Exercise effects on bed rest-induced brain changes.
<h4>Purpose</h4>Spaceflight negatively affects sensorimotor behavior; exercise mitigates some of these effects. Head down tilt bed rest (HDBR) induces body unloading and fluid shifts, and is often used to investigate spaceflight effects. Here, we examined whether exercise mitigates effec...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2018-01-01
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| Series: | PLoS ONE |
| Online Access: | https://doi.org/10.1371/journal.pone.0205515 |
| _version_ | 1818401500881223680 |
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| author | Vincent Koppelmans Jessica M Scott Meghan E Downs Kaitlin E Cassady Peng Yuan Ofer Pasternak Scott J Wood Yiri E De Dios Nichole E Gadd Igor Kofman Roy Riascos Patricia A Reuter-Lorenz Jacob J Bloomberg Ajitkumar P Mulavara Lori L Ploutz-Snyder Rachael D Seidler |
| author_facet | Vincent Koppelmans Jessica M Scott Meghan E Downs Kaitlin E Cassady Peng Yuan Ofer Pasternak Scott J Wood Yiri E De Dios Nichole E Gadd Igor Kofman Roy Riascos Patricia A Reuter-Lorenz Jacob J Bloomberg Ajitkumar P Mulavara Lori L Ploutz-Snyder Rachael D Seidler |
| author_sort | Vincent Koppelmans |
| collection | DOAJ |
| description | <h4>Purpose</h4>Spaceflight negatively affects sensorimotor behavior; exercise mitigates some of these effects. Head down tilt bed rest (HDBR) induces body unloading and fluid shifts, and is often used to investigate spaceflight effects. Here, we examined whether exercise mitigates effects of 70 days HDBR on the brain and if fitness and brain changes with HDBR are related.<h4>Methods</h4>HDBR subjects were randomized to no-exercise (n = 5) or traditional aerobic and resistance exercise (n = 5). Additionally, a flywheel exercise group was included (n = 8). Exercise protocols for exercise groups were similar in intensity, therefore these groups were pooled in statistical analyses. Pre and post-HDBR MRI (structure and structural/functional connectivity) and physical fitness measures (lower body strength, muscle cross sectional area, VO2 max, body composition) were collected. Voxel-wise permutation analyses were used to test group differences in brain changes, and their associations with fitness changes.<h4>Results</h4>Comparisons of exercisers to controls revealed that exercise led to smaller fitness deterioration with HDBR but did not affect brain volume or connectivity. Group comparisons showed that exercise modulated post-HDBR recovery of brain connectivity in somatosensory regions. Posthoc analysis showed that this was related to functional connectivity decrease with HDBR in non-exercisers but not in exercisers. Correlational analyses between fitness and brain changes showed that fitness decreases were associated with functional connectivity and volumetric increases (all r >.74), potentially reflecting compensation. Modest brain changes or even decreases in connectivity and volume were observed in subjects who maintained or showed small fitness gains. These results did not survive Bonferroni correction, but can be considered meaningful because of the large effect sizes.<h4>Conclusion</h4>Exercise performed during HDBR mitigates declines in fitness and strength. Associations between fitness and brain connectivity and volume changes, although unadjusted for multiple comparisons in this small sample, suggest that supine exercise reduces compensatory HDBR-induced brain changes. |
| first_indexed | 2024-12-14T07:53:28Z |
| format | Article |
| id | doaj.art-0696e4035dcf4997ad84faba6f55723f |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-14T07:53:28Z |
| publishDate | 2018-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-0696e4035dcf4997ad84faba6f55723f2022-12-21T23:10:38ZengPublic Library of Science (PLoS)PLoS ONE1932-62032018-01-011310e020551510.1371/journal.pone.0205515Exercise effects on bed rest-induced brain changes.Vincent KoppelmansJessica M ScottMeghan E DownsKaitlin E CassadyPeng YuanOfer PasternakScott J WoodYiri E De DiosNichole E GaddIgor KofmanRoy RiascosPatricia A Reuter-LorenzJacob J BloombergAjitkumar P MulavaraLori L Ploutz-SnyderRachael D Seidler<h4>Purpose</h4>Spaceflight negatively affects sensorimotor behavior; exercise mitigates some of these effects. Head down tilt bed rest (HDBR) induces body unloading and fluid shifts, and is often used to investigate spaceflight effects. Here, we examined whether exercise mitigates effects of 70 days HDBR on the brain and if fitness and brain changes with HDBR are related.<h4>Methods</h4>HDBR subjects were randomized to no-exercise (n = 5) or traditional aerobic and resistance exercise (n = 5). Additionally, a flywheel exercise group was included (n = 8). Exercise protocols for exercise groups were similar in intensity, therefore these groups were pooled in statistical analyses. Pre and post-HDBR MRI (structure and structural/functional connectivity) and physical fitness measures (lower body strength, muscle cross sectional area, VO2 max, body composition) were collected. Voxel-wise permutation analyses were used to test group differences in brain changes, and their associations with fitness changes.<h4>Results</h4>Comparisons of exercisers to controls revealed that exercise led to smaller fitness deterioration with HDBR but did not affect brain volume or connectivity. Group comparisons showed that exercise modulated post-HDBR recovery of brain connectivity in somatosensory regions. Posthoc analysis showed that this was related to functional connectivity decrease with HDBR in non-exercisers but not in exercisers. Correlational analyses between fitness and brain changes showed that fitness decreases were associated with functional connectivity and volumetric increases (all r >.74), potentially reflecting compensation. Modest brain changes or even decreases in connectivity and volume were observed in subjects who maintained or showed small fitness gains. These results did not survive Bonferroni correction, but can be considered meaningful because of the large effect sizes.<h4>Conclusion</h4>Exercise performed during HDBR mitigates declines in fitness and strength. Associations between fitness and brain connectivity and volume changes, although unadjusted for multiple comparisons in this small sample, suggest that supine exercise reduces compensatory HDBR-induced brain changes.https://doi.org/10.1371/journal.pone.0205515 |
| spellingShingle | Vincent Koppelmans Jessica M Scott Meghan E Downs Kaitlin E Cassady Peng Yuan Ofer Pasternak Scott J Wood Yiri E De Dios Nichole E Gadd Igor Kofman Roy Riascos Patricia A Reuter-Lorenz Jacob J Bloomberg Ajitkumar P Mulavara Lori L Ploutz-Snyder Rachael D Seidler Exercise effects on bed rest-induced brain changes. PLoS ONE |
| title | Exercise effects on bed rest-induced brain changes. |
| title_full | Exercise effects on bed rest-induced brain changes. |
| title_fullStr | Exercise effects on bed rest-induced brain changes. |
| title_full_unstemmed | Exercise effects on bed rest-induced brain changes. |
| title_short | Exercise effects on bed rest-induced brain changes. |
| title_sort | exercise effects on bed rest induced brain changes |
| url | https://doi.org/10.1371/journal.pone.0205515 |
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