{"query": "HRmax = 208 − 0.7·30 = 187 bpm", "count": 8, "results": [{"id": "card_v_e678bd4147fe", "title": "HRmax = 208 − 0.7·30 = 187 bpm", "shelf": "exercise_science", "surface": "secular", "snippet": "Verdict: HOLDS.\n• exercise_science.max_heart_rate: HRmax = 208 - 0.7·30.0 = 187.0 bpm (matches claim 187.0, diff 0.0 ≤ 2.0)\nSealed and independently re-checkable: https://narrowhighway.com/s/b3bd6c873", "authority_tier": "engine", "source": "Verified by the engine — exercise_science", "readable": false, "generated": false}, {"id": "card_works_heart_rate", "title": "A thirty-year-old's maximum heart rate", "shelf": "the-works", "surface": "secular", "snippet": "The Tanaka formula estimates maximum heart rate as 208 − 0.7·age — 187 bpm at thirty, the modern refinement of the old 220 − age rule.  Worked & sealed by the engine — HRmax = 208 − 0.7·30 = 187 bpm. ", "authority_tier": "verified", "source": "The Works — worked & sealed", "readable": false, "generated": false}, {"id": "card_domchk_exercise_science_claimed_max_hr", "title": "Exercise Science: max hr", "shelf": "exercise_science", "surface": "secular", "snippet": "A worked check in exercise science: max hr.\n\nGIVEN\n  age_years = 30\n  intensity_high = 0.7\n  tolerance_bpm = 1\n\nCLAIMED\n  claimed_max_hr = 187\n\nTHE ENGINE'S VERDICT\n  exercise_science.max_heart_rate: ", "authority_tier": "reference", "source": "The verifier's own documented relation, and a run this engine performed against it (deterministic; re-runnable with tools/domain_goldens.py)", "readable": false, "generated": false}, {"id": "card_seal_9ec02423f1d66f78d42b566581d15f12f8f04279dbaeae1b13c6832d951fc2ce", "title": "Receipt 9ec02423f1d6… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"exercise_science\",\n  \"dimensions\": [\n   \"conservation_balance\",\n   \"metabolism\",\n   \"physical_substance\",\n   \"reasoning\",\n   \"time_sequence\"\n  ],\n  \"umbr", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_seal_ef69dc5f0007cb22a3dde6e1648d0c6ffc3e130030a72a1eb6968af039d315cd", "title": "Receipt ef69dc5f0007… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"exercise_science\",\n  \"dimensions\": [\n   \"conservation_balance\",\n   \"metabolism\",\n   \"physical_substance\",\n   \"reasoning\",\n   \"time_sequence\"\n  ],\n  \"umbr", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_seal_eb8066bf8cb86f7e81cece793f88e6929f377d0fdd76ffb32db7f7f2c3fac2ee", "title": "Receipt eb8066bf8cb8… — sealed: record", "shelf": "seals", "surface": "secular", "snippet": "{\n \"anchors\": [],\n \"axis_coords\": {\n  \"axis\": \"exercise_science\",\n  \"dimensions\": [\n   \"conservation_balance\",\n   \"metabolism\",\n   \"physical_substance\",\n   \"reasoning\",\n   \"time_sequence\"\n  ],\n  \"umbr", "authority_tier": "engine_derived", "source": "Narrow Highway engine — sealed record", "readable": false, "generated": false}, {"id": "card_calc_v_exercise_science_max_heart_rate", "title": "Max heart rate", "shelf": "calculations", "surface": "secular", "snippet": "Max heart rate — exercise_science. Formula: HRmax = 208 - 0.7 age. Canonical FORM: linear_map (y = a + b x) — engine verifier exercise_science.max_heart_rate — the deterministic check the concordance ", "authority_tier": "reference", "source": "The Calculation Map — every calculation, mapped by form", "readable": false, "generated": false}, {"id": "card_calc_v_exercise_science_target_heart_rate_zone", "title": "Target heart rate zone", "shelf": "calculations", "surface": "secular", "snippet": "Target heart rate zone — exercise_science. Formula: target = (HRmax-HRrest) I + HRrest. Canonical FORM: linear_map (y = a + b x) — engine verifier exercise_science.target_heart_rate_zone — the determi", "authority_tier": "reference", "source": "The Calculation Map — every calculation, mapped by form", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_v_e678bd4147fe"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}