Training Science Podcast The Physiology of Consistency: Why Stable Sleep and HRV Predict Health and Performance, with Dr Greg Grosicki & Prof Paul Laursen
15 snips
Mar 13, 2026 
Dr Greg Grosicki, a human performance researcher at WHOOP focused on HRV, recovery and metabolic health. He explains what HRV really measures and why context matters. They discuss sleep duration and regularity, effects of alcohol, meals and sickness, and a new HRV-CV metric for stability. Big wearable datasets and practical implications for training consistency round out the conversation.
AI Snips
Chapters
Books
Transcript
Episode notes
Seven Day HRV Beats Single Day For Adaptation
- Seven-day rolling HRV predicts training adaptation better than single-day values for long-term decisions.
- Use the 7-day average relative to a 60-day norm to decide if high-intensity work is appropriate, as in HRV-guided training studies.
Late Meals Lower Nighttime HRV
- Nocturnal HRV is sensitive to meal timing and composition; late or energy-dense meals reduce overnight HRV.
- Whoop analyses show moving eating earlier or choosing appropriate pre-bed protein (for night-training athletes) moderates the effect.
Hydrate And Skip Alcohol To Protect HRV
- Track hydration and avoid alcohol to protect HRV; journaling hydration related to small HRV improvements on Whoop data.
- Greg's PLOS digital health study found even modest drinking lowers HRV and self-reported hydration improved nightly HRV.
