Results 141 to 150 of about 40,337 (302)

Dynamic changes in perivascular space morphology predict signs of spaceflight-associated neuro-ocular syndrome in bed rest

npj Microgravity
During long-duration spaceflight, astronauts experience headward fluid shifts and expansion of the cerebral perivascular spaces (PVS). A major limitation to our understanding of the changes in brain structure and physiology induced by spaceflight stems ...
Sutton B. Richmond, Rachael D. Seidler, Jeffrey J. Iliff, Daniel L. Schwartz, Madison Luther, Lisa C. Silbert, Scott J. Wood, Jacob J. Bloomberg, Edwin Mulder, Jessica K. Lee, Alberto De Luca, Juan Piantino   +11 more
doaj   +1 more source

Effects of orbital spaceflight on human osteoblastic cell physiology and gene expression [PDF]

, 2000
Steven A. Harris, M. Zhang, Louis S. Kidder, Glenda L. Evans, Thomas C. Spelsberg, Russell T. Turner   +5 more
openalex   +1 more source

The Doubly Labeled Water Method for Measuring Human Energy Expenditure: Adaptations for Spaceflight [PDF]

, 1991
It is essential to determine human energy requirements in space, and the doubly labeled water method has been identified as the most appropriate means of indirect calorimetry to meet this need.
Schulz, Leslie O.
core   +1 more source

Ultrasound Biomicroscopy as a Novel, Potential Modality to Evaluate Anterior Segment Ophthalmic Structures during Spaceflight: An Analysis of Current Technology

Diagnostics
Ocular health is currently a major concern for astronauts on current and future long-duration spaceflight missions. Spaceflight-associated neuro-ocular syndrome (SANS) is a collection of ophthalmic and neurologic findings that is one potential ...
Benjamin Soares, Joshua Ong, Daniela Osteicoechea, Cihan Mehmet Kadipasaoglu, Ethan Waisberg, Prithul Sarker, Nasif Zaman, Alireza Tavakkoli, Gianmarco Vizzeri, Andrew G. Lee   +9 more
doaj   +1 more source

Cardiac atrophy after bed rest and spaceflight [PDF]

, 2001
Merja Perhonen, Fátima Franco, Lynda D. Lane, Jay C. Buckey, C. Gunnar Blomqvist, Joseph E. Zerwekh, Ronald M. Peshock, Paul T. Weatherall, Benjamin D. Levine   +8 more
openalex   +1 more source

Plasticity of the heart in response to changes in physical activity

The Journal of Physiology, EarlyView.
Abstract figure legend The heart adapts to changes in physical activity, with inactivity (e.g. bed rest or spaceflight) causing cardiac atrophy and ventricular stiffening, and endurance exercise training leading to eccentric hypertrophy and improved ventricular compliance.
Eric T. Hedge, Tiffany L. Brazile, Richard L. Hughson, Benjamin D. Levine   +3 more
wiley   +1 more source

Effect of spaceflight on cardiovascular responses to upright posture in a 77-year-old astronaut [PDF]

, 2001
Alfred C. Rossum, Michael G. Ziegler, Janice V. Meck   +2 more
openalex   +1 more source

Motor unit adaptation to disuse: crossing the threshold from firing rate suppression to neuromuscular junction transmission

The Journal of Physiology, EarlyView.
Abstract figure legend Neuromuscular disuse scenarios of limb immobilization, reduced activity and bed rest result in impairments of muscle strength that exceed losses of muscle size. Neural adaptations are an assured consequence of disuse. The available evidence garnered from human and animal models highlights suppressed motor unit firing rate (MUFR ...
Mathew Piasecki
wiley   +1 more source

Neuromuscular mechanisms for the fast decline in rate of force development with muscle disuse – a narrative review

The Journal of Physiology, EarlyView.
Abstract figure legend Muscle unloading induces declines in muscle function, particularly in maximal and explosive strength. The decline in explosive strength (quantified as rate of force development, RFD) is greater than the decline in maximal strength (quantified as maximal force, Fmax).
Luca Ruggiero, Markus Gruber
wiley   +1 more source

The scientific case for human spaceflight [PDF]

, 2001
Ian Crawford, S. K. Dunkin
openalex   +1 more source