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Open AccessArticle

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

1
Health Assessment Laboratory, University of Massachusetts Lowell, Lowell, MA 01854, USA
2
Center for Population Health, University of Massachusetts Lowell, Lowell, MA 01854, USA
3
Department of Physical Therapy and Kinesiology, University of Massachusetts Lowell, Lowell, MA 01854, USA
4
Department of Biomedical and Nutritional Sciences, University of Massachusetts Lowell, Lowell, MA 01854, USA
5
Human Performance and Sport Physiology Laboratory, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
6
Department of Occupational Sciences and Technology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2021, 18(1), 109; https://doi.org/10.3390/ijerph18010109
Received: 31 October 2020 / Revised: 17 December 2020 / Accepted: 22 December 2020 / Published: 26 December 2020
(This article belongs to the Special Issue Testing and Physical Conditioning for Tactical Populations)
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 (%MHR0, %MHR15, %MHR30, %MHR45, %MHR60, %MHR120, %MHR180) and absolute HRR values were calculated at 30 s (ΔHRR30), 60 s (ΔHRR60), 120 s (ΔHRR120), and 180 s (ΔHRR180). 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 ΔHRR30, ΔHRR60, and ΔHRR120, and ΔHRR180 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. View Full-Text
Keywords: heart rate recovery; autonomic nervous system function; tactical athletes heart rate recovery; autonomic nervous system function; tactical athletes
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MDPI and ACS Style

Cornell, D.J.; Noel, S.E.; Zhang, X.; Ebersole, K.T. Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study. Int. J. Environ. Res. Public Health 2021, 18, 109. https://doi.org/10.3390/ijerph18010109

AMA Style

Cornell DJ, Noel SE, Zhang X, Ebersole KT. Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study. International Journal of Environmental Research and Public Health. 2021; 18(1):109. https://doi.org/10.3390/ijerph18010109

Chicago/Turabian Style

Cornell, David J.; Noel, Sabrina E.; Zhang, Xiyuan; Ebersole, Kyle T. 2021. "Influence of a Training Academy on the Parasympathetic Nervous System Reactivation of Firefighter Recruits—An Observational Cohort Study" Int. J. Environ. Res. Public Health 18, no. 1: 109. https://doi.org/10.3390/ijerph18010109

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