{
  "resourceType": "ActivityDefinition",
  "id": "seated-calf-raise",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/seated-calf-raise",
  "version": "1",
  "name": "SeatedCalfRaise",
  "title": "Seated Calf Raise",
  "status": "draft",
  "experimental": true,
  "description": "Sit upright on a bench or seated calf-raise machine with the knees bent to roughly 90 degrees and the balls of both feet on a raised platform or foot plate, heels hanging free. Rest the resistance (machine pad, dumbbell, or barbell) across the lower thighs just above the knees. Let the heels drop below the platform to feel a stretch through the back of the lower leg, then press through the balls of the feet to raise the heels as high as possible into full plantarflexion. Pause briefly at the top, then lower under control back to the stretched position. Because the knee is held in flexion, the gastrocnemius is shortened and slackened, shifting the workload onto the soleus.",
  "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": "seated-calf-raise",
          "display": "Seated Calf Raise"
        }
      ]
    }
  ],
  "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": "General resistance-training guidance applies: roughly 2-3 sessions per week, about 2-4 sets of 10-20 repetitions with a controlled tempo and full range, progressing load over time. Higher rep ranges are commonly used for the soleus given its slow-twitch composition. Calf-specific dosing evidence is limited, so these are practical, expert-consensus targets rather than exercise-specific trial findings."
    }
  ],
  "usage": "Evidence: expert-opinion. The defining feature of the seated calf raise is knee flexion. The gastrocnemius crosses both the knee and the ankle, so flexing the knee to ~90 degrees shortens and slackens it, reducing its ability to generate force. As a result, surface EMG and biomechanical work consistently show the soleus as the dominant plantarflexor in the knee-flexed (seated) position, whereas the gastrocnemius contributes proportionally more during standing, straight-knee calf raises. The soleus is largely composed of slow-twitch (type I) fibers, which is the common rationale for training it with higher repetitions and longer time under tension. Exact activation percentages vary by study and setup and are not cited here.",
  "note": [
    {
      "text": "Drive the balls of your feet down into the platform and push the floor away to lift your heels as high as they will go."
    },
    {
      "text": "Let the heels sink well below the platform at the bottom for a full stretch, then reach the tallest possible heel position at the top through the full range."
    },
    {
      "text": "Pause and squeeze for a beat at the top, then lower slowly and under control rather than dropping the weight."
    },
    {
      "text": "Keep the knees bent to about 90 degrees and the load stacked over the ankles so the effort stays in the calf, not the thigh."
    }
  ],
  "extension": [
    {
      "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": "Gastrocnemius"
        },
        {
          "url": "role",
          "valueCode": "secondary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "35616000"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Tibialis Posterior"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "74318005"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Flexor Hallucis Longus"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "471000"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Flexor Digitorum Longus"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "18010003"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Peroneus Longus (Fibularis Longus)"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "59831009"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Peroneus Brevis (Fibularis Brevis)"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "60771004"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Plantaris"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "25593008"
          }
        }
      ]
    },
    {
      "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"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Extensor Digitorum Longus"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "20497005"
          }
        }
      ]
    }
  ]
}