N=1 Reports on marcoaltini.substack.com

N=1 Self-Experiment Data

Sangram Sawant

• Protocol: Low-carb diet (no other changes)
• Before: HRV 65 ms
• After: Spike to 87 ms (days 1–7) then crash to 45 ms by day 8
• Change: −20 ms from baseline by day 8
• Duration: 12 days
• Device: Unspecified

Marco Altini

• Protocol: Low-carb diet phase (after caloric deficit that had improved HRV)
• Before: HRV trending up
• After: Marked HRV drop; RHR unchanged
• Change: HRV suppression; notable decoupling from RHR
• Duration: ~3 wks
• Device: HRV4Training

Marco Altini (full low-carb arc)

• Protocol: Low-carb initially suppresses HRV (weeks 1–4) then re-normalizes by ~week 8
• Before: Low-carb adoption
• After: HRV re-normalized by ~week 8 — consistent with 12-week adaptation literature
• Change: Transient suppression then full adaptation
• Duration: ~8 wks
• Device: HRV4Training