Research / PUBLIC-SAFE SUMMARY

From age and exercise to individual variation

Documented study decisions

Beyond the Beat asks how age and exercise type relate to individual differences in response and recovery. Percentage increase is a response outcome; two-minute BPM recovery is the primary fixed recovery outcome.

Exact age is the main age variable. Four supporting groups guide balanced recruitment and readable charts. The goal is 100 participants, not a prerequisite for descriptive summaries or proof of statistical power.

Each person participates once. This phase uses Apple Watch alone, so it cannot establish repeated-session repeatability or accuracy against a reference device.

Supporting workspace artifacts

Source locations identify the original artifacts in the private project. Raw files are not publicly served. Hashes identify the reviewed source snapshot; they are provenance, not external certification.

• PROJECT.md:50SHA-256 1bf0f269accd1a362f80aa14b5a1ddeb892acad287ea484acfc3a1d662759f00
• docs/study-plan.md:31SHA-256 8917413b5ba1bc1666646352b3cd73c7f9a294e707ed0d1bfeab3c9c17826038