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In the quest for better health and well-being, there has been a growing focus on tapping into the parasympathetic nervous system. This emphasis on relaxation, mindfulness, and stress reduction is undoubtedly valuable, but it’s crucial to recognize a fundamental truth: the autonomic nervous system (ANS) is never just in one mode. It’s in a perpetual state of flux, maintaining a continuous tug-of-war between its two branches: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).

The misconception of pure parasympathetic dominance

In the pursuit of relaxation and stress reduction, there’s a common misconception that achieving a state of pure PNS dominance is the ultimate goal. While the PNS is indeed responsible for “rest and digest” activities, it’s essential to remember that the ANS is not an on-off switch, but rather a dial — a dynamic system that adjusts to your body’s needs in real-time.

Often referred to as the body’s autopilot, the ANS regulates countless bodily functions without us even realizing it, from heart rate and digestion to respiratory rate and pupil dilation. While it might be tempting to think of the ANS as a binary switch, with one side turning off as the other activates, the reality is far more nuanced.

Our bodies are engaged in a constant tug of war, with the SNS and PNS in a dynamic manner, adjusting their influence according to our physiological and psychological needs. In certain situations, being more dominant in one mode is more beneficial, but remember, pure dominance in either is rare. This continuous interplay between the sympathetic and parasympathetic branches is essential for our overall health and well-being.

The art of balance: when dominance matters

Imagine a lion chasing you through the savannah; your body’s SNS kicks into high gear. Your heart rate soars, your muscles tense, and your senses become razor-sharp – all to help you escape danger and survive. This is a classic example of the SNS taking charge when needed, ensuring your survival in critical moments.

Conversely, during moments of calm and relaxation, the PNS steps in. It slows your heart rate, aids in digestion, and promotes healing and regeneration. When you’re enjoying a peaceful night’s sleep, engaging in mindful meditation, or simply lounging on the couch, the PNS is the star player, ensuring your body rests, recharges, and recovers.

The modern SNS dominance epidemic

The sympathetic nervous system is designed to respond to immediate threats and challenges. However, the relentless demands of the modern world have led many individuals to remain stuck in this heightened state of arousal, even when no immediate danger is present. The result? An imbalance in the autonomic nervous system that can have profound consequences on physical and mental health.

Here’s how SNS dominance affects us:

Chronic stress

Modern life is rife with stressors, from work pressures to financial concerns and constant connectivity through technology. This chronic stress keeps the SNS in overdrive, leading to increased heart rate, shallow breathing, and elevated cortisol levels – all of which can have detrimental effects on health.

Sleep disturbances

SNS dominance often spills into nighttime hours, making it difficult to unwind and achieve restorative sleep. Sleep quality suffers as a result, leaving individuals feeling fatigued and irritable.

Digestive issues

The SNS is not conducive to proper digestion, leading to problems like indigestion, irritable bowel syndrome (IBS), and other gastrointestinal discomforts.

Mental health impact

Persistent SNS activation can contribute to anxiety disorders, depression, and an overall sense of unease.

Reduced immunity

Over time, a continually dominant SNS can weaken the immune system, making individuals more susceptible to illnesses and infections.

Quantifying the autonomic nervous system balance with Biostrap

Understanding this delicate balance within the ANS can seem complex, but wearable technology like the Biostrap Kairos makes it accessible and actionable. Biostrap provides a comprehensive view of your ANS activity, allowing you to fine-tune your lifestyle choices for better health and well-being.

Biostrap’s newest device, Kairos, matched with the Vital Science app, empowers users with real-time insight into how much that ANS dial is turned toward PNS or SNS in at any given time of the day.

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Kairos provides:

Real-time spot check: Kairos offers an assessment of your ANS balance, giving you a dynamic view of your body’s state at any point during the day.

Lifestyle insights: Kairos can reveal how certain lifestyle interventions, such as exercise, meditation, or dietary choices, impact your ANS balance.

Actionable guidance: With this data-driven insight, you can make informed decisions about your daily routines, optimizing your activities to achieve better ANS balance.

In a world where the focus on relaxation and parasympathetic nervous system activation is growing, Biostrap provides the tools to help you navigate the delicate balance of your autonomic nervous system. It empowers you to recognize and respond to your body’s needs, whether it’s a burst of energy for a challenging task or a deep sense of relaxation for restorative sleep. Remember, it’s not about switching a switch on and off, it’s about learning to toggle the dial back and forth of your ANS for a healthier, more optimal, and more balanced life.

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Elite athletes use Heart Rate Variability (HRV), resting heart rate and other metrics to manage their training regimens and recovery time. Intense training stresses the muscles, hormones, heart and lungs. By tracking these biometrics, athletes optimize their mix of recovery time and training. They train smarter, not just harder. Exercise is a form of physical stress. Mental and emotional stress also affect your body.

Both mental and physical stress may disrupt homeostasis. This can lead to metabolism issues, insomnia, heart problems, hormonal imbalances, and chronic illness. Stress management and stress reduction improve both quality and quantity of life. You can use HRV and other key biometrics to track the success of your stress management program and to plan for “recovery” just like an elite athlete.

