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She more than doubled her HRV in under a decade, and the behaviour that moved it most was not training, supplements or sleep duration, but going to bed and waking at the same time.
This week I sat down with Global Head of Human Performance at WHOOP and author of Aligned, Dr Kristen Holmes, to unpack why sleep-wake consistency is the foundation of a resilient nervous system in midlife.
WHAT YOU WILL LEARN
- Why is sleep-wake consistency a stronger predictor of mortality and disease than how long you sleep?
- How does the contrast between your day and your night affect the severity of menopause symptoms?
- What is the physiological sigh, and why did it outperform other anxiety-reducing techniques in the research?
- Can you really raise your HRV, and how much of it is genetic rather than modifiable?
- Why does eating late at night suppress both sleep quality and overnight recovery?
- Why do unresolved trauma and an outcome-driven identity keep your nervous system stuck in fight or flight?
TIMESTAMPS
00:00 The One Behaviour That Steadies a Midlife Nervous System
09:12 Why Day and Night Contrast Predicts Milder Menopause Symptoms
17:21 The Physiological Sigh, Winter Light and Why Late Meals Wreck Recovery
26:44 Data or Intuition: Using Your Numbers Without Becoming Obsessed
34:54 The Five Habits Behind a Doubled HRV
44:11 Falling Asleep at the Wheel: The Crash That Rebuilt Her Life
52:30 Unresolved Trauma, Fear and an Identity Wrapped Around Outcomes
01:00:53 Living by Your Values When Willpower Runs Out
VALUABLE RESOURCES
Aligned: The Data-driven Guide to Performance, Recovery, and Human Potential by Dr Kristen Holmes: https://www.penguin.co.uk/books/468591/aligned-by-holmes-kristen/9781529146981
Explore Dr Kristen's work: https://drkristenholmes.com/
Track your recovery with WHOOP: https://www.whoop.com/
A BIG thank you to our sponsor who makes the show possible:
• MitoQ - Support your cells at the source with MitoQ NAD+ Dual Action, designed to boost NAD levels and help your cells actually use them for steady energy and sharper focus
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ABOUT THE GUEST
Dr Kristen Holmes is Global Head of Human Performance and Principal Scientist at WHOOP, where she studies how sleep, circadian alignment and recovery shape performance. A former US National Field Hockey Team player and one of the most successful coaches in Ivy League history, she holds a PhD and is the author of Aligned, a data-driven guide to recovery and human potential.
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▶️ Watch Next:
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Angela Foster is a corporate lawyer turned health and performance coach, keynote speaker, and creator of the BioSyncing:registered: Method. Host of the High Performance Health Podcast with 500+ episodes featuring world-leading experts in longevity, hormones, neuroscience, and female performance science.
The most accomplished women have everything handled on the outside, but their hormones, energy, and nervous system are quietly paying the price.
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