
Journal ArticleDOI
Cardiac atrophy in women following bed rest
Todd Dorfman,Benjamin D. Levine,Tommy Tillery,Ronald M Peshock,Jeffrey L. Hastings,Suzanne M. Schneider,Brandon R. Macias,Gianni Biolo,Alan R. Hargens +8 more
TL;DR: Both chronic microgravity exposure and long-duration bed rest induce cardiac atrophy, which leads to reduced standing stroke volume and orthostatic intolerance, however, despite the fact that women...
Journal ArticleDOI
Assessment of Jugular Venous Blood Flow Stasis and Thrombosis During Spaceflight.
Karina Marshall-Goebel,Steven S. Laurie,I.V. Alferova,Philippe Arbeille,Serena M Auñón-Chancellor,Douglas J. Ebert,Stuart M. C. Lee,Brandon R. Macias,David Martin,James M. Pattarini,Robert Ploutz-Snyder,L. Christine Ribeiro,William J. Tarver,Scott A. Dulchavsky,Alan R. Hargens,Michael B. Stenger +15 more
TL;DR: This cohort study examines the internal jugular vein flow and morphology of crew members of the International Space Station and the use of lower body negative pressure as a countermeasure to the headward fluid shift experienced during space flight.
Journal ArticleDOI
Evaluation of treadmill exercise in a lower body negative pressure chamber as a countermeasure for weightlessness-induced bone loss: a bed rest study with identical twins.
Scott M. Smith,Janis E. Davis-Street,J. Vernell Fesperman,DS Calkins,Maneesh Bawa,Brandon R. Macias,R. Scott Meyer,Alan R. Hargens +7 more
TL;DR: Exercise within LBNP decreased the bone resorption caused by bed rest and may provide a countermeasure for spaceflight.
Journal ArticleDOI
Exercise within lower body negative pressure partially counteracts lumbar spine deconditioning associated with 28-day bed rest
Peihong Cao,Shinji Kimura,Brandon R. Macias,Toshiaki Ueno,Donald E. Watenpaugh,Alan R. Hargens +5 more
TL;DR: It is hypothesized that daily supine LBNP exercise helps counteract lumbar spine deconditioning during 28 days of microgravity simulated by bed rest, and results suggest that supineLBNP treadmill exercise partially counteracts lumbr spine lengthening and deconditionsing associated with simulated microgravity.