{
  "resourceType": "ActivityDefinition",
  "id": "triceps-pushdown",
  "url": "https://bodyiq.dev/fhir/ActivityDefinition/triceps-pushdown",
  "version": "1",
  "name": "TricepsPushdown",
  "title": "Triceps Pushdown",
  "status": "draft",
  "experimental": true,
  "description": "Stand facing a cable column with a straight bar or rope attachment set at upper-chest height. With elbows pinned to your sides and a slight forward hinge at the hips, extend the elbows fully to push the handle down toward the thighs, then control the return until the forearms rise to roughly 90 degrees of elbow flexion without letting the elbows drift forward.",
  "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": "triceps-pushdown",
          "display": "Triceps Pushdown"
        }
      ]
    }
  ],
  "bodySite": [
    {
      "coding": [
        {
          "system": "https://bodyiq.dev/fhir/CodeSystem/exercise",
          "code": "elbow",
          "display": "Elbow"
        },
        {
          "system": "http://snomed.info/sct",
          "code": "44034005",
          "display": "Structure of humeroulnar joint"
        }
      ],
      "text": "Elbow"
    }
  ],
  "kind": "ServiceRequest",
  "dosage": [
    {
      "text": "For strength/hypertrophy in healthy adults, 2-4 sets of 8-15 repetitions at moderate-to-hard effort, 2-3 sessions per week, consistent with general resistance-training guidelines; no pushdown-specific dosing trials exist."
    }
  ],
  "usage": "Evidence: limited. Surface EMG comparisons of common triceps exercises consistently show the pushdown produces high activation of the lateral and medial heads of the triceps brachii, with somewhat lower relative recruitment of the long head because the arm-at-side position keeps the biarticular long head shortened at the shoulder. Training studies comparing arm-at-side versus overhead elbow extension suggest greater long-head hypertrophy when the shoulder is flexed (long head at longer lengths), so the pushdown is best viewed as biased toward the monoarticular heads. Rope attachments allowing terminal wrist spread and full elbow lockout are commonly reported to increase peak activation near end range compared with a fixed straight bar, though differences between attachments are modest.",
  "note": [
    {
      "text": "Pin your elbows to your ribs — only the forearms should move."
    },
    {
      "text": "Push the handle straight down to the floor and pause briefly at full lockout."
    },
    {
      "text": "Keep the chest tall and shoulders down; do not shrug or lean onto the bar as you press."
    },
    {
      "text": "Let the handle rise slowly on the way up, stopping when the forearms reach about parallel to the floor."
    }
  ],
  "extension": [
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Triceps Brachii"
        },
        {
          "url": "role",
          "valueCode": "primary"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "40284004"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Anconeus"
        },
        {
          "url": "role",
          "valueCode": "synergist"
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Posterior Deltoid"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "35259002"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Latissimus Dorsi"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "15665001"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Lower Trapezius"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "31764008"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Rectus Abdominis"
        },
        {
          "url": "role",
          "valueCode": "stabilizer"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "31243008"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Biceps Brachii"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "16225001"
          }
        }
      ]
    },
    {
      "url": "https://bodyiq.dev/fhir/StructureDefinition/muscle-involvement",
      "extension": [
        {
          "url": "muscle",
          "valueString": "Brachialis"
        },
        {
          "url": "role",
          "valueCode": "lengthening"
        },
        {
          "url": "coding",
          "valueCoding": {
            "system": "http://snomed.info/sct",
            "code": "75915005"
          }
        }
      ]
    }
  ]
}