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Related Concept Videos

Factors Influencing Heart Rate01:30

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The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
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Tachycardia is a condition marked by an abnormally fast or irregular heart rate, surpassing the typical resting rate. In adults, tachycardia is characterized by a pulse rate ranging from 100 to 180 beats per minute. The increased heart rate can result in inadequate blood flow to various body parts, ultimately diminishing the oxygen supply to organs and tissues.
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Change in heart rate variability during two firefighting work cycles.

Philippe Gendron1, Louis Laurencelle1, Claude Lajoie1

  • 1Département des sciences de l'activité physique, Université du Québec à Trois-Rivières, Canada.

International Journal of Occupational Safety and Ergonomics : JOSE
|December 15, 2022
PubMed
Summary

Shorter recovery periods between firefighting work bouts significantly decrease heart rate variability (HRV). This reduction in HRV may be linked to impaired parasympathetic nervous system reactivation and elevated body temperature.

Keywords:
autonomicbody temperaturecardiacfirefighterparasympatheticrehabilitation

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Area of Science:

  • Occupational Health
  • Cardiovascular Physiology
  • Exercise Physiology

Background:

  • Firefighting involves strenuous work with intermittent recovery periods.
  • Understanding the impact of work-rest cycles on physiological recovery is crucial for firefighter well-being.
  • Heart rate variability (HRV) is a key indicator of autonomic nervous system function and recovery.

Purpose of the Study:

  • To investigate how different recovery durations between firefighting work bouts affect changes in heart rate variability (HRV).
  • To examine the influence of work cycles on physiological recovery markers in firefighters.
  • To assess the relationship between recovery time, HRV, and body temperature.

Main Methods:

  • Thirteen male firefighters participated in two firefighting simulations.
  • Simulations included two 25-minute work bouts with either 20-minute (T20) or 5-minute (T5) passive recovery.
  • Heart rate variability (measured by RMSSD) and aural temperature were recorded pre- and post-simulation.

Main Results:

  • A significantly greater decrease in RMSSD was observed after the T5 simulation compared to T20 (p=0.02).
  • Post-firefighting aural temperature was higher in the T5 condition (37.18°C) than in the T20 condition (36.88°C) (p=0.05).
  • These findings indicate that shorter recovery impairs autonomic recovery.

Conclusions:

  • A 5-minute recovery period between firefighting work bouts leads to reduced post-exercise heart rate variability.
  • This diminished HRV is potentially due to insufficient parasympathetic reactivation.
  • Elevated body temperature during shorter recovery intervals may also contribute to impaired physiological recovery.