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Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity

INTRODUCTION: Adequate cardiorespiratory fitness is of utmost importance during spaceflight and should be assessable via moderate work rate intensities, e.g., using kinetics parameters. The combination of restricted sleep, and defined physical exercise during a 45-day simulated space mission is expe...

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Autores principales: Koschate, Jessica, Drescher, Uwe, Hoffmann, Uwe
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8357778/
https://www.ncbi.nlm.nih.gov/pubmed/34080066
http://dx.doi.org/10.1007/s00421-021-04719-z
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author Koschate, Jessica
Drescher, Uwe
Hoffmann, Uwe
author_facet Koschate, Jessica
Drescher, Uwe
Hoffmann, Uwe
author_sort Koschate, Jessica
collection PubMed
description INTRODUCTION: Adequate cardiorespiratory fitness is of utmost importance during spaceflight and should be assessable via moderate work rate intensities, e.g., using kinetics parameters. The combination of restricted sleep, and defined physical exercise during a 45-day simulated space mission is expected to slow heart rate (HR) kinetics without changes in oxygen uptake ([Formula: see text] ) kinetics. METHODS: Overall, 14 crew members (9 males, 5 females, 37 ± 7 yrs, 23.4 ± 3.5 kg m(−2)) simulated a 45-d-mission to an asteroid. During the mission, the sleep schedule included 5 nights of 5 h and 2 nights of 8 h sleep. The crew members were tested on a cycle ergometer, using pseudo-random binary sequences, changing between 30 and 80 W on day 8 before (MD-8), day 22 (MD22) and 42 (MD42) after the beginning and day 4 (MD + 4) following the end of the mission. Kinetics information was assessed using the maxima of cross-correlation functions (CCF(max)). Higher CCF(max) indicates faster responses. RESULTS: CCF(max)(HR) was significantly (p = 0.008) slower at MD-8 (0.30 ± 0.06) compared with MD22 (0.36 ± 0.06), MD42 (0.38 ± 0.06) and MD + 4 (0.35 ± 0.06). Mean HR values during the different work rate steps were higher at MD-8 and MD + 4 compared to MD22 and MD42 (p < 0.001). DISCUSSION: The physical training during the mission accelerated HR kinetics, but had no impact on mean HR values post mission. Thus, HR kinetics seem to be sensitive to changes in cardiorespiratory fitness and may be a valuable parameter to monitor fitness. Kinetics and capacities adapt independently in response to confinement in combination with defined physical activity and sleep.
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spelling pubmed-83577782021-08-30 Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity Koschate, Jessica Drescher, Uwe Hoffmann, Uwe Eur J Appl Physiol Original Article INTRODUCTION: Adequate cardiorespiratory fitness is of utmost importance during spaceflight and should be assessable via moderate work rate intensities, e.g., using kinetics parameters. The combination of restricted sleep, and defined physical exercise during a 45-day simulated space mission is expected to slow heart rate (HR) kinetics without changes in oxygen uptake ([Formula: see text] ) kinetics. METHODS: Overall, 14 crew members (9 males, 5 females, 37 ± 7 yrs, 23.4 ± 3.5 kg m(−2)) simulated a 45-d-mission to an asteroid. During the mission, the sleep schedule included 5 nights of 5 h and 2 nights of 8 h sleep. The crew members were tested on a cycle ergometer, using pseudo-random binary sequences, changing between 30 and 80 W on day 8 before (MD-8), day 22 (MD22) and 42 (MD42) after the beginning and day 4 (MD + 4) following the end of the mission. Kinetics information was assessed using the maxima of cross-correlation functions (CCF(max)). Higher CCF(max) indicates faster responses. RESULTS: CCF(max)(HR) was significantly (p = 0.008) slower at MD-8 (0.30 ± 0.06) compared with MD22 (0.36 ± 0.06), MD42 (0.38 ± 0.06) and MD + 4 (0.35 ± 0.06). Mean HR values during the different work rate steps were higher at MD-8 and MD + 4 compared to MD22 and MD42 (p < 0.001). DISCUSSION: The physical training during the mission accelerated HR kinetics, but had no impact on mean HR values post mission. Thus, HR kinetics seem to be sensitive to changes in cardiorespiratory fitness and may be a valuable parameter to monitor fitness. Kinetics and capacities adapt independently in response to confinement in combination with defined physical activity and sleep. Springer Berlin Heidelberg 2021-06-02 2021 /pmc/articles/PMC8357778/ /pubmed/34080066 http://dx.doi.org/10.1007/s00421-021-04719-z Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Original Article
Koschate, Jessica
Drescher, Uwe
Hoffmann, Uwe
Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
title Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
title_full Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
title_fullStr Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
title_full_unstemmed Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
title_short Confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
title_sort confinement, partial sleep deprivation and defined physical activity–influence on cardiorespiratory regulation and capacity
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8357778/
https://www.ncbi.nlm.nih.gov/pubmed/34080066
http://dx.doi.org/10.1007/s00421-021-04719-z
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