Time-series analysis of heart rate and blood pressure in response to changes in work rate before and after 60 days of 6 degrees head down tilt bed rest

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Time-series analysis of heart rate and blood pressure in response to changes in work rate before and after 60 days of 6 degrees head down tilt bed rest. / Koschate, Jessica; Thieschäfer, Lutz; Drescher, Uwe et al.

In: European journal of applied physiology, Vol. 121, No. 4, 29.12.2020, p. 1037-1048.

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@article{7de700a36fcc4e5880311fed61d677f9,
title = "Time-series analysis of heart rate and blood pressure in response to changes in work rate before and after 60 days of 6 degrees head down tilt bed rest",
abstract = "Purpose: Cardiovascular regulation during exercise, described using time series analysis, is expected to be attenuated after bed rest (BR) and this effect will be dampened by a reactive jumps countermeasure. Methods: Twenty subjects (29 ± 6 years, 23.6 ± 1.7 kg m−2) were tested on a cycle ergometer 9 days (BDC-9) before the beginning of BR as well as 2 (R + 2) and 13 days (R + 13) after the end of BR, applying moderate pseudo-random binary (PRBS) work rate changes. Heart rate (HR) and mean arterial blood pressure (mBP) were measured beat-to-beat and interpolated to 1 s intervals. HR and mBP were cross-correlated [CCF(HR-mBP)] during the PRBS. Eleven subjects participated in a reactive jump countermeasure (JUMP) during the BR period, the other part of the group served as control group (CTRL). Results: In the CTRL group, significantly lower CCF(HR-mBP) values during BDC-9 were observed compared to R + 2 during the lags 20–25 s and significantly higher values during the lags − 39 s to − 35 s. In the JUMP group, significantly lower CCFs were only observed at R + 2 compared with BDC-9 during the lags 23 s and 24 s, whereas the CCFs for BDC-9 were significantly higher at several lags compared with R + 13. Conclusion: Attenuations in the regulation of the cardiovascular system during cycling exercise after BR were found in the CTRL group of the RSL study. Cardiovascular regulation in the JUMP group was improved compared to values before the beginning of BR, suggesting the effectiveness of the reactive jumps countermeasure to mitigate the deleterious effects of prolonged BR.",
keywords = "Bed rest, Cardiovascular reflex responses, Time series analysis",
author = "Jessica Koschate and Lutz Thiesch{\"a}fer and Uwe Drescher and T. Zieschang and U. Hoffmann",
year = "2020",
month = dec,
day = "29",
doi = "10.1007/s00421-020-04576-2",
language = "English",
volume = "121",
pages = "1037--1048",
journal = "European journal of applied physiology",
issn = "1439-6319",
publisher = "Springer Verlag",
number = "4",

}

RIS

TY - JOUR

T1 - Time-series analysis of heart rate and blood pressure in response to changes in work rate before and after 60 days of 6 degrees head down tilt bed rest

AU - Koschate, Jessica

AU - Thieschäfer, Lutz

AU - Drescher, Uwe

AU - Zieschang, T.

AU - Hoffmann, U.

PY - 2020/12/29

Y1 - 2020/12/29

N2 - Purpose: Cardiovascular regulation during exercise, described using time series analysis, is expected to be attenuated after bed rest (BR) and this effect will be dampened by a reactive jumps countermeasure. Methods: Twenty subjects (29 ± 6 years, 23.6 ± 1.7 kg m−2) were tested on a cycle ergometer 9 days (BDC-9) before the beginning of BR as well as 2 (R + 2) and 13 days (R + 13) after the end of BR, applying moderate pseudo-random binary (PRBS) work rate changes. Heart rate (HR) and mean arterial blood pressure (mBP) were measured beat-to-beat and interpolated to 1 s intervals. HR and mBP were cross-correlated [CCF(HR-mBP)] during the PRBS. Eleven subjects participated in a reactive jump countermeasure (JUMP) during the BR period, the other part of the group served as control group (CTRL). Results: In the CTRL group, significantly lower CCF(HR-mBP) values during BDC-9 were observed compared to R + 2 during the lags 20–25 s and significantly higher values during the lags − 39 s to − 35 s. In the JUMP group, significantly lower CCFs were only observed at R + 2 compared with BDC-9 during the lags 23 s and 24 s, whereas the CCFs for BDC-9 were significantly higher at several lags compared with R + 13. Conclusion: Attenuations in the regulation of the cardiovascular system during cycling exercise after BR were found in the CTRL group of the RSL study. Cardiovascular regulation in the JUMP group was improved compared to values before the beginning of BR, suggesting the effectiveness of the reactive jumps countermeasure to mitigate the deleterious effects of prolonged BR.

AB - Purpose: Cardiovascular regulation during exercise, described using time series analysis, is expected to be attenuated after bed rest (BR) and this effect will be dampened by a reactive jumps countermeasure. Methods: Twenty subjects (29 ± 6 years, 23.6 ± 1.7 kg m−2) were tested on a cycle ergometer 9 days (BDC-9) before the beginning of BR as well as 2 (R + 2) and 13 days (R + 13) after the end of BR, applying moderate pseudo-random binary (PRBS) work rate changes. Heart rate (HR) and mean arterial blood pressure (mBP) were measured beat-to-beat and interpolated to 1 s intervals. HR and mBP were cross-correlated [CCF(HR-mBP)] during the PRBS. Eleven subjects participated in a reactive jump countermeasure (JUMP) during the BR period, the other part of the group served as control group (CTRL). Results: In the CTRL group, significantly lower CCF(HR-mBP) values during BDC-9 were observed compared to R + 2 during the lags 20–25 s and significantly higher values during the lags − 39 s to − 35 s. In the JUMP group, significantly lower CCFs were only observed at R + 2 compared with BDC-9 during the lags 23 s and 24 s, whereas the CCFs for BDC-9 were significantly higher at several lags compared with R + 13. Conclusion: Attenuations in the regulation of the cardiovascular system during cycling exercise after BR were found in the CTRL group of the RSL study. Cardiovascular regulation in the JUMP group was improved compared to values before the beginning of BR, suggesting the effectiveness of the reactive jumps countermeasure to mitigate the deleterious effects of prolonged BR.

KW - Bed rest

KW - Cardiovascular reflex responses

KW - Time series analysis

UR - https://www.mendeley.com/catalogue/d075a6ba-d74e-3f7d-b6b8-d23a272c254e/

U2 - 10.1007/s00421-020-04576-2

DO - 10.1007/s00421-020-04576-2

M3 - Journal articles

C2 - 33427969

VL - 121

SP - 1037

EP - 1048

JO - European journal of applied physiology

JF - European journal of applied physiology

SN - 1439-6319

IS - 4

ER -

ID: 6127244