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Related Experiment Videos

Blood pressure changes during physical exercise (the beat phenomenon).

P Palatini1, P Mormino, L Mos

  • 1Clinica Medica I, University of Padova, Padua, Italy.

Journal of Hypertension. Supplement : Official Journal of the International Society of Hypertension
|December 1, 1988
PubMed
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Running creates a unique blood pressure pattern due to rhythmic aortic shocks from locomotion. This accessory wave, combined with normal heartbeats, explains the observed phenomenon in athletes.

Area of Science:

  • Cardiovascular Physiology
  • Exercise Physiology
  • Biomedical Engineering

Background:

  • Previous research identified a peculiar blood pressure pattern during running, termed the beat phenomenon.
  • The underlying mechanism of this running-induced blood pressure variation remained unclear.

Purpose of the Study:

  • To elucidate the mechanism behind the peculiar blood pressure pattern observed during running.
  • To investigate the contribution of locomotion-induced pressure waves to the overall blood pressure tracing.

Main Methods:

  • Intra-arterial blood pressure was continuously recorded in 10 amateur athletes using the Oxford technique.
  • Athletes carried a pressurized saline-filled container connected to a transducer to record pressure waves synchronized with strides.
  • Computer analysis combined recorded pressure waves with blood pressure tracings from a bicycle ergometric test.

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Main Results:

  • Pressure waves with amplitudes of +/- 10 to +/- 62 mmHg and frequencies matching stride rate were recorded during running.
  • Simulating these waves by adding them to bicycle ergometry blood pressure tracings produced a pattern similar to that observed during running.
  • The running-induced blood pressure pattern is a summation of an accessory wave and the normal sphygmic wave.

Conclusions:

  • The peculiar blood pressure pattern during running is primarily caused by accessory waves generated by rhythmic aortic shocks from locomotion.
  • This study demonstrates that the running-induced blood pressure pattern is a composite of normal cardiac activity and exercise-specific mechanical forces.
  • Understanding this phenomenon provides insight into cardiovascular responses during high-impact physical activity.