Another factor that has been proposed to contribute to SANS is exercise. Although moderate and high intensity aerobic or resistance exercise have clearly identified benefits for cardiac, muscle, and bone health, it is unknown whether such exercise contributes to the development of SANS. The objective of this study was to characterize the impact of three exercise modalities used by astronauts on cerebral blood flow (CBF), ICP, and IOP.
Twenty men participated in the study. Compared with supine IOP, and estimated TLPG, -15° HDT was associated with increased IOP and internal jugular venous pressure (IJVP) and with decreased translaminar pressure gradient (TLPG). Exercise, regardless of modality, at -15° HDT was associated with decreased IOP and TLPG compared with rest. Both IOP and TLPG were higher in participants who wore swimming goggles compared with those not wearing goggles.
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