Key result
Five weeks of repeated head-to-seat G load improves tolerance to rapid but not gradual G elevations.
Why the study?
Does five weeks of repeated exposures to head-to-seat directed G load improve G tolerance and vascular sympathetic reflex responses?
Does five weeks of repeated exposures to head-to-seat directed G load improve G tolerance and vascular sympathetic reflex responses?
Repeated exposure to high G loads improves tolerance to rapid G elevations through increased stiffness in dependent precapillary vessels, without affecting overall vascular sympathetic responses.
Answers are grounded in this paper and cite their sources.
G training may selectively boost rapid G tolerance via vascular stiffness; leaves open translation to clinical orthostatic or cardiovascular settings.
Five weeks of repeated exposures to head-to-seat directed G load in the relaxed state increased the capacity to tolerate rapid but not gradual G elevations, suggesting unaffected overall vascular sympathetic responses to high G. The G training did not affect the responsiveness of the vascular branch of the carotid baroreflex but reduced the vestibulosympathetic reflex response. The improved tolerance to rapid G elevations is attributable to increased stiffness in dependent precapillary vessels.
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Eiken et al. (2025) studied this question. Repeated exposures to head-to-seat directed G load was evaluated on Capacity to tolerate rapid and gradual G elevations. Five weeks of repeated exposures to head-to-seat directed G load increased the capacity to tolerate rapid but not gradual G elevations.
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