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Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study

Sudden cardiac death (SCD) is the leading type of line-of-duty death among firefighters. An inability to restore parasympathetic nervous system (PSNS) control after activity is associated with SCD. Post-exercise heart rate recovery (HRR) provides unique insight into reactivation of the PSNS. Thus, t...

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Autores principales: Cornell, David J., Noel, Sabrina E., Zhang, Xiyuan, Ebersole, Kyle T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7795559/
https://www.ncbi.nlm.nih.gov/pubmed/33375223
http://dx.doi.org/10.3390/ijerph18010109
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author Cornell, David J.
Noel, Sabrina E.
Zhang, Xiyuan
Ebersole, Kyle T.
author_facet Cornell, David J.
Noel, Sabrina E.
Zhang, Xiyuan
Ebersole, Kyle T.
author_sort Cornell, David J.
collection PubMed
description Sudden cardiac death (SCD) is the leading type of line-of-duty death among firefighters. An inability to restore parasympathetic nervous system (PSNS) control after activity is associated with SCD. Post-exercise heart rate recovery (HRR) provides unique insight into reactivation of the PSNS. Thus, the purpose of this study was to examine longitudinal changes in HRR responses of 25 male firefighter recruits. HR data were collected after submaximal exercise at week 1 (W1), week 6 (W6), and week 15 (W15) of their training at an academy. Percent maximal heart rate (%MHR) measures were computed at each HRR time point (%MHR(0), %MHR(15), %MHR(30), %MHR(45), %MHR(60), %MHR(120), %MHR(180)) and absolute HRR values were calculated at 30 s (ΔHRR(30)), 60 s (ΔHRR(60)), 120 s (ΔHRR(120)), and 180 s (ΔHRR(180)). After controlling for age and percent body fat, there was no statistically significant interaction between Week × HRR (p = 0.730), and there were no changes in ΔHRR(30), ΔHRR(60), and ΔHRR(120), and ΔHRR(180) indices across time. However, %MHR at W6 and W15 was significantly lower than %MHR at W1 at every HRR time point (ps < 0.001). Therefore, although the firefighter recruit training academy elicited positive training adaptations, changes in PSNS reactivation after submaximal activity were not identified.
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spelling pubmed-77955592021-01-10 Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study Cornell, David J. Noel, Sabrina E. Zhang, Xiyuan Ebersole, Kyle T. Int J Environ Res Public Health Article Sudden cardiac death (SCD) is the leading type of line-of-duty death among firefighters. An inability to restore parasympathetic nervous system (PSNS) control after activity is associated with SCD. Post-exercise heart rate recovery (HRR) provides unique insight into reactivation of the PSNS. Thus, the purpose of this study was to examine longitudinal changes in HRR responses of 25 male firefighter recruits. HR data were collected after submaximal exercise at week 1 (W1), week 6 (W6), and week 15 (W15) of their training at an academy. Percent maximal heart rate (%MHR) measures were computed at each HRR time point (%MHR(0), %MHR(15), %MHR(30), %MHR(45), %MHR(60), %MHR(120), %MHR(180)) and absolute HRR values were calculated at 30 s (ΔHRR(30)), 60 s (ΔHRR(60)), 120 s (ΔHRR(120)), and 180 s (ΔHRR(180)). After controlling for age and percent body fat, there was no statistically significant interaction between Week × HRR (p = 0.730), and there were no changes in ΔHRR(30), ΔHRR(60), and ΔHRR(120), and ΔHRR(180) indices across time. However, %MHR at W6 and W15 was significantly lower than %MHR at W1 at every HRR time point (ps < 0.001). Therefore, although the firefighter recruit training academy elicited positive training adaptations, changes in PSNS reactivation after submaximal activity were not identified. MDPI 2020-12-26 2021-01 /pmc/articles/PMC7795559/ /pubmed/33375223 http://dx.doi.org/10.3390/ijerph18010109 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Cornell, David J.
Noel, Sabrina E.
Zhang, Xiyuan
Ebersole, Kyle T.
Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study
title Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study
title_full Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study
title_fullStr Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study
title_full_unstemmed Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study
title_short Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study
title_sort influence of a training academy on the parasympathetic nervous system reactivation of firefighter recruits—an observational cohort study
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7795559/
https://www.ncbi.nlm.nih.gov/pubmed/33375223
http://dx.doi.org/10.3390/ijerph18010109
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