{
  "resourceType": "ActivityDefinition",
  "id": "front-plank",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/front-plank",
  "version": "1",
  "name": "FrontPlank",
  "title": "Front Plank and Variations",
  "status": "draft",
  "experimental": true,
  "description": "Prone forearm plank. RA 46-48% MVIC, EO 77% MVIC with bracing. Scapular adduction + posterior pelvic tilt produces highest overall activation. Adding ankle dorsiflexion increases all abdominals >60% MVIC. Well-tolerated in chronic LBP. Longer holds don't predict lower LBP risk.",
  "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": "front-plank",
          "display": "Front Plank and Variations"
        }
      ]
    }
  ],
  "bodySite": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "lumbar-spine",
          "display": "Lumbar Spine"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "23526008",
          "display": "Structure of lumbar intervertebral disc"
        }
      ],
      "text": "Lumbar Spine"
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "Endurance: 3-4×30-60s. Strength: harder variations 3-4×15-30s. Rehab: 10-20s holds [Calatayud 2019]"
    }
  ],
  "usage": "Evidence: strong. RA 46-48% MVIC. EO 77% with bracing [García-Jaén 2020]. Hollowing: IO ES=2.02-2.27 [García-Jaén 2020]. Scap adduction+PPT: highest overall [Cortell-Tormo 2017]",
  "note": [
    {
      "text": "Long body, packed shoulders — deep core holds the line",
      "authorString": "focus:internal"
    },
    {
      "text": "Drive the forearms into the floor and the heels toward the wall",
      "authorString": "focus:external"
    },
    {
      "text": "Tuck the tailbone toward the back of the knees",
      "authorString": "focus:external"
    },
    {
      "text": "Body stays straight as a plank from crown to heel",
      "authorString": "focus:imagery"
    }
  ],
  "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"
      }
    },
    {
      "type": "successor",
      "label": "3 holds × 45 s with a level pelvis and no lumbar extension",
      "display": "Hollow Body Hold",
      "resource": "ActivityDefinition/hollow-body-hold"
    }
  ],
  "extension": [
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Rectus Abdominis"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "31243008"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "External Oblique"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "1179024003"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Internal Oblique"
        },
        {
          "url": "role",
          "valueCode": "secondary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "1179024003"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Transversus Abdominis"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "86493009"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Erector Spinae Group"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "44947003"
          }
        }
      ]
    }
  ]
}