Gravity, microgravity, and artificial gravity: physiological effects, implementation, and applications.
Level 5 - mechanism / opinion, no new human data
Narrative review synthesizing physiological mechanisms, spaceflight effects, and terrestrial analogs without primary experimental data or systematic search methodology.
PubMed 41021767 · doi:10.1152/physrev.00055.2024
What was done
This narrative review synthesizes literature examining the physiological impacts of gravity, microgravity, and artificial gravity across human organ systems. It describes graviception through distributed vestibular networks, headward fluid shifts, cardiovascular deconditioning, musculoskeletal decline during spaceflight, and Earth-based analogs such as head-down bed rest, dry immersion, and parabolic flight.
What was found
The abstract reports no quantitative data or specific numerical effect sizes. It qualitatively describes how gravitational unloading leads to headward fluid distribution, visual impairment, heightened thrombosis risk, muscle atrophy, bone demineralization, and post-flight orthostatic intolerance. It also highlights parallels between microgravity-induced deconditioning and terrestrial frailty or aging, discussing potential countermeasures including targeted exercise, fluid management, and hypergravity.
Why it matters
Framing microgravity deconditioning as a physiological model of accelerated aging helps bridge space medicine and geriatric care, offering shared mechanistic pathways to develop interventions for frailty, immobility, and fall risk in older adults.
Limits
The abstract provides no sample size, search strategy, or systematic evaluation criteria. As a narrative review, it reflects broad mechanistic concepts rather than controlled empirical trials, and it does not report quantitative outcomes or effect estimates.
Cited by
- supports Exposure to microgravity in spaceflight leads to bone demineralization, muscle atrophy, and cardiovascular deconditioning.