Intermittent short-arm centrifugation is a partially effective countermeasure against upright balance deterioration following 60-day head-down tilt bed rest

De Martino, Enrico, Salomoni, Sauro Emerick, Hodges, Paul W., Hides, Julie, Lindsay, Kirsty, Debuse, Dorothee, Winnard, Andrew, Elliott, James M., Hoggarth, Mark, Beard, David, Cook, Jonathan A., Ekman, Robert, Hinterwaldner, Luis, Scott, Jonathan, Weber, Tobias and Caplan, Nick (2021) Intermittent short-arm centrifugation is a partially effective countermeasure against upright balance deterioration following 60-day head-down tilt bed rest. Journal of Applied Physiology. ISSN 8750-7587 (In Press)

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This study investigated whether artificial gravity (AG), induced by short-radius centrifugation, mitigated deterioration in standing balance and anticipatory postural adjustments (APAs) of trunk muscles following 60-day head-down tilt bed rest. Twenty-four participants were allocated to one of three groups: control group (N=8); 30 minutes continuous AG daily (N=8); intermittent 6x5 minutes AG daily (N=8). Before and immediately after bed rest, standing balance was assessed in four conditions: eyes open and closed on both stable and foam surfaces. Measures including sway path, root-mean-square, and peak sway velocity, sway area, sway frequency power, and sway density curve were extracted from the centre of pressure displacement. APAs were assessed during rapid arm movements using intramuscular or surface electromyography electrodes of the rectus abdominis, obliquus externus and internus abdominis, transversus abdominis, erector spinae at L1, L2, L3, and L4 vertebral levels, and deep lumbar multifidus muscles. The relative latency between the EMG onset of the deltoid and each of the trunk muscles was calculated. All three groups had poorer balance performance in most of the parameters (all P<0.05) and delayed APAs of the trunk muscles following bed rest (all P<0.05). Sway path and sway velocity were deteriorated, and sway frequency power was less in those who received intermittent AG than in the control group (all P<0.05), particularly in conditions with reduced proprioceptive feedback. These data highlight the potential of intermittent AG to mitigate deterioration of some aspects of postural control induced by gravitational unloading, but no protective effects on trunk muscle responses were observed.

Item Type: Article
Additional Information: Funding information: The AGBRESA study was funded by the German Aerospace Center, the European Space Agency (contract number: 4000113871/15/NL/PG), and the National Aeronautics and Space Administration (contract number: 80JSC018P0078) and performed at the :envihab research facility of the DLR Institute of Aerospace Medicine. Funding for this selected project (ESA-HSO-U-LE-0629) was received from the STFC/UK Space Agency. PH is funded by a Fellowship from the National Health and Medical Research Council of Australia (APP1102905). SS is supported by a Program grant from the NHMRC awarded to PH (APP1091302). The study was also supported by the Space Medicine team of the European Space Agency (ESA HRE-OM).
Uncontrolled Keywords: intra-muscular EMG, postural control, anticipatory postural adjustments, sway, artificial gravity
Subjects: C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Elena Carlaw
Date Deposited: 02 Jul 2021 16:52
Last Modified: 03 Jul 2021 09:48

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