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. 2018 Nov 27;9:1680. doi: 10.3389/fphys.2018.01680

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Copyright © 2018 Ozdemir, Goel, Reschke, Wood and Paloski.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Representative time to boundary (TTB) time series for an astronaut and an elderly subject. Effects of spaceflight on postural control performance can be observed from head erect (HE) trials obtained from a representative astronaut subject before spaceflight (L-10) and immediately after landing (R+0) for both SOT-2 (A) and SOT-5 (B) conditions. Similarities in postural control performance between spaceflight and aging can be observed from head dynamic (HD) trials obtained on return day (R+0) in a representative astronaut subject and head erect (HE) trials obtained in a representative elderly subject for both SOT-2 (C) and SOT-5 (D) conditions. Black lines with shaded regions depict the TTB trace in anterior-posterior direction over each trial truncated at 10 s. Shaded areas indicate the iTTB (absolute) for each trial. The iTTB (%) is computed by dividing the iTTB (absolute) by the total area shown in the plot. The shaded region in (D) for an astronaut subject also show the time instance when TTB value hit zero, indicating a fall.