From 60 to 134 HRV: The Habits Behind Peak Human Performance with Dr Kristen Holmes

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