Key result
J receptor stimulation during strenuous exercise induces reflex bradycardia and terminates exercise to reduce pulmonary capillary pressure and protect pulmonary arteries from rupture.
Why the study?
Neural mechanisms regulating the increase in ventilation and cardiac output during and prior to rapid locomotion required investigation.
J receptor reflexes play a protective physiological role during strenuous exercise by inducing bradycardia and terminating exertion to prevent pulmonary arteriole rupture.
Answers are grounded in this paper and cite their sources.
J-receptor reflexes may limit exercise in lung disease; leaves open targeted human trials before any clinical role.
A great increase in ventilation and cardiac output is set off by and even before rapid locomotion begins. An investigation into the neural mechanisms involved revealed that the subsequent increase in pulmonary blood flow stimulates J or juxtapulmonary capillary receptors that lie in the pulmonary parenchyma. Reflexes arising from stimulation of these sensory receptors are an increase in ventilation accompanied by sensations of breathlessness, bradycardia and reduction or stopping of exercise. Of these, the significance of reflex bradycardia is to reduce the great rise in pulmonary capillary pressure during strenuous exercise and protect the pulmonary arterioles from rupture as they are vulnerable to mechanical stress.
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Ashima Anand (2023) conducted a review in Exertional breathlessness and pulmonary capillary pressure. J receptor stimulation was evaluated on Reflex termination of exercise and bradycardia. J receptor stimulation during strenuous exercise induces reflex bradycardia and terminates exercise to reduce pulmonary capillary pressure and protect pulmonary arteries from rupture.
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