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Previous Intensive Running or Swimming Negatively Affects CPR Effectiveness.

J Arturo Abraldes1, Ricardo J Fernandes2,3, Ricardo Morán-Navarro4

  • 1Research Group MS&SPORT, Faculty of Sports Sciences, University of Murcia, 30720 Murcia, Spain.

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Summary

Rescuer fatigue impacts cardiopulmonary resuscitation (CPR) quality. Intense exercise before CPR, like running or swimming, increased physiological stress and ventilation effectiveness but slightly reduced compression quality compared to resting CPR.

Keywords:
CPReffectivenesseffortfatigueoxygen uptakephysiology

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Area of Science:

  • Sports Science
  • Emergency Medicine
  • Physiology

Background:

  • Correct cardiopulmonary resuscitation (CPR) delivery is crucial for survival outcomes.
  • Rescuer fatigue is a significant factor that can compromise CPR effectiveness.
  • Understanding the physiological impact of pre-CPR exercise is essential for optimizing resuscitation protocols.

Purpose of the Study:

  • To investigate the effects of two distinct exercise modes (running and swimming) on CPR effectiveness and physiological responses.
  • To compare CPR performance after intense physical exertion versus a resting baseline condition.

Main Methods:

  • Thirty lifeguards performed 4 minutes of CPR on an adult manikin with a 30:2 compression-ventilation ratio after either a 100m run or a water rescue, or after a baseline rest period.
  • Physiological variables (oxygen uptake, heart rate) were continuously monitored using a portable gas analyzer.
  • CPR effectiveness (compression and ventilation efficacy) was assessed using high-definition video analysis.

Main Results:

  • Both exercise protocols (CPRrun and CPRswim) resulted in significantly higher oxygen uptake and heart rate compared to the baseline (CPRbase).
  • Compression efficacy was lower following both exercise conditions (63.3% and 62.2%) compared to baseline (69.2%).
  • Ventilation efficacy was higher after intense exercise (49.5% and 51.9%) than baseline (33.5%), with no significant difference between the two exercise modes.

Conclusions:

  • Pre-CPR exercise, specifically running and swimming, induces significant physiological stress.
  • While exercise may slightly decrease compression quality, it enhances ventilation effectiveness during CPR.
  • The findings suggest that physical exertion impacts CPR performance, highlighting the need for training strategies to mitigate fatigue effects.