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Time course of haemodynamic changes after maximal exercise

J E Isea¹, M Piepoli, S Adamopoulos

¹Department of Cardiovascular Medicine, John Radcliffe Hospital, Oxford, UK.

European Journal of Clinical Investigation

|December 1, 1994

Summary

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Maximal upright bicycle exercise causes a temporary drop in blood pressure and vasodilation for up to two hours. This exercise-induced hypotension is not solely due to increased body temperature.

Area of Science:

Exercise Physiology
Cardiovascular Physiology

Background:

Understanding the post-exercise cardiovascular response is crucial for exercise prescription.
Previous studies suggest a potential hypotensive effect following exercise, but the duration and mechanisms require further elucidation.

Purpose of the Study:

To investigate the haemodynamic changes for four hours after maximal upright bicycle exercise.
To determine the duration of the post-exercise hypotensive effect and its relation to body temperature.

Main Methods:

A randomized controlled crossover design was employed.
Six healthy subjects performed maximal upright bicycle exercise.
Haemodynamic variables, including total peripheral resistance, vascular bed responses, blood pressure, cardiac index, heart rate, stroke volume, and body temperature, were monitored for four hours post-exercise.

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Main Results:

Total peripheral resistance decreased for two hours post-exercise.
Both exercising and non-exercising vascular beds showed vasodilation for two hours.
Systolic and diastolic blood pressures were reduced for two hours.
Cardiac index increased for one hour, driven by elevated heart rate; stroke volume remained unchanged.
Body temperature increased for forty minutes.
All haemodynamic variables returned to baseline by three hours.

Conclusions:

The post-exercise hypotensive effect following maximal upright bicycle exercise lasts for approximately three hours.
Elevated body temperature is not the sole factor contributing to exercise-induced hypotension.