If you've been a long-time podcast listener, then you're no doubt familiar with Dr. Jay T. Wiles, my jolly sidekick on the regular Ben Greenfield Fitness Q&A podcast episodes.

What you may not know about Dr. Wiles is that he is a true expert in all things heart rate variability (HRV) testing, tracking, and interpretation; and in this podcast episode, he takes a deep dive into how to use HRV to optimize your recovery, performance, sleep, stress, and nervous system.

Dr. Wiles is a clinical health psychologist with a passion for helping others reach their full potential from an integrative and holistic perspective. With this strong passion for integrative and holistic care, especially in nutrition and psychophysiology, Dr. Wiles completed his doctor of clinical psychology degree at Regent University with a specialized focus and concentration in health psychology.

Dr. Wiles then furthered this specialty in health psychology as a pre-doctoral intern at McGuire VA Medical Center in Richmond, VA and post-doctoral fellowship at WJB Dorn VA Medical Center in Columbia, SC. He currently works as a health psychologist for the Department of Veteran Affairs.

With specialized training in health behavior coaching, health assessment, nutritional interventions for mental and physical health, motivational interviewing, applied psychophysiology (biofeedback and neurofeedback) and consultation, Dr. Wiles works as a consultant for companies, organizations, practitioners, and individual patients on nutritional psychology, health behavior change, applied psychophysiology, and health promotion/disease prevention via complementary and integrative practices. He is also board certified in biofeedback and heart rate variability biofeedback as well as board-certified in Tai Chi for rehabilitation.

Dr. Wiles has worked closely with elite athletes and executives on enhancing peak performance through his online consulting agency, Thrive Wellness and Performance. This consulting agency focuses solely on training and regulating psychophysiology for performance. ​He is passionate about education and consultation with patients and organizations in an effort to increase health outcomes through focusing on prevention and well-being, as opposed to disease and symptom mitigation. During this solosode with Dr. Jay, you'll discover: -Jay's background and a brief overview of "biofeedback"...7:16 
Biofeedback: the use of your physiology to enhance self-awareness in order to promote self-regulation
Like learning an instrument: perform an action, observe the results, repeat until the desired result has been met
HRV is the most fundamental building block of biofeedback
Thrive Wellness and Performance website
Drjaywiles.com -Research on the use of HRV as a metric and HRV Biofeedback...11:43 
Wellness, Performance, Recovery, and Mental Well-being
Robust research on HRV began only 20-30 years ago
HRV is linked to heart attacks, strokes, physical performance
Optimized recovery, sleep, homeostasis of nervous system, and much more...
Higher stress (real or perceived) resulted in lower HRV scores
Association for Applied Psychophysiology and Biofeedback (AAPB) -Overview of Psychophysiology...18:46 
Central Nervous System and Peripheral Nervous System
Autonomic Nervous System 
Parasympathetic Versus the Sympathetic Response
Autonomic Balance
Baroreflex Response 
Acetylcholine Response
BGF podcast w/ Dr. Koniver on cortisol
Book: Why Zebras Don't Get Ulcers by Robert Sapolsky -What Is Heart Rate Variability...39:55 
PPG vs. ECG
Metric of resiliency to change
Sources of HRV 
Respiratory Sinus Arrhythmia (RSA)
Autonomic Balance -Metrics of Heart Rate Variability...49:19 
Defining different domains
Time domain 
SDNN
RMSSD
HR Max-HR Min or heart rate amplitude
Frequency Domain 
ULF
VLF
LF/HF Ratio -HRV Norms...1:12:00 
Defining Norm-based HRV comparisons
High vs. Low HRV
Voss 2015 Norm Study of Gender and Age
Values for all norms found in 21,000 participants
Norm vs. Individual baseline comparisons -HRV Training/Regulation...1:23:45 
Resonance Frequency Training 
Effortless, low and slow, diaphragmatic breathing
Patrick McKeown style breathing (Book: The Oxygen Advantage)
Use of Wearable technology for biofeedback 
Pros and Cons
Different Devices: 
Whoop Band
Biostrap
Polar H7 Strap w/ Elite HRV or Nature Beat App
Dr. Wiles’ favorite device: Lief Therapeutics
Pitfalls of Wearables 
Artifact: Ectopic or false beats
Many devices do not remove these in their data inclusion
Book: The Oxygen Advantage -HRV Hacks...1:42:00 
Cold Exposure: 
Hot/Cold Contrast showers
Cold Plunges/Immersion
Cold when sleep (core body temp)
Exercise
Mindfulness and Compassion Exercises
Dietary Considerations
Fasting -Stephen Porges' Polyvagal Theory...1:51:09 -And much more... Resources mentioned in this episode: 
Oura Ring
BGF podcast w/ Dr. Koniver on cortisol
Book: Why Zebras Don't Get Ulcers by Robert Sapolsky
Whoop Band
Biostrap
Polar H7 Strap w/ Elite HRV
Nature Beat App
Lief Therapeutics (code GREENFIELD for 20% off their first month of subscription or full purchase of the device)
Book: The Oxygen Advantage
The Christian Gratitude Journal
Book: The Polyvagal Theory by Stephen Porges Episode sponsors: 

