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Caffeine-induced changes in cardiovascular function during resistance training.

Todd Anthony Astorino¹, Riana Lee Rohmann, Kelli Firth

¹Department of Kinesiology, California State University, San Marcos, CA 92096-0001, USA.

International Journal of Sport Nutrition and Exercise Metabolism

|November 30, 2007

Summary

Caffeine intake before resistance exercise increases heart rate and blood pressure in men. Monitor caffeine consumption to mitigate potential heart disease risks in at-risk individuals.

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Area of Science:

Exercise Physiology
Cardiovascular Science
Nutritional Biochemistry

Background:

Caffeine is known to increase blood pressure at rest and during exercise.
The combined effects of caffeine and intense resistance training on cardiovascular function remain unclear.

Purpose of the Study:

To investigate the impact of acute caffeine ingestion on cardiovascular responses during fatiguing resistance exercise.
To compare the effects of caffeine versus placebo on heart rate, blood pressure, and rate-pressure product.

Main Methods:

A randomized, double-blind, crossover study involving 22 resistance-trained men.
Participants ingested 6 mg/kg of caffeine or a placebo 1 hour before performing fatiguing bench press and leg press exercises.
Cardiovascular parameters including heart rate and blood pressure were measured before and immediately after exercise.

Main Results:

Caffeine ingestion led to significant increases in heart rate (10 beats/min) and systolic blood pressure (8-10 mmHg) compared to placebo.
Rate-pressure product was also significantly elevated following caffeine consumption.
No significant changes in diastolic blood pressure were observed between the caffeine and placebo conditions.

Conclusions:

Acute caffeine intake amplifies cardiovascular responses during intense resistance exercise in men.
Caution is advised regarding caffeine consumption in at-risk men engaged in resistance training due to potential elevated blood pressure and heart disease risks.