{
  "resourceType": "ActivityDefinition",
  "id": "pigeon-stretch",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/pigeon-stretch",
  "version": "1",
  "name": "PigeonStretch",
  "title": "Pigeon Stretch (Modified)",
  "status": "draft",
  "experimental": true,
  "description": "Modified pigeon pose: front leg bent across the body, back leg extended behind. Targets piriformis, obturator internus, gluteus maximus, and posterior hip capsule. Optimized positioning (120° hip flexion, 50° ER, 30° adduction) increases piriformis length by 15.1-15.3% vs conventional stretches.",
  "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": "pigeon-stretch",
          "display": "Pigeon Stretch (Modified)"
        }
      ]
    }
  ],
  "bodySite": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "hip",
          "display": "Hip"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "24136001",
          "display": "Structure of hip joint"
        }
      ],
      "text": "Hip"
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "3×30 seconds per side, daily for 4-6 weeks [Gulledge 2014]"
    }
  ],
  "usage": "Evidence: moderate.",
  "note": [
    {
      "text": "Long trunk — stretch sits in the deep buttock",
      "authorString": "focus:internal"
    },
    {
      "text": "Lower the chest toward the front shin",
      "authorString": "focus:external"
    },
    {
      "text": "Reach the back foot away toward the wall behind",
      "authorString": "focus:external"
    },
    {
      "text": "Both sides of the pelvis stay pressed toward the floor",
      "authorString": "focus:tactile"
    }
  ],
  "relatedArtifact": [
    {
      "type": "citation",
      "label": "kisner-therapeutic-2017",
      "citation": "Kisner C, Colby LA, Borstad J. (2017). Therapeutic Exercise: Foundations and Techniques"
    },
    {
      "type": "citation",
      "label": "acsm-guidelines-2021",
      "citation": "American College of Sports Medicine. (2021). ACSM's Guidelines for Exercise Testing and Prescription",
      "document": {
        "url": "https://doi.org/10.4135/9781412994149.n165"
      }
    }
  ],
  "extension": [
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Piriformis"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "75699001"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Gluteus Maximus"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "206007"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Obturator Internus"
        },
        {
          "url": "role",
          "valueCode": "secondary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "245025008"
          }
        }
      ]
    }
  ]
}