-Kion Flex: The ultimate recovery formula, Kion Flex is a bioavailable blend to support joint comfort, mobility and flexibility, and bone health. Ben Greenfield Fitness listeners, receive a 20% discount off your entire order at Kion when you use discount code: BGF20. -X3 Bar: Grow muscle 3x faster than you can with free weights! The X3 Bar will change the way you train forever. Get a $50 discount off your X3 bar when you use discount code: BEN -JOOVV: After using the Joovv for close to 2 years, it's the only light therapy device I'd ever recommend. Give it a try: you won't be disappointed. Order using my link and receive my brand new book, Boundless absolutely free! -Seed Daily Synbiotic: A formulation of 24 unique strains, each of which included at their clinically verified dose, to deliver systemic benefits in the body. Save 15% off your order when you use discount code: BEN15 Do you have a question for me or Jay about this podcast episode? Leave your thoughts, questions, and feedback below!

If you've been a long-time podcast listener, then you're no doubt familiar with Dr. Jay T. Wiles, my jolly sidekick on the regular Ben Greenfield Fitness Q&A podcast episodes. What you may not know about Dr. Wiles is that he is a true expert in all things heart rate variability (HRV) testing, tracking, and interpretation; and in this podcast episode, he takes a deep dive into how to use HRV to optimize your recovery, performance, sleep, stress, and nervous system. Dr. Wiles is a clinical health psychologist with a passion for helping others reach their full potential from an integrative and holistic perspective. With this strong passion for integrative and holistic care, especially in nutrition and psychophysiology, Dr. Wiles completed his doctor of clinical psychology degree at Regent University with a specialized focus and concentration in health psychology. Dr. Wiles then furthered this specialty in health psychology as a pre-doctoral intern at McGuire VA Medical Center in Richmond, VA and post-doctoral fellowship at WJB Dorn VA Medical Center in Columbia, SC. He currently works as a health psychologist for the Department of Veteran Affairs. With specialized training in health behavior coaching, health assessment, nutritional interventions for mental and physical health, motivational interviewing, applied psychophysiology (biofeedback and neurofeedback) and consultation, Dr. Wiles works as a consultant for companies, organizations, practitioners, and individual patients on nutritional psychology, health behavior change, applied psychophysiology, and health promotion/disease prevention via complementary and integrative practices. He is also board certified in biofeedback and heart rate variability biofeedback as well as board-certified in Tai Chi for rehabilitation. Dr. Wiles has worked closely with elite athletes and executives on enhancing peak performance through his online consulting agency, <a href="http://www.thrive-wellness.com/" target="_blank" rel="noopener noreferrer">Thrive Wellness and Performance</a>. This consulting agency focuses solely on training and regulating psychophysiology for performance. ​He is passionate about education and consultation with patients and organizations in an effort to increase health outcomes through focusing on prevention and well-being, as opposed to disease and symptom mitigation. During this solosode with Dr. Jay, you'll discover: -Jay's background and a brief overview of "biofeedback"...7:16 <ul> <li>Biofeedback: the use of your physiology to enhance self-awareness in order to promote self-regulation</li> <li>Like learning an instrument: perform an action, observe the results, repeat until the desired result has been met</li> <li>HRV is the most fundamental building block of biofeedback</li> <li><a href="http://thrive-wellness.com" target="_blank" rel="noopener noreferrer">Thrive Wellness and Performance website</a></li> <li><a href="http://Drjaywiles.com" target="_blank" rel="noopener noreferrer">Drjaywiles.com</a></li> </ul> -Research on the use of HRV as a metric and HRV Biofeedback...11:43 <ul> <li>Wellness, Performance, Recovery, and Mental Well-being</li> <li>Robust research on HRV began only 20-30 years ago</li> <li>HRV is linked to heart attacks, strokes, physical performance</li> <li>Optimized recovery, sleep, homeostasis of nervous system, and much more...