Show simple item record

dc.contributor.author
Alessandro, Cristiano
dc.contributor.author
Tafreshi, Amirehsan Sarabadani
dc.contributor.author
Riener, Robert
dc.date.accessioned
2024-09-23T11:39:09Z
dc.date.available
2024-09-23T06:08:13Z
dc.date.available
2024-09-23T11:37:57Z
dc.date.available
2024-09-23T11:38:39Z
dc.date.available
2024-09-23T11:39:09Z
dc.date.issued
2024-08-27
dc.identifier.issn
2624-9367
dc.identifier.other
10.3389/fspor.2024.1396391
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/695394
dc.identifier.doi
10.3929/ethz-b-000695394
dc.description.abstract
Introduction: Physical exercise and gravitational load affect the activity of the cardiovascular system. How these factors interact with one another is still poorly understood. Here we investigate how the cardiovascular system responds to leg-press exercise during head-down tilt, a posture that reduces orthostatic stress, limits gravitational pooling, and increases central blood volume. Methods: Seventeen healthy participants performed leg-press exercise during head-down tilt at different combinations of resistive force, contraction frequency, and exercise duration (30 and 60 s), leading to different exercise power. Systolic (sBP), diastolic (dBP), mean arterial pressure (MAP), pulse pressure (PP) and heart rate (HR) were measured continuously. Cardiovascular responses were evaluated by comparing the values of these signals during exercise recovery to baseline. Mixed models were used to evaluate the effect of exercise power and of individual exercise parameter on the cardiovascular responses. Results: Immediately after the exercise, we observed a clear undershoot in sBP (Δ = −7.78 ± 1.19 mmHg), dBP (Δ = −10.37 ± 0.84 mmHg), and MAP (Δ = −8.85 ± 0.85 mmHg), an overshoot in PP (Δ = 7.93 ± 1.13 mmHg), and elevated values of HR (Δ = 33.5 ± 0.94 bpm) compared to baseline (p < 0.0001). However, all parameters returned to similar baseline values 2 min following the exercise (p > 0.05). The responses of dBP, MAP and HR were significantly modulated by exercise power (correlation coefficients: rdBP = −0.34, rMAP = −0.25, rHR = 0.52, p < 0.001). All signals’ responses were modulated by contraction frequency (p < 0.05), increasing the undershoot in sBP (Δ = −1.87 ± 0.98 mmHg), dBP (Δ = −4.85 ± 1.01 and Δ = −3.45 ± 0.98 mmHg for low and high resistive force respectively) and MAP (Δ = −3.31 ± 0.75 mmHg), and increasing the overshoot in PP (Δ = 2.57 ± 1.06 mmHg) as well as the value of HR (Δ = 16.8 ± 2.04 and Δ = 10.8 ± 2.01 bpm for low and high resistive force respectively). Resistive force affected only dBP (Δ = −4.96 ± 1.41 mmHg, p < 0.0001), MAP (Δ = −2.97 ± 1.07 mmHg, p < 0.05) and HR (Δ = 6.81 ± 2.81 bpm, p < 0.0001; Δ = 15.72 ± 2.86 bpm, p < 0.0001; Δ = 15.72 ± 2.86 bpm, p < 0.05, depending on the values of resistive force and contraction frequency), and exercise duration affected only HR (Δ = 9.64 ± 2.01 bpm, p < 0.0001). Conclusion: Leg exercises caused only immediate cardiovascular responses, potentially due to facilitated venous return by the head-down tilt position. The modulation of dBP, MAP and HR responses by exercise power and that of all signals by contraction frequency may help optimizing exercise prescription in conditions of limited orthostatic stress.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Frontiers Media
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
gravitational load
en_US
dc.subject
orthostatic stress
en_US
dc.subject
exercise power
en_US
dc.subject
contraction frequency
en_US
dc.subject
blood pressure
en_US
dc.title
Cardiovascular responses to leg-press exercises during head-down tilt
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Frontiers in Sports and Active Living
ethz.journal.volume
6
en_US
ethz.journal.abbreviated
Front. Sports Act. Living
ethz.pages.start
1396391
en_US
ethz.size
15 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Smart technology for artificial muscle applications in space
en_US
ethz.identifier.wos
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::03654 - Riener, Robert / Riener, Robert
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::03654 - Riener, Robert / Riener, Robert
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::03654 - Riener, Robert / Riener, Robert
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02070 - Dep. Gesundheitswiss. und Technologie / Dep. of Health Sciences and Technology::03654 - Riener, Robert / Riener, Robert
ethz.grant.agreementno
312815
ethz.grant.fundername
EC
ethz.grant.funderDoi
10.13039/501100000780
ethz.grant.program
FP7
ethz.date.deposited
2024-09-23T06:08:20Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2024-09-23T11:38:41Z
ethz.rosetta.lastUpdated
2024-09-23T11:38:41Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.atitle=Cardiovascular%20responses%20to%20leg-press%20exercises%20during%20head-down%20tilt&amp;rft.jtitle=Frontiers%20in%20Sports%20and%20Active%20Living&amp;rft.date=2024-08-27&amp;rft.volume=6&amp;rft.spage=1396391&amp;rft.issn=2624-9367&amp;rft.au=Alessandro,%20Cristiano&amp;Tafreshi,%20Amirehsan%20Sarabadani&amp;Riener,%20Robert&amp;rft.genre=article&amp;rft_id=info:doi/10.3389/fspor.2024.1396391&amp;
 Search print copy at ETH Library

Files in this item

Thumbnail

Publication type

Show simple item record