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WHOOP

4.0 · 5.0 · MG — Strain, Recovery & Protocol KPIs

WHOOP is a physiological monitoring platform built for athletes and health optimizers. It tracks Strain (cardiovascular load, 0–21), Recovery (0–100%), HRV, sleep stages, and more. Devices include WHOOP 4.0, 5.0, and the medical-grade WHOOP MG (2025).

Key metrics for peptide protocols

  • Strain — Daily cardiovascular load (0–21). Pair with Recovery to balance training and rest.
  • Recovery % — Composite from HRV, resting HR, sleep. Target 75%+ on injection days for GH secretagogues.
  • HRV (rmssd) — Nightly. Use with Recovery for tissue-repair peptides (BPC-157, TB-500).
  • Slow wave sleep — WHOOP’s deep sleep metric. Critical for CJC-1295 / Ipamorelin optimization.

Devices

  • WHOOP 4.0 — Legacy; 4–5 day battery.
  • WHOOP 5.0 — 14+ day battery; WHOOP Age, Health Monitor, Stress Monitor.
  • WHOOP MG — Medical-grade (2025); ECG, AFib, blood pressure insights, FDA-cleared.
Full WHOOP reference (PDF-style)WHOOP Developer Portal →

Peptide Resource Hub | WHOOP data collection, API & integration reference