Your genes determine how your heart rate responds to exercise

Your genes can determine how your heart rate and blood pressure respond to exercise – and may act as an early warning of future problems with your heart or blood vessels – according to new research published in The Journal of Physiology.

When people exercise, their heart rate and blood pressure increase. However, the magnitude of this increase is different for different people. Previous research has shown that abnormally large increases in blood pressure during exercise makes it more likely that people will suffer from future high blood pressure. Therefore understanding why people react differently to exercise is important as this can help to identify risk factors and enable early monitoring or treatment of individuals at risk.

Until now it has not been known why the response to exercise varies between different people. This new research has found that genetic differences in receptors found in skeletal muscles can contribute to this different response. Receptors are groups of specialised cells that detect changes in the environment and cause some kind of response. The scientists identified that the presence of two common genetic mutations in receptors found in skeletal muscle led to higher blood pressure during exercise compared to people who did not have them, particularly in men.

The research conducted by the University of Guelph (Canada), involved measuring heart rate and blood pressure of 200 healthy young men and women before and during exercise, plus analysing their DNA for genetic risk factors.

About Author:

Quintus van Rensburg is an Athletics South Africa Certified Coach, registered with Western Province Athletics. He serves on the Western Province Athletics Statistics Standing Committee and on the Bellville Athletics Management Committee as records official, statistician and coach. He competes in road running in distances ranging from 10 km to 100 km, with a focus on endurance events.

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