{"id": "card_works_heart_rate", "kind": "verified", "title": "A thirty-year-old's maximum heart rate", "body": "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.  [HOLDS; open the seal to re-check.]", "source": {"label": "The Works — worked & sealed", "url": "https://narrowhighway.com/s/b3bd6c87352c2604fe072e52104e074f8eb64294f14c77a929de2e6d65b1a15e", "domain": "exercise_science", "authority_tier": "verified"}, "shelf": "the-works", "box": "earth_life", "bands": ["the-works", "earth_life", "exercise_science", "exercise", "physiology"], "connections": [{"to_card_id": "card_spine_the-works", "relationship": "member_of", "evidence": "a member of the the-works shelf in the keeping"}, {"to_card_id": "card_k_floor_of_discovery", "relationship": "paves", "evidence": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality."}, {"to_card_id": "card_v_e678bd4147fe", "relationship": "demonstrates", "evidence": "A worked demonstration in the same field (exercise_science)."}, {"to_card_id": "card_works_nested_control", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}, {"to_card_id": "card_works_dew_point", "relationship": "adjacent", "evidence": "Neighbouring worked demonstrations in the same part of the volume."}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "subject": "Exercise physiology", "extra": {"seal_hash": "b3bd6c87352c2604fe072e52104e074f8eb64294f14c77a929de2e6d65b1a15e", "cite_url": "https://narrowhighway.com/s/b3bd6c87352c2604fe072e52104e074f8eb64294f14c77a929de2e6d65b1a15e", "demonstration_id": "works_heart_rate", "verdict": "HOLDS"}, "presentation": {"glyph": "•", "kind_label": "earth life", "by": "The Works — worked & sealed", "authority": "verified", "posted": "", "standing": "", "link": {"url": "https://narrowhighway.com/s/b3bd6c87352c2604fe072e52104e074f8eb64294f14c77a929de2e6d65b1a15e", "host": "narrowhighway.com", "provider": "", "titled": "A thirty-year-old's maximum heart rate", "waybill_line": "", "reach": "", "embed": ""}}, "neighbors": [{"id": "card_spine_the-works", "title": "The Works — sealed, worked demonstrations", "relationship": "on the shelf of", "why": "a member of the the-works shelf in the keeping", "href": "/card/card_spine_the-works", "resolved": true}, {"id": "card_k_floor_of_discovery", "title": "The Floor of Discovery — one floor, and by its design the fear of God", "relationship": "paves", "why": "A worked, engine-sealed demonstration — a paving-stone of the floor of reality.", "href": "/card/card_k_floor_of_discovery", "resolved": true}, {"id": "card_v_e678bd4147fe", "title": "HRmax = 208 − 0.7·30 = 187 bpm", "relationship": "demonstrates", "why": "A worked demonstration in the same field (exercise_science).", "href": "/card/card_v_e678bd4147fe", "resolved": true}, {"id": "card_works_nested_control", "title": "The nested control-systems rule: meet a failure at its own layer", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_nested_control", "resolved": true}, {"id": "card_works_dew_point", "title": "When dew forms: the dew point", "relationship": "adjacent", "why": "Neighbouring worked demonstrations in the same part of the volume.", "href": "/card/card_works_dew_point", "resolved": true}]}