</li> <li>Higher stress (real or perceived) resulted in lower HRV scores</li> <li><a href="https://www.aapb.org/i4a/pages/index.cfm?pageid=1" target="_blank" rel="noopener noreferrer">Association for Applied Psychophysiology and Biofeedback (AAPB)</a></li> </ul> -Overview of Psychophysiology...18:46 <ul> <li>Central Nervous System and Peripheral Nervous System</li> <li>Autonomic Nervous System <ul> <li>Parasympathetic Versus the Sympathetic Response</li> <li>Autonomic Balance</li> </ul> </li> <li>Baroreflex Response <ul> <li>Acetylcholine Response</li> </ul> </li> <li><a href="https://bengreenfieldfitness.com/podcast/hormones-podcasts/what-is-cortisol/" target="_blank" rel="noopener noreferrer">BGF podcast w/ Dr. Koniver on cortisol</a></li> <li>Book: <a href="https://bengreenfieldfitness.com/why-zebras-dont-get-ulcers" target="_blank" rel="noopener noreferrer">Why Zebras Don't Get Ulcers</a> by Robert Sapolsky</li> </ul> -What Is Heart Rate Variability...39:55 <ul> <li>PPG vs. ECG</li> <li>Metric of resiliency to change</li> <li>Sources of HRV <ul> <li>Respiratory Sinus Arrhythmia (RSA)</li> </ul> </li> <li>Autonomic Balance</li> </ul> -Metrics of Heart Rate Variability...49:19 <ul> <li>Defining different domains</li> <li>Time domain <ul> <li>SDNN</li> <li>RMSSD</li> <li>HR Max-HR Min or heart rate amplitude</li> </ul> </li> <li>Frequency Domain <ul> <li>ULF</li> <li>VLF</li> </ul> </li> <li>LF/HF Ratio</li> </ul> -HRV Norms...1:12:00 <ul> <li>Defining Norm-based HRV comparisons</li> <li>High vs. Low HRV</li> <li><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0118308" target="_blank" rel="noopener noreferrer">Voss 2015 Norm Study of Gender and Age</a> <ul> <li>Values for all norms found in 21,000 participants</li> </ul> </li> <li>Norm vs. Individual baseline comparisons</li> </ul> -HRV Training/Regulation...1:23:45 <ul> <li>Resonance Frequency Training <ul> <li>Effortless, low and slow, diaphragmatic breathing</li> <li><a href="https://bengreenfieldfitness.com/podcast/fitness-podcasts/the-oxygen-advantage/" target="_blank" rel="noopener noreferrer">Patrick McKeown</a> style breathing (Book: <a href="https://bengreenfieldfitness.com/oxy-adv" target="_blank" rel="noopener noreferrer">The Oxygen Advantage</a>)</li> </ul> </li> <li>Use of Wearable technology for biofeedback <ul> <li>Pros and Cons</li> </ul> </li> <li>Different Devices: <ul> <li><a href="https://bengreenfieldfitness.com/whoop" target="_blank" rel="noopener noreferrer">Whoop</a> Band</li> <li><a href="https://bengreenfieldfitness.com/whoop" target="_blank" rel="noopener noreferrer">Biostrap</a></li> <li><a href="https://bengreenfieldfitness.com/polarH7" target="_blank" rel="noopener noreferrer">Polar H7 Strap</a> w/ <a href="https://apps.apple.com/us/app/elite-hrv/id868829970?mt=8" target="_blank" rel="noopener noreferrer">Elite HRV</a> or <a href="https://bengreenfieldfitness.com/ben-recommends/software/naturebeat-heart-rate-variability-tracker-hrv-app-for-android/" target="_blank" rel="noopener noreferrer">Nature Beat</a> App</li> </ul> </li> <li>Dr. Wiles’ favorite device: <a href="https://www.getlief.com/order?utm_source=blog&utm_medium=blog&utm_campaign=greenfield&utm_content=GREENFIELD" target="_blank" rel="noopener noreferrer">Lief Therapeutics</a></li> <li>Pitfalls of Wearables <ol> <li>Artifact: Ectopic or false beats</li> <li>Many devices do not remove these in their data inclusion</li> </ol> </li> <li>Book: <a href="https://bengreenfieldfitness.com/oxy-adv" target="_blank" rel="noopener noreferrer">The Oxygen Advantage</a></li> </ul> -HRV Hacks...1:42:00 <ul> <li><a href="https://bengreenfieldfitness.com/article/recovery-articles/how-to-make-your-own-cold-tub-setup/" target="_blank" rel="noopener noreferrer">Cold Exposure</a>: <ul> <li>Hot/Cold Contrast