Impact of Blood Pressure and Heart Rate Responses During Exercise

Link to Hypertension and Cardiovascular Disease

An exaggerated increase in blood pressure and heart rate during physical activity may be associated with a heightened risk of developing hypertension and cardiovascular diseases. A new study conducted by Notay and colleagues, published in the Journal of Physiology, explores genetic factors that contribute to these physiological responses.

Variation in Individual Responses

Individuals exhibit different responses to exercise, particularly concerning heart rate. Elevated blood pressure during physical activity correlates with a greater risk of hypertension and cardiovascular mortality. This variation might stem from differences in the nervous system pathways that relay feedback from muscles to the brain. However, the origins of this variation and its connection to future health risks remain unclear, with some evidence suggesting that genetic factors could be influential.

Study Overview by Notay and Colleagues

Research Methodology

In their research, Notay and colleagues analyzed genetic influences on blood pressure and heart rate during exercise. The study involved 91 healthy men and 109 healthy women, primarily of European descent. Researchers measured participants’ heart rates and blood pressure during both a resting phase and periods of physical or mental stress. Genetic data were also collected, focusing on five specific locations known from prior studies.

Findings on Gene Variants

The study identified two rare gene variants associated with elevated blood pressure responses following exercise. Individuals carrying variants in the TRPV1 and BDKRB2 genes exhibited blood pressure responses that were 22 to 23% higher than those without these variants. These genes appear to play a significant role in mediating how muscles respond to stress, affecting both heart rate and blood pressure independently and additively.

Implications for Heart Health

Genetic Mutations and Cardiovascular Risk

The findings suggest that genetic mutations in TRPV1 and BDKRB2 may lead to an overactive heart muscle, potentially increasing the risk of cardiovascular-related mortality. Recognizing genetic risk factors for hypertension and cardiovascular diseases is crucial for identifying individuals at risk and developing targeted treatment protocols to mitigate their risk.

Future Research Directions

Further studies are necessary to examine genetic variants in individuals already diagnosed with hypertension, enhancing understanding of how these factors contribute to cardiovascular health.

Reference

Notay et al. (Accepted article) TRPV1 and BDKRB2 receptor polymorphisms can influence the exercise pressor reflex. Journal of Physiology DOI: 10.1113/JP276526