Before we discuss applications, it helps if you understand what these biometrics measure and how stress may alter these readings in the short and long term.

How Stress Affects Your Heart and Your Oxygen Levels

Heart Rate and Stress

Most health-conscious people recognize that stress impacts well-known metrics like heart rate and blood pressure. Have you ever found that your pulse and blood pressure were higher than normal at the dentist’s office? If so, you experienced this phenomenon.

Resting heart rate measures how fast your heart beats while you rest. Many people take a resting heart rate in the morning as a quick barometer to their cardiovascular health.  Your heart rate varies day to day, and moment to moment. The following factors may alter day-to-day resting heart rate:

  • Caffeine consumption
  • The previous day’s workout
  • Quality of sleep
  • Hydration levels
  • Hormone cycle fluctuations
  • A large meal or alcohol the night before
  • Stress levels

If you consistently follow a well-designed training plan you may find that your average resting heart rate decreases along with improvements in your physical fitness.

However, as a measure resting heart rate is limited. Due to genetics, some people just have faster resting heart rates than other people. Some hormone imbalances like low thyroid levels may decrease your average resting heart rate. Due to these reasons, you may benefit even more from tracking more sophisticated data points.

SPO2 and Stress

SpO2 stands for peripheral capillary oxygen saturation. It estimates how saturated your blood is with oxygen. A healthy, fit person usually sees a SpO2 between 95% – 100%. Illness, altitude, heart disease, smoke inhalation all affect SpO2.

Your SpO2 measure may not vary quite as much as your resting heart rate and HRV, but a sudden drop often indicates stress to your body. Traditionally athletes who train in higher elevations track SPO2 to help ensure they are getting enough oxygen. With the right device this is an easy metric to track along with resting pulse.

HRV and Stress

HRV measures time between your heart beats. When you are at an optimal state of rest and wellness, your heart is ready to respond to life’s demands. The space between heartbeats varies a little depending on your needs. When your system is “stressed,” your resting heart rate may appear the same, but there may be less variation between the heartbeats.

Tracking HRV informs you of subtle changes. For example, people sometimes find their HRV decreases a couple days before they notice cold or flu symptoms.

Factors that influence HRV include:

  • Quantity and quality of sleep
  • The previous day’s workout
  • Caffeine or alcohol consumption
  • Emotional and mental stress
  • Nutritional habits
  • Hormonal fluctuations
  • Illness or injury

To learn more about these metrics, download our free white paper “The Definitive Guide To A Healthy Heart.” In the meantime, the following tips and techniques help you manage your stress.

Five Techniques To Use Biometrics in Your Stress Management Program

Take Baseline Readings

Take regular, ideally daily, readings since many factors affect biomarkers like HRV and resting heart rate. Try to take the measurements at a consistent time under similar conditions. For example, you may take your baseline reading shortly after you wake up, before you eat or drink anything, and while relaxing. A higher HRV reflects a more optimal state than a lower HRV reading. A lower resting heart rate or pulse also reflects a more relaxed state.

If you notice your HRV and SPO2 trending upwards, this is a sign that your wellness and stress management efforts are working. If your resting heart rate and blood pressure trend downward, this is also a sign of success.

Look at the Big Picture

Have you ever heard the phrase “fighting fit”? In general, maintaining a high fitness level prepares your body to better deal with stress. However, the combination of acute emotional stress *and* physical stress from a vigorous workout may weaken your body and mind. Factor your stress levels with your workouts. Take it easy if you are dealing with major stress like a family emergency or a big deadline.

Light-to-moderate exercise like walking, yoga, dancing, or recreational sports may give you an outlet to recover from stress. Alternately, in some cases you may actually benefit more from a power nap or practicing relaxation techniques than a workout if your stress levels are very high.

Consider Yoga, Tai Chi, or Meditation

Since deep breathing and relaxation temporarily elevate HRV (and lower pulse) these markers may also help guide your practice. Emerging research indicates mindful practices like yoga and tai chi may increase HRV, SPO2 and decrease blood pressure and resting pulse. Some tech-friendly yogis even take an HRV reading during relaxation post at the end of their practice.

Reduce or Manage Your Life Stress

Athletes don’t want to overtrain as they prepare for either a marathon or a sprinting race. The same applies to you while working on big projects, moving, or experiencing another major life change. If possible, simplify your life. Learn to say no and avoid taking on too much.

Take Care of Yourself

Generally when you take good care of yourself, your HRV, SPO2, and resting heart rate tend to improve. Even better, your body and mind are ready to face life’s challenges. The following healthy choices may improve your HRV in both the short and long term:

  • Get enough sleep
  • Eat a healthy, balanced diet
  • Drink enough fluids
  • Enjoy moderate activity most days and improve or maintain your physical fitness
  • Avoid smoking
  • Spend a few minutes relaxing each day whether you prefer to meditate, pray, do yoga, or practice breathing exercises.

Take control of your stress levels and your fitness. You can customize your lifestyle and measure results by tracking key metrics like HRV, SPO2, and resting heart rate. In the past, only elite athletes had this opportunity, but now these tools are  available to you. Thanks to fitness wearables like Biostrap you can easily take these metrics at home.

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