showers</li> <li>Cold Plunges/Immersion</li> </ul> </li> <li>Cold when sleep (core body temp)</li> <li>Exercise</li> <li><a href="https://bengreenfieldfitness.com/article/brain-articles/health-benefits-of-meditation/" target="_blank" rel="noopener noreferrer">Mindfulness and Compassion Exercises</a></li> <li>Dietary Considerations</li> <li>Fasting</li> </ul> -<a href="https://bengreenfieldfitness.com/polyvagaltheory" target="_blank" rel="noopener noreferrer">Stephen Porges' Polyvagal Theory</a>...1:51:09 -And much more... Resources mentioned in this episode: <ul> <li><a href="http://ouraring.com/partners/bengreenfield" target="_blank" rel="noopener noreferrer">Oura Ring</a></li> <li><a href="https://bengreenfieldfitness.com/podcast/hormones-podcasts/what-is-cortisol/" target="_blank" rel="noopener noreferrer">BGF podcast w/ Dr. Koniver on cortisol</a></li> <li>Book: <a href="https://bengreenfieldfitness.com/why-zebras-dont-get-ulcers" target="_blank" rel="noopener noreferrer">Why Zebras Don't Get Ulcers</a> by Robert Sapolsky</li> <li><a href="https://bengreenfieldfitness.com/whoop" target="_blank" rel="noopener noreferrer">Whoop</a> Band</li> <li><a href="https://bengreenfieldfitness.com/whoop" target="_blank" rel="noopener noreferrer">Biostrap</a></li> <li><a href="https://bengreenfieldfitness.com/polarH7" target="_blank" rel="noopener noreferrer">Polar H7 Strap</a> w/ <a href="https://apps.apple.com/us/app/elite-hrv/id868829970?mt=8" target="_blank" rel="noopener noreferrer">Elite HRV</a></li> <li><a href="https://bengreenfieldfitness.com/ben-recommends/software/naturebeat-heart-rate-variability-tracker-hrv-app-for-android/" target="_blank" rel="noopener noreferrer">Nature Beat</a> App</li> <li><a href="https://www.getlief.com/order?utm_source=blog&utm_medium=blog&utm_campaign=greenfield&utm_content=GREENFIELD" target="_blank" rel="noopener noreferrer">Lief Therapeutics</a> (code GREENFIELD for 20% off their first month of subscription or full purchase of the device)</li> <li><a href="https://bengreenfieldfitness.com/oxy-adv" target="_blank" rel="noopener noreferrer">Book: The Oxygen Advantage</a></li> <li><a href="https://bengreenfieldfitness.com/ben-recommends/books/christian-gratitude-journal/" target="_blank" rel="noopener noreferrer">The Christian Gratitude Journal</a></li> <li>Book: <a href="https://bengreenfieldfitness.com/polyvagaltheory" target="_blank" rel="noopener noreferrer">The Polyvagal Theory</a> by Stephen Porges</li> </ul> Episode sponsors: -<a href="https://getkion.com/">Kion Flex</a>: The ultimate recovery formula, Kion Flex is a bioavailable blend to support joint comfort, mobility and flexibility, and bone health. Ben Greenfield Fitness listeners, receive a 20% discount off your entire order at <a href="https://getkion.com/">Kion</a> when you use discount code: BGF20. -<a href="http://x3bar.com/">X3 Bar</a>: Grow muscle 3x faster than you can with free weights! The X3 Bar will change the way you train forever. Get a $50 discount off your X3 bar when you use discount code: BEN -<a href="http://joovv.com/ben">JOOVV</a>: After using the Joovv for close to 2 years, it's the only light therapy device I'd ever recommend. Give it a try: you won't be disappointed. Order using <a href="http://joovv.com/ben">my link</a> and receive my brand new book, Boundless absolutely free! -<a href="http://seed.com/ben">Seed Daily Synbiotic</a>: A formulation of 24 unique strains, each of which included at their clinically verified dose, to deliver systemic benefits in the body. Save 15% off your order when you use discount code: BEN15 Do you have a question for me or Jay about this podcast episode? Leave your thoughts, questions, and feedback below!

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Boundless Life

If you've been a long-time podcast listener, then you're no doubt familiar with Dr. Jay T. Wiles, my jolly sidekick on the regular Ben Greenfield Fitness Q&A podcast episodes. What you may not know about Dr. Wiles is that he is a true expert in...

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