{
  "resourceType": "ActivityDefinition",
  "id": "calf-raise-explosive",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/calf-raise-explosive",
  "version": "1",
  "name": "CalfRaiseExplosive",
  "title": "Calf Raise (Explosive Concentric)",
  "status": "draft",
  "experimental": true,
  "description": "Heel raise with a 1-second explosive concentric and 3-second controlled eccentric. Progress to single-leg with load.",
  "useContext": [
    {
      "code": {
        "system": "http://terminology.hl7.org/CodeSystem/usage-context-type",
        "code": "user"
      },
      "valueCodeableConcept": {
        "text": "difficulty: intermediate"
      }
    }
  ],
  "topic": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "calf-raise-explosive",
          "display": "Calf Raise (Explosive Concentric)"
        }
      ]
    }
  ],
  "bodySite": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "ankle",
          "display": "Ankle"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "70258002",
          "display": "Structure of ankle joint"
        }
      ],
      "text": "Ankle"
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "3×12, 3×/week. 70–80% 1RM when loaded."
    }
  ],
  "usage": "Evidence: strong. Progressive resistance at 70–80% 1RM improves gait speed MD=0.13 m/s [Van Abbema 2015].",
  "note": [
    {
      "text": "Triple-quick calf — push fast, lower slow",
      "authorString": "focus:internal"
    },
    {
      "text": "Drive the floor away in one explosive instant",
      "authorString": "focus:external"
    },
    {
      "text": "Lower over three slow seconds back to the floor",
      "authorString": "focus:external"
    },
    {
      "text": "Toes spring like a piano hammer striking a string",
      "authorString": "focus:imagery"
    }
  ],
  "relatedArtifact": [
    {
      "type": "predecessor",
      "label": "Remove tempo/explosive emphasis; perform standard-tempo calf raises focusing on range.",
      "display": "Heel Raise (Calf Raise)",
      "resource": "ActivityDefinition/heel-raise"
    }
  ],
  "extension": [
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Gastrocnemius"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "35616000"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Soleus"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "78376008"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Flexor Hallucis Longus"
        },
        {
          "url": "role",
          "valueCode": "secondary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "471000"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Peroneus Longus (Fibularis Longus)"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "59831009"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Tibialis Anterior"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "73508007"
          }
        }
      ]
    }
  ]
}