Calm the F Down (The Parasympathetic Edge for Performance) | Eric Casaburi & Dr. Scott Sherr
In today’s episode, you’re going to hear a conversation that might completely reframe how you think about stress, recovery, performance, and why so many high achievers quietly burn out.
Joining Eric is Dr. Scott Sherr, a board certified internal medicine physician specializing in hyperbaric therapy, health optimization medicine, and cellular performance. Together, they unpack what Dr. Sherr calls “the parasympathetic edge” — and why living in constant fight or flight mode is slowly eroding your energy, hormones, sleep, and long term health.
This conversation was sparked by a pattern both Eric and Dr. Sherr see every single day: high performing professionals who go hard at the gym, go hard at work, go hard at home — and never downshift. The result isn’t peak performance. It’s nervous system overload.
Dr. Sherr explains why exercise itself is a sympathetic stressor, why gains are made during recovery — not during the workout — and how hustle culture has normalized chronic sympathetic activation. Over time, this creates mitochondrial dysfunction, hormone disruption, inflammation, insomnia, brain fog, and eventually breakdown.
Eric shares real world examples from years in the fitness industry and longevity space, including what happens when enthusiastic gym members overtrain in January and quit six weeks later. They also explore how to measure nervous system balance through heart rate variability, lab testing, metabolomics, and hormone panels.
The conversation then expands into practical recovery strategies, including hyperbaric oxygen therapy, red light therapy, IV support, and targeted supplementation. Dr. Sherr breaks down methylene blue, mitochondrial resilience, altitude stress, and why energy production and oxidative stress must be addressed intelligently within a larger framework.
Most importantly, this episode emphasizes foundation over flash. Advanced therapies are powerful tools — but without balancing the nervous system and optimizing cellular health first, even the best modalities fall short.
This episode is not about doing more. It is about recovering better.
In this episode, you’ll learn:
Why sympathetic dominance quietly destroys long term performance
What “parasympathetic edge” actually means
Why exercise without recovery backfires
How overtraining contributes to burnout
By the end of this episode, you’ll understand why your biggest performance advantage isn’t pushing harder — it’s learning how to downshift faster.
For more resources related to today’s episode, visit:
https://agingbackwardgrowingforward.com/
Learn more about Serotonin Centers:
https://www.serotonincenters.com/
Follow Eric’s Longevity Lab on Instagram:
https://www.instagram.com/ericslongevitylab/
Follow Eric:
Instagram and YouTube: https://www.youtube.com/@EricCasaburi/videos
TikTok: https://www.tiktok.com/@ericcasaburi
Facebook: https://www.facebook.com/profile.php?id=61550518600042
LinkedIn: https://www.linkedin.com/in/ericcasaburi/
Follow Dr. Scott Sherr:
Instagram: https://www.instagram.com/drscottsher r/
YouTube: https://www.youtube.com/@TranscendYourHealth
Website: https://drscottsherr.com/
I am not a licensed physician, and this podcast is not intended as a substitute for the advice of a physician or other qualified healthcare professional. Always consult with a licensed provider regarding your health decisions. I’ll see you in the next episode.
In this episode:
00:00 Why hustle culture is burning people out
02:14 The parasympathetic edge explained
05:03 Why you make gains during recovery, not workouts
07:28 Overtraining and the six week gym dropout pattern
10:02 Measuring nervous system balance with HRV
12:31 Lab testing and metabolomics for optimization
15:10 Recovery modalities that actually work
18:45 Hyperbaric therapy and mitochondrial health
22:07 Methylene blue and cellular energy
27:14 Why foundation matters more than biohacks
33:40 Final lesson: calm down to perform better
