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June 3, 2025 70 mins

On this week’s episode of the WHOOP Podcast, WHOOP Global Head of Human Performance Principal Scientist, Dr. Kristen Holmes, sits down with WHOOP Senior Scientist Dr. Bill von Hippel to discuss the science behind stress and sleep and its impact on performance. Dr. Bill von Hippel is a scientist, author, and renowned social psychologist and evolutionary specialist. In today’s episode, Dr. Holmes and Dr. von Hippel discuss cardiac responses to threats and challenges and the core 4 circadian behaviors that help sleep consistency. 

(00:36) Intro to Cardiac Responses and Daily Threats and Challenges

(03:08) Using WHOOP to Conduct Studies

(09:09) Stress Monitor: Understanding Stress vs Challenge

(11:10) Stress + Sleep Data on Shiftworkers

(23:27) Low Fit vs High Fit: Use Case for Strain Coach 

(32:26) Amplifying Effects of Exercise

(37:18) HRV-CV as a Predictor of Strain Load

(43:03) Behaviors That Improve Sleep

(51:06) Core 4: Circadian Behaviors That Help Sleep Consistency

(58:49) The Impacts of Social Jetlag

(01:02:53) Negative Impacts of Oversleeping

(01:07:2) High HRV Indications and HRV Improvements

References:

WHOOP Wear Frequency Study

Shiftwork Biometric Analysis Study

Dr. Bill von Hippel:

LinkedIn

The Social Paradox: Autonomy, Connection, and Why We Need Both to Find Happiness

The Social Leap: The New Evolutionary Science of Who We Are, Where We Come From, and What Makes Us Happy

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