Resting Heart Rate Changes and Anxiety Symptoms - Cardiology

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Resting heart rate (RHR) is an important indicator of cardiovascular health and overall fitness. The normal range for resting heart rate in adults typically falls between 60 to 100 beats per minute (bpm). However, athletes or individuals who are very physically fit may have resting heart rates below 60 bpm, sometimes reaching as low as 40 bpm. Your observations of a resting heart rate fluctuating between 70 and 74 bpm, and then dropping to 70 or even 68 bpm, are still within the normal range, especially considering the context of your lifestyle changes and stress levels.

Several factors can influence resting heart rate, including physical fitness, stress, anxiety, sleep quality, and overall health. Given your recent experiences with irregular sleep patterns due to the demands of school, it is entirely plausible that your resting heart rate has been affected. Sleep deprivation can lead to increased sympathetic nervous system activity, which may elevate heart rate during waking hours, but it can also lead to fluctuations in resting heart rate.
Your history of mitral valve regurgitation and autonomic nervous system dysregulation can also play a role in how your heart rate responds to stress and anxiety. The autonomic nervous system, which includes the sympathetic and parasympathetic branches, regulates heart rate. When you experience anxiety or stress, the sympathetic nervous system can become more active, potentially leading to an increased heart rate. Conversely, relaxation and deep breathing can activate the parasympathetic nervous system, which may lower your heart rate.

The symptoms you describe, such as feeling fatigued, anxious, and experiencing a sensation similar to hyperventilation, can indeed be linked to sleep deprivation and autonomic nervous system imbalances. When you are anxious or stressed, you may unconsciously alter your breathing pattern, leading to feelings of lightheadedness or fatigue. This can create a cycle where anxiety leads to physical symptoms, which in turn increases anxiety.

In terms of your resting heart rate dropping to 68 or 69 bpm, this is still considered normal, especially if you are not experiencing any adverse symptoms such as dizziness, chest pain, or significant shortness of breath. However, if you notice persistent changes in your heart rate, or if your symptoms of anxiety and fatigue continue to worsen, it would be advisable to consult with a healthcare professional. They may recommend further evaluation, including monitoring your heart rate variability, assessing your sleep quality, and possibly exploring strategies to manage anxiety and stress.

In summary, fluctuations in resting heart rate can be influenced by various factors, including lifestyle changes, stress, and underlying health conditions. Your current resting heart rate of 70-74 bpm, and even lower values, can be considered normal, particularly in the context of your recent stressors. However, maintaining a healthy lifestyle, managing stress, and ensuring adequate sleep are crucial for overall well-being and can help stabilize your heart rate. If your symptoms persist or worsen, seeking medical advice would be a prudent step.