{
  "resourceType": "ActivityDefinition",
  "id": "chin-tuck-with-overpressure",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/chin-tuck-with-overpressure",
  "version": "1",
  "name": "ChinTuckWithOverpressure",
  "title": "Chin Tuck with Overpressure",
  "status": "draft",
  "experimental": true,
  "description": "Sitting tall, place 2 fingers on the chin and gently press the chin straight back (not down) until you feel the back of the neck lengthen. Hold 3 seconds.",
  "useContext": [
    {
      "code": {
        "system": "http://terminology.hl7.org/CodeSystem/usage-context-type",
        "code": "user"
      },
      "valueCodeableConcept": {
        "text": "difficulty: beginner"
      }
    }
  ],
  "topic": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "chin-tuck-with-overpressure",
          "display": "Chin Tuck with Overpressure"
        }
      ]
    }
  ],
  "bodySite": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "cervical-spine",
          "display": "Cervical Spine"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "68818006",
          "display": "Structure of cervical intervertebral disc"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "20292002",
          "display": "Structure of atlantooccipital joint"
        }
      ],
      "text": "Cervical Spine"
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "8 reps × 3-second hold, 1–2×/day."
    }
  ],
  "usage": "Evidence: moderate.",
  "note": [
    {
      "text": "Chin moves straight back, not down — \"double chin\" cue"
    },
    {
      "text": "Stop pressure when the back of the neck lengthens; don't force"
    }
  ],
  "extension": [
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Deep Cervical Flexors"
        },
        {
          "url": "role",
          "valueCode": "primary"
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Suboccipital Muscles"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "244847002"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Semispinalis Capitis"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "2666009"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Splenius Capitis"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "1600003"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Levator Scapulae"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "11327007"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Upper Trapezius"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "31764008"
          }
        }
      ]
    }
  ]
}